Browsing by Author "Tran Xuan, Tien"
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- ItemModelling of Dynamical and Statical Properties of a Car Seat with Adjustable Pressure ProfileTran Xuan, Tien; ; Cirkl David, doc. Ing. Ph.D. Skolitel : 55423- Derivation of the analytical model of the pneumatic spring system with lumped parameters + Analysis of the system using a multidisciplinary approach. + Numerical simulation of the model for different working conditions (constant stiffness and constant pressure mode, quasi-static load, dynamic load). + Investigation of the dynamical behavior of the system. Numerical simulation of transmission of acceleration.- Finding a solution to improve the system from the point of view of faster regulation of pressure inside the PSE Providing a theoretical basis for the idea of improvement and solution. Carrying out the numerical simulation of the improved system.- Investigation the influence of the PSE on transmission of acceleration. + Comparison of simulation results between original and improved systems. + Comparison of experimental results between original and improved systems. + Assessment of quality of the system improvement.- Creation of FEM model of the seat with adjustable pressure profile in interaction with a simplified model of the human body + Determination of suitable constitutive models for materials of seat's parts. + Modelling of interaction between a foam block with a PSE inserted and a mass to simulate the deformation of PSE and foam under static conditions. + Modelling of interaction between the car seat cushion with a PSE inserted and a simplified human body. + Calculation of the pressure profile in the contact zone between the seat and simplified human body. Comparison with the experimental results.
- ItemMODELLING OF DYNAMICAL BEHAVIOR OF PNEUMATIC SPRING - MASS SYSTEM(ACAD SCI CZECH REPUBLIC, INST THEORETICAL & APPLIED MECHANICS, PROSECKA 76, PRAGUE 9, 190 00, CZECH REPUBLIC, 2018) Tran Xuan, Tien; Cirkl, DavidThis article deals with the simulation model of a pneumatic spring element. The purpose of this spring is to be implemented into car seat cushioning and provide a change of pressure distribution in the contact zone between seat and passenger. This function is ensured by a feedback loop controlled electropneumatic circuit. The mathematical model of the system is described by analytical functions which represent mechanical behavior of pneumatic valves, PID controller and used materials. The variable volume of the spring is considered. Dynamical response of the spring-mass system to kinematic excitation is investigated using Matlab software and transfer functions of acceleration are presented in dependence on the level of pressurization of the spring.