摘要
针对混凝土泵车臂架回转系统的振动性能,基于多体动力学理论建立包括回转齿轮啮合驱动的臂架刚柔耦合动力学模型,对其动态特性和振动响应进行动力学预测分析。动力学仿真求解和试验测试结果表明,仿真模型与试验样机的固有频率误差为4%左右,阻尼比误差为13%,臂架末端横向振动位移曲线基本吻合,验证了动力学模型和仿真结果的准确性和有效性。通过对典型姿态下臂架回转系统的动力学预测,得到臂架在水平、弓形和L形姿态下的末端横向振动位移的最大幅值分别为1 300 mm、980 mm和244 mm;振动衰减时间分别为50 s、55 s和62 s;横向振动阻尼比分别为0.026 7、0.02和0.01;横向振动固有频率分别为0.224 6 Hz、0.253 9 Hz和0.302 7 Hz;预测分析结果为臂架的减振研究提供理论依据。
To study the vibration performance of boom slewing system of the concrete pump truck, a rigid-flexible coupling dynamic model including boom and slewing gear transmission was created to predict the dynamic characteristic and the vibration response based on multi-body dynamics theory. The solution of dynamic simulation and test results show that the error of natural frequency between the simulation model and the experimental prototype is about 4% , the error of damping ratio is 13% , and displacement curves of the boom tip horizontal vibration are nearly accordant that the pertinence evaluation factor reach 0. 95, so the dynamic model and the simulation results were verified to be accurate and valid. With dynamic prediction of the boom slewing system in typical posture, the results show that the maximum displacement amplitude of the boom tip horizontal vibration in horizontal, bow and L-type posture is 1300, 980 and 244 millimeter; damping time is 50 s, 55 s and 62 s; damping ratio is 0. 026 7, 0. 02 and 0. 01 ; natural frequency is 0. 224 6 Hz, 0. 253 9 Hz and 0. 302 7 Hz; Prediction and analysis results provide a theoretical basis for the study on boom vibration control.
出处
《机械强度》
CAS
CSCD
北大核心
2014年第2期300-304,共5页
Journal of Mechanical Strength
基金
国家自然科学基金资助项目(551305045)
湖南省自然科学基金资助项目(12JJ4039)~~
关键词
混凝土泵车
臂架回转系统
刚柔耦合
动力学模型
预测
Concrete pump truck
Boom rotary system
Rigid-flexible coupling
Dynamic model
Prediction
