The Study Of Nonlinear Dynamics Of The Mechanism With Components Fabricated From Composite Materials

Modern mechanisms are continually developed to become high-speed, high-efficiency and light-weight during the fierce competition for market. The composite materials became new cossets of modern manufacturing for theirs' high intensity-to-weight and light weight. So, researching the application of new materials in mechanism became a very important content in the domain of modern mechanics.Now the study in the dynamics of the mechanism with components fabricated from composite materials are mostly limited to minuteness-distortion of components, and usually based on linear model. It is an ideal state and can't well explain lots of the dynamics behaviors of mechanism. For example, when the mechanism ran in high-speed or heavy-load state, the geometry distortion of components can be too large to extend the nonlinear behaviors of mechanism. If we also neglected the nonlinear effect here and regarded mechanism as a linear model, the error can be quite large. Furthermore, the configuration of composite materials is quite complex. We know little about the connection between the parameters of composite materials and the macroscopical dynamics characteristics of mechanism. It needs further study. These factors became the choke point, restricted the use and popularization of composite materials. It is very necessary to do further research on the nonlinear dynamics of mechanism with components fabricated from composite materials.In this paper, we considered the geometry nonlinear factor, and established the nonlinear finite element dynamic equation of the mechanism with components fabricated from fibre-reinforced composite materials. We used the multiple scale method and the numerical value iterative method together to deal with the nonlinear vibration dynamics equation; obtained the parsing answer during no resonance, intrinsic resonance, primary resonance and multiple resonance state of mechanism; and counted the numerical value answer to a real example by programming. We also explored the connection between the parameters of composite materials and the macroscopical dynamics characteristics of mechanism through calculating and analyzing the natural frequency of mechanism when the parameters of the mechanism are different. Taking the plane linkage mechanism with components fabricated from fibre-reinforced composite materials as an example, we did an experiment, analyzed and validated the nonlinear vibration of the mechanism. The work of this paper provided the theory basis to ameliorating the design of the mechanism with components fabricated from composite materials, controlling and optimizing the dynamics performance of the mechanism, preventing the harm of the nonlinear vibration, and ensuring the steady run of the mechanism.