Micro-Spring’s Variable Stiffness Design and Characteristics Analysis

Abstract:

The variable stiffness micro-springs’ load and deformation have nonlinear relationship, thus they can be used in special occasions. MEMS processing technology can manufacture any complex structures in a plane, using this feature, a variable stiffness design idea for the planar micro-spring is proposed. That is, using one type of structure named contact pairs to achieve stiffness change during the micro-spring’s stretching process. Using contact pairs, two types of variable stiffness springs are designed: stiffness increase spring and stiffness convexity spring. Because of the influence of processing precision, the contact pairs’ sizes of the first type of variable stiffness spring are different each other, the machining error makes the test results and simulation results various. In order to avoid the above problem of above spring, this paper designs another two variable stiffness micro-springs, test results indicate that the improved variable stiffness springs can realize the variable stiffness’ tendency.

• Periodical: Key Engineering Materials (Volumes 645-646)
• Pages: 830-835
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.645-646.830
• Online since: May 2015
• Authors: Guo Hua Liu, Li Sui*, Geng Chen Shi, Xu Hong Guo
• Keywords: Characteristic Curve, Contact Pair, Micro-Spring, Stiffness Convexity Spring, Stiffness Increase Spring, Variable Stiffness

References

[1] Hrishikesh Deo, Nam P. Suh, Pneumatic suspension system with independent control of damping, stiffness and ride-height, in Proceedings of the Tony Stockman 4th International Conference, (2006).

[2] Li Sui, Zhen Wang, and Geng-chen Shi, MEMS variable stiffness spring and its application in fuze, Sensors and Transducers. 168 (2014) 101-107.

[3] Shi Peichang, Gong Jiancheng, Vehicle suspension coil springs variable stiffness optimized design, Modern Manufacturing Engineering. 11 (2006) 112-114.

[4] Ling Kaifu, Application research of cone spiral spring on locomotive vehicle, Journal of Zhuzhou Institute of Technology. 15, (2001) 48-51.

[5] Lei Lei, Zuo Shuguang, Yang Xianwu, et al., Study of stiffness calculation and test of barrel-shaped helical spring in suspension of vehicles, Journal of Machine Design. 28 (2011) 15-17.

DOI: 10.1109/iccda.2010.5541134

[6] Enlai Zheng, Fan Jia, Zhisheng Zhang, et al., Modeling and simulation of nonlinear combination disc-spring vibration, Advanced Materials Research. 211-212 (2011) 40-47.

DOI: 10.4028/www.scientific.net/amr.211-212.40

[7] Junho Choi, Seonghun Hong, Woosub Lee, et al., A variable stiffness joint using leaf springs for robot manipulators, in Proceedings of the IEEE International Conference on Robotics and Automation. 1(2009) 4363-4368.

DOI: 10.1109/robot.2009.5152716