摘要:

Periodic cycles of bounded amplitude may exist in a closed-loop system consisting of an integral pulse frequency modulator and a linear element. This paper develops theoretically the conditions for the existence of these cycles, explicit formulae for their periods, and a criterion for their stability.

ISSN:0020-7179    

DOI:10.1080/00207176908905725

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

This paper deals with the problem of finding the 2Ncoefficients of a linear combination ofNexponentials which minimizes its mean square error from a given functionf(t). The real difficulty lies in the determination of the optimal exponents.

ISSN:0020-7179    

DOI:10.1080/00207176908905726

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

In this, the second of three papers related to the stability properties of discrete-continuous control systems with signal dependent sampling constraints, basic stability concepts are critically re-examined and some now ones presented. In particular the concept of defieiency has been extended to the definition of the stability properties of physical systems and the problem of practical stability considered.

ISSN:0020-7179    

DOI:10.1080/00207176908905727

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A triangular waveform generator that operates over a wide range of frequency is described. A complementary pair of transistors are employed to charge and discharge a capacitor alternately in a linear manner in conjunction with a comparator and a level transforming circuit to generate symmetrical waveforms. The circuit configuration provides excellent amplitude stability.

ISSN:0020-7179    

DOI:10.1080/00207176908905728

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

This paper is an extension of a previous one (Sancho 1968), and derives the differential equations for the oments of a system with generalized Poisson or Gaussian.white noise parameters. The rate of change of the expected value of an arbitrary function of the state variables is found, which is later specialized to the system moments.

ISSN:0020-7179    

DOI:10.1080/00207176908905729

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

In this paper a method for solving an optimal control problem with multiple constraints on the controlling function has been developed. The method is extended to problems with constraints on both the control function and a state variable. Finally the method gives rise to two auxiliary problems : (i) minimization of an integral over functions by calculus of variations and (ii) solution of a non-linear programming problem.

ISSN:0020-7179    

DOI:10.1080/00207176908905730

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Using the parameter–plane method, the stability of linear stationary systems with time delay is considered. As a result, feedback systems with variable time delay and loop gain may be investigated in a straightforward manner. An example is included to illustrate the method.

ISSN:0020-7179    

DOI:10.1080/00207176908905731

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The performance index sensitivity is analysed for the general optimal control problem with initial and final target manifolds. The sensitivity is compared for two arbitrary controllers A and B which are optimal for a nominal parameter value. The method of analysis provides additional insight into the relationship between trajectory sensitivity and the sensitivity of the performance functional. An expression relating the performance index sensitivities for two designs is formulated in terms of the trajectory sensitivities at the initial and final manifolds.

ISSN:0020-7179    

DOI:10.1080/00207176908905732

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

ISSN:0020-7179    

DOI:10.1080/00207176908905733

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor