A 3D numerical simulation method for the vibration reduction effect of particle dampers under two-dimensional vibration conditions
A particle damper and two-dimensional vibration technology, which is applied in CAD numerical modeling, shock absorbers, friction shock absorbers, etc., can solve the problems of many influencing factors, influence of vibration damping performance, difficulty in popularization, etc., and expand the scope of research , the effect of high computational efficiency
Active Publication Date: 2022-06-07
BEIHANG UNIV
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Problems solved by technology
However, due to its many influencing factors, complex design methods, and highly nonlinear vibration reduction effects, its application is limited.
Only the vibration mode and vibration level of the damper cavity are different, which will affect the vibration damping performance
So far, most studies can only simulate particle dampers under one-dimensional vibration conditions (limited to horizontal or vertical directions), and the conclusions drawn are often difficult to generalize, and even different simulation models may produce seemingly contradictory conclusions
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[0076] The parameters of the main structure to be damped are: the mass of the main structure M=0.293kg, the equivalent damping coefficient C=0.116, and the equivalent stiffness K=1602.7N / m. It can be known that the natural modal frequency of the main structure is f n =11.771Hz, the structural inherent damping ratio ζ=0.268%.
[0077] According to engineering needs, a particle damper is designed. The particle cavity is filled with 200 acrylic resin particles with a diameter of d=6mm, and the mass ratio is m r = 9.2%. Particle density ρ=1190kg / m 3 , Coulomb friction coefficient μ = 0.52, contact damping constant η = 0.077. Particle Elastic Modulus E p =331.37MPa, cavity elastic modulus E c = 281.85MPa, Poisson's ratio υ = 0.38 of granular material, normal contact stiffness k between particles npp =10 7 N / m 3 / 2 , and the normal contact stiffness k between the particle and the cavity wall npw =1.3×10 7 N / m 3 / 2 .
[0078] Compared with the experimental value under the ...
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The invention discloses a 3D numerical simulation method for the vibration reduction effect of a particle damper under two-dimensional vibration conditions. By modifying the external excitation module of the numerical model of the particle damper, it can realize the vibration simulation of six scenarios in a two-dimensional plane. , and then predict the particle damping effect under corresponding vibration conditions. Through comparison with existing experiments, the numerical simulation method proposed by the present invention has higher accuracy.
Description
technical field [0001] The invention belongs to a numerical simulation method of vibration reduction and noise reduction technology, in particular to a 3D numerical simulation of the vibration reduction effect of a particle damper under two-dimensional vibration conditions that can predict the vibration reduction effect of a particle damper that vibrates in a two-dimensional plane. method. Background technique [0002] Particle damping has broad application prospects under extreme temperature conditions. Due to its extremely wide temperature application range, particle damping is often used for vibration suppression under extreme working conditions in the aerospace field, and shows a good vibration reduction effect. However, due to its many influencing factors, complex design methods, and highly nonlinear vibration reduction effect, its application is limited. Only the vibration excitation mode and excitation magnitude of the damper cavity are different, which will affect t...
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IPC IPC(8): G06F30/17G06F30/23G06F30/25F16F7/01G06F111/04G06F111/10G06F119/14
CPCG06F30/17G06F30/23G06F30/25F16F7/015G06F2111/10G06F2111/04G06F2119/14Y02T90/00
Inventor 王延荣刘彬魏大盛唐伟
Owner BEIHANG UNIV