However , the control performance of the pmsm drive is still influenced by uncertainties , which usually features parameter variations , external load disturbances , unmodelled and nonlinear dynamics . to achieve high - performance pmsm drive , which has great ability of adaptation and better performance against disturbances , advanced control schemes have to be developed to deal with these uncertainties 然而,由于永磁同步电机驱动系统受电机参数变化、外部负载扰动、对象未建模和非线性动态等不确定性的影响,要获得高性能的永磁同步电机驱动系统,必须研究先进的控制策略以解决这些不确定性的影响,使系统具有较强的自适应能力和抗干扰能力。
Thirdly , the object - oriented way of lre knowledge representation for causality , system structure , and models is presented , and an organization model of lre diagnosis knowledge for integration of deep and shallow knowledge based on the lre component structure and in the form of node knowledge base is given . and finally , the lre intelligent fault diagnosis theory and strategy , which utilize synthetically different kinds of diagnosis knowledge and multiple reasoning methods , such as rule - based , model - based , fuzzy - knowledge - based , and dynamic - knowledge - based reasoning methods , are discussed and developed . the results verified by the test - firing data and the simulated fault samples show that , the theory and methods proposed give a theoretical basis for the design and realization of practical lre fault diagnosis and health monitoring systems , and can be available for reference in the development of health monitori ng technique for reusable space transportation systems in the future 主要研究内容包括：系统阐述了发动机诊断知识的概念、类别和相互关系；研究发展了定性和定量、浅层和深层、模糊和动态等多种诊断知识的图形和模型获取方式；建立了因果、结构和模型等不同层次和类别的诊断知识的面向对象表示方法，以及以发动机的部件结构为基础，以结点知识库为组织形式，深浅知识相结合的诊断知识集成组织模型；研究发展了综合多层次和多类别诊断知识，集成规则推理、模型推理、模糊推理和动态知识推理的发动机智能故障诊断理论和策略，并结合实际热试车数据和故障仿真实例对所发展的理论、方法与策略进行了验证。
This paper offers a review of the study on the issues with regard to the varied understandings of " universal value " , the proof of its existence , the views on its forms of existence , and the latest trends in its study , in the hope of providing some reference for the follow - up studies 本文从对普世价值的不同理解、对普世价值是否存在的证明、对普世价值存在形式的看法、对普世价值研究的新动态等四个角度对当前关于普世价值的研究进行了述评，以期为后续研究提供参考。
