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Mechanical analysis of the subsystem of the tower crane
Urbánek, Roman ; Venský, Jiří (referee) ; Fuis, Vladimír (advisor)
The bachelor thesis deals with the solution of a subsystem of a tower crane with a passive effect (NNTP). First part describes tower cranes and their parts. The following part is a description of the theoretical and physical laws of statics and dynamics. In the practical part, various states of motion of a specific modeled subsystem are calculated, which shows a trolley of the tower crane. The aim of the calculation of each configuration is to determine the numerical values of the contact forces in the links, to analyze the dynamic quantities and to evaluate the functionality of the links. Numerical values of unknown parameters were calculated by solving a system of linear equations in the calculation software Matlab.
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Analýza soustav 5-ti těles s vazbami s pasivním účinkem
Podešva, Adam ; Marcián, Petr (referee) ; Fuis, Vladimír (advisor)
This work deals with the solution of systems of 5–bodies with passive effect (NNTP). Firstly, the theoretical and physical laws of statics are described and specific systems are solved. Important elements of the solution are kinematic analysis, system loosening, subsequent static analysis, equilibrium equations, their solution and analysis of results. In the first system, the influence of the passive effects and the change in the diameter of the pulley on the resulting force effects in the ropes are examined. Furthermore, in the second system, the work is extended by changing the trajectory of the movement of the body (weight) by means of an inclined plane, resulting in changes in the magnitude of the forces in the bonds. At the end of the work, the emphasis is on checking the bodies for rollover.
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Microdive with linear piezomotor
Grmela, Petr ; Vrba, Jaromír (referee) ; Koláčný, Josef (advisor)
The goal of this bachelor thesis is desctription of function and structure of piezoeletric motor „piezowawes“, creation his laboratory formation and folowing measuring his static characteristic (feed spead / drawing force). Except experimental conclusions is this thesis aim on theoretical analysis and physical explanation of piezoeletric phenomenon. This analys contains materials and important definition which are delaing with this phenomenon. This thesis also contains basic distribution of each kind of piezomotor and discuss aboat their practical use.
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Mechanical analysis of lift
Tesař, Jakub ; Kovář, Jaroslav (referee) ; Fuis, Vladimír (advisor)
The bachelor thesis deals with analysis of the system with seven solids with consideration of passive effect. In the first part of thesis describes the basics of statics and dynamics. Description of neutral and passive links, release method and reduction method. In the second part of the work are describing effects of passive effects on the movement state of the elevator. The individual bodies were released in the GeoGebra program. The aim of the example is to determine the contract forces in the links, check functionality of the links and state of motion. The solution took place in the computer program Matlab
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Analysis fitness machine with respect to frictional force and the rolling resistance
Pospíšilová, Kateřina ; Ševeček, Oldřich (referee) ; Majer, Zdeněk (advisor)
The bachelor's thesis deals with the solution of a system of bodies with NNTP bonds, i.e. pas-sive effects are included in the solution of the examples. The first part describes the theoretical foundations of statics, bonds and types of passive effects. Next, kinematic analysis, relaxation of bodies, static analysis and compilation of static balance equations are explained. This know-ledge is then applied to a specific example. In one example, three tasks are solved using the Matlab program. The template for the calculations was a real weight training machine, on which an experiment was subsequently performed to verify the calculated results. In the se-cond part of the work, it is mentioned what the finite element method is and what it is used for. Finally, a deformation analysis is performed in the Ansys program.
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Collection of solved problems from statics
ŠIMANOVÁ, Petra
The thesis is intended as a brief textbook for the subject Technical Mechanics I taught at the Faculty of Education, University of South Bohemia in České Budějovice. It includes the following topics: force and its torque, investigation of a system of forces acted in the same point of application, determination of resultant of two forces applied at different points, investigation of a general system of multiple plane forces, force equilibrium in simple technical applications, namely levers and beams. The theory is supported by examples with commented solution, in most cases both numerical and graphical. The work can be used by the teachers of the subject in lessons preparation as well as by students in self-education or in preparation for various exams or tests.
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Mechanical analysis of the subsystem of the tower crane
Urbánek, Roman ; Venský, Jiří (referee) ; Fuis, Vladimír (advisor)
The bachelor thesis deals with the solution of a subsystem of a tower crane with a passive effect (NNTP). First part describes tower cranes and their parts. The following part is a description of the theoretical and physical laws of statics and dynamics. In the practical part, various states of motion of a specific modeled subsystem are calculated, which shows a trolley of the tower crane. The aim of the calculation of each configuration is to determine the numerical values of the contact forces in the links, to analyze the dynamic quantities and to evaluate the functionality of the links. Numerical values of unknown parameters were calculated by solving a system of linear equations in the calculation software Matlab.
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Effect of body size and posture on biomechanics of walking
Matějovská, Zuzana ; Hora, Martin (advisor) ; Farana, Roman (referee)
During human walk, we balance internal muscle forces and external forces outside of the body, while trying to minimize physiological energetic expenditure and mechanical loading on the body. The biomechanics of walking can be affected by various factors, including body size. In individuals with greater body size, the ground reaction force increases, so it is expected that joint moment of the lower limb in individuals with greater body size should increases. However, this relationship is not always true - as documented by previous studies, larger individuals use moderating mechanisms in the form of postural adjustment of the lower limb which decreases the load on joints during walking. The aim of this diploma thesis is to investigate the effect of body size and posture on the biomechanics of walking in the stance phase of walking, and to verify the presence of moderating mechanisms. We obtained kinematic and kinetic data from nineteen probands. The data was collected during three types of walking - during normal walking, walking with extended knees and crouched walking. We used Visual3D software to calculate angles in joints and joints moments of the lower limb. The independent effect of body mass, lower limb length measured in Visual3D, lower limb length measured anthropometrically, biiliac...
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Mechanical analysis of lift
Tesař, Jakub ; Kovář, Jaroslav (referee) ; Fuis, Vladimír (advisor)
The bachelor thesis deals with analysis of the system with seven solids with consideration of passive effect. In the first part of thesis describes the basics of statics and dynamics. Description of neutral and passive links, release method and reduction method. In the second part of the work are describing effects of passive effects on the movement state of the elevator. The individual bodies were released in the GeoGebra program. The aim of the example is to determine the contract forces in the links, check functionality of the links and state of motion. The solution took place in the computer program Matlab
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Analýza soustav 5-ti těles s vazbami s pasivním účinkem
Podešva, Adam ; Marcián, Petr (referee) ; Fuis, Vladimír (advisor)
This work deals with the solution of systems of 5–bodies with passive effect (NNTP). Firstly, the theoretical and physical laws of statics are described and specific systems are solved. Important elements of the solution are kinematic analysis, system loosening, subsequent static analysis, equilibrium equations, their solution and analysis of results. In the first system, the influence of the passive effects and the change in the diameter of the pulley on the resulting force effects in the ropes are examined. Furthermore, in the second system, the work is extended by changing the trajectory of the movement of the body (weight) by means of an inclined plane, resulting in changes in the magnitude of the forces in the bonds. At the end of the work, the emphasis is on checking the bodies for rollover.
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