Showing papers on "Beam (nautical) published in 1999"

Apparatus suitable for searching objects in water

Abstract: A fish finder having two 1D transducer arrays vertically arranged on a ship's hull. Each 1D transducer array provides a beam having a narrow width on a plane parallel to a plane in the transducer arrangement direction, and a fan-like beam on a plane crossing the plane. Ultrasonics are transmitted toward and received from the target on the first plane, by using the fan beam of the first 1D transducer array, and received from the second plane perpendicular to the first plane by using the fan beam of the second 1D transducer array. While the beam direction of the first 1D transducer array is gradually changed, that of the second 1D transducer array is rapidly changed so that information concerning the 3D space below the water surface is obtained. The obtained information is subjected to ray tracing processing for 3D displaying of an image on a 2D screen. This arrangement enables quicker detection of fish schools.

Method and arrangement for inspection of buoyant objects

Abstract: The invention relates to a method and a device for determining the thickness and topography of buoyant objects, especially ship's hulls (1), by means of a beam (2, 17) carrying an array of ultrasound sensors (3). The object (1) and the beam (2) are moved relative to each other in the object's longitudinal direction while the distance between the object and the beam are automatically adjusted by raising/lowering the beam (2) by means of lifting means (6) and/or distance elements secured by floating bodies (4). The invention also relates to a device for implementing the method.

Hydrofoil sail craft

Abstract: A sailing craft includes a single hydrofoil assembly (3), an aerofoil assembly (7), and a hull (5) with a rigid beam (8) interconntecting the hydrofoil assembly (3), the aerofoil assembly (7) and the hull (5) wherein the hull (5) is separate and displaced from the hydrofoil assembly (3) and is, in use, supported above the water by the rigid beam (8). Preferably, the hydrofoil assembly (3), the aerofoil assembly (7) and the hull (5) are interconnected such that the hydrofoil assembly (3) and aerofoil assembly (7) are disposed at opposite ends of the rigid beam (8) and the hull (5) is connected to the beam (8) at a position therebetween.

Lateral light system of automobile

Abstract: The lateral light system for automotile includes one pair of side lamps, which are in the right and left front corners of automobile, outside or below the front lamps and with beam center lines at the angle of 45 deg with those of the front lamps; reflectors; and control circuit; it includes battery, switches and conductor wires. The side lamps are connected parallelly with the front lamps, are controlled by both the switch for the front lamps and the switch for the side lamps, and has brightness similar to that of the front lamp or controllable one. The side lamps light the area range beyondboth sides of that lighted by the front lamps, so that the lateral light system increases the lamp lighted area and makes the automobile more safe in night running.

Resistance Tests of Tanker and High Length-to-beam-ratio Ship Models

Abstract: In the 1 st report, a new technique for reducing frictional drag using a super water repellent surface and air-injection (SWR & A method) was proposed, and its effectiveness for two-dimensional flow was confirmed by carrying out pressure loss tests in a rectangular tube and resistance tests on a horizontal flat plate.This paper presents the results of resistance tests applying the new technique to a tanker model of 7.2 m long and a high length-to-beam-ratio ship model of 12 m long. The results of these tests show that the new technique can significantly reduce frictional drag of the tanker model and the high length-to-beam-ratio ship model, and that frictional drag on the SWR surface of the 12.0 m high length-to-beam-ratio ship model was reduced by 75% at a speed of 6 m/sec, which is the same reduction rate obtained with the flat plate.

Ship propulsion and steering systems

Abstract: A propulsion and steering system for reducing water mounding along and under a bow and hull of a mono-hull ship thereby enhancing displacement of water by the hull and permitting increase of the beam to length ratio of the ship comprising two or more thrust chambers, each of the thrust chambers passing lengthwise through the hull below a waterline of the ship, each of the thrust chambers having an open bow end and an open stern end, and a bow of the ship configured to channel water into the bow ends of the thrust chambers. Preferred configurations of the bow are disclosed. A propeller or turbine thruster is preferably positioned in each of the thrust chambers for propelling water through the thrust chamber. Each of the thrust chambers preferably has one or more outlet ports passing through an outer wall thereof, the outlet ports positioned aft and adjacent the propeller or turbine thruster, and a gate pivotally secured in the thrust chamber aft and adjacent the outlet ports such that the gate can be pivoted to permit selective channeling of propelled water through the outlet ports to thereby contribute to steering and maneuvering the ship. The gate may be sized and configured to substantially seal the thrust chamber.

Torsion beam type suspension

Abstract: PROBLEM TO BE SOLVED: To improve the durability by smoothing the stress change along the extending direction at both end parts of a torsion beam. SOLUTION: At both end parts of a torsion beam 6, a section changing point P is set at the inward of an end part of a first reinforcement 7 in the vehicle width direction. The sectional shape on a trailing arm 1 side is substantially V-shaped by increasing the curvature of a top part on one side of the changing point P, while the sectional shape on a center part side in the vehicle width direction is formed substantially U-shaped by squeezing the top part 6a to relatively increase the curvature of the top part 6a.

Frictional Drag Reduction with Air Lubricant over Super Water Repellent Surface(2nd Report) -Resistance Tests of Tanker and High Length-to-beam-ratio Ship Models-

Abstract: In the 1 st report, a new technique for reducing frictional drag using a super water repellent surface and air-injection (SWR & A method) was proposed, and its effectiveness for two-dimensional flow was confirmed by carrying out pressure loss tests in a rectangular tube and resistance tests on a horizontal flat plate. This paper presents the results of resistance tests applying the new technique to a tanker model of 7.2 m long and a high length-to-beam-ratio ship model of 12 m long. The results of these tests show that the new technique can significantly reduce frictional drag of the tanker model and the high length to-beam-ratio ship model, and that frictional drag on the SWR surface of the 12.0 m high length to beam-ratio ship model was reduced by 75% at a speed of 6 m/sec, which is the same reduction rate obtained with the flat plate.

Impact beam of automotive door

Abstract: PROBLEM TO BE SOLVED: To improve the impact protecting effect by providing an impact beam made of a super-high strength steel having a trapezoidal closed section, and setting the widths of the outside flange part and inside flange part of the impact beam to specified dimensional ratios. SOLUTION: A reinforcing beam 14 is made of a super-high steel having a trapezoidal closed section and set to a height of about the waist of a person sitting in a vehicle, and it has curved web parts 22, 24 horizontally extending in the lateral direction of a side door, an outside flange part 26 and an inside flange part 28. The width W1 of the outside flange part 26 is set to 14 times or less the thickness (t) of the reinforcing beam 14, and the width W2 of the inside flange part 28 is set to about 0.75 times or less the width W2 . The inside flange part 28 is formed by welding both ends 30, 32 of the reinforcing beam 14 in a weld part 34 after rolling. The weld part 34 preferably consists of an induction heating welding continued over the whole length of the reinforcing beam 14.

Machine beam for elevator

Abstract: PROBLEM TO BE SOLVED: To make a machine beam weldable to a building steel frame or the like using cutout parts or through holes formed in a flange part even in the case of the flange width of the building steel frame and the flange width of the machine beam being almost the same by forming the cutout parts or through holes in the flange parts. SOLUTION: When the flange of an upward rising machine beam 6a, and the flange of a building steel frame 4a have almost the same width, it is difficult to obtain a welding margin along the longitudinal direction so as to have a state of being able to weld only at both end parts in the longitudinal direction. Cutouts 8 are therefore formed in the flange in positions avoiding reinforcing members 7 of the upward rising machine beam 6a. Accordingly, even with slight dislocation between the upward rising machine beam 6a and building steel frame 4a, the flange of the upward rising machine beam 6a and the flange of the building steel frame 4a can be welded and fixed making use of the cutout parts 8. Installation of a hoisting machine 1 and a deflector wheel 2 to a machine room is therefore facilitated.

Streamer handling on seismic survey vessels

Abstract: A streamer handling and towing system for a seismic survey vessel comprises a beam 42 secured to the underside of the deck 50 of the vessel immediately above the streamer deck 20, so that it extends longitudinally of the vessel above normal head height. The beam is pivoted at its bow end, and supported at its other end by a telescopic arm 56 which can lower that end towards the streamer deck. A carriage 60 supporting a spooling block 34 for the streamer 28 is movable in both directions along the beam. During towing, the beam is held in its raised position, with the spooling block at the bow end of the beam. When it is desired to work on the streamer, the carriage is moved along the beam to the other end, which is then lowered towards the streamer deck to provide convenient waist high access to the streamer 28. In the working position of the beam, the streamer is supported by a segment 59 on the beam end and by a curved surface 72 of a stern rail 70.

The Effect Of A Constant Heeling Moment On The Main And Superharmonic Roll Response Of A Ship In Regular Beam Seas

Abstract: The generalised harmonic balance method is used to investigate the dc, fundamental, second and third harmonic components in the roll response ofa biased ship in regular beam waves. The resulting four balance equations then yield both the main resonance response, and the dominant superharmonic resonances (if any), which are compared to the unbiased case. Differences in the behaviour of ship models with roll stiffening, or roll softening righting moments under biased conditions are also investigated, and are found to be significant. The results for all these cases have been validated against simulation, and the two show excellent agreement across the frequency range considered.

Haunch plate for column and beam connection of steel frame structure

Abstract: PROBLEM TO BE SOLVED: To prevent brittle fracture by providing a parallel part having substantially the same width as flange width on a joining part with a flange, and integrally continuously providing a haunch part in which the width is gradually enlarged toward a column from the end on the parallel part. SOLUTION: A punch plate 10 is welded between a column 2 and the flange 1a of an H shape steel beam 1, and the column 2 and the H steel beam 1 are connected. A parallel part 10a of substantially the same width as that of a flange 1a is provided and a haunch part 10b in which the width is gradually enlarged from the parallel part 10a is continuously provided. Load producing plastic deformation is acted on the haunch part 10b, and the area change of a stress transmission face in a welding part W connecting them is lessened to suppress concentration of stress on the welding part W by making the width of the parallel part 10a and the flange la substantially the same. Thus, action stress for the welding part is reduced to suppress occurrence of cracks and brittle fracture in the welding part.

Method and apparatus for forming image

Abstract: PROBLEM TO BE SOLVED: To properly adjust a pulse width in an apparatus for forming halftone images in units of dots by modulating the pulse width of a laser light. SOLUTION: An adjustment data is supplied to a current modulation means 7, whereby a laser beam modulated in pulse width is projected from a laser projection means 3. A quantity of the laser beam is detected by a laser monitor means 4. A pulse width of the current modulation means 7 is adjusted by a pulse adjustment means 32. At this time, the supply of the adjustment data and the detection of the laser light quantity are carried out at a predetermined later time after a beam detection means 13 detects the beam. Accordingly, the quantity of the laser beam is measured for adjusting the modulation pulse width at a constant position in a main scan direction and influences when drive current of the laser projection means 3 is adjusted are made constant, so that the pulse width is adjusted properly.

Shore protection construction material for vegetation and construction method by using the same

Abstract: PURPOSE: The vegetation-bank protection execution materials and the works are provided, which prevents a bank loss by tractive forces and activates river vegetation and provides fishes' habitat abundantly and protects an aquatic ecosystem. CONSTITUTION: The vegetation-bank protection works comprises the steps of; laying an upper bearing beam (1), which a bolt (7) fixing a rope is planted on the plate surface at regular intervals, on the top end of a bank; laying a L-shaped lower bearing beam (2), which a bolt (7) fixing a rope is planted on the upper side of a wall (2b), on the lower end of a bank; laying a strutted beam (3) planting a bolt (7) on the upper side of a wall (2b), which stands on the upper-middle side of a slab (2a) between an upper bearing beam (1) and a lower bearing beam (2); laying a vegetation mat (8) on an upper bearing beam (1), a lower bearing beam (2) and a strutted beam (3); covering a vegetation mat with a wire net (10); fixing a bolt boring (4a) of a rope support (4) to a bolt of a strutted beam (3); installing a rope (6) between a bolt projected above a rope support and a bolt of other adjacent strutted beam; covering with earth after installing a rope (6) between a bolt of an upper bearing beam (1) and a bolt of a lower bearing beam (2); building a wire cylinder (13) below a lower bearing beam (2).