CAJ | 학술논문

基于接触动力学相关理论和弹性体线接触理论模型，建立了圆柱碰撞冲击理论数学模型，结合声学理论对圆柱碰撞冲击辐射噪声进行了理论预估。采用有限元法与瞬态边界元法相结合的瞬态噪声数值仿真方法，对圆柱碰撞冲击噪声进行数值仿真，实现了瞬态冲击噪声辐射声波的可视化。分析结果表明圆柱碰撞冲击噪声主要由加速度辐射噪声产生，圆柱碰撞冲击噪声辐射声场具有明显指向性。对比理论分析结果、数值仿真结果以及 Hertz 点接触模型计算结果可知，理论分析结果与数值仿真结果吻合较好，而 Hertz 点接触模型将圆柱体线接触模型简化为点接触模型，导致接触时间延长，接触力和冲击噪声幅值降低。基于数值仿真方法及理论分析，研究了冲击速度及材料弹性模量对圆柱碰撞冲击噪声的影响。
기우접촉동역학상관이론화탄성체선접촉이론모형，건립료원주팽당충격이론수학모형，결합성학이론대원주팽당충격복사조성진행료이론예고。채용유한원법여순태변계원법상결합적순태조성수치방진방법，대원주팽당충격조성진행수치방진，실현료순태충격조성복사성파적가시화。분석결과표명원주팽당충격조성주요유가속도복사조성산생，원주팽당충격조성복사성장구유명현지향성。대비이론분석결과、수치방진결과이급 Hertz 점접촉모형계산결과가지，이론분석결과여수치방진결과문합교호，이 Hertz 점접촉모형장원주체선접촉모형간화위점접촉모형，도치접촉시간연장，접촉력화충격조성폭치강저。기우수치방진방법급이론분석，연구료충격속도급재료탄성모량대원주팽당충격조성적영향。
A theoretical mathematical model for collision of two cylinders was established based on the contact dynamics and the elastic line-contact theory and then the impact noise radiated by cylinders was computed by using the acoustical theory.Afterwards,a numerical simulation method used to compute transient noise was presented based on the finite element method (FEM)and the transient boundary element method (TBEM).Then,impact noise produced by collision of cylinders was simulated with FEM/TBEMand the visualization of transient sound wave was realized.Numerical simulated results were compared with theoretical ones and those using Hertz contact model.It was indicated that the simulated results are in good agreement with theoretical ones;but Hertz contact model may cause a larger error.In addition,the effect of impact velocity and elastic modulus on collision of two cylinders was studied.