Showing papers on "Beam (nautical) published in 2015"

Comparison of three simple models of Kelvin’s ship wake

Abstract: A theoretical explanation of observations of high-Froude-number ship wakes that are narrower than the classical Kelvin 3 9 ∘ angle was recently offered by Rabaud and Moisy. The explanation relies on the assumption that a ship hull does not create waves longer than its length. A validation of this theoretical model has also been given. The validation is based on the approximation of the flow created by a ship hull by means of a Gaussian distribution of pressure at the free surface. These two flow models predict a wake angle ψ m a x that decreases like 1 / F as the Froude number F increases beyond F ≈ 0.5 . A third theoretical explanation was recently proposed by the authors. This theoretical explanation assumes that the wave pattern of a ship mostly consists of dominant waves that are created by the ship bow and stern, and is mostly determined by interference effects between these dominant waves. The analysis of interference effects on the Kelvin wake of a ship predicts a wake angle ψ m a x ≈ 0.14 / F 2 for a monohull ship, or ψ m a x ≈ 0.2 b / F for a catamaran with beam/length ratio b . The ‘flow models’ underlying these three alternative theoretical explanations of narrow ship wakes are examined, and the corresponding theoretical predictions are compared to the 37 observations of ship wakes reported by Rabaud and Moisy for Froude numbers F within the wide range 0.1 F 1.7 . The wake observations are found to be consistent with the predictions given by an analysis of interference between the bow and stern waves of a monohull ship, or a catamaran with beam/length ratio b within the range 0.4 ≤ b ≤ 0.8 . Indeed, agreement is consistently strong for the 35 wake observations within the range 0.1 F 1.4 . This range of Froude numbers includes the range F 0.6 , where interference between transverse bow and stern waves is important, and corresponds to the vast majority of ships. The predictions given by the Rabaud–Moisy ‘cutoff-wavelength model’ and the ‘Gaussian pressure distribution model’ are in close agreement with two wake observations for 1.6 F 1.7 and may also be consistent with several wake observations for 0.6 F 1.4 , but are not consistent with most observations. This finding and a critical examination of the assumptions underlying the Rabaud–Moisy model and the Gaussian pressure distribution model suggest that these theoretical models may not be realistic for most ships. This conclusion is further validated by numerical computations of wave patterns for F = 1 . The computed waves are largest along a ray angle that agrees with the prediction of the bow and stern waves interference model, but is noticeably smaller than predicted by the Gaussian pressure distribution model.

Experimental Investigation on Ship Wave Added Resistance in Regular Head, Oblique, Beam, and Following Waves

Abstract: Measurements on wave added resistance of a cruise ship model were carried out in regular waves in seven wave directions. The motivation for the investigation is the powering performance of ships in wave conditions. A new towing arrangement allows the ship model practically free motions in oblique seas, but makes it simultaneously possible to measure the towing resistance. The maximum resistance was encountered in bow quartering seas. The measurements show that practically all ship motion components have a clear effect on the wave added resistance. The wave elevation measured around the ship shows a clear correlation with the measured wave added resistance values.

The effects of width reduction on the damping of a cantilever beam and its application in increasing the harvesting power of piezoelectric energy harvester

Abstract: Previous work shows that when a cantilever piezoelectric energy harvester with a given width is split into several pieces and then electrically connected in parallel, the output power increases substantially compared with when it acts in a single piece with a similar total width. It was hypothesized that this increase is due to the reduction in the damping of the width-reduced beam. As a result, the beam with the smaller width vibrates with higher amplitudes and therefore has higher energy harvesting capability. In this paper, this hypothesis is examined by measuring the damping of the cantilever beam as its width is reduced. It is shown that as the width decreases, the damping is reduced, which contributes to the increase in the harvested power. It is then shown that the harvested energy from an array of cantilever piezobeams with a certain total width is higher than that from a single-piece harvester of similar width.

Rowing machine having a beam with a hinge joint

Abstract: A rowing machine includes a frame where the frame includes a first support, a second support, and a beam extending between the first support and the second support. A track is defined by at least a portion of the beam, and a sliding member is movably disposed on the track. A hinge joint is disposed in the beam between the first support and the second support defining a first section of the beam and a second section of the beam.

Ship model hydrodynamic performance testing device and method

Abstract: The invention discloses a ship model hydrodynamic performance testing device. The ship model hydrodynamic performance testing device comprises an installation platform, a fixed platform, a movement platform, a six-component balance, universal hinges and six electric cylinders; the upper ends and the lower ends of the six electric cylinders are connected with the fixed platform and the movement platform through the universal hinges; the six-component balance is installed in the center of the equilateral triangle formed by three fulcrums; the six-component balance is in rigid connection with the gravity of a testing ship model; the fixed platform is installed on a trailer beam through the installation platform; the six electric cylinders carry out telescopic movement to enable the movement platform to shift and rotate in different directions, and therefore swaying, surging, heaving, rolling, pitching and yawing movements of the ship model are simulated. The invention further provides a ship model hydrodynamic performance testing method with the ship model hydrodynamic performance testing device utilized. The ship model hydrodynamic performance testing device and method can accurately simulate the multi-degree-of-freedom movements of the ship model, various hydrodynamic parameters of the ship model can be measured under different testing states by combination with the six-component balance, and the hydrodynamic performance of the ship model is represented comprehensively.

On the presence of giant particles downwind of ships in the marine boundary layer

Abstract: This study examines large oceangoing ships as a source of giant cloud condensation nuclei (D_p > 2 µm) due to wake and stack emissions off the California coast. Observed particle number concentrations behind 10 ships exceeded those in “control” areas, exhibiting number concentration enhancement ratios (ERs) for minimum threshold diameters of ~2, ~10, and ~20 µm as high as 2.7, 5.5, and 7.5, respectively. ER decreases with increasing downwind distance and altitude. ER becomes better correlated with ship size variables (gross tonnage, length, and beam) as the minimum size threshold increases from 2 to 20 µm, whereas ship speed has a less distinct relationship with ER. One case study of a container ship shows that there are higher concentrations of sea-salt tracer species behind it relative to adjacent control areas. These results have implications for cloud properties and precipitation in marine boundary layers exposed to ship traffic.

Stability of a tumblehome hull under the dead ship condition

Abstract: Some methods for direct stability assessment under the dead ship condition were currently developed by the international maritime organization (IMO) under the Second Generation Intact Stability Criteria. Model tests and simulations are carried out to validate the numerical methods used in assessing the stability under the dead ship condition. This is done in three stages. Firstly, the uncoupled roll mathematical model (1 DOF) is adopted to calculate the roll motion based on the irregular beam waves and the steady wind. Secondly, a drift free experiment is conducted to measure the roll motion under irregular beam waves with zero speed, and then two restrained experiments with counter weights and four springs are performed under the same condition. Finally, the effects of the drift and sway motions on stability under the dead ship condition are then verified by experimental results, and the results of the numerical methods are compared to the results of the model experiments. It is concluded that more accurate numerical methods could be developed for assessing the direct stability under the dead ship condition.

Method and device for welding two thermoplastic parts to be joined along a weld seam by means of a laser

Abstract: A system for welding two thermoplastic parts to be joined (8, 9) along a weld seam (3) by means of a laser works with a laser beam (2) which - is controlled in its beam direction (R) within a working area (A) by a control method using control data corresponding to the weld seam profile to be produced, - has in the region around its focal point (f) that brings about the welding a beam dimension, in particular a beam diameter (d), that in the joining plane (F) is smaller than the target width (B) of the weld seam (S) to be produced and also is dependent on the angle of incidence (W) of the laser beam (2) on the joining plane (F) and/or on the position of the focal point (f) in relation to the joining plane (F), - is moved in a first movement component in a main advancing direction (H) along the path of the weld seam (S) to be produced, - is moved in a second, oscillating movement component, overlaid on the first, to cover the weld seam width (B) transversely to the main advancing direction (H) with an oscillation amplitude swing (OAW), and - is set by a control method in its oscillation amplitude swing (OAW) in inverse dependence on the beam dimension in the joining plane (F), preferably the beam diameter (d), in such a way that the width of the beam area passed over by the laser beam (2) in the transverse direction with respect to the main advancing direction (H) corresponds to the target width (B) of the weld seam (S).

Electric meridian beater

Abstract: The invention discloses an electric meridian beater. The electric meridian beater comprises a case, a handle, a frame, a left frame column, a right frame column, a beam, a left bearing block and a right bearing block. The electric meridian beater is characterized in that the left bearing block and the right bearing block are provided with a crankshaft; two beating positioning barrels which penetrate the beam and are fixed onto the beam are arranged under the crankshaft, the two beating positioning barrels are of the same internal structure and are respectively composed of an upper connecting rod, an upper snapping disc, a spring, a lower snapping disc and a low connecting rod, wherein the upper end of the upper connecting rod is rotatably connected with the crankshaft, the lower end of the upper connecting rod is connected with the upper surface of the upper snapping disc, the bottom surface of the lower snapping disc is connected with the upper end of the lower connecting rod, the lower end of the lower connecting rod is connected with the upper surface of a beating board, and the spring is arranged between the upper snapping disc and the lower snapping disc. The electric meridian beater has the advantages of being simple in structure, easy to manufacture, low in manufacturing cost and capable of repeatedly beating body parts with meridian unsmoothness, saving labor and achieving beating comfort and good effects.

Single-arm helical antenna with width of arm varying periodically for tilted beam

Abstract: A single-arm helical antenna with the width of the arm varying periodically for a circularly polarised (CP) tilted beam is introduced. The proposed antenna radiates a CP tilted beam, when the following two conditions are met: (i) the circumference of the proposed antenna is >4λ 0/3 (λ 0 is the wavelength in free space at the centre frequency) and (ii) the width of the arm varies periodically. The designed procedure reveals that the maximum radiation direction of the tilted beam is not sensitive to a change in frequency. The simulated and measured results show that the designed antenna radiates a CP tilted beam with θ max = 32°. The measured 10 dB return loss bandwidth is 12.8% from 2.33 to 2.65 GHz, and the experimental results of the radiation pattern, gain and axial ratio are also presented.

Ship whole elastic-plastic movement response predication method and system under action of underwater explosion

Abstract: The invention discloses a ship whole elastic-plastic movement response predication method and system under the action of underwater explosion. The method comprises the following steps: S1, simplifying a ship into a free ship body beam with an equal section; S2, dividing load pressure of the free ship body beam into five time phases under the action of the underwater explosion; S3, solving movement displacement of the free ship body beam in the five time phases under the action of the underwater explosion; S4, solving a bending moment of the ship body beam; S5, solving forward plastic movement parameters of the ship body beam; S6, solving backward elastic unloading movement parameters of the ship body beam; S7, solving backward plastic movement parameters of the ship body beam; S8, solving forward plastic movement parameters of the ship body beam. The invention further provides a system for realizing the method. According to the method and the system disclosed by the invention, the ship plastic movement process is analyzed on the basis of comprehensively considering the impact effect on the whole ship body by impact waves and air bubble loads, and engineering predication of ship whole elastic-plastic movement deformation under the action of the underwater explosion can be accurately and conveniently realized.

Rotatable align railway system and rotatalble align method for train

Abstract: According to an aspect of the present invention, a rotational alignment railway system comprises: a plurality of vehicles having where a passenger or cargo is stored; a connection beam connecting the vehicles and installed to be rotated with respect to the vehicle; a vehicle wheel connected and installed to the vehicle and installed to be rotated with respect to the vehicle; and a track installed in the lower side of the vehicle and having rails supporting the vehicle. The track comprises: a first section where two rails are positioned; and a second section where four rails are positioned. At least one among the vehicle wheels positioned on the same rail in the first section is positioned on the rails different from each other in the second section.

Vehicle body front part structure

Abstract: PROBLEM TO BE SOLVED: To disable a gusset which transmits the impact load in a small overlapping collision at the time of a full lap collision to enable an acquisition of an excellent impact absorption performance.SOLUTION: An easy-deformation part 8 is formed on inside the vehicle width direction of a crash box 4 interposed between a front side frame 3 and a bumper beam 2. Also, a gusset body 9a extending forward in an angularly opening manner toward outside the vehicle width direction is fixed on outside the vehicle width direction of the front side frame 3. The gusset body 9a's front end surface 9d is set to oppose to an offset part 2b provided on the end part of the bumper beam 2. At the time of a full lap collision, when the bumper beam 2 is retreated, as a center part 2a starts bending in a concave manner toward backward, a crash box 4 is pulled in inside the vehicle width direction to be bent with an easy-deformation part 8 as an initial point. Accordingly, the end part of the offset part 2b deforms so as to be opened toward the vehicle front side, and its back surface 2c presses an inner end edge part 9e that is on the front end surface of the gusset body 9a to incline the gusset body 9a toward outside the vehicle width direction.

Entrainment of Air at the Transoms of Full-Scale Surface Ships

Abstract: The authors report on the results from a series of full-scale trials designed to quantify the air entrainment at the stern of an underway vessel. While an extremely complex region to model air entrainment due to the confluence of the breaking transom wave, bubbles from the bow, turbulence from the hull boundary layer, and bubbles and turbulence from propellers, the region is a desirable area to characterize and understand because it serves as the initial conditions of a ship's far-field bubbly wake. Experiments were conducted in 2003 from R/V Revelle and 2004 from R/V Athena II using a custom-built conductivity probe vertical array that could be deployed at the blunt transom of a full-scale surface ship to measure the void fraction field. The system was designed to be rugged enough to withstand the full speed range of the vessels. From the raw time-series data, the entrainment of air at speeds ranging from 2.1 to 7.2 m/s is computed at various depths and beam locations. The data represent the first such in-situ measurements from a full-scale vessel and can be used to validate two-phase ship hydrodynamic computational fluid dynamics (CFD) codes and initialize far-field, bubbly wake CFD models.

Lifting device for panel TV set

Abstract: The utility model discloses lifting device for a panel TV set. The device comprises a base (1), a panel TV set fixing rack (4). The device is characterized in that a fixing bracket (5) is fixed on the base (1) through a screw fastening part, wherein the fixing bracket (5) comprises a left rod, a right rod and an upper end cross beam; two guide rods (2) are fixed on the fixing bracket (5) and the base (1) through fastening screws; a lifting sliding box (6) is mounted on the guide rods (2) through guide holes; mechanical micro limit travel switches (3) are arranged at the upper side and the lower side of the lifting sliding box (6); the panel TV set fixing rack (4) is mounted on the lifting sliding box (6); a driving mechanism is arranged in the lifting sliding box (6); a motor (7) is mounted on a motor fixing seat (12); a gear (8) is fixed on a motor shaft; a rack (9) which engages with the gear (8) is mounted on the fixing bracket (5) and the base (1). The lifting device for the panel TV set is simple in structure, convenient to mount, and reliable to work.

Test device for hydrodynamic performance of ship model

Abstract: The utility model discloses a test device for the hydrodynamic performance of a ship model. The device includes an installation platform, a fixed platform, a motion platform, a six-component balance, universal hinges, and six electric cylinders. Upper and lower ends of the six electric cylinders are connected with the fixed platform and the motion platform through the universal hinges respectively. The six-component balance is installed at the center of an equilateral triangle formed by three fulcrums. The six component balance is rigidly connected with the gravity center of the test ship model. The fixed platform is installed on a trailer beam through the installation platform. The six electric cylinders enable the motion platform to generate movements and rotations in different directions through telescopic movement so that swaying, surging, heaving, rolling, pitching and yawing motions of the ship model are simulated. The test device is capable of accurately simulating motions of a plurality of freedom degrees of the ship model and measuring different kinds of hydrodynamic parameters of the ship model during different test states in combination with the six component balance so that the hydrodynamic performance of the ship model is represented comprehensively.

Unilateral separates walk and crosses mound style case roof beam inspection trolley

Abstract: The utility model discloses an unilateral separates walk and crosses mound style case roof beam inspection trolley, the vertical telescopic bracket in web two outsides of case roof beam is located respectively including the two, vertical telescopic bracket's top is equipped with fixed platform, and vertical telescopic bracket's below is equipped with the inspection platform of arranging along case roof beam width direction, the flange plate of case roof beam lower end is equipped with flange plate bottom track along the length direction of case roof beam, and fixed platform's top hangs on the track of flange plate bottom by a running gear, its characterized in that: link to each other through horizontal rotation mechanism between fixed platform and the vertical telescopic bracket, the bottom of two inspection platform crosses in the bottom plate below of case roof beam to it is fixed through the hasp. The utility model discloses it can be light through pier and simple structure, quality to have, the flexibility can be strong, easy operation, beneficial effect safe in utilization.

Ship with azimuting tractor drive

Abstract: The invention concerns a ship (1) comprising a hull (8) and a length that is less than 3.0 times and preferably less than 2.5 times a beam of the hull, located forward of the amidships two propulsion and steering units (6) with a propulsion drive for rotating propellers around a propeller axis (5) and a steering drive for positioning the propeller axis at a steering angle relative to a centreline (20) of the hull, and rearward of the amidships stationary course stabilising skegs (9) located symmetrically on both sides of a centreline (20) of the hull. The distance between the fronts of the stabilising skegs is between 30% and 70% of the beam and preferably between 30% and 70% of the beam.

Airflow distortion at instrument sites on the ODEN during the ACSE project

Abstract: Wind speed measurements obtained from anemometers mounted on ships are prone to systematic errors caused by the distortion of the air flow around the ship's hull and superstructure. This report describes the results of simulations of the air flow around the ODEN made using the computational fluid dynamics (CFD) software VECTIS. The airflow distortion at anemometer sites used during the ACSE project has been quantified at a wind speed of 7 ms-1 for a wide range of wind directions: every 10 degrees from bow on to 120 degrees off the bow, and an additional run was undertaken at 150 degrees off the bow. The anemometers used in this study were located in the bows of the ship. The vertical displacements of the airflow at the anemometer sites and at a location of an aerosol intake are included. Wind speed profiles above a motion-stabilised doppler lidar were also obtained. For bow-on flows the anemometers in the bows of the ship experienced relatively small flow distortion. At these sites the flow was decelerated by about 3% of the free stream wind speed. Over the full range of relative wind directions the flow to the METEK sonic is generally accelerated with the largest wind speed biases at flows directly over the beam. The vertical displacement of the airflow increases from around 3 m for flows directly over the bow, to around 6 m for flows over the ship's beam as the lockage of the airflow by the ship becomes greater. The vertical displacement at the aerosol intake location varied from 6m for flows directly over the bow, to around 16 m for flows over the ship's beam. The ship imposes a significant obstacle to the flow and forces a strong vertical velocity in the lowest few tens of meters above the lidar.

System and method for low ecology impact generation of hydroelectric power

Abstract: A hydro-electric power system includes two containers and a support beam having two ends, each end holding one of the containers. The ends allow the containers to travel along a length of the support beam. The support beam pivots about a pivot point, giving each container a maximum height and a minimum height. Water flows into each of the containers when they are located at or near their maximum height, the flow of water weighting each container and causing it to descend, each container moving longitudinally outward from the pivot point along the support beam as it descends. A tipping mechanism causes each container to release water at or near its minimum height, each container ascending after releasing water and moving longitudinally inward toward the pivot point along the support beam as it ascends.

Device for large-span vertical curve steel case liang bulvshiding push away

Abstract: The utility model relates to a device for large-span vertical curve steel case liang bulvshiding push away, for the solution bridge, in the construction of engineerings such as grade separation, to the safe removal of large-span vertical curve steel case roof beam, the problem of taking one's place fast, including setting up the pusher on the steel longeron, characterized by is equipped with the steel bearing beam in the pusher both ends outside, is equipped with bulb fulcrum adaptation ware on the steel bearing beam, said bulb fulcrum adaptation ware include with moved steel case soffit complex on support, the under bracing of location on the steel bearing beam is gone up to support and is passed through the bulb with the under bracing and hinge the bridge erection of adaptation complex environment, the bulb fulcrum that changes through adaptation roof beam body curve line type adapts to the ware, guarantees that the adaptation roof beam body line type of steel bearing beam in the work progress changes and the part of bearing point department does not produce the deformation, and reduction vertical curve steel case back pushes away the elevation of work progress and adjusts the time, improves the top and pushes away the construction work efficiency

Shock absorbing structure

Abstract: PROBLEM TO BE SOLVED: To provide a shock absorbing structure capable of exhibiting an energy absorption characteristic of an energy absorbing member to the maximum even for either of offset collision and full lap collision even while simplifying a design workSOLUTION: A shock absorbing structure includes: an energy absorbing member 20 fixed to the car body side and; a junction part 30 which, while setting a longitudinal direction along the back and forth direction of a vehicle, connects a base edge part 31a to the energy absorbing member, connects a tip part 31b to a bumper beam and, when a collision load is inputted to the car body side from the bumper beam side, applies a load to the energy absorbing member while being crushed in the longitudinal direction The tip part of the junction part has such an inclined shape that, as proceeding from the width direction center side of the vehicle to the width direction outer side, a distance from the energy absorbing member is gradually decreased, such a gradual increasing region 70 that, as proceeding from the width direction center side of the vehicle to the width direction outer side, the width in a height direction of the vehicle is gradually increased and such a gradual decreasing region 71 that the width in the height direction of the vehicle is gradually decreased

Complete fluent strip goods shelves

Abstract: The utility model discloses a complete fluent strip goods shelves, include by keeping off the frame that the roof beam is constituteed before support post and a plurality of layer to and lay in both sides between the preceding fender roof beam fluent all is equipped with the middle standing pillar between the support post at preceding fender roof beam both ends, be fixed with between two middle standing pillars with the intermediate beam of the same number of piles of preceding fender roof beam, each layer the intermediate beam is higher than with keeping off the roof beam before the layer, just the intermediate beam with with keeping off the liangping line before the layer. The utility model discloses a fluent of the two -sided slope can make the goods place from one side and forward the opposite side week to the packing is sorted to abundant time occasionally to it is the design of a hommization to have improved work efficiency, simplified work flow.

Ship pitch and roll comprehensive vector coordinate transformation antenna beam pointing direction correcting method

Abstract: The invention discloses a ship pitch and roll comprehensive vector coordinate transformation antenna beam pointing direction correcting method which is used for solving the problem of influences of ship swinging and antenna postures on the antenna beam pointing direction. The beam pointing direction in an antenna coordinate system can be rapidly corrected to the beam pointing direction in a geodetic coordinate system by building a mathematic model of relationships between the antenna beam pointing direction and the antenna postures and between the antenna beam pointing direction and the ship pitch and roll. By means of the method, the accuracy of the antenna beam pointing direction under the ship pitch and roll condition and the antenna rotating condition can be remarkably improved, and the method is simple, practicable and high in operability.

Ship floating maintenance platform

Abstract: The invention discloses a ship floating maintenance platform which comprises longitudinal floating bodies on the two sides and a transverse floating body vertically and fixedly connected with the longitudinal floating bodies. A ship tail lifting device stretches across the middles of the two longitudinal floating bodies, and comprises a pair of vertical gantries, a ship tail lifting beam and a ship tail lifting beam lifting mechanism, and the ship tail lifting beam stretches across the inner sides of the two longitudinal floating bodies and comprises a lower cross beam and a pair of stand columns. The lower ends of the vertical segments of the stand columns are fixedly connected with the two ends of the lower cross beam respectively, and the ship tail lifting beam lifting mechanism comprises a fixed pulley set, a movable pulley set and a loading winch. A stand column lifting guide mechanism is arranged between concave openings in the inner sides of the longitudinal floating bodies and the vertical segments of the stand columns, and stand column locking mechanisms are symmetrically arranged on the two sides of the stand columns. The ship floating maintenance platform is reasonable in arrangement and fast and convenient to use, the tail of a ship can be lifted fast, a rudder blade and a propeller are made to be out of water for maintenance, and maintenance cost is lowered. Use time is short, and work efficiency is high. The ship repairing cost is greatly lowered.

Welding jig for continuous track beam

Abstract: The utility model provides a welding jig for a continuous track beam. The welding jig comprises at least two symmetrically-arranged turnover mechanisms. Each turnover mechanism comprises a horizontally-arranged operating platform, a jig base body, multiple rollers and a clamping mechanism used for clamping the continuous track beam, wherein the jig base body is formed by combining a jig base and an upper cover plate, the complete base body is provided with a circular peripheral face, the operating platform is sequentially provided with a first support, a second support and a third support in the vertical direction, the inner side of the first support is rotatably connected with the first roller arranged on one side of the jig base body, the upper end of the second support is rotatably connected with the second roller used for bearing the jig base body, and the inner side of the third support is rotatably connected with the third roller arranged on the other side of the jig base body. A sliding rail used for rotating each jig base body is formed by the three corresponding supports and the corresponding rollers, supporting performance is good, the jig base bodies are unlikely to disengage, and less effort is used for turnover.

Many davits of both shoulders and crane beam connection structure

Abstract: The utility model discloses a many davits of both shoulders and crane beam connection structure, characterized by sets up multichannel crane beam on both shoulders steel corbel, both shoulders steel corbel is the left side bracket of symmetrical on the flange plate of the left side of steel column and the right bracket of welding on the listrium of the right side of steel column, multichannel crane beam is left front section roof beam and the left back section roof beam that erects on the top surface of left side bracket, and erect right front section roof beam and the right back section roof beam on the top surface of right side bracket, left front section roof beam and left back section roof beam are in on the same straight line, and erect jointly on the top surface of right side bracket with respective one end, right front section roof beam and right back section roof beam are in on the same straight line to erect jointly on the top surface of left side bracket with respective one end. The utility model discloses connected node is simple, easily operation, and the structure is firm, and it is strong to support the performance.

Energy-absorbing beam member

Abstract: An energy-absorbing (EA) beam member and having a cell core structure is positioned in an aircraft fuselage proximate to the floor of the aircraft. The cell core structure has a length oriented along a width of the fuselage, a width oriented along a length of the fuselage, and a depth extending away from the floor. The cell core structure also includes cell walls that collectively define a repeating conusoidal pattern of alternating respective larger and smaller first and second radii along the length of the cell core structure. The cell walls slope away from a direction of flight of the aircraft at a calibrated lean angle. An EA beam member may include the cell core structure and first and second plates along the length of the cell core structure on opposite edges of the cell material.