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Engineering for the development, application, and recycling of products is recently supported by fully integrated model of product. Prototyping is moving to virtual by the application of sophisticated product models for complex simulations. Simulations rely upon knowledge representing experience, expertise and intelligence of engineers in knowledge wares. Increasing proportion of this knowledge is...
Definition of product in model space includes contextual decisions and relies upon background of those decisions. This background influences decisions on engineering objects in a very complex way. Appropriately selected combination of engineering object variants may be a compromise in a coordinated product definition. The authors of this paper recognized that conventional model space construction...
Knowledge based methodology is one of the primary areas of development in engineering problem solving methods for decades. In the meantime, product definition has been moved into model space. Establishment of the STEP (Standard for the Exchange of Product Model Data, ISO 10303) product model standard and it application at leading industries during 90's facilitated development of model based integrated...
Friction effects are complex, strongly nonlinear phenomena for the description of which various models of numerous independent parameters have been developed in the past decades. Normally they simply have to be compensated in control systems in which they appear as undesired perturbations. In other tasks as acceleration/deceleration of wheeled vehicles they are key factors determining the limits of...
Recent developments in engineering produced a new technology for information intensive environment. A definite part of the physical world, typically a product and its operating environment is described in a computer system for a virtual space in order to data management during development, analysis, production, marketing, support, and recycling. One of the recent researches by the authors of this...
In this paper the operation of a recently introduced novel version of the popular “Model Reference Adaptive Controller (MRAC)” is compared with that of a simple version of its possible traditional implementations. The “traditional implementations” normally use Lyapunov's 2nd (“direct”) method for adaptive tuning of the controllers' parameters. This method yields global asymptotic stability but its...
Integration and adding intelligence are essential objectives in development and application of information systems. An old wish of engineers is to have a highly integrated system for the handling of all necessary information during the entire lifecycle of an industrial product. Development of modeling and simulation based product lifecycle management (PLM) systems grounded the realization of such...
The “Model Reference Adaptive Control (MRAC)” is a popular approach from the early nineties to our days. Its basic idea is the application of proper feedback that makes the behavior of the controlled system identical to that of the “reference model”. It has many particular variants with the common feature that they are designed by the use of Lyapunov's 2nd method. Though this approach normally guarantees...
In the case of a crane that carries its payload swinging on a cable precise control of a subsystem passively connected to a directly controllable one by elastic connection is needed. Normally the connected degree of freedom has little damping and it is apt to keep swinging accordingly. Traditionally the "input shaping technology" is applied for cranes to assist the human operator responsible...
The “Model Reference Adaptive Control (MRAC)” is a popular approach from the early nineties to our days. Its basic idea is the application of proper feedback that makes the behavior of the controlled system identical to that of the “reference model” that normally is simple enough to control. The idea has many particular variants with the common feature that they are designed by the use of Lyapunov's...
Intelligence in engineering systems is expected to gain much more attention during the next years than presently because making interdependent decisions along contextual chains by an engineer increasingly requires reproduction of earlier decisions by other engineers. While a single decision on an object parameter or parameter group in a product structure may be influenced by several humans, humans...
The classical approaches in the adaptive control of Classical Mechanical Systems as the “Adaptive Inverse Dynamics Controller (AIDC)” or the “Adaptive Slotine-Li Controller (ASLC)”, as well as several implementations of the idea of the “Model Reference Adaptive Control (MRAC)” have the common feature that they are designed by the use of Lyapunov's 2nd (“direct”) method that normally applies a quadratic...
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