工程设计学报2023，Vol.30Issue(6)：728-737,10.DOI:10.3785/j.issn.1006-754X.2024.03.165
多激励下新型纵轴式掘进机的纵向振动特性预测
Prediction of longitudinal vibration characteristics of new vertical-axis roadheader under multiple excitation
摘要
Abstract
In view of the problems of parts damage and stability reduction caused by a large amount of vibration during roadheader cutting,the vibration characteristics of the new vertical-axis roadheader was analyzed and predicted based on the longitudinal cutting condition.Firstly,the force on the cutting head of the roadheader was analyzed,and the force on the track was analyzed by Bekker subsidence theory.Then,taking the contact force between track and bottom plate and the cutting load as external excitation,the longitudinal nonlinear dynamics model of roadheader was established by using Lagrange equation.Next,based on the Runge-Kutta variable step size algorithm,the dynamics model of roadheader was solved using MATLAB software,and the solution results were compared with experimental results to verify the correctness of the dynamics model.Finally,the dynamics model was used to predict the vibration displacement of key parts of the roadheader under different stabilizing mechanism stiffness.The results showed that the vibration of the whole roadheader was in a chaotic state under the combined influence of multiple external excitation.The roll vibration displacement was small,and the pitch vibration was dominant.With the increasing of the stabilizing mechanism stiffness,the vibration displacement of key parts of the roadheader showed a significant decreasing trend.When the stiffness of the stabilizing mechanism increased to 3 times of the initial stiffness,the vibration displacement of the roadheader body decreased by 29%,the vibration displacement of the cutting arm decreased by 22%,and the vibration displacement of the cutting head decreased by 20%.The research results prove that the vibration response of roadheader can be reduced effectively by increasing the stiffness of stabilizing mechanism,which provides theoretical basis for the stability improvement and structural optimization of roadheader.关键词
纵轴式掘进机/非线性振动/动力学模型/振动位移/支稳机构刚度Key words
vertical-axis roadheader/nonlinear vibration/dynamics model/vibration displacement/stiffness of stabilizing mechanism分类
机械制造引用本文复制引用
谢苗,石俊杰,张鸿宇,朱昀..多激励下新型纵轴式掘进机的纵向振动特性预测[J].工程设计学报,2023,30(6):728-737,10.基金项目
国家自然科学基金面上项目(51874158) （51874158）
辽宁省教育厅重点攻关项目(LJ2019ZL003) （LJ2019ZL003）
