[in Japanese]

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In this paper, a new method of synthesis-we call it “Compensation formulas method”-of automatic control systems, is described. According to this method, we can find the most suitable compensating circuit, as to make an automatic control systems to have a pair of desired characteristic roots, by use of a “Compensation limit diagram”. While, the constants of the above circuit can be determined by means of the “Compensation formulas”. Here, the “Compensation limit diagram” is a comparatively simple diagram drawn by straight lines and parts of circles, and the “Compensation formulas are formulas expressed by trigonometric functions”. Also, we may perform parallel compensations as well as series compensations by this method simply and exactly. The contents of this paper, are as follows.(1) The plinciple of this method.(2) Compensation formulas obtained with a lead circuit and a lag circuit.(3) Application of this method to determine the contents of lead-lag circuit.(4) Illustration of compensation limit diagram.(5) Consideration and selection of characteristic roots and compensating circuit.(6) Synthesis of parallel compensation.

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It is considered very important to study transient response before setting up a control system. If the transient response can be estimated beforehand, it will be very convenient for either user and maker. Basing upon the above mentioned reason, this study is purported in the transient response of a control of a single capacity process with dead time. The controller is assumed a perfect proportional one, The differential equation is firstly nondimensionalised, and then treated by the Laplace transformation. To obtain a correct answer, the power series method is used. Using this correct answer, the root-locus method or the control region method can be found to be suited for the estimation of a transient response. In this discussion, the root-locus method is applied, and Fig. 5 to 10 show the results of the method. The charts directly express the transient response in nondimensional form.

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This paper describes the response of a nonlinear closed-loop control system subjected to a periodic excitation. Its free oscillations are of the self-sustained type caused by a nonlinear characteristic of an element of the control circuit, which consists of proportional, measuring means with Coulomb's friction, controlling means with the integral action and two-capacity process with selfregulation. The combination oscillations as well as harmonic oscillations occuring in this system are approached experimentally and theoretically.

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A self-saturable magnetic amplifier which consists of a reacter in series with a rectifier, a pure resistant load and an a-c voltage source is theoretically and graphically analysed with respect to its operation. The characteristics of an amplifier can be illustrated as a function of the B-H curve of its core material.

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