自动机曲柄连杆机构柔性冲击研究  

RESEARCH ON FLEXIBLE IMPACT OF CRANK AND CONNECTING ROD MECHANISM OF AUTOMATIC GUN

作　　者：豆征[1] 李勇[1] 陈永刚[1] DOU Zheng;LI Yong;CHEN YongGang(Northwest Institute of Mechanical and Electrical Engineering,Xianyang 712000,China)

机构地区：[1]西北机电工程研究所,咸阳712000

出　　处：《机械强度》2023年第1期176-182,共7页Journal of Mechanical Strength

基　　金：国防科技基础173计划项目(2019-JCJQ-ZD-135)资助。

摘　　要：由于自动机曲柄连杆机构的质心在纵向不断运动,在高低过载交替发生的情况下,曲柄和连杆受到交替时变惯性载荷作用,产生动挠度,引起自动机柔性冲击;对柔性冲击的成因、特点进行分析,根据达朗伯原理中对惯性载荷的定义,在有限元分析中作为边界条件引入惯性载荷;在马蒙托夫时变规律火药气体作用条件下,对曲柄连杆机构进行运动仿真分析,得到了曲柄和连杆过载、跃度变化规律;再用有限元法对曲柄连杆进行了惯性载荷作用下动挠度(形变量)分析,结果表明,连杆在过载大于25 000 m/s2时成为振动的主要根源,降低转动副中心距和质心附近质量分布,可以降低动挠度,进而降低柔性冲击。For the centroid of crank connecting rod of automatic gun is moving continuously in longitudinal direction, under the condition of alternating high and low overload, the crank and connecting rod are subjected to the alternating time-varying inertia load, resulting in dynamic deflection and flexible impact of automatic gun;The causes and characteristics of flexible impact are analyzed. According to the definition of inertia load in D’Alembert principle, the inertial load is introduced as boundary condition in finite element analysis;Under the condition of the action of gunpowder gas with time varying law of Sergey Mamontov, the movement simulation analysis of crank connecting rod mechanism is carried out, and the law of crank and connecting rod overload and saltus is obtained;The dynamic deflection(deformation quantity) of crank connecting rod under inertia load is analyzed by finite element method. The results show that the connecting rod becomes the main source of vibration when the overload is more than 25 000 m/s~2. The dynamic deflection can be reduced by reducing the center distance of the rotating pair and the mass distribution near the centroid, thus reducing the dynamic deflection and reducing the flexible impact.

关 键 词：自动机 柔性冲击 动挠度 曲柄 连杆 

分 类 号：TH113[机械工程—机械设计及理论]