A Novel Dynamic Method to Improve First-order Natural Frequency for Test Device
Author:
Zhang Jun1, Tian Yu1, Ren Zongjin1, Shao Jun1, Jia Zhenyuan1
Affiliation:
1. Faculty of Mechanical engineering, Dalian University of Technology, Dalian , China
Abstract
Abstract
It is important to improve the natural frequency of test device to improve measurement accuracy. First-order frequency is basic frequency of dynamic model, which generally is the highest vibration energy of natural frequency. Taking vector force test device (VFTD) as example, a novel dynamic design method for improving first-order natural frequency by increasing structure stiffness is proposed. In terms of six degree-of-freedom (DOF) of VFTD, dynamic model of VFTD is built through the Lagrange dynamic equation to obtain theoretical natural frequency and mode shapes. Experimental natural frequency obtained by the hammering method is compared with theoretical results to prove rationality of the Lagrange method. In order to improve the stiffness of VFTD, increase natural frequency and meet the requirement of high frequency test, by using the trial and error method combined with curve fitting (TECF), stiffness interval of meeting natural frequency requirement is obtained. Stiffness of VFTD is improved by adopting multiple supports based on the stiffness interval. Improved experimental natural frequency is obtained with the hammering method to show rationality of the dynamic design method. This method can be used in improvement of first-order natural frequency in test structure.
Publisher
Walter de Gruyter GmbH
Subject
Instrumentation,Biomedical Engineering,Control and Systems Engineering
Reference21 articles.
1. [1] Liu, J., Meng, X.H., Zhang, D., Jiang, C., Han, X. (2017). An efficient method to reduce ill-posedness for structural dynamic load identification. Mechanical Systems and Signal Processing, 95, 273-285. 2. [2] Hessling, J.P. (2011). Propagation of dynamic measurement uncertainty. Measurement Science and Technology, 22 (10). 3. [3] Du, C., Zhang, J., Lu, D., Zhang, H., Zhao, W. (2016). A parametric modeling method for the pose-dependent dynamics of bi-rotary milling head. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 232, 797-811. 4. [4] Albrecht, A., Park, S.S., Altintas, Y., Pritschow, G. (2005). High frequency bandwidth cutting force measurement in milling using capacitance displacement sensors. International Journal of Machine Tools and Manufacture, 45, 993-1008. 5. [5] Li. Y.J., Wang, G.C., Zhang, J., Jia, Z.Y. (2012). Dynamic characteristics of piezoelectric sixdimensional heavy force/moment sensor for large-load robotic manipulator. Measurement, 45, 1114-1125.
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
|
|