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| Abstract: |
| Variable crank length cam-linkage mechanism has attracted much attention due to its compact overall structure when realizing complex motion laws. According to the special trajectory requirements, the kinematic characteristics and parameters of the mechanism have been analyzed and solved, which lays foundation for the implementation of the variable crank length snow melting agent throwing mechanism designed in this paper. Based on the trajectory equation of the point, the mathematical model of the throwing mechanism was established, and the theoretical trajectory of the end point of the throwing mechanism was obtained by programming. The parametric modeling and trajectory drawing were carried out by computer aided three-dimensional interactive application (CATIA), and the correctness of the mathematical model was verified by comparison. The regional trajectory distribution characteristics of the end points of the throwing mechanism were studied by using the trajectory region location method, and the influence of various parameters on the trajectory was investigated by using the numerical cycle comparison method. The human-computer interaction system of snow melting agent throwing mechanism with variable crank length was constructed by using Microsoft Visual Basic (VB) software. Based on the restriction conditions, the optimum combination of structural adjustment parameters and operational parameters suitable for Harbin first-class roads was obtained by using orthogonal test table, which provides an effective method to solve the parameters of the variable crank length cam mechanism with smooth impulse trajectory. |
| Key words: throwing mechanism variable crank length cam mechanism mathematical model kinematic characteristics parametric solving |
| DOI：10.11916/j.issn.1005-9113.2019059 |
| Clc Number:TH132.2 |
| Fund: |
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| Descriptions in Chinese: |
| 变曲柄长度融雪剂抛撒机构运动特性分析与参数求解 刘文武1，陆念力2，刘宏新1 （1. 东北农业大学 工程学院，哈尔滨 150030； 2. 哈尔滨工业大学 机电工程学院，哈尔滨 150001） 摘要：变曲柄长度凸轮连杆机构由于其具有实现复杂运动规律的同时，整体结构紧凑的特点而受到关注，针对特殊轨迹要求进行机构的运动特性分析与参数求解，为本文设计的变曲柄长度融雪剂抛撒机构的实施奠定基础。由点的轨迹方程建立了抛撒机构的数学模型，通过编程求解得出抛撒机构端点的理论轨迹，利用CATIA（computer aided three-dimensional interactive application）进行参数化建模与轨迹绘制，通过对比验证所建立数学模型的正确性；运用轨迹区域定位法，研究抛撒机构端点的区域轨迹分布特性；运用数值循环比较法，研究各参数对轨迹的影响规律，利用VB（Visual Basic）软件构建了变曲柄长度融雪剂抛撒机构的人机交互系统，结合约束条件，采用正交试验表求得适合于哈尔滨市一级道路的最佳结构调整参数和作业参数组合，为实现脉冲式光滑轨迹的变曲柄长度凸轮机构的参数求解提供有效方法。 关键词：抛撒机构；变曲柄长度凸轮机构；数学模型；运动学特性；参数求解 |
