CN103033314B - Torsion calibration method for measurement beam used for ship model wave load test - Google Patents
Torsion calibration method for measurement beam used for ship model wave load test Download PDFInfo
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- CN103033314B CN103033314B CN201210564892.9A CN201210564892A CN103033314B CN 103033314 B CN103033314 B CN 103033314B CN 201210564892 A CN201210564892 A CN 201210564892A CN 103033314 B CN103033314 B CN 103033314B
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- ship model
- measurement beam
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Abstract
The invention provides a torsion calibration device for a measurement beam used for a ship model wave load test. The torsion calibration device for the measurement beam used for the ship model wave load test comprises a measurement beam. A beam surface of a measurement profile of the measurement beam is provided with a foil gage. One end of the measurement beam is fixed on a support, and the other end of the measurement beam is fixedly connected with a rod piece. The rod piece is vertical to the axis of the measurement beam. A tray is hung on one end of the rod piece through steel wire ropes, and weights can be placed on the tray. The distance between one end of the rod piece and a hanging end is equal to the distance between the other end of the rod piece and the hanging end. The torsion calibration device for the measurement beam used for the ship model wave load test provides a torsion calibration method for a measurement beam used for a ship model wave load test. According to the torsion calibration method for the measurement beam used for the ship model wave load test, by independently conducting gradation loading and weight unloading on two ends of the rod piece, the strain of each measurement profile is collected, fitting coefficients of the weight acting force and the strain are obtained, and a coefficient factor of the strain of each measurement profile of the measurement beam and a torsion in the wave load which is actually suffered by each measurement profile of the ship model is counted. The coefficient factor between the strain of each measurement profile of the measurement beam and a torsion in the sea load which is actually suffered by each measurement profile of the ship model can be demarcated through the torsion calibration device and the method for the measurement beam used for the ship model wave load test.
Description
Technical field
The present invention relates to sectional type ship model wave load technical field of measurement and test, be specifically related to for measure on beam each measure section strain and ship model respectively measure the method that the relation between seaway load that section suffers demarcates, particularly relate to and respectively measure the strain of section and ship model and respectively measure to measuring beam the method that the relation between the actual moment of torsion suffered of section demarcates.
Background technology
Seaway load test macro is mainly used in measuring wave shearing, moment of flexure, moment of torsion and slamming pressure, relate to ship model its structural design and Design of Test System two aspect, present stage mainly comprises continuous type ship model, sectional type ship model and integral, flexible ship model these three kinds for the ship model structural design tested, and wherein, the design of sectional type ship model more can be applicable to the test objective of seaway load.Carry out in the method for seaway load test utilizing sectional type model, resistance or seakeeping test model can be utilized, disconnect at the transverse section place for measuring wave bending moment, and each segmentation of the longitudinal segmentation of ship model is firmly connected with the metal of certain bending stiffness measurement beam, by foil gauge that the beams of metal corresponding with ship model segmentation otch is pasted and external strain instrument, the moment of flexure that this suffers in wave by ship model reflects with the form of strain, then calculates wave bending moment and moment of torsion by series of computation formula.Above-mentioned method of testing respectively measures between the actual seaway load suffered of section based on the strain that beams of metal measures and ship model to there is certain corresponding relation, therefore before test, be about to measure before beam is installed to ship model tests, need to determine that the corresponding relation coefficient of the actual seaway load suffered of section respectively measured by the strain of each measurement section and ship model, and at present for determining that the apparatus and method of described corresponding relation coefficient also exist very large research space.
Summary of the invention
The applicant improves for above-mentioned shortcoming of the prior art, there is provided a kind of torque calibration method of measurement beam for ship model wave load test, it can be demarcated measuring the coefficient of relationship that beam respectively measures between moment of torsion that the strain of section and ship model respectively measure in the actual seaway load suffered of section.
Technical scheme of the present invention is as follows:
The torque calibrating device of the measurement beam for ship model wave load test of the present invention, comprise measurement beam, the beam measuring the measurement section place of beam is provided with foil gauge on the surface, measuring beam one end is fixed on support, the other end is connected with rod member, rod member and the axes normal measuring beam, and there is pallet one end of rod member by steel wire hang, pallet can place counterweight, and rod member two ends are equal with the distance of described suspended end.
Its further technical scheme is:
Described measurement beam is round metal tube.
Described foil gauge is uniform with 90 ° along the beam surface measuring beam measurement section place, and on measurement section, four corresponding foil gauges are that full-bridge connects.
The torque calibration method of the measurement beam for ship model wave load test of the present invention, comprises following steps:
The first step, the measurement beam one end being pasted with foil gauge is fixed on support, makes the foil gauge in measurement section radial direction and the vertical diameter layout at 45 ° measuring section, in one end of rod member by steel wire hang pallet, make i represent measurement section, make L represent the length of rod member;
Second step, on pallet after hierarchical loading counterweight, then load shedding counterweight, the strain output U that beam respectively measures section is measured in application external dynamic strainmeter and computer control system collection
i0, U
i1..., U
im, m is total progression of compression and decompression;
3rd step, repetition second step, on pallet, namely repeat hierarchical loading, unload counterweight also collection strain output data, operate n time, then each the measurement section measuring beam all obtains the strain output data of large group of corresponding n;
4th step, to the data analysis gathered in second step and the 3rd step, first to measure beam each measure section large group of n counterweight acting force and strain export data adopt least square method to carry out matching respectively, then each measure section can obtain n fitting coefficient Ft
1i, Ft
2i..., Ft
ni;
5th step, is suspended on the other end of rod member by the wire rope in the first step and pallet, repeat second step and the 3rd step, then each the measurement section measuring beam all obtains the strain output data of large group of other n;
6th step, to the data analysis gathered in the 5th step, first to measure beam each measure section large group of other n counterweight acting force and strain export data adopt least square method to carry out matching respectively, then each measure section can obtain other n fitting coefficient Ft
1i＇, Ft
2i＇ ..., Ft
ni＇;
7th step, the fitting coefficient obtained by the 4th step and the 6th step and the length L of rod member calculate the moment of torsion Mt of each areal survey section of sectional type ship model
icalibration coefficient Ct
i, i.e. Ct
i=[(Ft
1i-Ft
1i＇)+(Ft
2i-Ft
2i＇)+... + (Ft
ni-Ft
ni＇)] * L/n.
Its further technical scheme is:
From described second step to the 3rd step, the frequency n altogether operated is at least three times.
Technique effect of the present invention:
The present invention can realize demarcating measuring the coefficient of relationship that beam respectively measures between moment of torsion that the strain of section and ship model respectively measure in the actual seaway load suffered of section, and structure is simple, easy to operate.
Accompanying drawing explanation
Fig. 1 is sectional type ship model and the assembling schematic diagram measuring beam.
Fig. 2 is the easy structure schematic diagram of the torque calibrating device of the measurement beam for ship model wave load test of the present invention.
Fig. 3 measures the measurement section of beam and the layout schematic diagram of foil gauge.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
Before the strain-bending moment coefficients measuring beam 1 each measurement section 7 is demarcated, the position of each measurement section 7 measuring beam 1 first accurately will be oriented according to the areal survey profile position of sectional type ship model 9, namely the measurement section 7 measuring beam 1 is corresponding with the areal survey section of sectional type ship model 9, see Fig. 1, Fig. 1 is sectional type ship model 9 and the assembling schematic diagram measuring beam 1, in figure, ship model 9 is divided into 4 sections, pedestal 10 is rigidly fixed by each connection segment of ship model 9 below beam 1 by measuring, and measure each measurement section 7 of beam 1 and each areal survey profile position one_to_one corresponding of sectional type ship model 9.
See Fig. 2, the torque calibrating device of the measurement beam for ship model wave load test of the present invention, comprise and measure beam 1, the beam measuring measurement section 7 place of beam 1 is provided with foil gauge 2 on the surface, and measure beam 1 one end fixed by snap on support 3, the other end is connected with rod member 8, rod member 8 and the axes normal measuring beam 1, one end of rod member 8 is hung with pallet 5 by wire rope 4, and pallet 5 can place counterweight 6, and the two ends of rod member 8 are equal with the distance of described suspended end.
Preferably, measurement beam 1 is round metal tube, sees Fig. 3, and the beam surface that foil gauge 2 measures section 7 place along measurement beam 1 is uniform with 90 °, and four foil gauges 2 measuring correspondence on section 7 are full-bridge connection.
Timing signal is carried out when needing the moment of torsion Mt to measuring beam 1, described caliberating device needs use twice, namely the two ends of rod member 8 all will as the suspended end of wire rope 4 and pallet 5, and the two ends of rod member 8 can not simultaneously as suspended end, but successively order is independent of suspended end.
The torque calibration method of the measurement beam for ship model wave load test of the present invention comprises following steps:
The first step, measurement beam 1 one end being pasted with foil gauge 2 is fixed on support 3, makes the foil gauge 2 in measurement section 7 radial direction and the vertical diameter layout at 45 ° measuring section 7, hang pallet 5 in one end of rod member 8 by wire rope 4, make i represent and measure section 7, make L represent the length of rod member 8;
Second step, on pallet 5 after hierarchical loading counterweight 6, then load shedding counterweight 6, the strain output U that beam 1 respectively measures section 7 is measured in application external dynamic strainmeter and computer control system collection
i0, U
i1..., U
im, m is total progression of compression and decompression;
3rd step, repetition second step, namely repeats hierarchical loading, unloading counterweight 6 also collection strain output data, operates n time on pallet 5, then each the measurement section 7 measuring beam 1 all obtains the strain output data of large group of corresponding n;
4th step, to the data analysis gathered in second step and the 3rd step, first to measure beam 1 each measure section 7 large group of n counterweight acting force and strain export data adopt least square method to carry out matching respectively, then each measure section 7 can obtain n fitting coefficient Ft
1i, Ft
2i..., Ft
ni, Ft
nifor the fitting coefficient that counterweight acting force exports with strain;
5th step, is suspended on the other end of rod member 8 by the wire rope 4 in the first step and pallet 5, repeat second step and the 3rd step, then each the measurement section 7 measuring beam 1 all obtains the strain output data of large group of other n;
6th step, to the data analysis gathered in the 5th step, first to measure beam 1 each measure section 7 large group of other n counterweight acting force and strain export data adopt least square method to carry out matching respectively, then each measure section 7 can obtain other n fitting coefficient Ft
1i＇, Ft
2i＇ ..., Ft
ni＇;
7th step, the fitting coefficient obtained by the 4th step and the 6th step and the length L of rod member 8 calculate the moment of torsion Mt of each areal survey section of sectional type ship model 9
icalibration coefficient Ct
i, i.e. Ct
i=[(Ft
1i-Ft
1i＇)+(Ft
2i-Ft
2i＇)+... + (Ft
ni-Ft
ni＇)] * L/n.
Particularly, from described second step to the 3rd step, the frequency n altogether operated is at least three times, the total number of operations namely load, unloaded at least three times.
The present invention can realize demarcating measuring each coefficient of relationship measured between the strain of section 7 and each moment of torsion measured in the actual seaway load suffered of section of ship model 9 of beam 1, and structure is simple, easy to operate.
More than describing is explanation of the invention, and be not the restriction to invention, limited range of the present invention, see claim, within protection scope of the present invention, can do any type of amendment.
Claims (2)
1. the torque calibration method of measurement beam for ship model wave load test, is characterized in that, comprises following steps:
The first step, measurement beam (1) one end being pasted with foil gauge (2) is fixed on support (3), make the foil gauge (2) in measurement section (7) radial direction and the vertical diameter layout at 45 ° measuring section (7), pallet (5) is hung by wire rope (4) in one end of rod member (8), make i represent and measure section (7), make L represent the length of rod member (8);
Second step, after the upper hierarchical loading counterweight (6) of pallet (5), then load shedding counterweight (6), the strain output U that beam (1) respectively measures section (7) is measured in application external dynamic strainmeter and computer control system collection
i0, U
i1..., U
im, m is total progression of compression and decompression;
3rd step, repetition second step, namely repeats hierarchical loading, unloads counterweight (6) and gathers strain to export data, operate n time on pallet (5), then each measurement section (7) of measuring beam (1) all obtains the strain output data of large group of corresponding n;
4th step, to the data analysis gathered in second step and the 3rd step, first to measure beam (1) each measure section (7) large group of n counterweight acting force and strain export data adopt least square method to carry out matching respectively, then each measure section (7) n fitting coefficient Ft can be obtained
1i, Ft
2i..., Ft
ni;
5th step, is suspended on the other end of rod member (8) by the wire rope (4) in the first step and pallet (5), repeat second step and the 3rd step, then each measurement section (7) of measuring beam (1) all obtains the strain output data of large group of other n;
6th step, to the data analysis gathered in the 5th step, first to measure beam (1) each measure section (7) large group of other n counterweight acting force and strain export data adopt least square method to carry out matching respectively, then each measure section (7) other n fitting coefficient Ft can be obtained
1i＇, Ft
2i＇ ..., Ft
ni＇;
7th step, the fitting coefficient obtained by the 4th step and the 6th step and the length L of rod member (8) calculate the moment of torsion Mt of each areal survey section of sectional type ship model (9)
icalibration coefficient Ct
i, i.e. Ct
i=[(Ft
1i-Ft
1i＇)+(Ft
2i-Ft
2i＇)+... + (Ft
ni-Ft
ni＇)] * L/n.
2., by the torque calibration method of measurement beam for ship model wave load test according to claim 1, be characterised in that: from described second step to the 3rd step, the frequency n altogether operated is at least three times.
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|---|---|---|---|
| CN201210564892.9A CN103033314B (en) | 2012-12-24 | 2012-12-24 | Torsion calibration method for measurement beam used for ship model wave load test |
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|---|---|---|---|
| CN201210564892.9A CN103033314B (en) | 2012-12-24 | 2012-12-24 | Torsion calibration method for measurement beam used for ship model wave load test |
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| CN103033314B true CN103033314B (en) | 2015-05-20 |
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Cited By (1)
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| CN106546408A (en) * | 2016-11-04 | 2017-03-29 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Ship wave loads test measurement beam caliberating device |
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Effective date of registration: 20151207 Address after: 100097 Beijing, Kunming, Hunan Road, Haidian District No. 72 Patentee after: csic Address before: 214082 Wuxi, Jiangsu, Binhu District, Wuxi, box 116 Patentee before: The 702th Research Institute of China Shipbuilding Industry Corporation |
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Address after: 100097 Beijing, Kunming, Hunan Road, Haidian District No. 72 Patentee after: China Shipbuilding Heavy Industry Group Co., Ltd. Address before: 100097 Beijing, Kunming, Hunan Road, Haidian District No. 72 Patentee before: csic |
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Granted publication date: 20150520 Termination date: 20201224 |