Showing papers on "Beam (nautical) published in 2014"

Selection of Main Dimensions and Calculation of Basic Ship Design Values

Abstract: This chapter deals with the determination of the main ship dimensions (length, beam, draft, side depth), following the estimation of ship’s displacement and the selection of other basic ship design quantities and hull form characteristics (hull form coefficients, powering, weight components, stability and trim, freeboard, load line), as required in the first phase of ship design, that is, the Concept Design. The various effects of specific selections of ship’s main dimensions etc. on the ship’s hydrodynamic performance, stability and trim, structural weight and construction cost, utilization of spaces, and transport economy are elaborated. The selection procedure is supported by statistical data and empirical design formulas, design tables and diagrams allowing direct applications to individual ship designs. Additional reference material is given in Appendix A.

Method for determining local strength of bottom structure of ship launched from berth

Abstract: The invention discloses a method for determining the local strength of a bottom structure of a ship launched from a berth. The method is characterized by comprising steps of firstly, simplifying the integral structure of the ship into a variable-cross-section thin-walled beam along the length direction of the ship, perpendicularly flexibly supporting buttresses, selecting a series of gliding positions as working conditions when the ship glides along the berth, acquiring values of buttress reaction force born by the ship structure corresponding to the various buttresses, and determining various stress extreme positions of the structure; secondly, analyzing the strength of the structure corresponding to the stress extreme positions by the aid of a local three-dimensional finite element model, and determining the structural strength of various regions. The method has the advantages that integral ship beam computation is combined with a local three-dimensional finite element model analysis process, so that modeling workload can be greatly reduced as compared with a whole-ship three-dimensional structural finite element modeling analysis process in the prior art, the computation time can be saved, and the analysis speed can be increased.

Bridge displacement and expansion joint width remote-measuring system based on internet of things and lasers

Abstract: A bridge displacement and expansion joint width remote-measuring system based on the internet of things and lasers comprises a plurality of beam bodies which are laid on bridge piers, and an expansion joint is arranged between the end faces of every two adjacent beam bodies. The bridge displacement and expansion joint width remote-measuring system is characterized in that a fixed frame is arranged on the bridge piers and located outside the beam bodies in an expansion joint span range, and two laser distance measuring devices are arranged on the fixed frame; every two adjacent beam bodies are respectively provided with a laser reflection target, and the two laser distance measuring devices can be used for measuring the distances between the laser reflection targets on two sides and the fixed frame respectively. The bridge displacement and expansion joint width remote-measuring system has the advantages that a brand-new method is provided for measuring beam-body displacement and expansion-joint displacement, and correlation measurement data can be obtained efficiently in real time; compared with the prior art, a measurement process is more convenient, cost is lower, and measurement results are more accurate.

Bridge type grab bucket ship unloading machine

Abstract: The utility model discloses a bridge type grab bucket ship unloading machine. The bridge type grab bucket ship unloading machine comprises a steel structure system, an operating system and an unloading system, wherein the steel structure system comprises a door frame structure, a rear crossbeam, a front crossbeam and a pull rod system; the door frame structure comprises a seaside stand column, a seaside lower transverse beam, a seaside upper transverse beam, a landside stand column, a landside lower transverse beam, a landside upper transverse beam, a trapezoidal frame, a connection beam and a diagonal bracing; the operating system comprises a walking mechanism, a lifter, opening and closing trolley operating mechanism and a pitching mechanism; the walking mechanism is connected with the door frame structure; the unloading system comprises a material accepting plate system, hoppers and a feeding belt conveyor; the pull rod system comprises a front pull rod, a middle pull rod and a rear pull rod. The bridge type grab bucket ship unloading machine has the advantages that the working efficiency is high and the output is maximized; the outreach distance of seaside and landside is great and a three-pull-rod manner is adopted, so that the requirements of wharf berthing of large ships and the bidirectional discharging of the seaside and the landside can be met; the double-hopper discharging efficiency is high.

Ship structure impact experiment boundary condition simulation device

Abstract: The invention provides a ship structure impact experiment boundary condition simulation device. The ship structure impact experiment boundary condition simulation device comprises two horizontal flat plates and two vertical flat plates. The horizontal flat plates are connected with the vertical flat plates through triangular supporting plates to form two right-angle L-shaped frames respectively, a boundary steel fixing plate is arranged at the center of the inner side of each vertical flat plate, tools used for fixing experiment components are arranged on the boundary steel fixing plates and the two ends of an experiment beam model are fixed between the two right-angle L-shaped frames respectively. The principle that when a steel plate moves in the plate face normal direction in water, huge added mass is generated, the added mass generated through the structure is used for replacing the boundary constraint borne by the model, and added inertia force and torque of the rigid fixing boundary can be obtained. By means of the ship structure impact experiment boundary condition simulation device, the boundary conditions of rigid fixing at the two ends of the model can be well simulated. The ship structure impact experiment boundary condition simulation device further has the advantages of being simple in structure, convenient to machine and assemble and capable of bringing convenience to quality control.

Effect of Overlap Stress as Well as Tie Beam Length and Width on Settlement of Isolated Footings Using Finite Element

Abstract: Effects of tie beam length, width and overlap stress on settlement of foundations have been investigated. In this investigation square concrete footings have been used with dimensions (B × B × d) where (d) is footing depth and (B) is footing width (1, 1.5,2 m). Width of tie beam (b) has been taken equal to 0.25, 0.30, 0.40, 0.50 and 0.75 (m). Tie beam length (L) has been taken varying from B till 3B with same footing depth = 0.50 m. Effect of overlap stress on settlement as well as effect of tie beam width and length on settlement has been determined. Also, the efficiency of tie beam length and width has been obtained. An equation is presented to compute the overlap stress zone in case of existing tie beam. It is found that the settlement increases with increasing the length of tie beam which is clear after the effect of the overlap stresses zone. The width of overlap stress zone case of existing tie beam has been found to be equal to (1.6 -1.75) B. The settlement of footings decreases with increasing tie beam width. It is found that the settlement after the effect of the overlap stress zone increases with increasing the length of tie beam.

Mounting device for inward-crawling type tower crane bearing beam and inward-crawling type tower crane

Abstract: The utility model discloses a mounting device for an inward-crawling type tower crane bearing beam. The mounting device comprises a bearing beam, and two brackets arranged at the two ends of the bearing beam respectively, wherein an adjustable propping device is arranged on each bracket and on at least one side of the bearing beam respectively; the propping device of each bracket performs positioning and locking on the bearing beam from the lateral direction of the bearing beam at each end of the bearing beam. The utility model further provides an inward-crawling type tower crane adopting the mounting device for the inward-crawling type tower crane bearing beam. According to the utility model, the mounting device is reasonable in structure, simple to operate, safe and reliable, low in cost and can be reutilized, the problem that high-strength bolts are not easy to mount during the mounting process of the bearing beam of the conventional inward-crawling type tower crane is solved, and the procedure of the on-site reprocessing of bolt holes among the brackets and the bearing beam is avoided, so that the mounting, positioning and operation of the bearing beam are simpler and more convenient, and time for mounting and dismounting is saved.

Experimental Study of the Wharf Structure Influence on Ship Mooring Conditions

Abstract: Through the overall physical model, the pier and beam slab wharf structure and big platform wharf structure influence on ship mooring conditions are tested. The results show that different wharf structure has certain influence on ship movement, mooring force and impact force. Due to the middle void space of pier and beam slab can buffer the wharf apron water action on the ship, which is good for improving ship mooring conditions, the pier and beam slab structure is proposed for the project.

Wharf building crane

Abstract: The utility model discloses a wharf building crane. The wharf building crane comprises a bearing beam, at least two flatcar walking, crown block assemblies, a first main beam, a second main beam, a bottom walking device and a supporting seat, wherein the lower end of the supporting seat is connected with the bottom walking device; the bottom walking device is arranged on the bearing beam; the bearing beam is connected with the first maim beam by the supporting seat; the bearing beam is provided with the flatcar walking assembly; the flatcar walking assembly is provided with the second main beam and is vertical to the first main beam; a guide rail of the second main beam is provided with the crown block assembly. According to the wharf building crane, the match of a crane and a floating crane boat is not needed, and the double-line rail walking of the bearing beam is carried out and a flatcar cantilever automatically spans a paved rail so that the erection of wharf components is realized automatically; the erection of prefabricated components of a wharf can be finished safely and rapidly; the wharf building crane is suitable for being used for erecting the middle-span and long-span wharf components.

Suspension-type high-speed width-regulation hydraulic turnover plow and stepless width regulation device thereof

Abstract: Disclosed are a suspension-type high-speed width-regulation hydraulic turnover plow and a stepless width regulation device thereof The suspension-type high-speed width-regulation hydraulic turnover plow comprises a suspension support, a turnover device, plow bodies and a stepless width regulation device body The turnover device comprises a turnover cylinder and a turnover support, and the turnover cylinder is hinged to the suspension support and the turnover support respectively The stepless width regulation device body comprises a width regulation cylinder, a width regulation bar and a parallel four-bar mechanism The parallel four-bar mechanism comprises a main beam, a width regulation beam and at least two clamping seats, the main beam and the width regulation beam are parallelly arranged, and two ends of each clamping seats are respectively hinged to the main beam and the width regulation beam One end of the width regulation cylinder is hinged to the main beam, one end of the width regulation bar is hinged to the width regulation beam, the other end of the width regulation cylinder and the other end of the width regulation bar are respectively hinged to the turnover support, and the plow bodies are disposed on the clamping seats The suspension-type high-speed width-regulation hydraulic turnover plow is applicable to high-speed operation, small in resistance and good in soil turning over and covering

Ship with adjustable beam

Abstract: The utility model discloses a ship with an adjustable beam. The ship comprises a ship body, beam adjusting mechanisms used for changing the beam are respectively arranged on two sides of the body, and the beam adjusting mechanism comprises turning plates, support rods, first containing cabins and drive devices. The turning plates are hinged to lateral edges of a deck of the ship body, the first containing cabins are arranged in a double-deck hull at sides of the ship body, and the drive devices are mounted in the first containing cabins. One end of the support rods is supported on the turning plates, the other end of the support rods is hinged in the first containing cabins, and middle parts of the support rods are hinged with drive ends of the drive devices. Due to the technical scheme that the beam adjusting mechanisms are respectively arranged on the two sides of the ship body additionally, ship beam is adjustable, and a purpose of free navigation on multiple water areas is achieved, and the ship with the adjustable beam is applicable to the field of ships.

Ship loading/unloading machine

Abstract: The utility model discloses a ship loading/unloading machine. The ship loading/unloading machine is provided with a bearing platform, rails, a trolley travelling mechanism, a horizontal projection part and two anti-roll bars; two rails are arranged on the bearing platform in parallel and fixedly; the trolley travelling mechanism comprises a main equalizing beam and a plurality of travelling wheels, and the plurality of travelling wheels are rotatably connected with the equalizing beam; the first ends of the anti-roll bars are fixedly connected with the main equalizing beam, and hooks are arranged at the second ends of the anti-roll bars; the horizontal projection part is fixedly arranged in the length direction of the rails, and the hooks are propped against the bottom surface of the horizontal projection part and capable of sliding relatively to the horizontal projection part. When the ship loading/unloading machine trends to tilting in a direction perpendicular to the rails, the horizontal projection part is tightened by the hooks of the anti-roll bars, and then the ship loading/unloading machine is prevented from tilting or further tilting. As a result, compared with the prior art, the anti-tilting capacity of the ship loading/unloading machine is higher.

Movable double-end bag ship loader with crane

Abstract: The utility model relates to a movable double-end bag ship loader with a crane. The ship loader is installed in a workshop with a ceiling and comprises the twin beam overhead crane (1), the twin beam overhead crane (1) is transversely installed on a rail of a wall, and two sets of bag ship loader bodies are arranged on the twin beam overhead crane (1). The ship loader comprises the twin beam overhead crane (1), a movable trolley (2), a belt conveyor feeding system (3), an arm bracket (4), an arm bracket belt conveyor (5), a spiral chute (6), a rotary distributing machine (7) and an arm frame pitching mechanism (8), the twin beam overhead crane (1) can move in the direction of a wharf, the movable trolley (2) can move in the direction perpendicular to the wharf, the operation range of the ship loader is widened, a ship does not need to move, the position of the ship loader does not need to be adjusted, and operation efficiency is greatly improved. The ship loader cannot be influenced by rainy or snowy weather, all-weather 24-hour operating is achieved, workers are reduced, labor intensity is relieved, and ship loading can be finished after the ship is barged once.

Method and device for directly measuring track center line

Abstract: The invention discloses a method and device for directly measuring a track center line. A trolley prism optical center is placed on a midpoint of a connecting line between the walking wheel lower generatrix of a left wheel train and the walking wheel lower generatrix of a right wheel train of a track measuring instrument, the left wheel train and the right wheel train of the track measuring instrument automatically and forcefully center the center of a trolley prism with a track acting edge as a standard to enable the midpoint of the connecting line to coincide with the track center point. The device comprises a measuring beam, a connecting shaft and an auxiliary beam. The measuring beam is connected with the auxiliary beam through the connecting shaft, a left side beam of the measuring beam is connected with a right side beam through an automatic forced centering device, the lower end of the outer side of the left side beam is provided with the left wheel train, the lower end of the outer side of the right side beam is provided with the right wheel train, the automatic forced centering device is located at the center line position of the measuring beam, and the auxiliary beam and the measuring beam are the same in structure. According to the method and device, the measured error links are reduced to be minimum, the precision of the track center line measuring only depends on a total station and is not affected by parameters such as track gauges, level, gradient, azimuth angle, and the method is an effective measuring method for automatically, continuously and directly measuring the track center line in a high-precision mode.

Chassis of railway flat wagon

Abstract: The invention relates to a chassis of a railway flat wagon. In a current railway flat wagon chassis, bearing surfaces of the ends and the middle part are equal in height, so that the distance between the bearing surface of the flat wagon and a rail surface is large; when the flat wagon is used in occasions in which goods need to be loaded and unloaded frequently, the goods are loaded and unloaded inconveniently; measures need to be taken to reduce the distance between the bearing surface of the middle part of the flat wagon chassis and the rail surface. The chassis of the railway flat wagon comprises an end dragging beam (1), wherein the end dragging beam (1) is connected to a middle bearing beam (4) through a sleeper beam (2); the sleeper beam (2) is connected to a side bearing beam (5); a support beam (7) is arranged between the sleeper beam (2) and a transverse connection beam (3); the middle bearing beam (4) is connected to the side bearing beam (5) through a floor board (9); an end beam (8) is connected to the sleeper beam (2), the side bearing beam (5) and the end dragging beam (1). The chassis of the railway flat wagon is applicable to the railway flat wagon.

Track beam erecting device

Abstract: The utility model discloses a track beam erecting device, belongs to the technical field of overhead and bridge construction, and aims to solve the problem of poor positioning accuracy in track beam hoisting. The track beam erecting device comprises a first upper frame arranged at the end part of a track beam mounted in place and a second upper frame arranged at the end part of a to be mounted track beam, wherein the second upper frame is butted with the first upper frame; the second upper frame is pulled by a hydraulic jack of the first upper frame to move in the direction away from the first upper frame, so as to drive the to be mounted track beam to move in the direction away from the track beam mounted in place; when the to be mounted track beam is hoisted and a lifting hook is not completely loosened, the to be mounted track beam is hoisted to the position away from the track beam mounted in place to keep a distance which is greater than or equal to 30 mm and less than 50 mm; and then the second upper frame is pulled by the hydraulic jack to move in the direction away from the first upper frame, so as to drive the to be mounted track beam to move synchronously; the horizontal space d between the first upper frame and the second upper frame is expended to 50 mm. According to the track beam erecting device, the mounting positioning accuracy is high, the operation is convenient, the structure is simple and the manufacturing cost is low.

Stretching adjusting device of steel wire rope for connecting vertical ship lifter balance weight

Abstract: The utility model relates to a stretching adjusting device of a steel wire rope for connecting vertical ship lifter balance weight. An outer supporting beam group is arranged above the outer side of an inner supporting beam group fixedly assembled together with the steel wire rope; the outer supporting beam group is fixedly assembled together with the steel wire rope; one end of each of two connecting plates is fixedly connected with the outer supporting beam group; the other end of each of the two connecting plates is fixedly connected with a ship reception chamber; and a jack is mounted between the inner supporting beam group and the outer supporting beam group. According to the stretching adjusting device provided by the utility model, various technical difficulties in stretching adjusting construction of the steel wire rope are overcome. The stretching adjusting device provided by the utility model is simple and compact in structure as well as safe, reliable and convenient for construction, and can meet the requirement of stretching adjustment between the balance weight and the steel wire rope of the vertical ship lifter.

Marine box beam connecting structure

Abstract: The utility model belongs to the field of hull structure designing of ship engineering, and particularly relates to a marine box beam connecting structure. The connecting structure comprises a box beam wall plate, a box beam bottom plate, connecting structure webs and connecting structure panels. The box beam wall plate, a main hull deck, the box beam bottom plate and a main hull exterior plate form a box structure. The two connecting structure webs are divided into straight segments and arc-shaped segments. The straight segments are welded to the box beam wall plate and the box beam bottom plate respectively. The arc-shaped segments are connected with a main hull beam web and a main hull rib web respectively. The two connecting structure panels are welded to the arc-shaped segments of the connecting structure webs respectively and connected together with a main hull beam panel and a main hull rib panel respectively. A main hull and a box beam are firmly connected through the connecting structure; in addition, neither the main hull nor the box beam will have stress concentration points, and stress distribution is uniform.

Method of launching laser beam-guided rocket

Abstract: FIELD: weapons and ammunition.SUBSTANCE: proposed method comprises target ranging and input of measured magnitude to surface control system. Beam axis initial elevation Yis set relative to target point direction to launch the guided missile. Beam axis maximum elevation Yis set relative to target point direction. Missile flies at maximum elevation till the time set at surface control system in compliance with measured range to target, beam axis being aligned with target point direction. Note here that the elevation is serially changed in time interval from rocket launch moment to momentwhere ?is missile control system frequency cut-off, rad/s while initial elevation Yis kept variable. Note here that its magnitude is set by relationshipwhereis minimum possible vertical deviation of the missile from target point direction at this flight path section, m; Ris beam radius, m, while during period from moment tto momentwhere Vis the maximum tolerable beam elevation rate, m/s, elevation is increased to Y.EFFECT: higher accuracy of fire.2 dwg

Rail transfer type double-vertical screw ship unloader

Abstract: A rail transfer type double-vertical screw ship unloader comprises a movable base, a fixed seat, a slewing tower and a screw conveyer. The fixed seat is installed on the movable base, the bottom of the slewing tower is installed on the fixed base through a main slewing bearing, a horizontal beam is supported by the slewing tower, a beam top in the front of the horizontal beam bears a horizontal screw, a balance weight is arranged at the rear of the horizontal beam, the front end of the horizontal screw is hinged to a double-vertical screw, the lower end of the double-vertical screw is hinged to and clamped with a material fetching head. The rail transfer type double-vertical-screw ship unloader has the advantages that the structure is stressed in a balanced and symmetrical mode and reasonable, materials are conveyed smoothly, the appearance is attractive, and reliability is high.

Scale beam variable amplitude type rotary tower spiral ship unloader

Abstract: The utility model relates to a scale beam variable amplitude type rotary tower spiral ship unloader which comprises a fixed seat, a rotary tower, a balance weight beam, a horizontal spiral conveyor, perpendicular spiral conveyers and a material fetching head. The bottom of the rotary tower is mounted on the fixed base through a main slewing bearing, the middle of the balance weight beam is mounted at the upper end of the rotary tower through a half type slewing bearing, a feeding device with a hinge seat is arranged on the bottom of the rotary tower, and the feeding device is communicated with a discharging device. The horizontal spiral conveyor is mounted on a supporting beam, the discharging end of the horizontal spiral conveyor is hinged to the feeding device, the feeding end of the horizontal spiral conveyor is hinged to the upper ends of the two abreast perpendicular spiral conveyors through second hollow slewing bearings, the perpendicular spiral conveyors are bound and fixed to a perpendicular bracket, the upper end of the material fetching head is hinged to the bottom ends of the perpendicular spiral conveyors through hollow toothed slewing bearings, and the material fetching head is driven by a transmission device. The scale beam variable amplitude type rotary tower spiral ship unloader is simple in structure, even in stress, stable in operation and more direct and smoother in material conveying.

Exoskeleton ship hull structure

Abstract: A vessel comprising a hull having a length, a main deck located above and rigidly connected to the hull and at least one beam extending substantially along the length of the hull at a position spaced above the deck, wherein the beam is rigidly connected to and longitudinally reinforces the deck and the hull.

Special nickel ore grab bucket for grabbing machine

Abstract: The invention relates to a special nickel ore grab bucket for a grabbing machine. The special nickel ore grab bucket comprises two bucket bodies which are symmetrically arranged left and right, and is characterized in that each bucket body comprises a bucket bottom plate and a bucket side plate; the bucket bodies are respectively in a U shape; the surfaces of the inner walls of the bucket bodies are flat and are not provided with a rib plate; the upper ends of the two bucket bodies are connected with a bearing beam by pin shafts; the upper end of the bearing beam is fixedly connected with a head lifting lug; the head lifting lug is connected with an upper bearing beam by a pin shaft; two oil cylinders are symmetrically arranged left and right and are respectively arranged behind the two bucket bodies; one ends of the oil cylinders are articulated with the bearing beam, and the other ends of the oil cylinders are articulated with the bucket bodies. The special nickel ore grab bucket is simple, compact and reasonable in structure, can be used for grabbing nickel ore without sticking material, enables the nickel ore not to be scattered and leaked, greatly improves the working efficiency and the safety of nickel ore grabbing, and is wide in use.

Device for linking dock gate with anti-collision beam

Abstract: The utility model relates to a device for linking a dock gate with an anti-collision beam The device comprises an anti-collision beam, guide rails, a first horizontal pulley, a second horizontal pulley, a ship tank, a vertical pulley, a steel wire rope, an oil cylinder and a dock gate, wherein one end of the steel wire rope is connected with the anti-collision beam; the other end of the steel wire rope sequentially bypasses the first horizontal pulley, the second horizontal pulley and the vertical pulley and is connected with the dock gate; two ends of the anti-collision beam are respectively mounted in the guide rails on two sides of the ship tank; the bottom of the dock gate is hinged with the ship tank; one end of the oil cylinder is hinged with the ship tank, and the other end of the oil cylinder is hinged with the dock gate; the first horizontal pulley, the second horizontal pulley and the vertical pulley are fixed pulleys The dock gate and the anti-collision beam of the device can be synchronously opened to drop and closed to rise; the dock gate and the anti-collision beam are connected by using the steel wire rope; by adopting the fixed pulleys, the direction of the force is changed, thus the purpose of linkage is achieved; the device is simple and reasonable in structure, stable, safe and reliable to operate, convenient to mount and maintain and excellent in popularization and application values

Rail movement type double-vertical spiral ship unloader

Abstract: A rail movement type double-vertical spiral ship unloader comprises a moving base, a fixed base, a rotation tower and a spiral conveyor. The fixed base is installed on the moving base, the bottom of the rotation tower is installed on the fixed base through a main slewing bearing, a horizontal beam is supported by the rotation tower, the top of the beam part in the front of the horizontal beam supports a horizontal spiral, the back of the horizontal beam is provided with a balance weight, a double-vertical spiral is hinged to the front end of the horizontal spiral, and a material taking head is hinged and clamped to the lower end of the double-vertical spiral. According to the device, the structure is stressed in a balanced mode, symmetric and reasonable, materials are conveyed smoothly, the appearance is attractive, and the unloader has high reliability.

Dry bulk goods container

Abstract: The utility model provides a dry bulk goods container which comprises a bottom portion (1), two side portions (2) and unloading openings (3). The bottom portion is provided with a first protruding structure (4), and the unloading openings (3) are formed in the side portions (2) close to the bottom of the first protruding structure (4). The unloading openings (3) are provided with first unloading doors (8), the side portions (2) are provided with a bottom beam (9), and the bottoms of the first unloading doors (8) are hinged to the bottom beam (9). The dry bulk goods container is simple to operate, can achieve complete unloading, and saves unloading time. By means of the design of the two doors, unloading speed can be adjusted at any time, so that safety of operators is guaranteed. An unloading channel is formed after an outer door is opened, so that unloading is more convenient to achieve, and applicability is better.

Control method for connecting rod type horizontal plane planar motion mechanism

Abstract: The invention discloses a control method for a connecting rod type horizontal plane planar motion mechanism, and relates to ship model test equipment and a control method of the ship model test equipment, in particular to the control method of the planar motion mechanism used for measuring the motion performance of a ship model. The control method comprises the following steps: a control parameter table is established according to motion trails of yawing motion and swaying motion of the ship model; a resetting operation is conducted; a ship model motion pattern is selected; the control parameter table is read to obtain control parameters; a pulse time sequence table is generated according to the control parameters; a pulse sequence is sent according to the pulse time sequence table; a cross beam is driven to move along a predetermined motion trail; a position sensor arranged in an electric cylinder is used for sampling, the actual position of the cross beam is calculated, and the ship model is controlled to conduct yawing motion or swaying motion. According to the control method, the accurate positioning control function of a PLC host computer is utilized, the same control device is used for controlling the same motion component, accurate control over the swaying motion and the yawing motion of the planar motion mechanism is realized, and the frequency and amplitude of the yawing motion or the swaying motion of the ship model can be set and adjusted flexibly.

Detachable wind turbine blade

Abstract: The utility model discloses a detachable wind turbine blade which comprises a blade framework structure and covers, and is characterized in that the covers are flexible covers; the blade framework structure comprises at least two sizing wing plates which are arranged in the folding direction of the blade at an interval, and main bearing beam caps, a leading edge bearing beam and a trailing edge bearing beam which are arranged on the sizing wing plates; the main bearing beam caps are arranged at upper slotted positions and lower slotted positions of the sizing wing plates of the blade; at least one main bearing beam cap is arranged on each of the force suction surface and the pressure surface of the blade; the leading edge bearing beam is assembled at a leading edge bearing beam perforation position in the sizing wing plates of the blade; the trailing edge bearing beam is assembled at a trailing edge bearing beam perforation position in the sizing wing plates of the blade; the covers are connected to the sizing wing plates through suspension ropes in a tensioned manner. The detachable wind turbine blade is high in structure efficiency and easy to maintain and has a wide application prospect and higher structural designability.

Stress balance coupling structure for beam to column connection

Abstract: The present invention relates to a stress-balance type column-beam combined structure. When rotational behavior is caused by earth quake, stress concentrated on a column-beam combined part having a concern about brittle fracture is evenly distributed to other points of the middle part of the beam, so that the stress-balance type column-beam combined structure can reduce damage to a beam, generally increase deformation capacity, and easily ensure strength. The stress-balance type column-beam combined structure comprises a column, a beam, and a reinforcing rib, wherein the reinforcing rib includes: a first straight line part which extends from a rear end coupled to a side of the column and maintains a predetermined width; a curved line cut part which extends from the tip end of the first straight part and has a constricted curve-shape whose width gradually becomes narrow and wide; a second straight line part which extends from the tip end of the curved line cut part and maintains the predetermined width; and an inclined part which extends from the tip end of the second straight line part and has a straight line that whose width gradually becomes narrow. The length (d_b) of the curved cut part, the width (b_a) of the narrowest part of the curved cut part, and the distance (a) between the rear end part of the reinforced rib and the narrowest part of the curved cut part is determined by the below formula. d_b≒(0.5~0.7)h, b_a≒(1~1.5)t_f, a≒(0.95~1.15){L/2-(L/2-d)(M_ap-M_p)}.