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Design, Modeling and Application of Three-axis Rotational Flexure Hinges with High Axial Stiffness

Author: ChengLei
Tutor: WangDaiHua
School: Chongqing University
Course: Instrument Science and Technology
Keywords: Flexible Joints Three-axis rotation Stiffness Finite Element Stiffness theory Six-dimensional vibration isolation
CLC: TH133.2
Type: Master's thesis
Year: 2008
Downloads: 76
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Abstract

Common Flexure usually a rigid metal material with wire cutting processing a rectangular or circular shaped incision formation of elastic fulcrum, and passed it around the axis of the flexible support system for complex motion limited angular displacement convert linear motion. Flexure hinges can only provide a limited degree of rotation angle, but with no friction, no wear, no lag, no lubrication, maintenance and simple, but also has a compact structure, small size, no movement clearance and resolution advantages is widely used in the field of precision machinery, precision measurement, micro / nanotechnology constitute a high-precision positioning mechanism and system. In the process of the six-dimensional vibration isolation platform, combined with the vibration characteristics of a micro-movement coupling mechanism between the legs with the platform should have high axial stiffness and low bending and torsional stiffness, that the three-axis rotation capacity; At the same time security and stability requirements work, difficult to damage. So far, most of the connection between the institutions in the six-dimensional vibration isolation platform legs and platform uniaxial or biaxial flexure hinges, elastomers, and even ball joints. The traditional ball joints due to the presence of friction, clearance and lubrication problems, it is difficult to adopt high precision vibration isolation uniaxial, biaxial flexure hinges and elastomer bending and torsion, but it can not completely replace the function of the three-axis flexure hinges. The performance of the coupling mechanism between the legs and the platform of the six-dimensional vibration isolation platform directly affect the final performance of the six-dimensional vibration isolation platform. This article will complete a new high axial stiffness of three-axis rotation of the flexible hinge design and its finite element simulation, the stiffness calculated isotropic stiffness theoretical studies as well as structural improvements. This paper also describes the structure and systems of the six-dimensional vibration isolation platform based on the high axial stiffness of three-axis rotation of the flexible hinge, master-slave control system of distributed control mode to complete the six-dimensional vibration isolation platform preliminary structures. The main research work and achievements include: 1, design and improvement of a new high axial stiffness triaxial rotating flexible joint, said the two new high axial stiffness triaxial rotating flexible hinge according to their structural characteristics were hollow The cylindrical arc incision flexible joints and hollow cylindrical mixing incision Flexure. The principles and methods of using the finite element technique of bending stiffness, torsional stiffness and axial stiffness. On this basis, notched Flexure a hollow cylindrical arc incision Flexure and hollow cylinder hybrid stiffness finite element analysis, to establish the arc incision flexible hinge of the hollow cylinder and hollow cylinder hybrid incision Flexure to The finite element model stiffness with changes in key structural parameters of the flexible hinge and quadratic fitting equation. 2, the hollow cylindrical arc incision flexible hinge stiffness theory, summarizes the major steps in the theoretical study of a flexible hinge stiffness, bending stiffness and torsional stiffness complete theoretical model derived, the theoretical model and finite element analysis model compared. A key part of the flexible hinge axial deformation analysis pointed out the direction of the the flexure hinges axial stiffness formula of derivation. 3 based on Flexure six-dimensional structural characteristics of vibration isolation platform based on the high axial stiffness of three-axis rotation, the main completed a six-dimensional vibration isolation platform control system initially built from distributed control.

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