Fan blade vibration reduction and parameter optimization method of power vibration absorber based on inerter

A technology for dynamic vibration absorbers and fan blades, which is applied in the directions of engines, wind turbines, machines/engines, etc., can solve the problems of narrow effective frequency band and insignificant vibration reduction effect, and achieves good universality, low cost and high reliability. Effect

Pending Publication Date: 2022-04-05
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

However, due to the narrow effective frequency band of the traditional tuned mass damper, the vibration reduction effect is not obvious in the face of complex wind input

Method used

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  • Fan blade vibration reduction and parameter optimization method of power vibration absorber based on inerter
  • Fan blade vibration reduction and parameter optimization method of power vibration absorber based on inerter
  • Fan blade vibration reduction and parameter optimization method of power vibration absorber based on inerter

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Experimental program
Comparison scheme
Effect test

Embodiment

[0104] Taking the structural parameters of a NREL-5Mw fan blade as an example, its rated speed is Ω=1.27rad / s, and the basic modal mass is m 0 = 1354kg, blade length L = 61.5m, the basic mode shape function of the blade shimmy direction is

[0105]

[0106] Assume that the dynamic vibration absorber based on inertia is installed at a position 45m away from the root of the blade, that is, a=Φ(x 0 )=0.516, and the selected mass ratio μ=0.03. At this time, you can choose to set the proportional coefficient as n=0.3, m=1.255n+0.035.

[0107] Firstly, the frequency domain performance of the dynamic vibration absorber based on inertia is verified. Figure 2(a) ~ Figure 2(c) is the frequency response curve of the displacement of the fan blade in the shimmy direction. Considering three different operating states (that is, Ω=0 corresponds to the shutdown state, Ω=Ω 0 The corresponding fan works at the rated speed and Ω=3Ω 0 Representing extreme cases), inertial-based dynamic vi...

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Abstract

The invention discloses a fan blade vibration reduction and parameter optimization method of an inerter-based dynamic vibration absorber, which comprises the following steps of: firstly, establishing a kinetic equation of a system consisting of a wind driven generator blade and the inerter-based dynamic vibration absorber by utilizing an Euler-Lagrange equation; further solving a transfer function from the external load borne by the wind driven generator blade to the displacement of the blade in the shimmy direction; secondly, carrying out dimensionless processing on the transfer function, and deducing an analytical expression of optimal structural parameters of the inertial-capacity-based dynamic vibration absorber by utilizing a pole assignment method; according to the method, the dynamic vibration absorber based on the inerter is applied to shimmy control of the blades of the wind driven generator, the analytical expression of the optimal parameters is given, and compared with a traditional method for solving the optimal parameters through numerical optimization, the optimal parameter expression in the analytical form obviously has better simplicity and universality.

Description

technical field [0001] The invention belongs to the field of vibration reduction of wind power generators, in particular to a vibration reduction and parameter optimization method for fan blades of a dynamic vibration absorber based on inertial capacity. Background technique [0002] As one of the most important renewable energy sources, wind energy has experienced rapid growth worldwide in the past few decades. In the current design of wind turbines, wind turbines are designed to have larger and larger capacity, longer blades, and higher towers to reduce the cost of wind power generation. [0003] However, the increase in the size of the wind turbine blade also makes it have the structural characteristics of flexibility and light damping, and is more easily excited by external loads. Unnecessary structural vibration will reduce the fatigue life and power generation efficiency of wind turbines, and increase power generation costs. [0004] As an important vibration control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/02F03D17/00F03D80/00
CPCY02E10/72
Inventor 陈志强舒斯昊
Owner NANJING UNIV OF SCI & TECH
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