Design And Analysis Of Large Span And Scalable Test Device For Zero-gravity Simulation

With the development of the space station and deep detection technology, the fold expansion solar wing is using more and more, higher requirements for its quality is put forward also, and the demand of its ground zero-gravity expand test is growing at the same time. In order to facilitate utilization of the test device and save space, improve the flexibility and response speed of the test device, this paper presents a movable, scalable and automatic levelling solar wing ground zero gravity expand test device This device has the characters of high-precision, low friction, large span and large stiffness.According to the technical requirements, the paper develops the overall scheme, design a two-stage hybrid telescopic lifting beam system seated by coarse adjustment and located by fine tune. The mechanical system of the device uses the spring and the strings system to solve the problem of the leveling and lock condition to eliminate the gap, which can provide a guarantee for the stability work of the system. This paper uses a combination of rigid joint and hinge joint to solve the big span installation problem. The structure design is accomplish with the help of Solid Works and Auto CAD, the three-dimensional model of the mechanical system and the two-dimensional engineering drawings of the assemblies and parts are got.In view of the structure, this paper establishes an efficient and high-precision mathematical model to calculate the equivalent stiffness of the system, gets the calculation formula, and verifies the correctness of the formula by SAP84. The finite element models of platform, rocker arm frame and the whole machine, have been established by ANSYS, then the static analysis of the finite element models has been carried on about their deadweight and loading. The data of static analysis shows, stiffness and strength meet the requirements of the index.This paper analyzes the dynamic characteristics of the system, including modal analysis and transient dynamic analysis. From modal analysis, the top 10 vibration mode and the natural frequency of the system is got, which can be used as the theory to avoid the resonance. Then the transient dynamic analysis is done under the controlling variable method about the pulse exciting force, and the time-history response of the displacement about the force functional node of the platform was drawn. Linked with the high level degree and the sensitivity requirement of the angle sensor, the value range about the pulse exciting force is defined, which can be used to guide the fine tuning of the level degree.Finally, with the help of the engineering drawings, the processing and on-site assembly is done, which verifies the feasibility of the method about the big span installation. The result of the adjustment indicates the device can satisfy the requirements of the high levelness.The innovative designs of the movable, scalable and automatic levelling solar wing ground zero gravity expand test device in this paper will provide much value to research about the similar device, and the successful of the manufacture and assembly about the device can proved much material to the production of the similar device.