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Multi-direction cyclic loading device and method for offshore wind turbine support structure vibration tests

A multi-directional cyclic loading and supporting structure technology, applied in the testing of machine/structural components, vibration testing, measuring devices, etc., can solve problems such as soil disturbance around the foundation, affecting the reliability of test results, and complicated operations

Active Publication Date: 2016-03-02
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Every time it is necessary to measure the natural frequency of the model, the loading rod must be disconnected. The operation is complicated and it is easy to cause a certain disturbance to the soil around the foundation, which seriously affects the reliability of the test results.

Method used

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  • Multi-direction cyclic loading device and method for offshore wind turbine support structure vibration tests
  • Multi-direction cyclic loading device and method for offshore wind turbine support structure vibration tests
  • Multi-direction cyclic loading device and method for offshore wind turbine support structure vibration tests

Examples

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Embodiment 1

[0063] Embodiment 1, multi-directional cyclic loading device, with reference to the attached Figure 4a-10 .

[0064] The multi-directional cyclic loading device of the present invention comprises a frame 5, the frame 5 is arranged on the base 6, and the gear pair 2 is installed in the frame 5, and the gear pair 2 is two pairs, respectively on different horizontal planes, and the gear pair 2 includes two The force applying gears 21 meshing with each other, the upper surfaces of the two force applying gears 21 are respectively provided with a plurality of openings 22 uniformly distributed along its circumference, the force applying gears 21 are provided with a mass block 1, and the mass block 1 is fixed by the installation rod 11 Installed in the opening 22, the mass blocks 1 on the two force-applying gears 21 are symmetrically arranged, and the mass block 1 can rotate with the rotation of the force-applying gear 21 where it is located. The distance from the center is the radi...

Embodiment 2

[0073] Example 2, multi-directional cyclic loading method for vibration test of offshore wind turbine support structure.

[0074] The loading method of this embodiment adopts the multi-directional cyclic loading device of Embodiment 1.

[0075] There are many forms of load application in the present invention, which can be generally divided into one-way load and coupled load.

[0076] Apply unidirectional loading in x or y direction independently

[0077] Since the equipment can be rotated to change the direction of the load when a unidirectional load is applied, it is only necessary to use the mass block on the upper gear for loading. At this time, the mass block on the lower gear can be removed, resulting in a uniform and lightweight gear. Rotation does not create loads in the other direction.

[0078] According to the fan similarity theory of the test, the required load peak size F can be calculated Ymax and frequency f, and the number of cycles n. Then using the desire...

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Abstract

The invention provides a multi-direction cyclic loading device and method for offshore wind turbine support structure vibration tests. The device comprises a frame; gear pairs are installed in the frame; each gear pair comprises two force application gears symmetrically provided with mass blocks; each mass block can rotate along with the force application gear on which the mass block is located; a power device driving the gear pairs to rotate is also disposed in the frame. The method comprises the steps of obtaining an f-U graph and forming a formula through fitting; determining an output voltage U and each period of loading time t; testing an acceleration sensor; testing and calculating an initial natural vibration frequency and a system damping; applying cyclic loads with a specific frequency and amplitude to the device for many times; testing the current natural vibration efficiency of the device; making the total number of times of loading reach a quantity level required by tests. According to the invention, bidirectional cyclic loads can be applied to models, so that the requirement of wind turbine model tests for low frequency vibration can be easily met; the device is superior to a vibration exciter in the specific test fields.

Description

technical field [0001] The invention relates to the technical field of indoor model test equipment for dynamic characteristics of offshore fan support structures. Background technique [0002] As a clean renewable energy with the fastest development and the best industrial prospect, wind energy has been paid more and more attention, and has become one of the strategic choices to solve the global energy shortage and ensure energy security. my country's total wind energy reserves are about 3.226 billion kW, and about 1 billion kW of wind energy can be developed, including 750 million kW of offshore wind energy. The development of offshore wind energy will effectively alleviate my country's energy shortage and has become an important part of the country's "12th Five-Year Plan" energy strategy. It is of great significance to improving my country's current energy structure and achieving sustainable development. The supporting structure of offshore wind turbines is mainly compose...

Claims

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Application Information

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IPC IPC(8): G01M7/02
Inventor 国振黄玉佩王立忠
Owner ZHEJIANG UNIV
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