OPERATIONAL RELIABILITY OF TRACTOR ENGINES BASED ON NON-HOMOGENEOUS POISSON PROCESS

AO Changlin^{1, 2}  LI Yijun¹  YAN Xiangbin¹  CHU Fangfang¹

(1. School of Management, Harbin Institute of Technology, Harbin 150001;
2. College of Engineering, Northeast Agricultural University, Harbin 150030)

Abstract: The data of engine failures about tractors operating in field conditions is collected by running engine failure tracting tests. A mathematic model is established using the theory of random process, and non-homogenous process for the engine failure process, a hypothesis test is done with the model, and parameters are estimated with the failure process model as well. The mathematical expression between the intervalic time of engine failures and the failure intensity function is studied, the concepts of failure process improvement and deterioration are defined, and the relation between the failure process improvement and deterioration and the failure intensity function is developed so that failure intensity curves are established for the initial operation of engine, and estimated mean time between engine failures is given. The result of research can be used as references for improvement of reliability and maintainability of tractor engines, and for establishment of maintenance strategy, and as theoretical basis for study on the interrelation between mechanical system failures as well.

Key words: Engine Reliability  Failure intensity  Non-homogeneous  Poisson process

CLC No: TH128 TB114.3

哈尔滨工业大学技术•政策•管理(TPM)研究中心和黑龙江省博士后科研启动基金(04095)资助项目. Received 20061128, received in revised form 20070730