本文關鍵詞：電連接器鎖緊分離機構可靠性設計方法的研究　出處：《浙江理工大學》2017年博士論文　論文類型：學位論文

  更多相關文章： 動力學分析 仿真分析 可靠性建模 隨機擬蒙特卡洛法 可靠性設計

【摘要】：分離脫落電連接器作為型號系統(tǒng)實現(xiàn)電信號連接與分離的關鍵元器件,在型號系統(tǒng)的覆蓋率較高,近幾年由于其可靠性問題導致型號系統(tǒng)不能按時發(fā)射的事故時有發(fā)生,不僅造成重大的經(jīng)濟損失,還導致嚴重的后果。鎖緊分離機構是實現(xiàn)電連接器可靠連接與分離的關鍵部件,也是分離脫落電連接器可靠性的薄弱環(huán)節(jié),據(jù)統(tǒng)計,在分離脫落電連接器可靠性問題中涉及分離性能的約占66.7%,如JF2型分離脫落電連接器曾多次出現(xiàn)輸入電分離信號后不能正常解鎖分離。究其原因,在于我國分離脫落電連接器鎖緊分離機構系仿制國外產(chǎn)品,機構分離的動力學特性及其影響規(guī)律、失效模式及機理不清,同時缺少相應的可靠性建模與設計方法。因此,本文以JF2分離脫落電連接器的鎖緊分離機構為研究對象,開展考慮碰撞的動力學特性分析,研究分離性能的影響規(guī)律,研究其可靠性建模與評估方法,以及可靠性優(yōu)化設計方法,從而提高鎖緊分離機構的可靠性,對確保型號發(fā)射的成功率有著重要的意義。第一章,闡述了本文的研究背景和意義。分析總結(jié)了可靠性的發(fā)展歷史及現(xiàn)狀、機械可靠性的發(fā)展及存在問題、分離脫落電連接器的可靠性研究現(xiàn)狀與存在的問題,在此基礎上提出了本文的研究目標和研究內(nèi)容。第二章,鎖緊分離機構動力學特性分析。基于鎖緊分離機構的結(jié)構及工作原理,將其解鎖分離過程分為一級解鎖、碰撞、二級解鎖及頭座分離四個階段,利用拉格朗日方程、Hertz接觸等理論建立了考慮碰撞的機構動力學理論模型,為鎖緊分離機構的可靠性分析、建模與評估以及可靠性優(yōu)化設計奠定了基礎。第三章,鎖緊分離機構動力學仿真分析與實驗驗證。利用ANSYS Maxwell和ADAMS軟件建立了鎖緊分離機構的參數(shù)化動力學仿真模型,對比仿真與動力學理論模型求解結(jié)果,初步驗證了理論模型與仿真模型的正確性。通過電磁鐵動態(tài)位移特性實驗及高速圖像測量技術獲取了鎖緊分離機構分離過程的運動特性曲線,對比仿真數(shù)據(jù)與理論數(shù)據(jù),進一步驗證了理論模型與仿真模型的正確性。第四章,鎖緊分離機構失效分析。給出了鎖緊分離機構失效的定義,確定了失效判定準則;借助仿真模型,分析了各種因素對鎖緊分離機構解鎖分離性能的影響;應用FMEA方法對鎖緊分離機構進行了可靠性分析,確定了其主要失效模式及薄弱環(huán)節(jié);結(jié)合動力學模型,量化了鎖緊分離機構失效判據(jù),為可靠性建模、評估及可靠性優(yōu)化設計提供了依據(jù)。第五章,鎖緊分離機構可靠性建模。確定了鎖緊分離機構的可靠性特征參量及可靠性指標;建立了鎖緊分離機構可靠性結(jié)構層次,建立一級解鎖、碰撞、二級解鎖及頭座分離安全邊界方程;確定了機構幾何尺寸、材料性能、載荷及電性能參數(shù)的分布規(guī)律;提出了隨機擬蒙特卡洛可靠性計算方法;得到了鎖緊分離機構分離可靠度為99.83%,未到達可靠性指標99.99%的要求,需進行可靠性設計。第六章,鎖緊分離機構可靠性設計。提出了鎖緊分離機構在滿足可靠度指標的條件下,使機構基本尺寸變化最小為優(yōu)化設計準則;利用隨機擬蒙特卡洛法進一步分析了機構隨機變量對可靠度的影響規(guī)律,確定了電解鎖彈簧、拉桿彈簧及分離彈簧的絲徑、中徑及有效圈數(shù)等參數(shù)為設計變量,以各參數(shù)的變化率絕對值最小為目標函數(shù),以設計變量對應彈簧的旋繞比、強度、防并圈條件及幾何關系等為確定性約束,機構分離可靠度大于99.99%為概率約束,建立了鎖緊分離機構一致性優(yōu)化(AAO)可靠性設計模型;鑒于模型維數(shù)較高,提出了目標級聯(lián)法(ATC)和基于隨機擬蒙特卡洛法的可靠性優(yōu)化策略,從而實現(xiàn)了對鎖緊分離機構分離可靠性的優(yōu)化設計。最后,對全文的研究工作進行了總結(jié),并對下一步工作進行了展望。
[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.

【學位授予單位】：浙江理工大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TM503.5

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