Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education

Tianjin, China

Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education

Tianjin, China
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Xu S.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Xu S.,Tianjin University | Liu Y.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Liu Y.,Tianjin University | And 4 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2017

Based on the NACA 4-digit airfoil, effects of the airfoil on flight performance, such as flight efficiency and static stability, were analyzed by using the method of computational fluid dynamics with the environment of commercial software ANSYS-FLUENT. Results show that appropriate airfoil may greatly improve the flight efficiency of AUGs, but the improvements to the static stability of the AUGs are not so obvious. For asymmetric airfoils, the camber and bending directions of the airfoil have great influences on both of flight efficiency and static stability. According to the present researches and combining with the engineering practices, the flexible wings with variable trailing edge were proposed to make the AUG get better flight performance, which was proved by the numerical simulation experiments. The present achievements provide theoretical guidance for the design of flexible wings of AUGs. © 2017, China Mechanical Engineering Magazine Office. All right reserved.


Li H.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Tian Y.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Li P.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Zhang L.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Wang Y.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education
Key Engineering Materials | Year: 2016

This paper introduces an optimization algorithm for rapid prototyping. In the optimization algorithm, several important influencing factors are considered, such as the molding direction, the extrusion speed, and layer thickness, etc. And the velocity and effectiveness of the method are validated experimentally. The algorithm can get the best molding direction and maximum hierarchical layer thickness. The method is comprehensive, overcoming the problems of current optimization methods for one-side shortcomings, and can make guidance for the adaptive slicing and path planning. © 2016 Trans Tech Publications, Switzerland.


Wang F.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Liang C.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Tian Y.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Zhao X.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education | Zhang D.,Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education
IEEE/ASME Transactions on Mechatronics | Year: 2016

The design and control of a novel piezoelectric actuated compliant microgripper is studied in this paper to achieve fast, precise, and robust micro grasping operations. First, the microgripper mechanism was designed to get a large jaw motion stroke. A three-stage flexure-based amplification composed of the homothetic bridge and leverage mechanisms was developed and the key structure parameters were optimized. The microgripper was manufactured using the wire electro discharge machining technique. Finite element analysis and experimental tests were carried out to examine the performance of the microgripper mechanism. The results show that the developed microgripper has a large amplification factor of 22.6. Dynamic modeling was conducted using experimental system identification, and the displacement and force transfer functions were obtained. The position/force switching control strategy was utilized to realize both precision position tracking and force regulation. The controller composed of an incremental proportional-integral-derivative control and a discrete sliding mode control with exponential reaching law was designed based on the dynamic models. Experiments were performed to investigate the control performance during micro grasping process, and the results show that the developed compliant microgripper exhibits good performance, and fast and robust grasping operations can be realized using the developed microgripper and controller. © 2016 IEEE.


Jing L.Y.,Key laboratory of mechanism theory and equipment design of ministry of education | Wang T.Y.,Key laboratory of mechanism theory and equipment design of ministry of education | Chen D.X.,Key laboratory of mechanism theory and equipment design of ministry of education | Fang J.X.,Key laboratory of mechanism theory and equipment design of ministry of education
Advanced Materials Research | Year: 2013

With the development of network technology and fault diagnosis technology, monitoring and diagnosis methods for the CNC machine tools had a great change. In this paper, an online monitoring and remote diagnosis system for CNC machine tools was built. The system was consisted of the multi-channel online acquisition system and remote fault diagnosis system. The online acquisition system achieved a real-time monitoring for CNC machine tools. The remote fault diagnosis system provided the management of devices and assistant for experts to analyze data which was uploaded from acquisition system. The system offered real-time state information of CNC machine tools and reduced downtime of machine effectively. © (2013) Trans Tech Publications, Switzerland.

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