3D numerical simulation method for vibration attenuation effect of particle damper under two-dimensional vibration condition
A particle damper and two-dimensional vibration technology, which is applied in CAD numerical modeling, shock absorbers, friction shock absorbers, etc., can solve problems such as many influencing factors, impact of vibration damping performance, limitations, etc., to expand the scope of research, The effect of high computational efficiency
Active Publication Date: 2021-02-05
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 seen that the natural mode frequency of the main structure is f n =11.771Hz, the structural inherent damping ratio ζ=0.268%.
[0077] According to the engineering needs, a particle damper is designed. Fill the particle cavity with 200 acrylic resin (Acrylic resin) particles with a diameter of d=6mm, and its mass ratio 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 of granular material υ=0.38, normal contact stiffness between particles k 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] It is compared with the experimental val...
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The invention discloses a 3D numerical simulation method for the vibration attenuation effect of a particle damper under a two-dimensional vibration condition, and the method can achieve the vibrationsimulation of six types of scene conditions in a two-dimensional plane through the transformation of an external excitation module of a numerical model of the particle damper, and further predicts the particle damping vibration attenuation effect under the corresponding vibration condition. Compared with an existing experiment, the numerical simulation method provided by the invention has relatively high accuracy.
Description
technical field [0001] The invention belongs to a numerical simulation method of vibration reduction and noise reduction technology, specifically 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 occurs two-dimensional in-plane vibration method. Background technique [0002] Particle damping has broad application prospects under extreme temperature conditions. Due to its extremely wide temperature range, particle damping is often used for vibration suppression under extreme 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 effects, its application is limited. The damping performance will be affected only if the vibration mode and vibration magnitude of the damper cavity are different. So f...
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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