Storage tank liquid modal determination device

Abstract

The utility model relates to the technical field of liquid shaking testing equipment, and discloses a storage tank liquid modal testing device, which is characterized in that a support frame is arranged in the middle of a device base, a vibration exciter and a liquid adding and discharging device are respectively arranged on two sides of the support frame, a mobile platform is arranged below the support frame, and a flexible pull rod is arranged at each of four corners of the mobile platform. The upper and lower ends of the flexible pull rod are fixedly connected with the support frame and the mobile platform respectively; the shaft vibration exciter is fixedly connected with the movable platform through a push-pull rod; and an experiment storage box is arranged on the mobile platform and is fixedly connected with the mobile platform through a storage box clamp. The device can achieve diversified simulation of different liquid working conditions and modal characteristics, is compact in size, can be used for various scenes such as laboratories and industrial sites, and has high applicability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid shaking test equipment technical field, specifically relates to a kind of tank liquid modal determination device. BACKGROUND

[0002] Tank is widely used in aerospace, navigation and industrial field, for storing and transporting liquid fuel, chemicals or other fluids. The modal characteristics (such as natural frequency and mode shape) of the liquid in the tank have important influence on its performance and stability in dynamic environment. For example, during the launch of spacecraft, the tank is affected by complex vibration environment, and the coupling between liquid and structure may cause resonance or other nonlinear behavior, which endangers the safety of the tank and system. Therefore, studying the modal characteristics of tank liquid and accurately determining its dynamic response are crucial for engineering design, risk assessment and structure optimization.

[0003] The existing liquid modal determination device may have the following defects in structural design, which will affect the stability of the experiment, the measurement accuracy and the adaptability of the device. Vibration transmission interference: the rigidity of the support structure may not be sufficient, which may cause external vibration to be transmitted to the device, affecting the accuracy of modal determination. Non-uniform sensor arrangement: the sensors may not be evenly distributed or may not cover the key areas, resulting in limitations of measurement data and loss of local information. Difficult to adjust liquid: the liquid tank position is fixed or the liquid circulation pipeline arrangement is not flexible, which may cause difficulty in adjusting the liquid filling amount, limiting the research on different liquid levels and filling ratios. In the prior art, the patent number CN204479132U provides a shaking experiment tank liquid level measuring device, which uses the principle of communicating vessel to accurately control and measure the filling of liquid in the tank, but does not provide a means for measuring the liquid excitation effect. Therefore, the device for measuring the liquid in the tank needs to be optimized. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem to provide a kind of tank liquid modal determination device with simple structure and convenient to use.

[0005] In order to solve the above technical problems, the utility model provides a kind of tank liquid modal determination device, including: device base, support frame is equipped in the middle part of device base, and exciter and liquid discharge device are respectively equipped in the two sides of support frame, and mobile platform is equipped below support frame, and one flexible pull rod is respectively equipped in the four corners of mobile platform, and the upper and lower ends of flexible pull rod are respectively fixedly connected with support frame and mobile platform;

[0006] The shaft exciter is fixedly connected with the mobile platform through the push-pull rod.

[0007] The experimental tank is fixedly connected with the mobile platform through the tank clamping jig.

[0008] As an improvement of the utility model of a kind of storage tank liquid modal determination device:

[0009] The leftmost vertical of the device base is provided with a vibration exciter baffle, and the vibration exciter baffle is fixedly connected with the device base.

[0010] The vibration exciter is fixedly connected with the vibration exciter baffle, and outputs horizontal vibration excitation force to the right side; the vibration exciter is connected with the signal generator through the power amplifier.

[0011] As a further improvement of the utility model of a kind of storage tank liquid modal determination device:

[0012] The experimental storage tank is a transparent cylindrical sealed container, and the bottom is respectively provided with a water outlet and a water inlet, the water inlet is provided with a water inlet check valve, and the water outlet is provided with a water outlet check valve.

[0013] As a further improvement of the utility model of a kind of storage tank liquid modal determination device:

[0014] The upper part of the storage tank clamping fixture is a ring-shaped fixed jaw, and the bottom is a support seat, and the ring-shaped fixed jaw and the support seat are fixedly connected through four supports; the support seat is fixedly connected with the moving platform through the storage tank support disc.

[0015] The lower part of the experimental storage tank is embedded in the ring-shaped fixed jaw.

[0016] As a further improvement of the utility model of a kind of storage tank liquid modal determination device:

[0017] The liquid discharge device comprises a liquid storage tank, and the liquid storage tank is divided into two ways through a self-priming pump and a three-way, and is connected with a water inlet check valve and a water outlet check valve respectively.

[0018] As a further improvement of the utility model of a kind of storage tank liquid modal determination device:

[0019] The liquid storage tank, the self-priming pump, the self-priming pump and the three-way, the three-way and the water inlet check valve, and the three-way and the water outlet check valve are connected through hydraulic hoses and are detachably connected.

[0020] As a further improvement of the utility model of a kind of storage tank liquid modal determination device:

[0021] The moving platform is provided with a displacement sensor and a speed sensor, and the displacement sensor and the speed sensor are fixedly connected with the moving platform.

[0022] The left side and the front side of the device base are respectively provided with a CCD high-speed camera.

[0023] As a further improvement of the utility model of a kind of storage tank liquid modal determination device:

[0024] The hydraulic hose is a nut joint bellows or a quick joint bellows.

[0025] The beneficial effects of the utility model mainly show in:

[0026] The utility model discloses a kind of liquid modal determination devices of storage tank, provide a kind of high-efficiency, stable and widely applicable liquid modal research means, real-time capture the motion characteristics of liquid surface by high-precision CCD camera, improve the visualization effect of modal determination.It is equipped with signal generator and power amplifier, can provide stable excitation signal, ensure the high quality and high accuracy of experimental data.The combination design of self-suction pump and hydraulic hose ensures that liquid can be circulated smoothly between liquid storage tank and experimental storage tank, facilitating adjustment of liquid height or replacement of liquid type.Hydraulic hose reduces the interference of liquid fluctuation to device structure during liquid circulation, improves the vibration stability of device.Support frame provides high-strength, high-rigidity mechanical support, reduces the interference of external vibration to experimental tank body.Flexible pull rod has buffering effect, effectively absorbs external interference vibration, reduces measurement error.By adjusting excitation parameters (such as frequency, amplitude) and liquid circulation conditions, different liquid working conditions and modal characteristics can be simulated diversely.The device is compact in size, can be used in laboratory, industrial site and other various scenes, has strong applicability and popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0027] The specific embodiment of the utility model will be further described in detail below in combination with drawings.

[0028] Figure 1 It is a structure schematic view of the liquid modal determination device of storage tank of the utility model;

[0029] Figure 2 It is a structure schematic view of the clamping fixture of storage tank in Figure 1 ;

[0030] Figure 3 It is a schematic view of experimental storage tank 9 in Figure 1 . DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with specific embodiment, but the protection scope of the utility model is not limited to this:

[0032] Example 1, a kind of liquid modal determination device of storage tank, as shown in Figure 1 , including device base 1, support frame 4, mobile platform 6, experimental storage tank assembly, modal excitation device, measurement unit and liquid addition and discharge device are equipped on device base 1.

[0033] The device base 1 is a metal flat plate for the stability and support of the entire measuring device. The rigid support frame 4 is located in the middle of the device base 1, and the modal excitation device and the liquid discharge device are respectively located on the left and right sides of the support frame 4. The support frame 4 is a rigid frame structure, and a moving platform 6 is arranged below. The moving platform 6 is a rigid platform made of a metal plate, which is used to support and fix the experimental tank assembly. A flexible pull rod 5 is arranged at each corner of the moving platform 6, and the upper and lower ends of the flexible pull rod 5 are respectively fixedly connected with the upper prism of the support frame 4 and the moving platform 6, so that the moving platform 6 is suspended below the support frame 4 and can maintain suspended stability.

[0034] The modal excitation device includes an exciter baffle 33, an exciter 30, a signal generator 31 and a power amplifier 32. The exciter baffle 33 is vertically arranged at the leftmost side of the device base 1 and is fixedly connected with the device base 1. The exciter 30 is fixedly connected with the device base 1 through the exciter baffle 33 and outputs horizontal excitation force to the right side. The signal generator 31 is signal connected with the exciter 30 through the power amplifier 32. The signal generator 31 is connected with the power amplifier 32 to input signals from a computer, and the power amplifier 32 is signal connected with the exciter to output excitation force by adjusting different excitation accelerations to realize excitation of different liquid modal modes.

[0035] The output shaft of the exciter 30 is connected with the moving platform 6 through a push-pull rod 2, i.e. the two ends of the push-pull rod 2 are fixedly connected with the output shaft of the exciter 30 and the middle part of the left side of the moving platform 6. The push-pull rod 2 is a rigid metal rod, and the vibration of the exciter 30 is transmitted to the moving platform 6 through the push-pull rod 2. Since the moving platform 6 is suspended below the support frame 4 through the flexible pull rod 5, the moving platform 6 performs back-and-forth reciprocating motion. The flexible pull rod 5 has certain elasticity and flexibility, which can effectively absorb the slight vibration transmitted to the device in the environment and reduce the influence of external interference on the experimental results. Especially under high-frequency or large-amplitude excitation conditions, it helps to reduce stress concentration and deformation distortion in the system. It can play a buffering role when the device is subjected to transient impact or vibration, and protect the precision components such as sensors and exciters from damage.

[0036] The experimental tank assembly includes an experimental tank 9, a tank clamping fixture and a tank supporting disc 11. The tank clamping fixture is like Figure 2As shown, the upper part is a ring-shaped fixed jaw 100, the bottom part is a support seat 102, and the ring-shaped fixed jaw 100 and the support seat 102 are fixedly connected by four supports 101. The ring-shaped fixed jaw 100 is a ring-shaped metal ring, and the inner wall of the ring-shaped fixed jaw 100 is provided with a flexible pad to increase the friction and avoid damage to the surface of the experimental storage tank 9. The inner diameter of the ring-shaped fixed jaw 100 is in a tolerance fit with the diameter of the experimental storage tank 9, so that the lower part of the experimental storage tank 9 can be embedded in the ring-shaped fixed jaw 100, and the experimental storage tank 9 can be fixed in the ring-shaped fixed jaw 100 without deviation.

[0037] The experimental storage tank 9 is a cylindrical sealed container made of organic glass, as shown in the figure. Figure 3 As shown, the top and bottom are both arc-shaped, which facilitates embedding in the ring-shaped fixed jaw 100. An outlet and an inlet are respectively provided at the bottom of the experimental storage tank 9, the inlet is provided with a water inlet one-way valve 84 with a switch, and the outlet is provided with a water outlet one-way valve 85 with a switch, to control the water inlet and outlet of the experimental storage tank 9, respectively.

[0038] The support seat 102 is fixedly connected with the storage tank supporting disc 11 by bolts, and the storage tank supporting disc 11 is fixedly connected with the moving platform 6 by bolts, so that the experimental storage tank 9 can be fixedly connected with the moving platform 6 through the storage tank clamping device, the storage tank supporting disc 11, and the moving platform 6, and the experimental storage tank 9 can be moved back and forth with the moving platform 6, so that the liquid in the experimental storage tank 9 can be excited and shaken, and the shaking mode of the liquid can be obtained.

[0039] The liquid discharging device includes a liquid storage tank 80, a self-priming pump 81, a three-way valve 82, and a hydraulic hose 83. The liquid storage tank 80 is connected with the three-way valve 82 through the self-priming pump 81, and then divided into two paths, which are respectively connected with the water inlet one-way valve 84 and the water outlet one-way valve 85 of the experimental storage tank 9. The liquid storage tank 80, the self-priming pump 81, the self-priming pump 81, the three-way valve 82, the water inlet one-way valve 84, and the water outlet one-way valve 85 are all connected by the hydraulic hose 83, and are all detachably connected (for example, using a buckle type quick connector or a threaded connection), which reduces the disturbance of liquid fluctuation to the structure of the device during liquid circulation, and improves the vibration stability of the device. The hydraulic hose 83 can be a nut joint corrugated pipe or a quick connector corrugated pipe, which can be easily removed after the liquid is filled and the water inlet one-way valve 84 is closed, so that the experimental storage tank 9 can move with the moving platform 6 without being restricted by the hydraulic hose 83.

[0040] When the self-priming pump 81 is running forward, liquid flows out from the liquid storage tank 80, under the pressure pushing of the self-priming pump 81, flows into the experimental storage tank 9 through the three-way pipe 82 and the water inlet check valve 84 (the water outlet check valve 85 is closed). When the self-priming pump 81 is running reversely, liquid flows out from the experimental storage tank 9 (the water inlet of the experimental storage tank 9 is closed due to the action of the water inlet check valve 84), flows back into the liquid storage tank 80 through the water outlet check valve 85, the three-way pipe 82 and the self-priming pump 81, so as to realize automatic liquid filling and draining in the experimental storage tank 9.

[0041] The measuring unit comprises a displacement sensor 20, an acceleration sensor 21 and a CCD high-speed camera 22, the displacement sensor 20 and the acceleration sensor 21 are arranged on the moving platform 6 and fixedly connected with the moving platform 6, the displacement sensor 20 is used for measuring the displacement of the back-and-forth reciprocating motion of the moving platform 6, and the acceleration sensor 21 is used for measuring the acceleration of the back-and-forth reciprocating motion of the moving platform 6.

[0042] The two CCD high-speed cameras 22 are located on the two sides (left side and front side) of the experimental storage tank 9 and are arranged perpendicularly, and are fixedly connected with the device base 1 through support columns. The change process of the liquid surface of the liquid in the experimental storage tank 9 is shot by adding fluorescent dye into the experimental storage tank 9 made of transparent organic glass during the back-and-forth reciprocating motion of the experimental storage tank 9.

[0043] The displacement sensor 20, the acceleration sensor 21 and the CCD high-speed camera 22 are all connected with an external computer through a single-chip microcomputer for signal transmission.

[0044] Use method:

[0045] 1. The water inlet check valve 84 is connected with the three-way pipe 82 through a hydraulic hose 83; the CCD high-speed camera is turned on, the angle, focal length and sampling frequency of the CCD camera are adjusted, and the experimental storage tank 9 is focused.

[0046] 2. The power supply is turned on, the water inlet check valve 84 is opened, and the liquid is filled into the experimental storage tank 9 through the self-priming pump 81.

[0047] 3. After the filling is completed, the water inlet check valve 84 is closed, and the hydraulic hose 83 connected with the water inlet check valve 84 is removed.

[0048] 4. The modal excitation parameters (such as excitation frequency and amplitude) are set on the signal generator 31, the excitation signal is transmitted to the exciter 30 through the power amplifier 32, the excitation force is transmitted to the moving platform 6 through the push-pull rod 2, and the experimental storage tank 9 is excited;

[0049] 5. The two CCD high-speed cameras 22 simultaneously shoot the modal excited by the liquid in the motion process, which is used for further modal analysis.

[0050] Finally, it should be noted that the above list is only a few embodiments of the present application. Obviously, the present application is not limited to the above examples, but can have many variations. All variations that can be directly derived or inferred from the content disclosed in the present application by those of ordinary skill in the art should be considered as falling within the scope of the present application.

Claims

1. A device for determining the modal characteristics of a storage tank liquid, characterized in that: The device includes a base (1), a support frame (4) is provided in the middle of the base (1), a vibrator (30) and a liquid injection and discharge device are provided on both sides of the support frame (4), a moving platform (6) is provided below the support frame (4), and a flexible tie rod (5) is provided at each of the four corners of the moving platform (6). The upper and lower ends of the flexible tie rod (5) are fixedly connected to the support frame (4) and the moving platform (6) respectively. The shaft vibrator (30) is fixedly connected to the moving platform (6) via a push-pull rod (2); The mobile platform (6) is equipped with an experimental storage tank (9), which is fixedly connected to the mobile platform (6) through a storage tank clamp.

2. The tank liquid modal measuring device according to claim 1, characterized in that: The leftmost side of the device base (1) is provided with a vibrator baffle (33), which is fixedly connected to the device base (1). The exciter (30) is fixedly connected to the exciter baffle (33) and outputs a horizontal excitation force to the right; the exciter (30) is connected to the signal generator (31) through the power amplifier (32).

3. The tank liquid modal measuring device according to claim 2, characterized in that: The experimental tank (9) is a transparent cylindrical sealed container with an outlet and an inlet at the bottom. The inlet is equipped with an inlet check valve (84), and the outlet is equipped with an outlet check valve (85).

4. The tank liquid modal measuring device according to claim 3, characterized in that: The upper part of the storage tank clamp is a ring-shaped fixed claw (100), and the bottom part is a support base (102). The ring-shaped fixed claw (100) and the support base (102) are fixedly connected by four supports (101). The support base (102) is fixedly connected to the mobile platform (6) through the storage tank support plate (11). The lower part of the experimental tank (9) is fitted into the annular fixing claw (100).

5. The tank liquid modal measuring device according to claim 4, characterized in that: The liquid filling and draining device includes a storage tank (80), which is divided into two paths after passing through a self-priming pump (81) and a three-way valve (82), and is connected to an inlet check valve (84) and an outlet check valve (85) respectively.

6. The tank liquid modal measuring device according to claim 5, characterized in that: The liquid storage tank (80) and the self-priming pump (81), the self-priming pump (81) and the tee (82), the tee (82) and the inlet check valve (84), and the tee (82) and the outlet check valve (85) are all connected by hydraulic hoses (83) and are detachable connections.

7. The tank liquid modal measuring device according to claim 6, characterized in that: The mobile platform (6) is equipped with a displacement sensor (20) and a speed sensor (21), both of which are fixedly connected to the mobile platform (6). A CCD high-speed camera (22) is provided on the left side and the front side of the device base (1).

8. The tank liquid modal measuring device according to claim 7, characterized in that: The hydraulic hose (83) is a nut-connected bellows or a quick-connect bellows.

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