CN110615063A - Test device for testing artificial periodic hull beam fluctuation characteristics - Google Patents
Test device for testing artificial periodic hull beam fluctuation characteristics Download PDFInfo
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- CN110615063A CN110615063A CN201910999650.4A CN201910999650A CN110615063A CN 110615063 A CN110615063 A CN 110615063A CN 201910999650 A CN201910999650 A CN 201910999650A CN 110615063 A CN110615063 A CN 110615063A
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Abstract
The invention belongs to the technical field of ship and ocean engineering, and particularly relates to a test device for testing the fluctuation characteristic of an artificial periodic beam. The invention has wide application range, is different from a general periodic structure in which damping sheets or damping layers are arranged on beam plates to simulate, and can be used for the fluctuation characteristic test of various actual artificial periodic beam structures, in particular to various hull longitudinal girders or hull plate frames comprising transverse bulkheads, transverse beams and other structures. The invention utilizes the holes uniformly distributed on the longitudinal beam and the bottom plate to conveniently adjust the beam distance and the boundary condition, changes the parameters of the mass, the rigidity and the like of the spring mass vibrator of the artificial periodic beam, and really realizes the purpose of measuring various different artificial periodic hull beam structures by using one set of device. Meanwhile, different materials such as aluminum alloy, copper alloy and the like can be used for measuring the fluctuation characteristics of other similar artificial periodic beams containing the cross structure. The invention has simple structure, convenient operation and lower processing and manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of ship and ocean engineering, and particularly relates to a test device for testing the fluctuation characteristic of an artificial periodic beam.
Background
An artificial periodic structure is formed by connecting a plurality of identical structural units in the same way, and has an important fluctuation characteristic that vibration in certain frequency ranges cannot pass through when an elastic wave propagates in the periodic structure, and is called a band gap. The testing device for the artificial periodic hull beam fluctuation characteristic can test the band gap characteristic of a beam structure, is beneficial to the acoustic design of the structure, for example, the geometric parameters and the material parameters of the periodic structure are reasonably designed, the vibration band gap is obtained in a certain frequency range, further the propagation of vibration is effectively inhibited, and the vibration reduction effect is achieved, so that the testing device has wide application background.
The principle of the test is that spring mass vibrators are periodically arranged on thin straight beams with certain lengths, and beams crossed with the thin straight beams are used for simulating an artificial periodic hull beam structure and measuring the band gap characteristic of the artificial periodic hull beam structure. The structural parameters of the thin straight beam comprise the elastic modulus E, the density rho, the section inertia moment I, the sectional area A, the length and the like of the material of the beam, and are used for simulating the structures of the strong beam such as the inner keel of the ship; the parameters of the spring mass vibrator comprise the installation position on the periodic unit, the distance l, the distance determination by a transverse member, a transverse bulkhead, a rib, a cross beam and the like in the hull plate frame structure, the spring stiffness k and the concentrated mass m, and the support influence of the transverse member on the longitudinal structure.
According to the traditional test device, a circular ring is sleeved on a beam at equal intervals to serve as a damping layer or damping sheets are placed on a metal thin plate at equal intervals to simulate an artificial periodic beam and a spring mass vibrator on the artificial periodic beam, then exciting force is input to one end of the beam through a vibration exciter to enable the beam to generate vertical bending vibration, acceleration sensors are placed at two ends of the beam, and the purpose of testing the fluctuation characteristic is achieved by analyzing a frequency response function. For practical complex structures such as ship body grillage, the damping coefficient is difficult to determine, so that the traditional method is mostly limited to theoretical research; in addition, the test of the fluctuation characteristic of the hull beam should be convenient for change different parameters, measure many times, easily operate, and when measuring different grillages of polylith usually, every board all need weld alone, and not only processing is time-consuming, needs higher experimental cost moreover, and few are fit for the test device who is applicable to test hull beam fluctuation characteristic more than the characteristics. The invention improves the existing test device, and solves the problems of the traditional device to a certain extent.
Disclosure of Invention
The invention aims to provide a test device for testing the fluctuation characteristic of a manual periodic hull beam.
The invention is realized by the following technical scheme that the device comprises a longitudinal beam and a module bottom plate; the longitudinal beam is an I-shaped cross section, and I-shaped holes are formed in a web plate of the longitudinal beam at equal intervals; transverse beams are periodically inserted into all or a plurality of I-shaped holes on the longitudinal beam web plate at intervals; the transverse beam and the longitudinal beam are fixed through a clamp; a clamp supporting seat is arranged at the corresponding position of the module bottom plate according to the longitudinal beam opening; the clamps are all installed on the clamp supporting seat.
The present invention may further comprise:
the clamp comprises a clamping block; the clamping blocks are respectively arranged at the upper end and the lower end of the transverse beam, the lower end clamping block is fixed on the clamp supporting seat through a screw rod, and the upper end clamping block is connected with the rotary handle through the screw rod.
The clamping blocks are flat-head clamping blocks or semi-cylindrical clamping blocks.
The module bottom plate is fixed on the bottom surface, and ballast blocks are arranged on four sides of the module bottom plate.
The cross section parameters of the transverse beam are determined according to the actual ship crossbeam structure, and the scaling relation between the cross section area and the cross section inertia moment is ensured.
The invention has the beneficial effects that:
the invention has wide application range, is different from the general periodic structure of the simulation of arranging the damping fins or the damping layers on the beam slab, and is mostly limited to theoretical research; the invention can be used for the wave characteristic test of various actual artificial periodic beam structures, in particular to various hull longitudinal girders or hull plate frames comprising transverse bulkheads, transverse beams and other structures. Meanwhile, the structure is simple, the operation is convenient, and the processing and manufacturing cost is low; the invention has the greatest characteristic that the space between the cross beams and the boundary condition are conveniently adjusted by uniformly distributing holes on the longitudinal beam 1 and the bottom plate, the parameters such as the quality, the rigidity and the like of the artificial periodic beam spring mass vibrator are changed, and the aim of measuring various different artificial periodic hull beam structures by using one set of device is really realized. Meanwhile, different materials such as aluminum alloy, copper alloy and the like can be used for measuring the fluctuation characteristics of other similar artificial periodic beams containing the cross structure.
Drawings
Fig. 1(a) is a front view of the present invention.
Fig. 1(b) is a side view of the present invention.
FIG. 2(a) is a front view of a clamp with a flat clamping block.
FIG. 2(b) is a side view of a clamp with a flat clamping block.
Fig. 3(a) is a front view of a clamp with arcuate clamping blocks.
Fig. 3(b) is a side view of a clamp with arcuate clamping blocks.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention aims to provide a test device for testing the fluctuation characteristic of an artificial periodic hull beam, in particular to a band gap characteristic test device applied to a hull plate frame and similar artificial periodic beam structures containing cross members.
Referring to fig. 1(a) and 1(b), the invention is a beam structure fluctuation characteristic test device, and the basic structure of the device comprises a longitudinal beam 1, a transverse beam 2, a rotating handle 3, a screw rod 4, a clamping block 5, a supporting seat 6, a fixing bolt 7, an anchor bolt 8, a module bottom plate 9 and a ballast block 10. The rotary handle 3, the screw rod 4, the clamping block 5 and the supporting seat 6 form a clamp for fixing the transverse beam 2.
A test device for testing the fluctuation characteristics of artificial periodic hull beams comprises artificial periodic longitudinal beams 1 with holes at equal intervals, transverse beams 2, clamps for fixing the transverse beams 2 and a module bottom plate 9. The beam is an I-shaped cross section, I-shaped holes are formed in a web plate of the beam at equal intervals, I-shaped transverse beams 2 can be arranged in all the holes, the transverse beams 2 can be periodically inserted into a plurality of holes at intervals, the cross section parameters of the transverse beams 2 are determined according to the actual cross beam structure of the ship, the thickness of the web plate can be slightly larger than the actual value, the welding requirement is convenient, ship plate frames with different rib distances in a single period can be simulated through the design, and the operation is convenient. The clamp consists of a rotary handle 3, a screw rod 4, a clamping block 5 and a supporting seat 6 and is arranged on the transverse beam 2; the clamping block 5 can be flat-head or semi-cylindrical, the clamp with the flat-head clamping block can provide a supporting boundary for the transverse beam 2, and if the clamping block is replaced by the semi-cylindrical clamping block, the arc-shaped cylindrical surface of the clamp can provide a simple supporting boundary for the transverse beam 2; the supporting seat 6 is provided with a through hole, and the clamp can be fixed with a bottom plate below through a bolt. The fixture can play a role in fixing the transverse beam 2, and the influence of the rotation of the transverse beam 2 on the test is prevented. A module bottom plate 9 is firstly paved on the ground, four ends of the bottom plate are fixed with the ground through foundation bolts 8, and the possibility of errors caused by uneven ground and other reasons is reduced; holes are formed in the plate at equal intervals along the direction of each transverse beam 2, a clamp supporting seat 6 is fixed with a module bottom plate 9 through a fixing bolt 7, and a clamp can be moved and fixed at different positions on the transverse beams 2 to change the rigidity of the transverse beams 2; meanwhile, a plurality of ballast mass blocks are arranged on four sides of the bottom plate, so that the influence of the vibration of the bottom plate on the vertical bending vibration of the artificial periodic beam is prevented.
The clamp for fixing the transverse beam 2 comprises a rotary handle 3, a screw rod 4, a clamping block 5 and a supporting seat 6, and can provide a supporting boundary for the transverse beam 2, the clamp with the flat-head clamping block can provide a supporting boundary for the transverse beam 2, the clamping block 5 can be disassembled and replaced into a semi-cylindrical shape, and the arc-shaped cylindrical surface of the clamping block can provide a simple supporting boundary; and four ends of the module bottom plate 9 are fixed with the ground through foundation bolts 8, holes are formed in the plate at equal intervals along the direction of each transverse beam 2, and the clamp is fixed through fixing bolts 7. The manual periodic longitudinal beam 1 is provided with I-shaped holes at equal intervals, the section parameters and the length of the longitudinal beam 1 are determined by the actual scaling relationship of the ship longitudinal beam, and if a test plate frame is used, the plate can be converted into a strip plate of the longitudinal beam 1. The transverse beam 2 is an I-shaped cross section and can be inserted into the hole of the longitudinal beam 1 at a certain interval, and the interval is adjusted to simulate the ship body plate frames with different rib distances in a single period; the clamps can also be arranged at different positions on the transverse beam 2, the supporting influence of the transverse beam 2 on the longitudinal beam 1 is changed, the clamps are fixed on holes at corresponding positions of the module bottom plate 9, and the monocycle hull beam and the bicycle coupling hull plate frame structure with the transverse bulkhead and the transverse beam with different rigidities are simulated.
The main functions of the present invention can be achieved by: the module bottom plate 9 is arranged on the ground in advance, and the four ends of the module bottom plate are fixed with the ground through foundation bolts 8, so that the possibility of errors caused by uneven ground and other reasons is reduced; meanwhile, a plurality of ballast blocks 10 are arranged on four sides of the module bottom plate 9, so that the influence of plate vibration on bending vibration of the upper beam can be prevented; the longitudinal beams 1 are placed on the module bottom plate 9, I-shaped holes are formed in the beams at equal intervals, and the transverse beams 2 are inserted at certain intervals and used for simulating an actual ship body beam model with bulkheads and transverse beams; the section parameters of the transverse beam 2 are determined according to the actual ship beam structure, the scaling relation between the section area and the section inertia moment is ensured, the web thickness can be slightly larger than the actual value, and the welding requirement is facilitated; the rotary handle 3, the screw rod 4, the clamping block 5 and the supporting seat 6 form a clamp, the rotary handle 3 is rotated anticlockwise, the screw rod 4 rises, the transverse beam 2 is inserted and then rotates clockwise, the transverse beam 2 is clamped by the clamping block 5, two ends of the transverse beam 2 are fixed by the clamp, and the longitudinal beam 1 only generates vertical bending vibration under the action of a vibration exciter during an experiment; the supporting seat 6 fixes the clamp and the module bottom plate 9 through the fixing bolt 7, and the module bottom plate 9 is provided with holes at equal intervals along the direction of each transverse beam 2, so that the clamp can be moved and fixed at different positions on the transverse beam 2.
As shown in fig. 1(a) and 1(b), when hull plate frames with different beam distances need to be measured, only the transverse beams 2 and the clamps need to be rearranged, so that the transverse beams 2 penetrate through the longitudinal beams 1 at a certain interval L, and then the clamp supporting seat 6 and the module bottom plate 9 are fixed by using the fixing bolts 7 again;
as shown in fig. 2(a), fig. 2(b), fig. 3(a) and fig. 3(b), when the ship hull plate frame with different rigidity needs to be measured, only the clamping block 5 needs to be replaced, the clamp with the flat clamping block 5 can provide a fixing and supporting boundary, the clamping block 5 can be detached and replaced into a semi-cylinder shape, the arc-shaped cylindrical surface of the clamping block can provide a simple supporting boundary, or the distance d between the clamp and the middle point of the transverse beam 2 is changed, the clamp is installed at different positions on the transverse beam 2, and then the clamp supporting seat 6 is fixed with the bottom plate 9 by the fixing bolt 7.
The longitudinal beam 1 and the transverse beam 2 have various sizes, and the longitudinal beam 1 and the transverse beam 2 with different section sizes and lengths can be replaced, so that different artificial periodic ship hull beam structures can be measured. After arrangement, excitation force can be input at one end of the longitudinal beam 1 through a vibration exciter to enable the longitudinal beam to generate vertical bending vibration, a plurality of acceleration sensors are arranged on the longitudinal beam 1 to transmit data to a host, and finally, data are processed through computer noise analysis software to obtain an acceleration frequency response curve and the fluctuation characteristic of the structure is analyzed.
In conclusion, the invention utilizes the holes periodically opened on the longitudinal beam 1 and the bottom plate to conveniently adjust the distance between the cross beams and the boundary conditions so as to change the parameters of the artificial periodic beam, such as the mass, the rigidity and the like of the spring mass vibrator; the invention has the characteristics that the purpose of testing the fluctuation characteristics of different periodic structures can be realized without processing and manufacturing each measured beam or plate frame, and the structure is simple and reliable.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
The invention discloses a manual periodic hull beam fluctuation characteristic test device which at least comprises longitudinal I-beams with holes at equal intervals, transverse beams 2, a clamp, a module bottom plate 9 and the like, wherein the clamp comprises a rotary handle 3, a screw rod 4, a clamping block 5, a supporting seat 6 and the like. The device for measuring the fluctuation characteristics of the hull beam and the plate frame can solve the problem that different models need to be processed when different hull beams and plate frames are tested, is simple in structure and convenient to operate, can simulate the hull beam structure with different rigidity and quality in a manual cycle by adjusting parameters, reduces the cost for manufacturing the models, and facilitates multiple tests.
Claims (6)
1. The utility model provides a test device of test artifical periodic hull roof beam fluctuation characteristic which characterized in that: comprises a longitudinal beam and a module bottom plate; the longitudinal beam is an I-shaped cross section, and I-shaped holes are formed in a web plate of the longitudinal beam at equal intervals; transverse beams are periodically inserted into all or a plurality of I-shaped holes on the longitudinal beam web plate at intervals; the transverse beam and the longitudinal beam are fixed through a clamp; a clamp supporting seat is arranged at the corresponding position of the module bottom plate according to the longitudinal beam opening; the clamps are all installed on the clamp supporting seat.
2. The test device for testing the artificial periodic hull beam fluctuation characteristics according to claim 1, wherein: the clamp comprises a clamping block; the clamping blocks are respectively arranged at the upper end and the lower end of the transverse beam, the lower end clamping block is fixed on the clamp supporting seat through a screw rod, and the upper end clamping block is connected with the rotary handle through the screw rod.
3. The test device for testing the artificial periodic hull beam fluctuation characteristics according to claim 2, wherein: the clamping blocks are flat-head clamping blocks or semi-cylindrical clamping blocks.
4. A test device for testing the wave characteristics of artificial periodic hull beams according to claim 1, 2 or 3, which is characterized in that: the module bottom plate is fixed on the bottom surface, and ballast blocks are arranged on four sides of the module bottom plate.
5. A test device for testing the wave characteristics of artificial periodic hull beams according to claim 1, 2 or 3, which is characterized in that: the cross section parameters of the transverse beam are determined according to the actual ship crossbeam structure, and the scaling relation between the cross section area and the cross section inertia moment is ensured.
6. The test device for testing the artificial periodic hull beam fluctuation characteristics according to claim 4, wherein: the cross section parameters of the transverse beam are determined according to the actual ship crossbeam structure, and the scaling relation between the cross section area and the cross section inertia moment is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910999650.4A CN110615063B (en) | 2019-10-21 | 2019-10-21 | Test device for testing artificial periodic hull beam fluctuation characteristics |
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| CN201910999650.4A CN110615063B (en) | 2019-10-21 | 2019-10-21 | Test device for testing artificial periodic hull beam fluctuation characteristics |
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| CN110615063A true CN110615063A (en) | 2019-12-27 |
| CN110615063B CN110615063B (en) | 2022-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701031A (en) * | 2021-09-23 | 2021-11-26 | 上海海事大学 | Self-balancing device of ship heave measuring equipment |
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Cited By (1)
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| CN113701031A (en) * | 2021-09-23 | 2021-11-26 | 上海海事大学 | Self-balancing device of ship heave measuring equipment |
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| CN110615063B (en) | 2022-01-14 |
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