多级组合型大角度变幅机构的动力学特性

来源期刊:中南大学学报(自然科学版)2019年第6期

论文作者:朱建新 朱振新 唐博豪 顾林坤 钱奂云

文章页码:1334 - 1343

关键词:变幅机构;动力学方程;变幅方式;仿真分析

Key words:luffing mechanism; dynamic equation; luffing method; simulation analysis

摘    要:为研究自主设计的多级组合型大角度变幅机构的动力学特性,采用层次化的求解方法,计算该变幅机构的位置正解方程、位置反解方程、一阶速度雅可比矩阵和二阶加速度海森矩阵,再建立该变幅机构关于主动副的标准形式拉格朗日动力学方程。基于MATLAB仿真分析2种变幅方式下前液压缸和后液压缸的载荷情况,搭建多级组合型大角度变幅机构的试验平台并进行试验研究。研究结果表明:该动力学模型能够预测多级组合型大角度变幅机构的动力学特性,与后液压缸先收缩再前液压缸收缩的变幅方式相比,前液压缸先收缩再后液压缸收缩的变幅方式具有更优的力学性能。

Abstract: In order to research the dynamics characteristics of multi-stage combined type large angle luffing mechanism, the hierarchical method was used to deduce forward kinematics equations, inverse kinematics equations, the first-order velocity Jacobian matrix, and the second-order acceleration Hessian matrix. Then Lagrange dynamics equation with standard form about the actuators of luffing mechanism was established. Based on the MATLAB function, the mathematical model was used to simulate and analyze the load of front hydraulic cylinder and back hydraulic cylinder using two kinds of luffing methods. The load of cylinder also was studied by building test platform of luffing mechanism. The results show that the mathematical model can predict the dynamics characteristics of multi-stage combined type large angle luffing mechanism, and the luffing method in which the front hydraulic cylinder retracts first show better mechanical behavior than the luffing method in which the back hydraulic cylinder retracts firstly.

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