电连接器锁紧分离机构可靠性设计方法的研究

发布时间：2018-01-08 11:09

本文关键词：电连接器锁紧分离机构可靠性设计方法的研究　出处：《浙江理工大学》2017年博士论文　论文类型：学位论文

【摘要】：分离脱落电连接器作为型号系统实现电信号连接与分离的关键元器件,在型号系统的覆盖率较高,近几年由于其可靠性问题导致型号系统不能按时发射的事故时有发生,不仅造成重大的经济损失,还导致严重的后果。锁紧分离机构是实现电连接器可靠连接与分离的关键部件,也是分离脱落电连接器可靠性的薄弱环节,据统计,在分离脱落电连接器可靠性问题中涉及分离性能的约占66.7%,如JF2型分离脱落电连接器曾多次出现输入电分离信号后不能正常解锁分离。究其原因,在于我国分离脱落电连接器锁紧分离机构系仿制国外产品,机构分离的动力学特性及其影响规律、失效模式及机理不清,同时缺少相应的可靠性建模与设计方法。因此,本文以JF2分离脱落电连接器的锁紧分离机构为研究对象,开展考虑碰撞的动力学特性分析,研究分离性能的影响规律,研究其可靠性建模与评估方法,以及可靠性优化设计方法,从而提高锁紧分离机构的可靠性,对确保型号发射的成功率有着重要的意义。第一章,阐述了本文的研究背景和意义。分析总结了可靠性的发展历史及现状、机械可靠性的发展及存在问题、分离脱落电连接器的可靠性研究现状与存在的问题,在此基础上提出了本文的研究目标和研究内容。第二章,锁紧分离机构动力学特性分析。基于锁紧分离机构的结构及工作原理,将其解锁分离过程分为一级解锁、碰撞、二级解锁及头座分离四个阶段,利用拉格朗日方程、Hertz接触等理论建立了考虑碰撞的机构动力学理论模型,为锁紧分离机构的可靠性分析、建模与评估以及可靠性优化设计奠定了基础。第三章,锁紧分离机构动力学仿真分析与实验验证。利用ANSYS Maxwell和ADAMS软件建立了锁紧分离机构的参数化动力学仿真模型,对比仿真与动力学理论模型求解结果,初步验证了理论模型与仿真模型的正确性。通过电磁铁动态位移特性实验及高速图像测量技术获取了锁紧分离机构分离过程的运动特性曲线,对比仿真数据与理论数据,进一步验证了理论模型与仿真模型的正确性。第四章,锁紧分离机构失效分析。给出了锁紧分离机构失效的定义,确定了失效判定准则;借助仿真模型,分析了各种因素对锁紧分离机构解锁分离性能的影响;应用FMEA方法对锁紧分离机构进行了可靠性分析,确定了其主要失效模式及薄弱环节;结合动力学模型,量化了锁紧分离机构失效判据,为可靠性建模、评估及可靠性优化设计提供了依据。第五章,锁紧分离机构可靠性建模。确定了锁紧分离机构的可靠性特征参量及可靠性指标;建立了锁紧分离机构可靠性结构层次,建立一级解锁、碰撞、二级解锁及头座分离安全边界方程;确定了机构几何尺寸、材料性能、载荷及电性能参数的分布规律;提出了随机拟蒙特卡洛可靠性计算方法;得到了锁紧分离机构分离可靠度为99.83%,未到达可靠性指标99.99%的要求,需进行可靠性设计。第六章,锁紧分离机构可靠性设计。提出了锁紧分离机构在满足可靠度指标的条件下,使机构基本尺寸变化最小为优化设计准则;利用随机拟蒙特卡洛法进一步分析了机构随机变量对可靠度的影响规律,确定了电解锁弹簧、拉杆弹簧及分离弹簧的丝径、中径及有效圈数等参数为设计变量,以各参数的变化率绝对值最小为目标函数,以设计变量对应弹簧的旋绕比、强度、防并圈条件及几何关系等为确定性约束,机构分离可靠度大于99.99%为概率约束,建立了锁紧分离机构一致性优化(AAO)可靠性设计模型;鉴于模型维数较高,提出了目标级联法(ATC)和基于随机拟蒙特卡洛法的可靠性优化策略,从而实现了对锁紧分离机构分离可靠性的优化设计。最后,对全文的研究工作进行了总结,并对下一步工作进行了展望。
[Abstract]:Detached from electrical connector as a model system to realize electrical connection and separation of the key components in the model, the system coverage rate is high, in recent years due to its reliability problems lead to model system cannot be launched when the accident occurred, not only caused great economic losses, but also lead to serious consequences. The locking mechanism is a key part of separation the electric connector is reliably connected with the separation, is detached from the weak link of electrical connector reliability, according to statistics, involving the separation performance in the separation loss of electrical connector reliability problem in about 66.7%, such as JF2 type electrical connector is detached from input has repeatedly appeared abnormal release of separation electric signal separation. The reason is that I the electric connector is detached from the locking mechanism, separation of imitation of foreign products, dynamic characteristics and the influence mechanism of separation, failure mode and machine Is not clear, but the lack of reliability modeling and corresponding design methods. Therefore, the JF2 is detached from electrical connector lock separation mechanism as the research object, carry out the dynamic analysis of collision considerations, the influence of the separation performance, study the reliability modeling and evaluation method, and the reliability optimization design method, so as to improve the reliability of locking and separating mechanism, has an important significance to ensure the success rate of emission models. In the first chapter, the author introduces research background and significance. Analyzed and summarized the history and current situation of reliability, existence and development of the mechanical reliability problems, detached from electrical connector reliability research status and existing problems, on the basis of this paper presents the research objectives and research content. The second chapter, analysis of dynamic characteristics of compact structure and separation mechanism. The lock locking mechanism based on separation As a principle, will unlock its separation process is divided into a collision, unlock, unlocked at level two and head seat separation in four stages, using Lagrange equation, mechanism dynamics model was established based on Hertz contact collision theory, the reliability analysis for locking the separation mechanism, modeling and assessment and reliability optimization design has established the foundation. The third chapter, lock analysis and experimental simulation. The dynamic tight separation mechanism to establish the parametric dynamic simulation model of locking separation mechanism using ANSYS Maxwell and ADAMS software. The comparison between the simulation and the kinetic theory model results, to validate the theoretical model and simulation model. The motion characteristic curve of the separation process of tight lock the separation mechanism is obtained by experiment and dynamic displacement characteristics of electromagnet high speed image measurement technology, the comparison of simulation data and theoretical data, further verify the theoretical model The correctness of model and simulation. In the fourth chapter, failure analysis of locking separation mechanism is given. Definition of failure locking separation mechanism, determine the failure criteria; with the help of simulation model, analyzes the influence of various factors on the separation performance of the lock unlock separation mechanism using FMEA method; analysis the reliability of locking separation mechanism sure, the main failure mode and weak link; combined with the kinetic model, the quantitative separation mechanism locking failure criterion, reliability modeling, reliability assessment and provide a basis for optimization design. The fifth chapter, locking the separation mechanism. Reliability modeling determines the reliability characteristic parameters and reliability index of the locking separation mechanism; a lock the reliability of structure of tight separation mechanism, the establishment of a collision, two unlock, unlock and head seat separation safety boundary equation; determine the size, geometry material properties, loads and Distribution of electrical performance parameters; proposes a randomized Quasi Monte Carlo reliability calculation method; the locking separation mechanism of reliable separation degree is 99.83%, the reliability index does not reach the requirement of 99.99% for reliability design. In the sixth chapter, the reliability design of tight lock separation mechanism is proposed. The locking mechanism to meet the reliability index of separation conditions next, the minimum size change mechanism for optimization design using randomized Quasi Monte Carlo method criterion; further analysis of the mechanism of random variables on the influence regularity of reliability, determine the electrolytic lock spring, pull rod spring and separating spring wire diameter, diameter and number of active coils parameters as design variable, minimum absolute value as the goal to change the parameters of the rate function, design variables corresponding to the spring winding ratio, strength, anti conditions and geometric relations and circle as deterministic constraints, institutional separation reliability is greater than 99. 99% probabilistic constraints, establishes lock separation mechanism consistency optimization (AAO) reliability design model; in view of the dimension of the model is high, put forward the target cascading (ATC) and quasi random reliability optimization strategy based on Monte Carlo method, so as to realize the locking separation mechanism from reliability optimization design. Finally, the research work this paper is summarized, and the future work is prospected.

【学位授予单位】：浙江理工大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TM503.5

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