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OPTIMIZATION OF A FUZZY CONTROL DESIGN WITH RESPECT TO A PARALLEL MECHANISM WORKSPACE
Andrš, Ondřej ; Maga, Dušan (referee) ; Singule, Vladislav (referee) ; Březina, Tomáš (advisor)
The Ph.D. thesis is focused on using the fuzzy logic for control of a parallel manipulator based on a Stewart platform. The proposed mechanism makes possible to simulate the physiological movements of the human body and observe degradation processes of the cord implants. Parallel manipulators such as a Stewart platform represent a completely parallel kinematic mechanism that has major differences from typical serial link robots. However, they have some drawbacks of relatively small workspace and difficult forward kinematic problems. Generally, forward kinematic of a parallel manipulators is very complicated and difficult to solve. This thesis presents a simple and efficient approach to design simulation model of forward kinematic based on Takagi-Sugeno type fuzzy inference system. The control system of the parallel manipulator id based on state-space and fuzzy logic controllers. The proposed fuzzy controller uses a Sugeno type fuzzy inference system (FIS) which is derived from discrete position state-space controller with an input integrator. The controller design method is based on anfis (adaptive neuro-fuzzy inference system) training routine. It utilizes a combination of the least-squares method and the backpropagation gradient descent method for training FIS membership function parameters to emulate a given training data set. The proposed fuzzy logic controllers are used for the control of a linear actuator. The capabilities of the designed control system are shown on verification experiment.
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Mobile platform for testing autonomous vehicle sensors
Valla, Tomáš ; Ramík, Pavel (referee) ; Štětina, Josef (advisor)
The aim of this diploma thesis is to create a design of a mobile platform. The platform contains all the necessary electronics from conventional RC models and thus the RC control itself is guaranteed. It is also equipped with a light but solid platform, which is suitable for attaching the necessary sensors, lidars, cameras and other necessary accessories. Part of the work is also a brief overview of the division of RC models and evaluation of the components used for possible construction of the model. The final chapter is devoted to FEM analysis, where the load-bearing capacity of the platform under different load models is checked by means of structural analysis. Using modal analysis, the platform's own critical frequencies were determined and compared to the frequencies that are transmitted when driving on the road.
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Stewart platform – model
Těšický, Lukáš ; Vetiška, Jan (referee) ; Březina, Lukáš (advisor)
The bachelor thesis deals with the creation of a multi-body mechatronic model of a Stewart platform in MSC Adams. There are also analyzed possibilities of utilization of the Stewart platform and other parallel manipulators in the industry.
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AeroWorks: Simulator Motion Platform
Morávek, Martin ; Kunovský, Jiří (referee) ; Chudý, Peter (advisor)
This diploma thesis is dealing with the concepts behind the Stewart platform based flight simulation phenomena along with the method of inverse kinematics computation. Further, a washout algorithm to provide appropriate vestibular sensing to the pilot and ensuring that platform will not reach its limits is presented. Digital filters designed to be used in the implementation of the washout algorithm and their characteristics are also covered. The last part describes the architecture of the whole system and the implementation of individual parts.
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Hexagonal Platform with Servo Control
Korgo, Tomáš ; Maršík, Lukáš (referee) ; Zemčík, Pavel (advisor)
Goal of the thesis is to show the possibilities of using ordinary hobbyist RC servos and means of their control by a computer. For demonstration of the capabilities of servos, we have created Stewart platform which is using hobbyist servos to position the platform. In the thesis there is explained principle of the inner working of a servo, their properties, abilities and also means of their control by a computer. In practical chapters of the thesis there is documented process of designing and implementing of functional Stewart platform along with specific properties of this platform which influence its design. This platform is also reviewed and based on the results we will show technical properties of the platform, advantages and disadvantages of using ordinary hobbyist servos to control the platform. Design of the platform and its documentation is created with respect to intent to make the ddesign, source codes, documentation available to public on wepages focused on aggregating of instructables and tutorials to make usage of outputs possible in practice.
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MR Strut of Steward Platform for Vibration and Shock Isolation
Macháček, Ondřej ; Šindelář, Martin (referee) ; Mazůrek, Ivan (advisor)
The thesis deals with design magnetorheological strut of vibration isolation adapter for cosmonautics. For its optimization is necessary to create several virtual models. The dynamic model of the mechanism - the Stewart platform, rheological model for determining the damping force of MR damper and model of the magnetic circuit to guarantee the required intensity in the gap. These models, along with controls models that are primarily concerned with strength calculations, will help with design. Designing using virtual models requires constant monitoring and verification. It is a rather broad topic including eliminate vibration also kinematics, dynamics, hydraulics, pneumatics and last but not least electronics and magnetism. It is necessary to communicate with experts in their field and use their knowledge and experience to create, but also to control of the individual models. The thesis was created in cooperation with Honeywell Aerospace Division (ESA).
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Mobile platform for testing autonomous vehicle sensors
Valla, Tomáš ; Ramík, Pavel (referee) ; Štětina, Josef (advisor)
The aim of this diploma thesis is to create a design of a mobile platform. The platform contains all the necessary electronics from conventional RC models and thus the RC control itself is guaranteed. It is also equipped with a light but solid platform, which is suitable for attaching the necessary sensors, lidars, cameras and other necessary accessories. Part of the work is also a brief overview of the division of RC models and evaluation of the components used for possible construction of the model. The final chapter is devoted to FEM analysis, where the load-bearing capacity of the platform under different load models is checked by means of structural analysis. Using modal analysis, the platform's own critical frequencies were determined and compared to the frequencies that are transmitted when driving on the road.
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AeroWorks: Simulator Motion Platform
Morávek, Martin ; Kunovský, Jiří (referee) ; Chudý, Peter (advisor)
This diploma thesis is dealing with the concepts behind the Stewart platform based flight simulation phenomena along with the method of inverse kinematics computation. Further, a washout algorithm to provide appropriate vestibular sensing to the pilot and ensuring that platform will not reach its limits is presented. Digital filters designed to be used in the implementation of the washout algorithm and their characteristics are also covered. The last part describes the architecture of the whole system and the implementation of individual parts.
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Hexagonal Platform with Servo Control
Korgo, Tomáš ; Maršík, Lukáš (referee) ; Zemčík, Pavel (advisor)
Goal of the thesis is to show the possibilities of using ordinary hobbyist RC servos and means of their control by a computer. For demonstration of the capabilities of servos, we have created Stewart platform which is using hobbyist servos to position the platform. In the thesis there is explained principle of the inner working of a servo, their properties, abilities and also means of their control by a computer. In practical chapters of the thesis there is documented process of designing and implementing of functional Stewart platform along with specific properties of this platform which influence its design. This platform is also reviewed and based on the results we will show technical properties of the platform, advantages and disadvantages of using ordinary hobbyist servos to control the platform. Design of the platform and its documentation is created with respect to intent to make the ddesign, source codes, documentation available to public on wepages focused on aggregating of instructables and tutorials to make usage of outputs possible in practice.
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OPTIMIZATION OF A FUZZY CONTROL DESIGN WITH RESPECT TO A PARALLEL MECHANISM WORKSPACE
Andrš, Ondřej ; Maga, Dušan (referee) ; Singule, Vladislav (referee) ; Březina, Tomáš (advisor)
The Ph.D. thesis is focused on using the fuzzy logic for control of a parallel manipulator based on a Stewart platform. The proposed mechanism makes possible to simulate the physiological movements of the human body and observe degradation processes of the cord implants. Parallel manipulators such as a Stewart platform represent a completely parallel kinematic mechanism that has major differences from typical serial link robots. However, they have some drawbacks of relatively small workspace and difficult forward kinematic problems. Generally, forward kinematic of a parallel manipulators is very complicated and difficult to solve. This thesis presents a simple and efficient approach to design simulation model of forward kinematic based on Takagi-Sugeno type fuzzy inference system. The control system of the parallel manipulator id based on state-space and fuzzy logic controllers. The proposed fuzzy controller uses a Sugeno type fuzzy inference system (FIS) which is derived from discrete position state-space controller with an input integrator. The controller design method is based on anfis (adaptive neuro-fuzzy inference system) training routine. It utilizes a combination of the least-squares method and the backpropagation gradient descent method for training FIS membership function parameters to emulate a given training data set. The proposed fuzzy logic controllers are used for the control of a linear actuator. The capabilities of the designed control system are shown on verification experiment.
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