发动机活塞运动的数学模型与振动分析

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中图分类号：U464.133 文献标识码：A 文章编号：1003-8639（2025）10-0115-03

【Abstract】This paper establishes a multibody dynamics mathematical model that integrates the kinematic characteristics of the piston-connecting rod-crankshaft mechanism forthe engine pistonsystem.Basedonthe theory of rigid-flexiblecouplingand Newton-Eulerequations，asetofcontrolequations isderived，andthereliabilityof themodel is verifid.Thestudy further reveals the multi-sourceexcitationcoupling mechanism of piston vibration，clarifies the modal characteristics of piston free vibrationand theresponse lawsofforced vibration，and proposes athree-dimensional vibrationcontrol strategy involving source suppression，transmission path weakening，and boundary optimization.Itis hoped that this will provide theoretical reference for improving engine noise control.

【Key words】engine；piston motion；mathematical model；vibration characteristics

0 引言

在内燃机技术领域，活塞-连杆-曲轴机构作为发动机的核心动力传递系统，其运动可靠性直接决定了整机的工作效率与使用寿命。（剩余3899字）