摘要
建立了内燃机曲轴轴系弯扭耦合运动微分方程,模型中考虑了轴系变惯量、质量偏心和非线性干摩擦阻尼力等因素.采用数值积分法研究了质量偏心和转速对系统非线性动力学响应的影响;将系统微分方程组转化为非线性代数方程组,运用谐波平衡法获得了系统幅频特性.结果表明,谐波平衡法与数值积分法得到的结果吻合较好;气缸与活塞间阻尼会对系统响应振幅产生明显抑制作用;减小曲轴轴系偏心量可以有效地提高曲轴系统运动稳定性.
The bending-torsional coupling dynamic model of the crankshaft system in combustion engine was presented by considering varied inertia, mass eccentricity and nonlinear friction damping force. Numerical integration methods were adopted to analyze the effects of the mass eccentricity and rotate speed on the dynamic performance, and the characteristics of amplitude frequency responses were obtained based on the harmonic balance method. It is shown that the harmonic balance method coincides well with the numerical method. The damping between the cylinder and piston can produce significant inhibition of system response amplitude. The motion stability can be effectively improved by reducing the eccentric of crankshaft system.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第3期402-405,414,共5页
Journal of Northeastern University(Natural Science)
基金
国家高技术研究发展计划项目(2012AA040104)
关键词
曲轴轴系
变惯量
弯扭耦合
非线性振动
谐波平衡法
幅频响应
crankshaft system
varied inertia
bending-torsional coupling
nonlinear vibration
harmonic balance method
amplitude frequency response
