Any interactive computer-aideddesign technique for multivariable feedback systems is critically dependent on the deployment of an appropriate set of indicators with Which to assess stability, performance and robustne...
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Any interactive computer-aideddesign technique for multivariable feedback systems is critically dependent on the deployment of an appropriate set of indicators with Which to assess stability, performance and robustness. Appropriate generalizations of the classical feedback concepts of gain and phase are developed for this purpose. The way in which these can be used for analysis and design purposes is briefly outlined.
The paper proposes introduction of formalism in controlsystem development in order to reach user's mental model. The control interface consists of an external user dialogue and an internal dialogue (explicit) and...
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The paper proposes introduction of formalism in controlsystem development in order to reach user's mental model. The control interface consists of an external user dialogue and an internal dialogue (explicit) and an external plant dialogue (implicit). The concept of interface independence is supported employing macrocommunication by an application semantics image. Introduced formal method is established on sets, sets of states and predicates. The formal method determines what has to be said about the application semantics image and the external user dialogue. The method is addressed firstly to an enduser and an interface developer. It is a solid basis for development a specification language for interface customisation during system prototyping including all system safety properties.
In this paper we describe several recent applications of symbolic computation to controlsystemdesign based on MACSYMA. These include routines to calculate the transfer function of a controlsystem in block diagram r...
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In this paper we describe several recent applications of symbolic computation to controlsystemdesign based on MACSYMA. These include routines to calculate the transfer function of a controlsystem in block diagram representation and to compute and simplify state space realizations of multivariable controlsystems. The programs provide a quick way to formulate design problem and automate the calculation in the initial stage of a controlsystemdesign process. An example on the application of these routines in the setting up of generalized plant state space realization for use in H ∞ /H 2 optimial control is provided
This paper reports on the benefits to programmers of creating a library of abstract data types for linear algebra and computer-aidedcontrolsystems analysis and design. Such a library should be easier and safer to us...
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This paper reports on the benefits to programmers of creating a library of abstract data types for linear algebra and computer-aidedcontrolsystems analysis and design. Such a library should be easier and safer to use than the current state-of-the-art which is based on libraries of compiled FORTRAN functions. The structure of the some abstract data types for controlsystems is indicated and an example of their use in linear systems modelling is given.
During reentry flight regime of a typical Reusable Launch Vehicle (RLV), there is rise in dynamic pressure which increases the coupling between yaw (directional) and roll (lateral) dynamics. High uncertainty on aerody...
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During reentry flight regime of a typical Reusable Launch Vehicle (RLV), there is rise in dynamic pressure which increases the coupling between yaw (directional) and roll (lateral) dynamics. High uncertainty on aerodynamic coefficients due to less number of wind tunnel tests, makes it essential to use robust controldesign techniques to design a controller for any new aerodynamic configuration of RLV. controlsystemdesign during critical flight regime of RLV using 'H-infinity Mixed Sensitivity' approach is addressed in this paper. The main bottle neck in using H-infinity approach is the lack of guidelines in finding weighting functions to achieve required time and frequency domain specifications. It is seen that the solution process becomes easier if the coupling and damping requirements are first addressed by designing the aileron to rudder interconnect (ARI) gain and roll-yaw rate gains using classical approach and then applying the H-infinity procedure on the plant model, updated with the designed ARI and rate gains, to shape the sensitivity and complementary sensitivity functions. This is the main contribution of our paper. This approach has resulted in highly robust controller against plant parameter perturbations. The yaw-roll coupling, which is the main problem, could also be eliminated to a greater extent.
A novel computer-aided technique for magnitude-phase loop transmission shaping in Quantitative Feedback Theory is described. The designer, who needs to have only qualitative knowledge of the Nyquist plots of six stand...
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A novel computer-aided technique for magnitude-phase loop transmission shaping in Quantitative Feedback Theory is described. The designer, who needs to have only qualitative knowledge of the Nyquist plots of six standard low-order compensators, can in principle easily design a compensator to any desired degree of accuracy, while being aware at all times of the tradeoff between the accuracy achieved and the order of compensator required to achieve it.
This paper will describe the development of a prototype software toolbox that can analyze and process a Simulink block diagram model in order to produce a VHDL representation of the model. The derived VHDL model will ...
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This paper will describe the development of a prototype software toolbox that can analyze and process a Simulink block diagram model in order to produce a VHDL representation of the model. The derived VHDL model will consist of a combination of behavioural, RTL and structural definitions mapped directly from the Simulink model. This approach may enable a user to develop and simulate a digital control algorithm using Mat/ab and once complete, convert this to VHDL code. This would then be synthesized into digital logic hardware for implementation on devices such as FPGAs (Field Programmable Gate Arrays) and ASICs (Application Specific Integrated Circuits).
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