摘要
根据活塞在实际工作过程中的受力,建立了考虑润滑油膜阻尼和摩擦作用的活塞拍击现象集总参数非线性动力学模型。依据活塞和缸壁可能的九种接触情况,分别建立其动力学微分方程,并采用变步长四阶龙格库塔算法编程对模型进行求解。模拟仿真得到活塞在气缸中的运动模式、活塞水平位移、活塞转角和活塞对气缸壁的敲击力。分析得到:在做功行程,燃气爆发压力引起的连杆作用力水平分量和绕活塞销的转矩是引起活塞拍击的主要原因;在吸气、压缩和排气行程,活塞惯性力引起的连杆作用力水平分量和绕活塞销的转矩是引起活塞拍击的主要原因。
In order to study the piston slap mechanism of internal combustion engine,a detailed theoretical model and simulation was conducted. A lumped parameter nonlinear dynamic model of piston’s secondary motion （lateral and rotational motion） was developed to simulate the piston dynamic behavior and compute the slap force in operation condition,and the damping and friction of oil film were taken into account. According to nine possible contact status between piston and cylinder wall,the dynamic differential equations were respectively constructed and resolved by 4th order variety step size Rung-Kutta method. Via the simulation program,the dynamic behavior,lateral displacement,the rotational angle and slap force of piston were obtained. The research result indicates that in explosion stroke the pressure of gas is the main reason of piston slap,and in intake,compression and exhaust stroke the inertia force of piston are the main reason of piston slap.
出处
《系统仿真学报》
EI
CAS
CSCD
北大核心
2008年第20期5476-5479,共4页
Journal of System Simulation
基金
重庆市自然科学基金重点项目(CSTC2006BA7013)
关键词
活塞拍击
内燃机
建模
运动模式
仿真
piston slap, internal combustion engine, modeling, dynamic behavior, simulation
