The frequency characteristic of electrohydraulic servo system for coilers wrapper rolls is measured with the use of sine wave method. Then,the open loop transfer function of the system is estimated by means of Levy method,and the parameters associated with frequency characteristic of the system are presented.

How to distinguish the stability of closed loop system is analyzed and expounded when pole zero cancellation takes place in the open loop transfer function,and methods of distinguishing the stability of closed loop system under various situations of open loop pole zero cancellation are provided.

In the papers, we first introduce the concept of SISO loop shaping design. It utilizes small gain theorem to achieve robust stability of the system and develops the relationship of open loop transfer function (L) to robust performance and to robust stability of the system. These concepts can be extended to H∞loop shaping method.

The characteristics and time sequence of HCTL-1100 arestudied in detail ,the interface circuit have been designed and evaluated with the concept of gain affluenceand phase angle affluence of open loop transfer function.

Discussion is made, based on the application of average state space analysis, and on establishing an open loop transfer function which is analyzed in order the optimize the equalized network with meeting the demands.

The Bode diagrams of system sensitivity function and system open loop transfer function were utilized to verify the stability and antidisturbance ability of the designed velocity controller respectively.

This DDE is shown to be consistent with the measured open loop transfer function and hence physiological insight can be obtained into the gain of the reflex and its properties.

We chose to identify the open loop transfer function indirectly in this case and give this to students in order for them to complete their designs.

We first introduce a modified relay feedback test to identify two points on the Nyquist curve of the open loop transfer function.

Using either injected signals or pilot inputs, the system's open-loop transfer function is deduced using spectral analysis techniques.

Using a discrete-time delay cell, the PLL architecture creates a zero in the open-loop transfer function.

The open-loop transfer function of the typical 4th-order type system is a mathematical model of the unity-feedback system commonly used in engineering field. An analysis is made to show the correlation between the transient performance of the system in time-domain and parameters of the model in frequency-domain. Besides, an analytical method for calculating the parameters of the ideal model and a discussion on the synthesis method of the inherent parame-ters of the original system are...

The open-loop transfer function of the typical 4th-order type system is a mathematical model of the unity-feedback system commonly used in engineering field. An analysis is made to show the correlation between the transient performance of the system in time-domain and parameters of the model in frequency-domain. Besides, an analytical method for calculating the parameters of the ideal model and a discussion on the synthesis method of the inherent parame-ters of the original system are presented.

In this paper, the relationships of positivity and optimality for linear time - invariant systems are considered. First, the relationship of positivity and optimality for single-input single - output linear time - invariant systems is discussed by the frequency domain method. Next, for multivariable linear time-invariant systems, this relationship is discussed by the time domain method. The main results are as follows: The closed loop system formed by stable optimal state feedback is positive, its transfer function...

In this paper, the relationships of positivity and optimality for linear time - invariant systems are considered. First, the relationship of positivity and optimality for single-input single - output linear time - invariant systems is discussed by the frequency domain method. Next, for multivariable linear time-invariant systems, this relationship is discussed by the time domain method. The main results are as follows: The closed loop system formed by stable optimal state feedback is positive, its transfer function matrix is positive real. Conversely, if the open loop transfer function matrix is positive real, then the closed loop system obtained by negative unity output feedback is stable and optimal. Finally, from the discussion of the relationships of positivity and optimality we showed that the stable gain margin of optimal control systems is infinite.

None of the root locus of G(S)H(S)=K(S+a)/(S+b) open-loop transfer function system dealt with in numerous documents take into consideration whether there are separation points and junction points.The author does not think it comprehensive.Through the analysis of some examples, the author concludes that the above system has the following three states; (1) There may be both separation points and junction points; (2) There are not only separation points with zero pole points but also junction...

None of the root locus of G(S)H(S)=K(S+a)/(S+b) open-loop transfer function system dealt with in numerous documents take into consideration whether there are separation points and junction points.The author does not think it comprehensive.Through the analysis of some examples, the author concludes that the above system has the following three states; (1) There may be both separation points and junction points; (2) There are not only separation points with zero pole points but also junction points; (3) There is only one separation point with zero pole points.From the above exmples, this paper derives an equation and a general expression of the root locus of the system.