Dynamics, Vibrations and Control Lab Equipment Design
Dynamics, Vibrations and Control Lab Equipment Design
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动力学、振动和控制实验室设备设计
DOI：
10.1115/dscc2018-8913
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Chong Tian
中科院分区：
文献类型：
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作者：
Ayse Tekes;K. D. Horn;Zach Marr;Chong Tian
带回家的实验室设备和动手学习工具仍然是控制理论和振动课程的需求。现有的设备非常昂贵，需要很大的实验室空间。本研究的目的是建立振动机械系统，是紧凑的，模块化的和小规模的，使每个学生都可以在他们的设置工作，并把它带回家，如果必要的。为此，在本研究中，设计了一种半柔性机构，用于系统控制和振动课程，这将提高学生的理解，通过实验演示的理论系统。与市售设备相比，该设计的优点是成本低，结构简单。
设计了一种由多个可连接在滑块上不同点的柔性连杆组成的平行臂机构，在Solidworks中进行有限元分析（FEA），并使用聚乳酸（PLA）和聚对苯二甲酸乙二醇酯（PETG）长丝3D打印柔性梁。不同的配置的机制进行了探讨，通过改变连接到滑块的柔性梁的数量。所提出的机构的数学模型可以表示为一个单一的质量和多个弹簧并联。由于质量是一个已知的属性，等效刚度可以从自由响应的频率分析中通过实验找到。为此，一个PCB模型三轴加速度计连接到滑块和运动方程推导出的投诉双臂机构的频率特性的分析，为每种配置。包括等效摩擦力的系统属性是从加速度与时间的数据，使用对数衰减。强迫响应研究附加负载的质量通过滑轮系统。通过LabVIEW实验获得了加载挠度曲线。由于系统参数是由自由响应得到的，因此在相同的初始位移和力输入下，Matlab Simulink模型输出与实验数据进行了验证。
Take home lab equipment and hands-on learning tools are still in demand for control theory and vibrations courses. The existing equipment are extremely expensive and require wide lab space. The aim of this research is to build vibratory mechanical system that is compact, modular and small scale so that each student can work on their setup and take it home if necessary. For this purpose, in this study, a semi-compliant mechanism is designed to be utilized in systems control and vibrations courses which would enhance the understanding of students by using experimental demonstration of the theoretical systems. The superiorities of the design over commercially available equipment are their low cost and simplicity.
A parallel arm mechanism consisting of several flexible links that can be attached at different points on the slider is designed, finite element analysis (FEA) is performed in Solidworks, and the flexible beams are 3D printed using polyactic acid (PLA) and Polyethylene terephthalate glycol-modified (PETG) filaments. Different configurations of the mechanism are explored by changing the number of flexible beams attached to the slider. The mathematical model of the proposed mechanism can be represented by a single mass and multiple springs in parallel. Since mass is a known property, the equivalent stiffness can be experimentally found from the frequency analysis of free response. For this purpose, a PCB model tri-axial accelerometer is attached to the slider and the equations of motion are derived from the analysis of frequency characteristics of the complaint dual arm mechanism for each configuration. System properties including the equivalent friction are obtained from the acceleration vs time data using logarithmic decrement. The forced response is studied by attaching a load to the mass through a pulley system. The load deflection curve is obtained experimentally from LabVIEW. Since the system parameters are obtained from the free response, Matlab Simulink model outputs for the same initial displacement and force input are verified with the experimental data.