【作者】 李同焕；

【导师】 王智明；

【作者基本信息】 吉林大学 ， 机械设计及理论， 2007， 硕士

【摘要】 本文针对吉林恒安电子机械有限公司生产的产品五型救生缓降器在设计应用过程中所出现的问题进行了研究。从理论上,对缓降器整体结构进行了改进设计,确定了缓降器的技术参数。为了缩短产品的研发周期、降低生产成本,本文利用UG的二次开发功能,基于VC++语言,建立了缓降器的计算机辅助设计系统,包括缓降器的参数化建模和优化设计模块,事实证明此系统对于缓降器的研发工作具有很大的实用价值。利用此系统对改进的缓降器结构进行了体积最优化,在满足强度的条件下,减小了体积,降低了生产成本,同时根据优化结果,完成缓降器的参数化建模工作,并基于在UG中建立的虚拟样机,利用UG/Motion、UG/Structure模块,分析了缓降器的动力特性,并对缓降器主要受力部件进行了有限元分析。通过实验分析,验证了研究、仿真分析结果的正确性,改进了五型救生缓降器的不足之处,最终研究设计出更加优秀的产品六型救生缓降器。本文研究的成果对以后缓降器的设计研发工作将具有重大的指导意义。更多还原

【Abstract】 A lifesaving descending device is for emergent escape from a high building, and it is widely used in hotel、apartment、hospital、house and so on. It can be used as building rescue device when emergency happens and used as high altitude working device usually.Descending device is a kind of new product which is developed in these years, and there hasn’t been an integrated design system. A lot of deficiencies come forth in practice, for instance, short service life、occurrence of great impact when people falling to the ground、complicated structure、large volume、inconvenient operation、high price and so on. Descending device which is a product of Jilin Hengan Electron Machinery Co.Ltd is redesigned、optimized and analysed. On the condition of satisfying the material strength, the volum、the developing cycle and the cost are reduced. A better one which named JSH-100/35-30 is achieved and the deficiencies are improved. The following contents are studied in this thesis.(1) Theoretically, descending device’s structure is redesigned and improved、technical parameters are determined based on the original design parameters and theoretically analyzes the improved gears whether satisfy the intensity requests. Theoretical calculation results will be used to examining the results of simulation and lay the foundation for the following analysis.(2) For the sake of making the course of design automatic and shorting the develop cycle, in this thesis, a descending device’s CAD system which comprises 3D parametric modeling and optimum design function is built based on UG/Open API、UG/Open MenuScript、UG/Open UIStyler、VC++, etc. Descending device’s 3D parametric modeling and optimum design are accomplished with the system, and satisfying results that the volume is 0.897 times the size of JSH-100/35-30 descending device、reducing the cost、shortening the develop cycle are achieved. Through comparing the results of program with results which are achieved from MATLAB’s optimization box, proved that the program is available. The CAD system can be used in descending device’s design and have great practical value.(3) A virtual prototype is built using UG/Motion module based on the results of the optimization above. Through dynamics simulation analysis, component’s contact dynamic and kinematic characteristics are accurately displayed while the virtual prototype working and computer simulating of the gear dynamic contact force is realized. The speed of rope wheel is 0 .89m/sand the transmission ratio error is 3.16% which is smaller than 4% , from which we can find that the optimized structure satisfies the design requests. Through experimental analysis, we can find that the experimental results are consistent with the simulation results which will provide the reliable reference data for the product research.(4) The finite element analysis of principal axis that is the supporting component and the planetary gear sets are performed using UG/Structure module, and the biggest stress of principal axis and the biggest tooth root bending stress、contact stress of tooth surface are achieved. From analysis and the comparison of theoretical calculation and simulation results, we can find that the product which is optimized based on the original satisfies the material intensity requests and the manufacture implementation feasibility is guaranteed.Research fruits and methods in this thesis have important theory and project reference value. Using the virtual prototype to replace the physical prototype, we can not only confirm the design feasibility in real time, simulate its future active status and movement behavior and discover the design errors in time, confirm the reliability of its function and performance, make the design process automatic, avoid the expensive and time consuming physical experiment, but also have the product met the design requests and the manufacture implementation feasibility is guaranteed. There will be great practical significance to reducing the manufacturing times of physical prototype、product development cycle、research and development cost, enhancing the production efficiency and product quality.更多还原