CN112444370A - Simple flow-induced vibration noise test device based on passive vibration isolation principle - Google Patents
Simple flow-induced vibration noise test device based on passive vibration isolation principle Download PDFInfo
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- CN112444370A CN112444370A CN202011290517.0A CN202011290517A CN112444370A CN 112444370 A CN112444370 A CN 112444370A CN 202011290517 A CN202011290517 A CN 202011290517A CN 112444370 A CN112444370 A CN 112444370A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/043—Allowing translations
- F16M11/045—Allowing translations adapted to left-right translation movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/043—Allowing translations
- F16M11/046—Allowing translations adapted to upward-downward translation movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
- F16M13/02—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
Abstract
The invention provides a simple flow-induced vibration noise test device based on a passive vibration isolation principle, which comprises a trailer, a model control system, a power system and a passive vibration control system, wherein the model control system is connected with the trailer through a pipeline; the trailer comprises a trailer base, trailer wheels, a trailer beam, a slideway and a rectangular opening to form a trailer main body structure; the model control system comprises a motor base, a transmission motor, a speed reducer, a transmission gear, a transmission rack, a hydraulic device, a lifting rod and a slide way; the power system comprises a stepping motor, a motor controller and a motor driver; the passive vibration control system comprises a vibration damping loop and dynamic vibration absorbers, the cantilever beam type dynamic vibration absorbers are respectively fixed at the two ends and the middle of the trailer base through magnets, and the vibration damping loop a is fixed with the trailer base 21; the damping loop b is also fixed to the trailer base 21; the invention has the advantages of simple structure, convenient operation, strong environment adaptability, low vibration, good stability and the like, and has important significance on the flow-induced vibration noise test.
Description
Technical Field
The invention belongs to the field of vibration reduction of ship test devices, and particularly relates to a simple flow-induced vibration noise test device of a towing tank based on a passive vibration isolation principle.
Background
The traditional towing tank is usually provided with a high-power travelling crane and equipment, so that the operation is complex, and the vibration noise response is large; the flow-induced vibration noise test is simple in model, small in size, relatively small in vibration noise magnitude, and large in influence of vibration noise caused by equipment on the flow-induced vibration noise test result. Therefore, the design of the test device with small influence on the ship flow-induced vibration noise model test has important engineering application value.
When the frequency of providing of model dead lever swirl is close with test model's natural frequency, easily resonance takes place, not only can influence the test result, still can cause the instrument and equipment precision of trailer to descend, can arouse the destruction or the inefficacy of structure even, can effectively stagger the vortex frequency of putting and drag model natural frequency through changing cylinder functioning speed and structure diameter to reduce the influence of structural vibration to the experiment. The barrier mechanism of the vibration-resistant mass to the transmission of the vibration waves is as follows: the plane bending wave of the plate caused by excitation is incident to the vibration-proof mass, and the vibration-proof mass has large impedance relative to the plate, so that a part of the bending wave reaching the vibration-proof mass is reflected back, and a part of the bending wave is transmitted through, thereby achieving the purpose of isolating the acoustic vibration; the cantilever beam type dynamic vibration absorber has the advantages that the resonance frequency can be changed along with the change of the position of the mass block, and the natural frequency of the vibration absorber is respectively adjusted to be the same as the natural frequency of an object, so that the vibration of the object is reduced, and therefore, structural vibration can be effectively reduced and the error of a test result can be reduced by adopting the vibration-damping mass square steel and the dynamic vibration absorber.
Through the existing literature and patent search, the research on the current fresh trailer for the test of the flow induced vibration noise mainly includes the following published data similar to the invention: 1. vibration control and damping studies on pool test trailers (2007 engineering master thesis); 2. the design of the towing tank trailer structure scheme (electromechanical engineering 2015 12 months); 3. a front-mounted pool towing test device (application number: CN 201510537809.2).
The document 1 reduces the vibration of the trailer and equipment under low frequency and low amplitude by vibration reduction and vibration isolation schemes such as dynamic vibration absorption, damping vibration absorption, two-stage vibration reduction and the like; and select suitable damping equipment according to operating condition, the mounted position of reasonable selection equipment and model, and then accomplish trailer test system's damping vibration isolation design, nevertheless when experimental model or operating mode change, can not in time adjust trailer and equipment state, have great difference with this patent. Document 2 establishes a simulation model of the trailer, and analyzes the natural frequency of the central side bridge through a finite element to avoid resonance close to the natural frequency of the tested product, but has a high requirement on the vehicle body. Patent 3 has designed a forward type pond drag test device, has improved current trailer and has arranged the bottom formation closed region with the sample in and caused the inconsistent condition of dragging speed and air velocity to reduced experimental error, but not considered the influence of vibration noise to the test result, there is great difference with this patent.
In summary, the published documents and patents at present are different from the present invention, and no professional testing device for testing the flow-induced vibration noise exists at present. Therefore, the simple flow-induced vibration noise test device based on the passive vibration isolation principle is introduced, conditions are provided for testing flow-induced vibration noise, and the simple flow-induced vibration noise test device has the advantages of being simple in structure, convenient to operate, strong in environment adaptability, low in vibration, good in stability and the like, and has important significance for a flow-induced vibration noise test.
Disclosure of Invention
The invention aims to provide a simple flow-induced vibration noise test device based on a passive vibration isolation principle, aiming at the problems of complex structure, difficult operation, high cost and obvious vibration of a towing tank trailer. The device simple structure can study model sound vibration characteristic under the different speeds, reduces the influence of vibration to the experiment simultaneously.
The purpose of the invention is realized as follows:
a simple flow-induced vibration noise test device based on a passive vibration isolation principle comprises a trailer, a model control system, a power system and a passive vibration control system. The trailer comprises a trailer base, trailer wheels, a trailer beam, a slide way and a rectangular opening to form a trailer main body structure, wherein the trailer wheels are fixed on the track through a limiting device; the model control system comprises a motor base, a transmission motor, a speed reducer, a transmission gear, a transmission rack, a hydraulic device, a lifting rod and a slide way, wherein the base is fixed on the trailer through bolts, and the motor and the speed reducer are fixed on the base and are driven through a belt; the motor is driven by a speed reducer through a belt, the speed reducer is connected with a transmission gear, and a gear is meshed with a transmission rack; the upper end of the hydraulic device is fixed with the center of the rack, the lower end of the hydraulic device can move left and right in the chute through the sliding block, one end of the lifting rod is connected with the hydraulic device, and the other end of the lifting rod is connected with the towing model; the power system comprises a stepping motor, a motor controller and a motor driver which are all fixed on the right side of the advancing direction of the trailer, and the velocimeter is fixed on the left side of the advancing direction of the trailer; the passive vibration control system comprises a vibration damping loop and a dynamic vibration absorber, the cantilever beam type dynamic vibration absorbers are respectively fixed at the two ends and the middle of the trailer base through magnets, and the vibration damping loop a is fixed with the trailer base 21 and mainly used for isolating vibration waves of a transmission motor; the vibration damping loop b is also fixed with the trailer base 21 and mainly used for isolating vibration waves of the trailer stepping motor; the data acquisition system can acquire test data in real time and is fixed on the left side of the forward direction of the trailer.
The object of the invention is further achieved by the following technical measures.
The simple flow-induced vibration noise test device based on the passive vibration isolation principle is characterized in that the trailer beam is used for reinforcing a trailer structure, and the structural stability is improved.
According to the simple flow-induced vibration noise test device based on the passive vibration isolation principle, the trailer wheels are fixed on the track through the limiting devices, and the trailer can be kept stable in the operation process.
According to the simple flow-induced vibration noise test device based on the passive vibration isolation principle, the data acquisition system can acquire data in real time, the test efficiency is improved, and the labor force is liberated.
In the simple flow-induced vibration noise test device based on the passive vibration isolation principle, the model control system consists of a motor base, a transmission motor, a speed reducer, a transmission gear, a transmission rack, a hydraulic device, a lifting rod and a slide way, and the speed reducer is controlled by the motor to drive the gear to drive the controllable ship model to move transversely; the hydraulic device controls the vertical movement of the lifting rod, and the lower end of the lifting rod is connected with the test model; trailer step motor, tachymeter, driver and controller can real-time supervision and control trailer running state to accurate control test model speed realizes the six degree of freedom motion of model, carries out the flow induced vibration noise test.
In the simple flow-induced vibration noise test device based on the passive vibration isolation principle, the change of the diameter of the lifting rod can change the impedance characteristic of the lifting rod, so that impedance mismatch is caused, and the transmission of vibration energy along the lifting rod is reduced to a certain extent.
In the simple flow-induced vibration noise test device based on the passive vibration isolation principle, the stepping motor controller adjusts the rotating speed of the stepping motor and controls the running speed of the trailer; if the required speed of the test is constant, the diameter of the lifting rod is changed to ensure that the vortex distribution frequency f of the lifting rodsMop with handleDrag model natural frequency fnAnd in addition, resonance is avoided, and test errors are reduced.
In the simple flow-induced vibration noise test device based on the passive vibration isolation principle, the square steel is used for forming a rectangular mass loop around the motor to form isolation of vibration waves, so that vibration transmission is reduced;
the simple flow-induced vibration noise test device based on the passive vibration isolation principle is characterized in that the dynamic vibration absorber is mounted on the trailer base in a distributed mode based on the dynamic vibration absorption principle, so that structural vibration response is reduced, and test errors are reduced.
Compared with the prior art, the invention has the beneficial effects that:
a novel simple flow-induced vibration noise test device is provided; the six-degree-of-freedom motion of the model is realized through a trailer, a transmission device and a hydraulic device; the rotating speed of the stepping motor is adjusted through the controller to control the running speed of the trailer; if the required speed of the test is constant, the diameter of the lifting rod is changed to ensure that the vortex distribution frequency f of the lifting rodsAnd natural frequency f of test modelnDifferent, avoid resonance, reduce the error of the test; a rectangular mass loop is formed around the motor by using square steel to form isolation of vibration waves, so that vibration transmission is reduced; meanwhile, based on the dynamic vibration absorption principle, the simple dynamic vibration absorption device is installed, the structural vibration response is reduced, and the test error is reduced. The invention has the advantages of simple structure, convenient operation, strong environment adaptability, low vibration, good stability and the like, and has important significance on the flow-induced vibration noise test.
Drawings
FIG. 1 is a perspective view of a simple flow-induced vibration noise test device based on a passive vibration isolation principle;
FIG. 2 is a schematic diagram of the simple flow-induced vibration noise testing device based on the passive vibration isolation principle;
FIG. 3 is a schematic view of a model drive train;
FIG. 4 is a partial enlarged view of the vibration damping loop;
fig. 5 is a partially enlarged view of the dynamic vibration absorbing apparatus;
figure 6 is a schematic view of a trailer skid and rectangular openings.
Wherein: 1. a trailer beam; 2. a base; 3. a drive motor; 4. a speed reducer; 5. a transmission gear; 6. a drive rack; 7. a vibration damping loop a; 8. a velocimeter; 9. a dynamic vibration absorber; 10. a wheel; 11. a data acquisition system; 12. a hydraulic device; 13. a lifting rod; 14. a model; 15. a slideway; 16. rectangular holes are formed; 17. a motor controller; 18. a stepping motor; 19. a motor driver; 20. a vibration damping loop b; 21. a base.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
1) The simple flow-induced vibration noise test device based on the passive vibration isolation principle of the present invention is described in detail by taking a towing tank with a length of 100m and a width of 7m as an example with reference to fig. 1. The test device of the invention has the length of 4.5m, the width of 7m and the height of 2m, and consists of a trailer, a model control system and a power system. The trailer beam 1, the trailer wheels 10 and the trailer base 21 form a trailer main body structure; the model control system comprises a motor base 2, a transmission motor 3, a speed reducer 4, a transmission gear 5, a transmission rack 6, a hydraulic device 12 and a three-stage lifting rod 13, wherein the transmission motor 3 and the speed reducer 4 are in belt transmission, the transmission gear 5 is meshed with the transmission rack 6 through a gear, the transmission motor 3 controls the speed reducer 4 to drive the gear to drive the controllable ship model to move transversely, the upper end of the hydraulic device 12 is fixed in the middle of the rack, the lower end of the hydraulic device can move left and right in a slideway 15 through a sliding block, the upper end of the lifting rod 13 is connected with the hydraulic device, the lower end of the lifting rod is connected with a test model 14, and the hydraulic device 12 controls the; the trailer stepping motor 18, the speedometer 8, the motor driver 19 and the motor controller 17 can monitor and control the running state of the trailer in real time, so that the ship model speed can be accurately controlled, and a flow-induced vibration noise test can be carried out; the cantilever beam type dynamic vibration absorber 9 is fixed on the trailer base through a magnet, and a vibration damping loop a is fixed with the trailer base 21 and mainly used for isolating vibration waves of a transmission motor; the damping loop b is also fixed with the trailer base 21, mainly isolates the vibration wave of the trailer stepping motor, and reduces the influence on the test result.
2) The device controls the running speed of the trailer by adjusting the rotating speed of a stepping motor 18 through a controller 17; if the required speed of the test is constant, the diameter of the lifting rod 13 is changed, so that the vortex dispensing frequency of the lifting rod is different from the inherent frequency of the test model 14, resonance is avoided, and the test error is reduced; rectangular square steel loops a and b are formed around the motor by using square steel to form isolation of vibration waves, so that vibration transmission is reduced; meanwhile, the cantilever beam type dynamic vibration absorber 9 is used for absorbing structural vibration response, and test errors are reduced.
3) According to the design requirement, the simple flow-induced vibration noise test device based on the passive vibration isolation principle has the following specific dimensions: the trailer beam 1 is made of square steel and has the size of 0.08 m; the inner diameter of the trailer wheel 10 is 0.35m, and the outer diameter of the limiting wheel is 0.5 m; the thickness of the trailer base 21 is 0.1m, a rectangular opening 16 with the length of 4m multiplied by the width of 0.2m and two slideways 15 with the length of 4m multiplied by the width of 0.05m multiplied by the height of 0.05m are arranged in the center of the base; the transmission motor base 2 is a structure with the length of 1m, the width of 0.4m and the height of 0.42 m; the height of the velocimeter 8 is 0.4 m; the rated power of the trailer stepping motor 18 is 5kw, and the output current of the motor driver 19 is 0.9A-3A; the rated power of the transmission motor 3 is 2 kw; the speed reducer 4 is a two-stage speed reducer, and the transmission ratio is 10; the transmission gear 5 has an outer diameter of about 0.4 m; the transmission rack 6 is fixed with the hydraulic device 12, the length of the rack is 4m, the thickness of the rack is 0.05m, the diameter of the hydraulic device 12 is 0.4m, the height of the hydraulic device is 0.42m, and two sliding blocks are fixed at the bottom of the hydraulic device and slide in the slideway 15; the lifting rod 13 is provided with 3 levels of lifting, the length of each level is 0.5m, the diameter of the 1 level rod is 0.35m, the diameter of the 2 level rod is 0.30m, and the diameter of the 3 level rod is 0.25 m; the diameter of a base disc of the cantilever beam type dynamic vibration absorber 9 is 0.1m magnet, the size of a steel cantilever beam is 0.32m long, 0.03m wide and 0.015m high, and a steel mass block is a cube with the side length of 0.4 m; the vibration damping loop a is 0.05m square steel, and the size is 4.2m in length and 1m in width; the vibration damping loop b is 0.05m square steel, and the size is 1.5m in length and 0.66m in width; the test model 14 is a special ship model or an underwater vehicle for flow-induced vibration noise, and the weight can reach 50 kg.
The device of the invention specifically works as follows:
1) after the trailer is installed on a towing tank track, a test model is fixed, the hydraulic device controls the vertical position of the test model by controlling the vertical movement of the lifting rod, and the motor controls the speed reducer to drive the gear to drive the controllable test model to move transversely so that the test model reaches the designated position;
2) before the flow-induced vibration noise test is started, the inherent frequency of the trailer main body structure is measured through simulation or test, and the inherent frequency of the dynamic vibration absorber is adjusted to be the same as the frequency, so that the vibration response of the main body structure is absorbed; meanwhile, the first order natural frequency of the flow-induced vibration noise test model is obtained through simulation or test means, during the flow-induced vibration noise test, the running speed of the trailer is tested through a velocimeter and fed back to a control system, and the running speed of the trailer is controlled by adjusting the rotating speed of a stepping motor through a controller; if the required speed of the test is constant, the diameter of the lifting rod is changed to ensure that the vortex distribution frequency f of the lifting rodsAnd drag model natural frequency fnDifferent, avoid producing resonance, reduce the error of the test; data are collected in real time through the data collection system during the test, and the device is fixed on one side of the water pool after the test is finished.
Claims (9)
1. A simple flow-induced vibration noise test device based on a passive vibration isolation principle is characterized by comprising a trailer, a model control system, a power system and a passive vibration control system; the trailer comprises a trailer base, trailer wheels, a trailer beam, a slide way and a rectangular opening to form a trailer main body structure, wherein the trailer wheels are fixed on the track through a limiting device; the model control system comprises a motor base, a transmission motor, a speed reducer, a transmission gear, a transmission rack, a hydraulic device, a lifting rod and a slide way, wherein the base is fixed on the trailer through bolts, and the motor and the speed reducer are fixed on the base and are driven through a belt; the motor is driven by a speed reducer through a belt, the speed reducer is connected with a transmission gear, and a gear is meshed with a transmission rack; the upper end of the hydraulic device is fixed with the center of the rack, the lower end of the hydraulic device can move left and right in the chute through the sliding block, one end of the lifting rod is connected with the hydraulic device, and the other end of the lifting rod is connected with the towing model; the power system comprises a stepping motor, a motor controller and a motor driver which are all fixed on the right side of the advancing direction of the trailer, and the velocimeter is fixed on the left side of the advancing direction of the trailer; the passive vibration control system comprises a vibration damping loop and a dynamic vibration absorber, the cantilever beam type dynamic vibration absorbers are respectively fixed at the two ends and the middle of the trailer base through magnets, and the vibration damping loop a is fixed with the trailer base 21 and mainly used for isolating vibration waves of a transmission motor; the vibration damping loop b is also fixed with the trailer base 21 and mainly used for isolating vibration waves of the trailer stepping motor; still include data acquisition system, data acquisition system can gather experimental data in real time, fixes on trailer direction of advance left side.
2. The simple flow-induced vibration noise test device based on the passive vibration isolation principle of claim 1, wherein the trailer beam is used for reinforcing a trailer structure and improving the structural stability.
3. The simple flow-induced vibration noise test device based on the passive vibration isolation principle as claimed in claim 1, wherein the trailer wheels are fixed on the track through a limiting device, so that the trailer can be kept stable in the running process.
4. The simple flow-induced vibration noise test device based on the passive vibration isolation principle as claimed in claim 1, wherein the data acquisition system can acquire data in real time, so that the test efficiency is improved, and the labor force is liberated.
5. The simple flow-induced vibration noise test device based on the passive vibration isolation principle as claimed in claim 1, wherein the model control system is composed of a motor base, a transmission motor, a speed reducer, a transmission gear, a transmission rack, a hydraulic device, a lifting rod and a slide way, and the speed reducer is controlled by the motor to drive a gear to drive a controllable ship model to move transversely; the hydraulic device controls the vertical movement of the lifting rod, and the lower end of the lifting rod is connected with the test model; trailer step motor, tachymeter, driver and controller can real-time supervision and control trailer running state to accurate control test model speed realizes the six degree of freedom motion of model, carries out the flow induced vibration noise test.
6. The simple flow-induced vibration noise test device based on the passive vibration isolation principle as claimed in claim 1, wherein the change of the diameter of the lifting rod can change the impedance characteristic thereof, so as to cause impedance mismatch and reduce the transmission of vibration energy along the lifting rod to a certain extent.
7. The simple flow-induced vibration noise test device based on the passive vibration isolation principle as claimed in claim 1, wherein the stepping motor controller adjusts the rotating speed of the stepping motor to control the running speed of the trailer; if the required speed of the test is constant, the diameter of the lifting rod is changed to ensure that the vortex distribution frequency f of the lifting rodsAnd drag model natural frequency fnAnd in addition, resonance is avoided, and test errors are reduced.
8. The simple flow-induced vibration noise test device based on the passive vibration isolation principle as claimed in claim 1, wherein a rectangular mass loop is formed around the motor by using square steel to form vibration wave isolation, so that vibration transmission is reduced.
9. The simple flow-induced vibration noise test device based on the passive vibration isolation principle as claimed in claim 1, wherein the dynamic vibration absorber is based on the dynamic vibration absorption principle, and the simple cantilever beam type dynamic vibration absorption device is installed on the trailer base in a distributed manner, so that the structural vibration response is reduced, and the test error is reduced.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654762A (en) * | 2021-09-08 | 2021-11-16 | 天津理工大学 | Water tank towing system with rotary lifting mechanism |
| CN113984331A (en) * | 2021-10-12 | 2022-01-28 | 哈尔滨工程大学 | Low-noise externally-driven intelligent flow excitation test device and test method |
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