A hydrofoil torsional vibration testing apparatus and method for accurately adjusting the angle of attack and stiffness

Abstract

The present application relates to a kind of water wing torsional vibration test device and method of precise angle of attack and rigidity adjustment, belong to ship detection device technical field.The present application includes angle of attack adjustment module, locking module and torsional rigidity adjustment module;Water wing shaft is equipped with angle of attack adjustment module and locking module;Angle of attack adjustment module includes worm wheel rotating with water wing, and worm wheel is connected with torsional rigidity adjustment module.The present application improves the adjustment accuracy of water wing by reducing the error of water wing end attack angle adjustment, realizes the high-precision adjustment of water wing;Through the adjustment method of high-precision spring-sensor combination, the stable water wing torsional rigidity value in a certain angle range is obtained, and the adjustment of water wing torsional rigidity is realized by replacing spring, the device is compact in structure, convenient to adjust, accurate in measurement;In the same device, the functions of water wing attack angle and water wing torsional rigidity accurate adjustment are realized, and the related test of water wing torsional vibration can be directly carried out.

Description

TECHNICAL FIELD

[0001] The application relates to a water wing torsional vibration testing device and method with precisely adjusted attack angle and rigidity, and belongs to the technical field of water conservancy projects. BACKGROUND

[0002] A water wing with a certain direction freedom will vibrate in a water flow with a certain water speed, and the vibration characteristics are related to factors such as the attack angle of the water wing (the included angle between the installation direction of the water wing and the direction of the flow), the water speed, the rigidity of the water wing and the like. The phenomenon can be studied through numerical simulation calculation and experimental methods, but there is a lack of a water wing torsional vibration testing device integrated with the functions of precisely adjusting the attack angle of the water wing and the torsional rigidity in the prior art. There is an urgent need in the technical field for a water wing torsional vibration testing device capable of precisely adjusting the attack angle of the water wing and the torsional rigidity. SUMMARY

[0003] The application aims to solve the technical problem of how to obtain a water wing torsional vibration testing device capable of precisely adjusting the attack angle of the water wing and the torsional rigidity.

[0004] To achieve the purpose of solving the above problems, the technical scheme adopted by the application is to provide a water wing torsional vibration testing device with precisely adjusted attack angle and rigidity, which comprises an attack angle adjusting module, a locking module and a torsional rigidity adjusting module; the attack angle adjusting module and the locking module are arranged on a water wing shaft; the attack angle adjusting module comprises a worm gear and a worm, the worm gear is connected with the torsional rigidity adjusting module.

[0005] Preferably, the attack angle adjusting module comprises an adjusting hand wheel, a worm, a worm gear and a worm mounting bracket; the worm gear is coaxial with the water wing; the worm mounting bracket is provided with the worm, one end of the worm is provided with the adjusting hand wheel, and the other end of the worm is connected with the worm gear.

[0006] Preferably, a transmission ratio is arranged between the worm gear and the worm, the worm gear and the worm do not rotate through the same angle at the same time, and the angle through by the worm gear is much smaller than the angle through by the worm.

[0007] Preferably, the water wing shaft is provided with the locking module for preventing the water wing shaft from rotating.

[0008] Preferably, the torsional rigidity adjusting module comprises a sensor mounting adjusting assembly, a force sensor, a sensor-spring connecting piece, a spring and a force arm assembly; the force arm assembly is arranged on the worm gear, the force arm assembly intersects and is perpendicular to the extension line of the water wing shaft in the length direction; one end of the force arm assembly is sequentially connected with the spring, the sensor-spring connecting piece, the force sensor and the sensor mounting adjusting assembly.

[0009] Preferably, the torsional stiffness adjustment module includes two symmetrical groups of components, which are respectively arranged on both sides of a plane passing through the hydrofoil axis and perpendicular to the length direction of the force arm assembly; each group of components includes a spring, a sensor-spring connector, a force sensor and a sensor mounting adjustment assembly.

[0010] Preferably, both ends of the force arm assembly are respectively connected to a spring, a sensor-spring connector, a force sensor and a sensor mounting and adjusting assembly in sequence.

[0011] Preferably, the extension and contraction directions of the springs in the two groups of components are parallel and perpendicular to the length direction of the lever arm component.

[0012] Preferably, the spring is connected to the force sensor via a sensor-spring connection.

[0013] The present invention provides a testing method for a hydrofoil torsional vibration testing device for accurately adjusting the angle of attack and stiffness, comprising the following steps:

[0014] Step 1: Use the angle of attack adjustment module to adjust the angle of attack of the hydrofoil; turn the adjustment handwheel to drive the worm to rotate, the worm drives the worm wheel to rotate, and the worm wheel drives the hydrofoil to rotate; adjust the angle of attack of the hydrofoil by adjusting the handwheel;

[0015] Step 2: Secure the hydrofoil shaft with the locking module; remove the adjusting handwheel and worm gear;

[0016] Step 3: Use the torsional stiffness adjustment module. Adjust the sensor mounting adjustment assembly at either end of the arm assembly to move the force sensor. This stretches the high-precision spring, generating an elastic force that can be read by the sensor. Next, adjust the sensor mounting adjustment assembly at the other end of the arm assembly to move the force sensor. This stretches the spring, and the elastic force is also read by the sensor. Continuously adjust the positions of the sensor mounting adjustment assemblies at both ends of the arm assembly and compare the readings of the two sensors to balance the forces at both ends of the arm assembly.

[0017] Step 4: After the sensor is in place, loosen the hydrofoil shaft locking device; the hydrofoil torsional stiffness can be adjusted by replacing springs with different parameters;

[0018] Step 5: After debugging the hydrofoil's angle of attack, spring, and sensor, the force sensor can be used to measure and calculate the torsional force on the hydrofoil in the water flow. When the force sensor's accuracy and sampling frequency are high enough, the frequency and amplitude characteristics of the hydrofoil's torsional vibration can be analyzed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present application improves the adjustment precision of the water wing attack angle, realizes the high-precision adjustment of the water wing, and realizes the stable water wing torsional rigidity value in a certain angle range through the high-precision spring-sensor combined adjustment method, and realizes the adjustment of the water wing torsional rigidity through the spring replacement. The device and method have the advantages of compact structure, convenient adjustment and accurate measurement. The functions of the water wing attack angle and the water wing torsional rigidity accurate adjustment are realized in the same device, and the related test of the water wing torsional vibration can be directly carried out. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Figure 1 is a front view of the water wing torsional vibration test device for accurately adjusting the attack angle and rigidity according to the present application;

[0022] Reference signs: 1. Sensor installation and adjustment assembly; 2. Force sensor; 3. Sensor-spring connecting piece; 4. Spring; 5. Force arm assembly; 6. Adjustment hand wheel; 7. Worm; 8. Worm gear; 9. Worm installation support. DETAILED DESCRIPTION

[0023] In order to make the present application more obvious and easy to understand, the preferred embodiments are described in detail below with reference to the accompanying drawings:

[0024] As Figure 1The technical scheme adopted by the present application is to provide a water wing torsional vibration testing device for precisely adjusting the attack angle and rigidity, which comprises an attack angle adjusting module, a locking module and a torsional rigidity adjusting module; the attack angle adjusting module and the locking module are arranged on the water wing shaft; the attack angle adjusting module comprises a worm wheel 8 rotating with the water wing, and the worm wheel 8 is connected with the torsional rigidity adjusting module. The attack angle adjusting module comprises an adjusting hand wheel 6, a worm 7, the worm wheel 8 and a worm mounting bracket 9; the worm wheel 8 is coaxial with the water wing; the worm mounting bracket 9 is provided with the worm 7, one end of the worm 7 is provided with the adjusting hand wheel 6, and the other end of the worm 7 is connected with the worm wheel 8. A transmission ratio is arranged between the worm wheel 8 and the worm 7, the angle turned by the worm wheel 8 is much smaller than the angle turned by the worm 7 in the same time. The locking module is arranged on the water wing shaft to prevent the water wing shaft from rotating. The torsional rigidity adjusting module comprises a sensor mounting adjusting assembly 1, a force sensor 2, a sensor-spring connecting piece 3, a spring 4 and a force arm assembly 5; the force arm assembly 5 is arranged on the worm wheel 8, and the force arm assembly 5 intersects and is perpendicular to the extension line of the water wing shaft in the length direction; one end of the force arm assembly 5 is sequentially connected with the spring 4, the sensor-spring connecting piece 3, the force sensor 2 and the sensor mounting adjusting assembly 1. The torsional rigidity adjusting module comprises two symmetrical groups of components, and the two groups of components are arranged on the two sides of a plane penetrating through the water wing shaft and being perpendicular to the length direction of the force arm assembly 5; each group of components comprises the spring 4, the sensor-spring connecting piece 3, the force sensor 2 and the sensor mounting adjusting assembly 1. The two ends of the force arm assembly 5 are sequentially connected with the spring 4, the sensor-spring connecting piece 3, the force sensor 2 and the sensor mounting adjusting assembly 1. The extension directions of the springs 4 in the two groups of components are parallel and perpendicular to the length direction of the force arm assembly 5. The spring 4 is connected with the force sensor 2 through the sensor-spring connecting piece 3.

[0025] The present application provides a testing method of the water wing torsional vibration testing device for precisely adjusting the attack angle and rigidity, which comprises the following steps:

[0026] Step 1: adjusting the attack angle of the water wing by using the attack angle adjusting module; rotating the adjusting hand wheel 6 to drive the worm 7 to rotate, the worm 7 drives the worm wheel 8 to rotate, and the worm wheel 8 drives the water wing to rotate; the attack angle of the water wing is adjusted by the adjusting hand wheel 6;

[0027] Step 2: fixing the water wing shaft by using the locking module; removing the adjusting hand wheel 6 and the worm 7;

[0028] Step 3: Adjust the sensor mounting adjustment assembly 1 at either end of the force arm assembly 5 to move the force sensor 2, and the high-precision spring 4 is stretched to generate an elastic force, which can be read by the sensor 2; then, adjust the sensor mounting adjustment assembly 1 at the other end of the force arm assembly 5 to move the force sensor 2, and the spring 4 is stretched at this time, and the elastic force is also read by the sensor 2; continuously adjust the position of the sensor mounting adjustment assembly 1 at both ends of the force arm assembly 5, compare the readings of the two sensors 2, and balance the forces at both ends of the force arm assembly 5.

[0029] Step 4: After the sensor 2 position is adjusted in place, loosen the water wing shaft locking device; by replacing springs 4 with different parameters, the water wing torsional stiffness can be adjusted.

[0030] Step 5: After the water wing attack angle, spring and sensor debugging is completed, the torsional force of the water wing in the water flow can be measured and calculated through the force sensor, and when the force sensor precision and sampling frequency are high enough, the frequency and amplitude characteristics of the water wing torsional vibration can be analyzed.

[0031] Embodiment

[0032] As shown in Figure 1 , the present application mainly consists of an attack angle adjustment module, a locking module and a torsional stiffness adjustment module.

[0033] The attack angle adjustment module includes an adjustment hand wheel 6, a worm 7, a worm gear 8 and a worm mounting bracket 9, which is coaxially installed with the water wing, and the water wing rotates with the worm gear 8, and the angle turned by both in the same time is equal.

[0034] The attack angle adjustment module is used: rotate the adjustment hand wheel 6 to drive the worm 7 to rotate, and the angle movement of both is consistent; the worm 7 drives the worm gear 8 to rotate, and since there is a transmission ratio between the worm gear 8 and the worm 7, the angle turned by both in the same time is not equal, and the angle turned by the worm gear 8 is much smaller than that by the worm 7, so the angle error generated by the adjustment hand wheel 6 is greatly reduced after being transmitted to the water wing.

[0035] When the water wing attack angle is adjusted in place, the water wing shaft is fixed by the locking module, and the worm 7 and the adjustment hand wheel 6 are removed for the next adjustment work.

[0036] As shown in Figure 1 , the water wing torsional stiffness adjustment module includes a sensor mounting adjustment assembly 1, a force sensor 2, a sensor-spring connecting piece 3, a high-precision spring 4 and a force arm assembly 5. Among them, the force sensor 2, the sensor-spring connecting piece 3 and the high-precision spring 4 are two, which are installed at both ends of the force arm assembly 5.

[0037] The use of torsional stiffness adjustment module: force arm assembly 5 is installed above the worm wheel 8, and is fixedly connected with the worm wheel 8, and the angles turned by the two are equal in the same time. The force arm assembly 5 is connected with the force sensor 2 through the high-precision spring 4 and the sensor-spring connecting piece 3. The other end of the force sensor 2 is fixed on the sensor installation adjustment assembly 1.

[0038] When the water wing attack angle is adjusted in place, locked, and the worm 7 and the adjustment handle 6 are removed, the sensor installation adjustment assembly 1 at either end of the force arm assembly 5 is adjusted, so that the force sensor 2 moves to the left. Correspondingly, since the water wing shaft has been locked and fixed, the high-precision spring 4 is stretched, generating an elastic force, which can be read by the sensor 2; then, the sensor installation adjustment assembly 1 at the other end of the force arm assembly 5 is adjusted, so that the other sensor 2 moves to the left, and at this time, the other spring 4 is stretched, and the elastic force is also read by the other sensor 2. The positions of the sensor installation adjustment assemblies 1 at both ends of the force arm assembly are continuously adjusted, and the readings of the two sensors 2 are compared, so that the forces at both ends of the force arm assembly are balanced.

[0039] After the sensor position is adjusted in place, the water wing shaft locking device is loosened, and the forces at both ends of the force arm assembly 5 are balanced. At this time, if the water wing shaft is turned in any direction by a certain angle, the force balance state on both sides of the force arm changes, and the springs on both sides will generate a torsional moment opposite to the direction of rotation of the water wing shaft. The size of the moment is related to the torsional stiffness of the water wing device, and in the device of the present application, it is related to the stiffness of the high-precision spring 4. Therefore, by replacing springs with different parameters, the adjustment of the torsional stiffness of the water wing can be realized.

[0040] After the water wing attack angle, spring and sensor devices are debugged, the torsional force on the water wing in the water flow can be measured and calculated through the force sensor. When the accuracy and sampling frequency of the force sensor are high enough, the frequency and amplitude of the water wing torsional vibration can be analyzed.

[0041] The above is only a preferred embodiment of the present application, and is not a limitation on the form and substance of the present application. It should be pointed out that for ordinary skilled persons in the art, some improvements and supplements can be made without departing from the present application, and these improvements and supplements should also be regarded as the protection scope of the present application. For those skilled in the art, some minor changes, modifications and equivalent changes made on the basis of the disclosed technical content without departing from the spirit and scope of the present application are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolution of the above-mentioned embodiments according to the essential technology of the present application are still within the scope of the technical solutions of the present application.

Claims

1. A hydrofoil torsional vibration test device for accurately adjusting the angle of attack and stiffness, characterized in that: It includes an angle of attack adjustment module, a locking module and a torsional stiffness adjustment module; the hydrofoil shaft is provided with an angle of attack adjustment module and a locking module for preventing the hydrofoil shaft from rotating; the angle of attack adjustment module includes a worm gear that drives the hydrofoil to make angular displacement, and the worm gear is connected to the torsional stiffness adjustment module; the torsional stiffness adjustment module includes two symmetrical groups of components, and the two groups of components are respectively arranged on both sides of a plane passing through the hydrofoil shaft and perpendicular to the length direction of the force arm assembly; each group of components includes a sensor installation adjustment assembly, a force sensor, a sensor-spring connector, a spring and a force arm assembly; a force arm assembly is provided on the worm gear, and the force arm assembly intersects and is perpendicular to the axial extension line of the hydrofoil shaft along the length direction; one end of the force arm assembly is connected in sequence with the spring, the sensor-spring connector, the force sensor and the sensor installation adjustment assembly.

2. A hydrofoil torsional vibration testing device for accurately adjusting the angle of attack and stiffness according to claim 1, characterized in that: The angle of attack adjustment module includes an adjustment handwheel, a worm, a worm gear and a worm mounting bracket; the worm gear is coaxial with the hydrofoil; a worm is provided in the worm mounting bracket, one end of the worm is provided with an adjustment handwheel, and the other end of the worm is connected to the worm gear.

3. The hydrofoil torsional vibration testing device for accurately adjusting the angle of attack and stiffness according to claim 2, characterized in that: A transmission ratio is set between the worm wheel and the worm. The angles rotated by the worm wheel and the worm at the same time are different, and the angle rotated by the worm wheel is much smaller than the angle rotated by the worm.

4. The hydrofoil torsional vibration testing device for accurately adjusting the angle of attack and stiffness according to claim 2, characterized in that: The two ends of the force arm assembly are respectively connected in sequence to a spring, a sensor-spring connector, a force sensor and a sensor installation and adjustment assembly.

5. The hydrofoil torsional vibration testing device for accurately adjusting the angle of attack and stiffness according to claim 4, characterized in that: The expansion and contraction directions of the springs in the two groups of components are parallel and perpendicular to the length direction of the force arm components.

6. The hydrofoil torsional vibration testing device for accurately adjusting the angle of attack and stiffness according to claim 4, characterized in that: The spring is connected to the force sensor via a sensor-spring connection.

7. A method for testing a hydrofoil torsional vibration test device for accurately adjusting the angle of attack and stiffness according to any one of claims 4 to 6, characterized in that: The following steps are involved: Step 1: Use the angle of attack adjustment module to adjust the angle of attack of the hydrofoil; turn the adjustment handwheel to drive the worm to rotate, the worm drives the worm wheel to rotate, and the worm wheel drives the hydrofoil to rotate; adjust the angle of attack of the hydrofoil by adjusting the handwheel; Step 2: Secure the hydrofoil shaft with the locking module; remove the adjusting handwheel and worm gear; Step 3: Use the torsional stiffness adjustment module. Adjust the sensor mounting adjustment assembly at either end of the arm assembly to move the force sensor. This stretches the high-precision spring, generating an elastic force that can be read by the sensor. Next, adjust the sensor mounting adjustment assembly at the other end of the arm assembly to move the force sensor. This stretches the spring, and the elastic force is also read by the sensor. Continuously adjust the positions of the sensor mounting adjustment assemblies at both ends of the arm assembly and compare the readings of the two sensors to balance the forces at both ends of the arm assembly. Step 4: After the sensor is in place, loosen the hydrofoil shaft locking device; the hydrofoil torsional stiffness can be adjusted by replacing springs with different parameters; Step 5: After debugging the hydrofoil's angle of attack, spring, and sensor, the force sensor can be used to measure and calculate the torsional force on the hydrofoil in the water flow. When the force sensor's accuracy and sampling frequency are high enough, the frequency and amplitude characteristics of the hydrofoil's torsional vibration can be analyzed.

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