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液晶電視的可靠性試驗研究
液晶電視的可靠性試驗研究
摘 要: 本文以液晶電視產品為研究對象，在對市場同類產品失效分析的基礎上對公司開發的產品進行可靠性試驗方法的研究，旨在獲得產品可靠性指標的同時，建立一套系統的，合理的適合公司開發的液晶電視產品的加速壽命試驗方案，從而更好地對所開發的產品進行質量控制。介紹了可靠性研究的發展歷史和國內外可靠性發展現狀，可靠性研究的主要內容以及家用電器可靠性的發展。利用工業工程方法，通過對市場上液晶電視產品的失效情況的統計分析，結合公司產品的可靠性現狀，建立液晶電視可靠性故障樹，為其可靠性試驗設計提供依據。
為了驗證所設計的加速試驗方案的可行性和合理性，試驗分兩組同時展開。
一組是在正常應力下進行的壽命試驗，另一組是在加速應力下進行的壽命試驗，前者是為驗證后者而進行的試驗。正常應力試驗和加速壽命試驗除了試驗應力不同之外，其余*一樣：樣品從同一批次產品中抽取，試驗步驟和失效判據等都相同，因而，理論上每組試驗樣品的壽命分布類型相同。
加速壽命試驗采用溫度加速因子，同時利用定數截尾結束試驗。采用阿倫尼斯加速統計模型，首先假設產品服從指數或威布爾壽命分布,然后根據試驗數據對產品進行指數分布檢驗和威布爾分布檢驗。
試驗數據分別采用點估計和區間估計的方法進行處理。通過對加速壽命試驗數據的處理，外推其正常應力下的可靠性壽命值，然后再將其和正常應力下的試驗數據進行比對，從而驗證加速試驗方案是否可行。
關鍵詞：可靠性，液晶電視，試驗研究，加速壽命試驗
RESEARCH ON RELIABILITY TESTING OF
LCD TV
ABSTRACT
This thesis takes the LCD TV products as the object of study. Based on the failure analysis of the kindred products in the market, the thesis will carry on the research of the reliability test for the products which the company currently developed. The aim for the research is to set up a reasonable, systemic solution which can accelerate the life-time testing of LCD TV products. At the same time, we can get the reliability indicators. That will better strengthen the quality control for the developed products. The thesis also introduce the history, present situation, main content & development of the reliability research for those home electric appliance. kekaoxing.com. By using the industry & engineering method, statistic analysis for those failure LCD
TV products and combine the reliability situation for the company’s products, this thesis set up a fault tree for the LCD TV. That will provide the foundation of the reliability testing.
So as to verify the feasibility & rationality of the accelerating test, the test will be proceeded by two groups. One is the life-time testing under the normal stress while the other one is the life-time testing under the accelerated
stress situation. The former one is performed to verify the latter one. The normal stress test is the same as the accelerated life-time test except the stress test. It is to say the samples will be taken from the same batch products. And the test procedure & the criterion of failure is the same as well. So, theoretically speaking, the life-time distribution pattern for each sample should be same.
The accelerated life-time test will be finished by using the temperature accelerated factor and definite truncation. Adopting the Arlen Ness accelerating statistics pattern, firstly assume the products obey the indicator or Weibull life distribution, then start the indicator distribution test and Weibull distribution test by the test data.
The test data is processed by the methods of point estimation & interval estimation. By the process of the accelerating life-time test data, we can get the reliability life-time factor under normal stress. Then compare it with the test data under normal stress, that can verify the feasibility of the accelerated
testing project.
KEY WORDS: reliability, LCD TV, test research, accelerated life-time test