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Human Factors/Ergonomics 人因工程:1 JULY 16, 2019  /  ANYTHINGAVIVI TO LEARN AS A CHINESE -ENGLISH-INDONESIAN TRANSLATOR /  EDIT “ Ergonomics  : the understanding of interactions among humans and other elements of a system, and the profession that applies theory, principles, data and methods to design to  optimize human well-being and overall system performance .” 把-  人的工作优化问题 –  作为追求的过程中融合了 因任何工作&行为离不开 生/心理/医学/卫生学基础知识 等 -的活动.. |注意客观性坚持实事求是&系统性加以研究/认识  Pay attention to objectivity, insist on seeking truth from facts &systematically study/recognize | 研究目的：设计/改进 人-机-环境三者相互有关的系统 Research purposes: design / improvement of the human-machine-environment the three related systems ______________________________________________________________________________ is concerned with: the “fit” between the user, equipment, and environment【”fitting a job to a person”】 使得系统有较高效率/效益，保证安全（减少事故）·健康（创造有利于人体健康/环境因素）·舒适（作业者有满意感）。 to increase productivity, enhance safety/ r

2 Types: +  Positive   /  -    Negative   Feedback Positive Feedback The positive feedback adds the reference input,  R ( s ) R ( s )  and feedback output. The following figure shows the block diagram of  positive feedback control system . The concept of transfer function will be discussed in later chapters. For the time being, consider the transfer function of positive feedback control system is, T = G 1 − G H ;  T = G 1 − G H Where, T  is the transfer function or overall gain of positive feedback control system. G  is the open loop gain, which is function of frequency. H  is the gain of feedback path, which is function of frequency. Negative Feedback Negative feedback reduces the error between the reference input,  R ( s ) R ( s )  and system output. The following figure shows the block diagram of the negative feedback control system . Transfer function of negative feedback control system is, T = G 1 + G H ; T = G 1 + GH Where, T  is the transfe