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Modeling Method for Assembly Variation Propagation Taking Account of Form Error

Chinese Journal of Mechanical Engineering 2013年第4期26卷 641-650页

作者： ZUO Fuchang JIN Xin ZHANG Zhijing ZHANG Tingyu School of Mechanical Engineering Beijing Institute of Technology

The propagation of variations, such as fixture errors and datum errors resulting from assembly and machining processes, has been extensively studied. However, only a few studies that focus on form error propagation in assembly systems have been implemented. Machining errors, especially form errors, have great impact on assembly accuracy and accuracy stability of precision mechanical systems. With form errors being the research object, a method for calculating mating variation and specifying mating coordinate is proposed to improve the accuracy of the variation propagation model. Taking into account the form error of mating surfaces, the assembly variation propagation of a precision mechanical system is analyzed, and the brief derivation procedure of the variation propagation model is introduced afterwards. The variation propagation model involves a new concept of mating variation specified by the two mating surfaces. An innovative method, the difference surface search based method, is proposed to calculate the mating variation amongst the mating surfaces. The obtained mating variation is then utilized to specify the mating coordinate in the variation propagation model. Moreover, FEM is employed to simulate the contact state of the two mating surfaces to demonstrate effectiveness of the proposed method. Meanwhile, the mating variation and mating coordinate obtained are incorporated into the assembly variation propagation model, which is then verified by a following case study through a comparison between the calculated results and the experimental results. The comparing results indicate that the established model improves the prediction of assembly accuracy. The developed model enables the investigation of various fundamental issues in variation reduction, including variation analysis, process monitoring, accuracy prediction, and accuracy control.

关键词： variation propagation precision mechanical system form error difference surface contact point

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ANALYSIS OF THE SINGULARITY FOR THE VERTICAL contact PROBLEM OF LINE CRACK-INCLUSION

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Applied Mathematics and Mechanics(English Edition) 2001年第6期22卷 630-636页

作者：沈安陶昉敏汤任基 Department of Engineering Mechanics Shanghai Jiaotong University 200030 Shanghai P R China

Taking the short-fiber composite materials as engineering back-ground, utilizing the existing basic solutions of single inclusion and single crack, the plane problem of vertical contact interactions between line crack and rigid line inclusion in infinite plane (matrix) from the viewpoint of crack fracture mechanics is studied. According to boundary conditions, a set of standard Cauchy-type singular integral equations of the problem is obtainable. Besides, singular indexes, stresses and stress intensity factors around the contact point are expressed. Numerical examples are given to provide references to engineering.

关键词： crack line inclusion the vertical contact point singular stress stress intensity factor

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Research on Adjust Time of Premium

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Journal of Systems Engineering and Electronics 2000年第2期11卷 1-4页

作者： Rong, Ximin Zhang, Shiying Dept. of Mathematics Tianjin University 300072 P. R. China School of Management Tianjin University 300072 P. R. China

By considering economic strength and economic profit of insurance company, this paper presents a concept-contact point, and gives premium expectation adjust-time model which provides more practical significance for insurance company to make rational adjustment of premium. Finally, an illustration is given to show their application.

关键词： contact point Expectation Adjust time Assets

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Whole Arm Manipulation Using Closed and Hybrid Planar Chains:a Kinematic Study

Whole Arm Manipulation Using Closed and Hybrid Planar Chains...

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第十一届IFTOMM世界大会

作者： S. C . Pilli T. S. Mruthyunjaya Department of Mechanical Engineering Indian Institute of Science Bangalore-560012India Department of Mechanical Engineering Indian Institute of Science Bangalore-560012India

＜正＞This paper studies planar whole arm manipulation of a circular object using closed loop and hybrid manipulators. The manipulation is simple with fewer degrees of actuation than the task space. This is an useful operation if the initial and final positions of the object are on the same surface. Closed loop manipulator is a 4/5 bar mechanism. In hybrid manipulators a open loop manipulator with 3/4 links is attached to the floating link of 4/5 bar mechanism. The mobility analysis is carried out to find the connectivity of the object with reference to frame. The manipulation （forward kinematics） starts from a given configuration of the object and the manipulator. In hybrid manipulators determination of initial configuration involves inverse kinematics of open loop manipulator. The input joint velocities are used to demonstrate the manipulation. Conditions are specified for prehensile manipulation.

关键词： Manipulation Nonprehensile Hybrid contact point Connectivity

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