Research On Dynamics Of Hand-held Vibration Machine

Vibration tools are widely used in production,which bings great convenience to people’s lives.The vibration generated by the vibrating tool is transmitted to the operator through the handle,which is called hand-transmitted vibration.Exploring the response of hand-transmitted vibration to the arm system is of great significance and value.This can reduce national and personal economic losses and protect the health of workers.The arm system is a system composed of skin,muscles,etc.,with non-linear factors.Taking hands and vibration tools as objects,establish nonlinear vibration equations for single-degree-of-freedom and multi-degree-of-freedom systems,and analyze their vibration characteristics with multi-scale methods.The theoretical analysis and numerical calculation of the single-degree-of-freedom system are carried out to study the main resonance,1/3 subharmonic resonance,third superharmonic resonance and random vibration of the system under deterministic periodic excitation.The main resonance results show that it is a weakly nonlinear system,and the numerical analysis is consistent with the theoretical analysis.Analysis of the 1/3subharmonic resonance shows that there is no 1/3 subharmonic under the actual physical parameters.Analysis of the third superharmonic resonance and discussion External excitation and system damping affect the system amplitude.Analyzing the second-order moment of the system under random excitation and the main resonance of the system under the corresponding periodic excitation,it is found that the second-order moment has the same characteristics as the main resonance.The main resonance,internal resonance and stochastic resonance under narrow-band random excitation of multi degree of freedom system are analyzed.The amplitude frequency equation and second-order moment equation of the system are obtained by multi-scale method.The research results have reference value for exploring the response characteristics of hand-transmitted vibration to arm vibration diseases.Figure 85;Table 0;Reference 59...