一般工程系統的設計問題，都可視為供給(Supply)與需求(Demand)的問題。系統或組件是否能滿足設計需求，取決於設計的強度(供給條件)是否承受所遭受的最大作用力(需求條件)。然而，通常有許多影響設計或使用條件的因素是無法確定的。因此有必要考慮設計機率的特性，系統工程可靠度設計便而發展。
　　　大部分的機械系統，在使用的時間或操作過程中，都會受到腐蝕、疲勞、潛變等因素，而造成系統組件慢慢退化。當應力大於強度的機率變大，失效率變會增大，可靠度退化的速度就會變快。因此，系統組件強度和可靠度退化快慢有密切的關係存在。利用本實驗室所建立的動態可靠度模式，進一步來分析預防保養對動態可靠度的影響。
　　 系統組件在使用期間的性能退化可藉由不同的動作來改善。其中對系統進行預防維護作業是最有效的方法。在維護期間，往往必須考慮到系統效益，使系統在最小的成本中發揮最大的效益。因此設計並制定一套良好的維護策略，不僅可以有效降低失效率而避免失效的發生，並且可提高系統的效益。

General engineering system design questions are all visible for Supply and Demand. To fill the design requirements of system or element is according to whether the strength of design enduring the maximum effort .However , usually has many influences designs or the exploitation conditions factor is unable to determine. Therefore the consideration design probability characteristics are allowed and the reliability engineering of system is developed.
Most mechanical systems are corroded, fatigued, creep in using process and components strength degenerated slowly. The hazard rate increased and the reliability degenerated quickly when the stress is bigger than the strength. Therefore, the components strength and reliability degeneration has close relationship. The dynamic reliability model is established in lab. to analyze the influence of preventive maintenance to dynamic reliability model.
In order to reduce unexpected failure occurrence and extend running life of a system, taking preventive maintenance (PM) has been extensively used in many fields. During maintenance, taking care of system profit, making the most benefit of system in minimal cost. Therefore design and formulates a good maintenance strategies and avoid expiration and may enhance the benefit of system.

【1】 Wang K. S. , Wan E. H. and Yang W. G. , “ A Preliminary investigation of New Mechanical Product Development Based on Reliability Theory,” Reliability Engineering and Safety , Vol. 40, 1993, pp.187-194
【2】 Kolarik W. J. , Creating Quality concepts systems strategies and Tools , McGraw Hill , N. Y.,1995
【3】 Ramakumar R, Engineering Reliability Fundamentals and Applications, PTR Prentice Hall , New Jersey , 1993
【4】 Kapur,K.C & Lamberson,L.R.,Reliability in Engineering Design Chap 1,5&8, John Wiley & Sons,N.Y.(1977)
【5】 Elmer, E.Lewis Introduction to Reliability Engineering, John Wiley & Sons, N.Y.(1986)
【6】 Shooman, M.L. Probabilistic Reliability:An Engineering Approach,Mc Graw-Hill,Inc.,N.Y.(1968)
【7】 Rao S. S., Reliability -Based Design, McGraw-Hill, N.Y.1993.
【8】 Bompas-Smith, J. H., ”The Determination of Distributions that Describe the Failure of Mechanical Components,” Annals of Assurance Science,N.Y.(1969)
【9】 Malik, M.A.K., “Reliable Preventive Maintenance Scheduling “ AIIE Transactions , Vol 11, 1979 , pp. 221-228
【10】 Lie , C. H., and Chun Y. H. , “An Algorithm for Preventive Maintenance Policy “ IEEE Transactions on Reliability , Vol , R-35 , 1986, pp. 71~75
【11】 Nakagawa,T., “Optimum Policies when Preventive Maintenance is Imperfect ,” IEEE Transactions on Reliability , Vol , R-28, 1979,pp.331~332
【12】 Gupta, A. ,” Reduced Tree Search for Optimal Preventive Maintenance of Generation Facilities ,” IEEE Transactions on Reliability , Vol , R-30, 1981,pp.476~477
【13】 Chan, P. K. W. and Downs, T., “ Two Criteria for Preventive Maintenance “IEEE Transactions on Reliability , Vol , R-27, 1978,pp.272~273
【14】 Jayabalan, V., and Chaudhuri, D. , “ Cost Optimization of Maintenance Scheduling for a System with Assured Reliability ,” IEEE Transactions on Reliability , Vol .41, 1992 ,pp.21~25
【15】 許金竹，”預防更換對機械系統動態可靠度影響之研究”，國立中央大學機械工程研究所，碩士論文，1993。
【16】 張維修，”基因演算法在系統組件更換策略之研究”，國立中央大學機械工程研究所，碩士論文，1996。
【17】 Kapur, K. C. & Lamberson, L. R., Reliability in Engineering Design.,John Wiley & Sons, N.Y., 1977.
【18】 蔡林昌，”故障樹分析法應用於彈性製造系統組件維護策略之 研究”，國立中央大學機械工程研究所，碩士論文，1997。
【19】 黃舉錐，”非等強度分負荷系統負載調整方案之研究”，國立中央大學機械工程研究所，博士論文，1998。
【20】 蔡有藤，”系統預防維護作業之研究”，國立中央大學機械工程研究所，博士論文，1999。
【21】 許芳勳，”動態可靠度模型之探討及其應用”，國立中央大學機械工程研究所，博士論文，2001。
【22】 Wang K. S., S. T. Chang & Y. C. Shen, “Dynamic Reliability Models for Fatigue Crack Growth Problem,” Engineering Fracture Mechanics, Vol.54, No.4, pp.543-556, 1996.
【23】 Wang K. S., Y. C. Shen and J. J. Huang, "Loading Adjustment for Fatigue Problem Based on Reliability Consideration", International Journal of Fatigue, Vol.19, No.10, pp.693-702, 1997.
【24】 張豪麟，”系統動態可靠度與其失效率關係的探討”，國立中央大學機械工程研究所，碩士論文，1999。
【25】 Halpin, J. C., Jerina, K. L., and Johnson, T. A., “In Analysis of Test Method for High Modulus Fibers and Composites. ASTM STP 521, American Society for Testing and Material, pp.5-64,1973
【26】 Sendeckyj, G. P., “ Fitting Models to Composite Materials Fatigue Data,” Test Methods Design Allowables for Fibrous Composites, ASTM STP 734,
C. C. Chamis,Ed., American Society for Testing and Material, pp. 245-260,
1981.
【27】Spotts, M,F., “Design of Machine Elements :, 6-th edition , Prentice-Hall,
Englewood Cliffs, N.J.,1992.
【28】梁柏任，”材料強度退化與累積損傷之探討”，國立中央大學機械工程研究
所，碩士論文，2000。