The Mechanical Analysis And Optimization To Boom Of The Telescope Building Maintenance Unit

With the rapid development of construction industry in our country, building maintenance unit as the special equipment to clean, maintain and install the external walls. It becomes more and more widely available. At present, our country has already became the largest construction market. It puts forward a new topic that the operating equipment should keep the external wall beautiful and clean when construct and maintain it. Boom structure is the most important bearing parts of the building maintenance unit. The mechanical properties is very crucial to the working performance of the whole machine. Therefore, this paper aim at the telescopic building maintenance unit as the research object to do mechanical properties analysis for the important bearing parts about boom structure. On the basis of the structure optimization analysis, the improved structure about boom can be got. It lays a foundation of development and technical progress about telescopic building maintenance unit, which is of certain guiding significance for design and development of similar products.This paper based on the European standard and the new national standard revisions about building maintenance unit, obtained its structural characteristics under typical working conditions by establishing the simplified structures mechanical model about boom. Using APDL finite element model, strength analysis, stiffness analysis and the eigenvalue buckling analysis to it. And then obtain the stress and displacement distribution and maximum critical force.In the meantime, verify the validity of the finite element model which provide the basis for structure dynamic optimization. Secondly, combined with the whole machine structure and load characteristics to establish four degrees of freedom, three degrees of freedom, two degrees of freedom and single degrees of freedom vibration system about boom. Obtained the most simple vibration model, make use of ANSYS for modal analysis and harmonic response analysis. Extracting a position of the larger particle displacement, the relative displacement values and the resonance frequency range as well as to obtain optimal design variables and state variables.Finally, on the basis of the main failure mode about boom. According to different amount of overlap and different forms of lap, carried out comparative analysis of the structural performance of different schemes. Get the optimal amount of overlap, lap position and joint forms and use the optimization module of ANYSY to lightweight for boom in order that obtained the optimum section dimension and use static analysis to the optimized scheme. Verify the validity of the analysis that make sense for the research of the similar products.This paper takes the boom structure of CWG250 telescopic building maintenance unit as the research object, applies the research method of structural mechanics vibration mechanics and finite element theory to make mechanical analysis and optimization study of the boom structure under typical work condition. The results show that adjusting the amount of lap joint and joint forms, its performance is greatly enhanced. The results provide effective reference for the design and development of related products.