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Durability test of magnetorheological fluid at high temperature
Grygárek, David ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This bachelor’s thesis is focused on behaviour of magnetorheological fluid during the durability test. In the first part are described basic properties of MR fluid and is defi-ned parameter LDE (Lifetime Dissipated Energy), which is used for prediction of durability of MR fluid. Primary part of thesis devote to realization of experiment, which measures a part of durability test at 70°C and monitoring the yield stress, vis-cosity and residual magnetism.
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Limiting and Degradation Processes of Magnetorheological Suspension Dampers
Roupec, Jakub ; Bauer, František (referee) ; Ondrůšek, Čestmír (referee) ; Dobeš, Petr (referee) ; Mazůrek, Ivan (advisor)
This work deals with the research of degradation of magnetorheological (MR) fluid during long-term loading under conditions that correspond to the real load in the linear MR devices such as dampers. The behaviour of MR fluid is described by a Bingham model of viscoplastic fluid. The parameters of this model are the yield stress and viscosity. Their values are determined by the shear rate from 1 to 2,8104 s-1. Results of durability tests show a significant decrease in viscosity of MR fluid, a gradual increase in yield stress in the off-state and a significant decrease in MR effect. The paper also described the effect of temperature on these parameters and there is also designed a method of non-assembly diagnostic of the MR fluid state in the damper using the "rate of pulsation."
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Limiting and Degradation Processes of Magnetorheological Suspension Dampers
Roupec, Jakub ; Bauer, František (referee) ; Ondrůšek, Čestmír (referee) ; Dobeš, Petr (referee) ; Mazůrek, Ivan (advisor)
This work deals with the research of degradation of magnetorheological (MR) fluid during long-term loading under conditions that correspond to the real load in the linear MR devices such as dampers. The behaviour of MR fluid is described by a Bingham model of viscoplastic fluid. The parameters of this model are the yield stress and viscosity. Their values are determined by the shear rate from 1 to 2,8104 s-1. Results of durability tests show a significant decrease in viscosity of MR fluid, a gradual increase in yield stress in the off-state and a significant decrease in MR effect. The paper also described the effect of temperature on these parameters and there is also designed a method of non-assembly diagnostic of the MR fluid state in the damper using the "rate of pulsation."
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Durability test of magnetorheological fluid at high temperature
Grygárek, David ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This bachelor’s thesis is focused on behaviour of magnetorheological fluid during the durability test. In the first part are described basic properties of MR fluid and is defi-ned parameter LDE (Lifetime Dissipated Energy), which is used for prediction of durability of MR fluid. Primary part of thesis devote to realization of experiment, which measures a part of durability test at 70°C and monitoring the yield stress, vis-cosity and residual magnetism.
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