Continuous underwater mechanical arm vortex-induced vibration testing device

Abstract

The invention discloses a continuous underwater mechanical arm vortex-induced vibration testing device which comprises a water tank, and a power module and a transmission module are installed above the water tank. The power module is connected with the center of a rotating rod located in the water tank through the transmission module and drives the rotating rod to rotate. At least one end of the rotating rod is detachably connected with an angle adjusting structure, and the bottom of the angle adjusting structure is connected with the underwater mechanical arm through a clamp. An acceleration sensor is arranged on the underwater mechanical arm, and a flow meter is mounted in the water tank; and the flow meter and the acceleration sensor are connected with the data processing device, and the data processing device is connected with the display device.

Description

technical field [0001] The invention belongs to the field of fluid mechanics, in particular to a continuous underwater manipulator arm vortex-induced vibration testing device. Background technique [0002] Vortex-induced vibration is a common phenomenon in nature. From the perspective of fluid, all columnar structures will alternately generate vortices on both sides of the structure at a certain flow rate, leaving the surface of the structure. Frequency locking occurs when the emission frequency of this vortex is close to the natural frequency of the structure. The phenomenon of frequency locking can easily cause damage to underwater structures, resulting in irreparable environmental damage and economic losses. [0003] As a typical cylindrical structure, the underwater robotic arm plays an important role in marine fishing and resource exploration. When the underwater robotic arm is subjected to vortex-induced vibration, the movement of the underwater robotic arm will be ...

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Problems solved by technology

[0005]1. The flow rate of the flow pump is not easy to control, and the large-scale towing test needs enough space for the trailer to sail, which requires high site requirements and high construction costs

In addition, due to the need to drive a large aircraft, there are also problems of large volume and complex structure.

[0006]2. The test test route is straight line. When the trailer drives to the boundary of the test pool, it needs to change direction, which is very inconvenient. At the same time, it is impossible to continuously test the underwater structure vortex vibration

[0007]3. When the dragging speed is fast, the test time will be short and the test results will not be accurate enough

[0008]4. The movement posture of the underwater structure is often ignored in the test and test. As far as the underwater manipulator is concerned, it moves all the time in actual work. These test devices It is impossible to measure the vortex induced vibration of the underwater structure in different motion states

[0009]5. The speed regulation of the test device is single, and the speed regulation can only be achieved by changing the speed of the trailer or adjusting the flow pump, and the speed regulation range is small

[0010]6. The position of the test structure is fixed, it is not easy to change the installation position of the test structure and the direction of water flow during the test, and usually only one working condition can be simulated

[0011]7. Fiber Bragg grating sensors are generally used in tests, which are easily damaged in harsh environments or when subjected to large external forces, and have a short life

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