汽车起重机变幅系统的可靠性分析及安全评价

发布时间：2019-04-24 12:14

【摘要】：随着科学技术的发展和市场竞争的驱动，起重机等机械装备系统的性能和科技含量不断提高。但在高速发展的背后隐含许多安全问题，导致事故发生频繁，隐患不易发现，使得起重机械的可靠性和安全性相对于其他机械装备尤为突出，因此非常必要对起重设备的可靠性和安全性进行合理、全面、真实的分析和评价，及时发现事故隐患，并采取相应的对策和措施消除事故。以起重机对变幅系统为对象开展可靠性理论分析研究。首先利用贝叶斯网络建立可靠性分析模型，然后利用模糊集理论和专家评价法计算叶节点的概率，最后通过MSBNX（Microsoft Bayesian Network）工具箱对模型进行了根节点发生概率的计算和诊断推理，找出系统的薄弱环节并给出改进措施。在可靠性分析的基础上，，对变幅系统进行安全方法评价研究。首先利用故障模式与影响分析法，并结合模糊集理论与层次分析法，建立起重机变幅系统安全评价模型，对其安全性进行定性和定量的评价，最后给出整个系统安全等级及安全评分，根据评价结果提出的整改措施可有效地减少事故的发生。将上述安全评价的过程，依据Visual C++为开发平台，结合Access强大的数据库存储能力，开发出《起重机变幅系统安全评价系统》。通过工程实例验证，发现其评价结果与现场实际分析结果基本一致，能够全面快捷的反映系统的安全性。为起重机变幅系统安全评价提出了一个切实可行的综合评价方法和手段。
[Abstract]:With the development of science and technology and the drive of market competition, the performance and technology content of mechanical equipment systems such as cranes have been improved. But there are many safety problems hidden behind the high-speed development, which lead to frequent accidents, hidden dangers are not easy to find, which makes the reliability and safety of lifting machinery more prominent than other mechanical equipment. Therefore, it is very necessary to analyze and evaluate the reliability and safety of lifting equipment in a reasonable, comprehensive and real way, to find out the hidden trouble in time, and to take the corresponding countermeasures and measures to eliminate the accident. The reliability theory of crane for amplitude-changing system is studied in this paper. Firstly, Bayesian network is used to establish reliability analysis model, then fuzzy set theory and expert evaluation method are used to calculate the probability of leaf node. Finally, the root node occurrence probability of the model is calculated and diagnosed by MSBNX (Microsoft Bayesian Network) toolbox, and the weak links of the system are found out, and the improvement measures are given. On the basis of reliability analysis, the safety method evaluation of amplitude-varying system is studied. Firstly, using fault mode and influence analysis method, combining fuzzy set theory and analytic hierarchy process (AHP), the safety evaluation model of crane amplitude-changing system is established, and the safety of crane is evaluated qualitatively and quantitatively. Finally, the safety grade and safety score of the whole system are given. The corrective measures based on the evaluation results can effectively reduce the occurrence of accidents. According to the development platform of Visual C and the powerful database storage ability of Access, the safety evaluation system of crane amplitude-changing system is developed according to the above-mentioned process of safety assessment. Through the verification of engineering examples, it is found that the evaluation results are basically consistent with the actual results of field analysis, and can reflect the security of the system in an all-round and rapid manner. This paper puts forward a feasible comprehensive evaluation method and means for the safety evaluation of crane amplitude changing system.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH213.6

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