CAJ | 학술논문

混合系统是既有连续变量也有离散事件的复杂的动力学系统，混合系统中的模态转换及参数不确定性可引起残差突变，原因是不同的模态下有不同的元件参与，采用常数阈值或常规自适应阈值往往造成误诊和漏诊。通过搭建混合系统键合图诊断模型，在对参数不确定性进行区间估计的基础上，运用线性分式转换构造模态转换自适应阈值，解决混合系统故障诊断中的误诊和漏诊问题。通过车辆转向系统的故障诊断进行实例分析及检验，实验结果表明所提算法的正确性和可行性，为混合系统故障诊断提供了新的解决方案。
혼합계통시기유련속변량야유리산사건적복잡적동역학계통，혼합계통중적모태전환급삼수불학정성가인기잔차돌변，원인시불동적모태하유불동적원건삼여，채용상수역치혹상규자괄응역치왕왕조성오진화루진。통과탑건혼합계통건합도진단모형，재대삼수불학정성진행구간고계적기출상，운용선성분식전환구조모태전환자괄응역치，해결혼합계통고장진단중적오진화루진문제。통과차량전향계통적고장진단진행실례분석급검험，실험결과표명소제산법적정학성화가행성，위혼합계통고장진단제공료신적해결방안。
A hybrid system is a complex dynamics system that includes both continuous variables and discrete e-vents;mode changes and component uncertainties lead to different compositions of component uncertainties and re-sidual fluctuations;the employment of constant threshold will cause false alarm or missed detection on hybrid fault detection system. In this paper, we, taking component parameter uncertainties and mode change into consideration, utilize Global Analytical Redundancy Relations ( GARR) and LFT Bond Graph model to formulate mode-dependent thresholds to address problems of false alarm or missed detection in FDI of a hybrid system. An online experiment of vehicle steering system is researched in detail to show the concepts of the proposed algorithm, and experimental re-sults of different faults suggest the feasibility of mode-dependent threshold in FDI of a hybrid system.