Structural Optimization Design And Stability Analysis Of Large Orbital BMU

Building Maintenance Unit (BMU) is a special equipment mainly applied in the externalwall’s cleaning, maintenance and renovation of high-rise buildings, and it is graduallyreplacing the traditional construction platform for its advantages, such as high constructionefficiency, fast speed, high safety and energy saving and environmental protection. In recentyears, with the continuous development of China’s urbanization, the number of high-risebuildings is continually increased, and the BMU application that comes along is becomingmore and more extensive. At the same time, people also put forward higher requirements onits structure’s security, reliability and economy. However, the current design of the BMU inChina are mostly using the traditional design methods like analogy and intuitive, which notonly results in the unreasonable structural design, the waste of materials and increasingproduction costs, but also buries a security risk for the subsequent use. In order to improve theoverall performance and design level of BMU, the paper adopts the theoretical method andfinite element numerical analysis method, and makes the analysis and research on thecurrently widely used orbital BMU. Its main contents are as follows:1. Appling basic academic knowledge like theoretical mechanics, material mechanics andelastic mechanics, making analysis on stress of telescopic boom, wheel pressure ofunderframe, contact stress between the balance wheel set with telescopic cylinder andstiffness of pillar, the overall stability and local stability of the BMU, correspondingtheoretical formulas are derived; by using finite element analysis method, making analysis oncontact stress between the balance wheel set with telescopic cylinder and local stability ofpillar, the result indicates that this article’s theoretical method is reasonable and reliable.2. Using knowledge related to kinetic theory, deriving the calculation formula of naturalfrequency of the telescopic boom and dynamic response function on the front end oftelescopic boom under lifting impact load, and making the finite element validation of theconcluded theoretical results, what’s more, verifying the reliability of theoretical solution;Finally, analyzing the affected factors on dynamic response of BMU telescopic boom.3. Based on ANSYS Macro file, customizing the ANSYS user toolbar buttons, perfectingthe alternation interface of telescopic boom analysis of BMU.4. Design the APDL language based on ANSYS parameterization, making parametricmodeling, structural static analysis and modal analysis on the telescopic boom of BMU,establishment and analyze of the model only need click on the corresponding button and enterthe corresponding basic parameters, and the rest is completed by the program automatically,which greatly improves the degree of automation on structure analysis.5. Making optimization design analysis on telescopic boom’s structure of BMU byANSYS optimization module, obtaining the ideal scheme of optimization design, and makingcalculation and analyze on the resulting optimization scheme, verifying the reliability of theoptimization design.Relevant achievements to this paper has some theoretical guidance for the developmentof new BMU products, and provides a technical basis and calculation methods for the structure design and optimization of BMU simultaneously.