本文選題：驅(qū)動(dòng)系統(tǒng) + 可靠性預(yù)計(jì)�。� 參考：《山東大學(xué)》2017年碩士論文

【摘要】：現(xiàn)在電梯、扶梯廣泛應(yīng)用于住宅、商業(yè)地產(chǎn)等領(lǐng)域,近期卻不時(shí)出現(xiàn)被曝出電梯關(guān)人、下墜、急停等各種故障和事故,給電梯應(yīng)用的安全性蒙上了一層陰影。由于電梯是涉及民生和公共安全的產(chǎn)業(yè),近幾年政府機(jī)構(gòu)、行業(yè)委員會(huì)、企業(yè)單位等對(duì)于非常重視電梯的安全性;另外變頻驅(qū)動(dòng)系統(tǒng)作為電梯系統(tǒng)中核心部件,其對(duì)電梯穩(wěn)定工作起著關(guān)鍵作用。本文在這樣的背景下,參考國(guó)家軍用產(chǎn)品、航空航天和汽車等領(lǐng)域的對(duì)于產(chǎn)品進(jìn)行可靠性預(yù)計(jì)的成熟做法,引入可靠性理念。本課題以電梯專用變頻驅(qū)動(dòng)系統(tǒng)為研究對(duì)象,該變頻驅(qū)動(dòng)系統(tǒng)通常分為五大子系統(tǒng):主控板、驅(qū)動(dòng)板、儲(chǔ)能單元、速度及位置信號(hào)采集電路和1O輸入/輸出接口電路等組成。對(duì)系統(tǒng)進(jìn)行可靠性研究工作分四步驟:第一步,了解變頻系統(tǒng)上用的關(guān)鍵元器件的可靠性基礎(chǔ)理論和電子類元件的可靠性預(yù)計(jì)參數(shù)定義以及電子類元件的可靠性標(biāo)準(zhǔn)。第二步,根據(jù)電梯專用驅(qū)動(dòng)系統(tǒng)的驅(qū)動(dòng)系統(tǒng)所要達(dá)到的各項(xiàng)指標(biāo),計(jì)算驅(qū)動(dòng)系統(tǒng)的相關(guān)參數(shù),搭建驅(qū)動(dòng)系統(tǒng)平臺(tái)設(shè)計(jì)和各子系統(tǒng)電路平臺(tái)。第三步,在驅(qū)動(dòng)系統(tǒng)平臺(tái)的設(shè)計(jì)中引入可靠性理念,借鑒航空航天和軍用品的電子設(shè)備可靠性預(yù)計(jì)標(biāo)準(zhǔn),參考軍標(biāo)GJB/Z 299B-2006和美軍標(biāo)MIL-HDBK 217兩份可靠性預(yù)計(jì)標(biāo)準(zhǔn)中對(duì)MCU芯片、MOS管、三極管、電阻、電容等電子類元器件的可靠性失效建模,根據(jù)驅(qū)動(dòng)系統(tǒng)在電梯實(shí)際工況中的現(xiàn)場(chǎng)環(huán)境應(yīng)力、選用的元器件質(zhì)量系數(shù)、元器件結(jié)構(gòu)系數(shù)和電路工作應(yīng)力等相關(guān)參數(shù)預(yù)估出產(chǎn)品的失效率。再以串聯(lián)模型進(jìn)行計(jì)算,各元器件失效率的累加可以得到系統(tǒng)總失效率,同時(shí)也得到產(chǎn)品的MTBF(Mean Time Between Failures)平均無(wú)故障時(shí)間。第四步,再借助國(guó)內(nèi)外廣泛認(rèn)可的可靠性分析手段之一FMEA(Failure Mode and Effect Analysis)潛在失效及后果分析來(lái)確定驅(qū)動(dòng)系統(tǒng)的潛在失效模式及失效后果,提出相關(guān)預(yù)防或者解決措施來(lái)降低潛在失效發(fā)生機(jī)率的措施,提高驅(qū)動(dòng)系統(tǒng)產(chǎn)品的可靠性。通過(guò)本文的研究可以發(fā)現(xiàn),可靠性工作是個(gè)繁瑣且持續(xù)性地工作,非一朝一夕就能完成。它需要設(shè)計(jì)者和維護(hù)者一起持續(xù)維護(hù)更新。可靠性預(yù)計(jì)和DFMEA(Design Failure Mode and Effect Analysis)設(shè)計(jì)潛在失效及后果分析工具可以在產(chǎn)品設(shè)計(jì)階段的為其質(zhì)量提供保駕護(hù)航的作用。
[Abstract]:Now elevators, escalators are widely used in residential, commercial real estate and other fields, but from time to time has been exposed from time to close the elevator, fall, stop and other failures and accidents, the elevator application of a layer of security cast a shadow. As elevators are industries that involve people's livelihood and public safety, in recent years government agencies, trade committees, business units and so on have attached great importance to the safety of elevators; in addition, the frequency conversion drive system is the core component of elevator systems. It plays a key role in elevator stability. In this context, this paper introduces the concept of reliability by referring to the mature methods of reliability prediction in the fields of military products, aerospace and automobile. In this paper, the special frequency conversion drive system for elevator is studied. The frequency conversion drive system is usually divided into five subsystems: main control board, drive board, energy storage unit, speed and position signal acquisition circuit and 1O input / output interface circuit. The research on the reliability of the system is divided into four steps: the first step is to understand the basic theory of reliability of the key components used in the frequency conversion system, the definition of the reliability prediction parameters of the electronic components and the reliability standard of the electronic components. The second step, according to the driving system of elevator special drive system to achieve each index, calculate the relevant parameters of the drive system, build the driving system platform design and each subsystem circuit platform. In the third step, the reliability concept is introduced into the design of the drive system platform, and the reliability prediction standard of aerospace and military electronic equipment is used for reference. The MCU chip MOS tube is used for reference in the GJB / Z299B-2006 and MIL-HDBK217 reliability prediction standards of the military standard GJB / Z299B-2006 and the US military standard MIL-HDBK217, respectively. The reliability failure model of electronic components such as transistor, resistor, capacitance and so on. According to the field environmental stress of driving system in the actual working condition of elevator, the mass coefficient of selected components, The failure rate of the product is estimated by the related parameters such as the structure coefficient of components and the working stress of the circuit. Then the series model is used to calculate the total failure rate of the system, and the MTBFU mean time between failure time (MTBFU) of the product can be obtained by the accumulation of the failure rate of each component. The fourth step is to determine the potential failure mode and failure consequence of driving system by means of FMEA / failure Mode and effect Analysis, which is one of the widely accepted reliability analysis methods at home and abroad. Measures to reduce the probability of potential failure are proposed to improve the reliability of driving system products. Through the research of this paper, we can find that reliability work is a tedious and continuous work, which can not be completed overnight. It requires designers and maintainers to maintain updates together. Reliability prediction and DFMEA Design failure Mode and effect Analysis (DFMEA) design potential failure and consequence analysis tools can be used to protect the quality of a product during the design phase.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU857

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