Scholarly Works, Mechanical Engineering

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https://hdl.handle.net/10919/23262
Research articles, presentations, and other scholarship

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Browsing Scholarly Works, Mechanical Engineering by Department "Center for Vehicle Systems and Safety (CVeSS)"

Now showing 1 - 3 of 3
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    Dynamic Response Optimization of Complex Multibody Systems in a Penalty Formulation Using Adjoint Sensitivity
    Zhu, Yitao; Dopico, Daniel; Sandu, Corina; Sandu, Adrian (ASME, 2015-05-01)
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    Imparting motion to a test object such as a motor vehicle in a controlled fashion with improved accuracy
    (United States Patent and Trademark Office, 2017-05-09)
    An apparatus imparts motion to a test object such as a motor vehicle in a controlled fashion. A base has mounted on it a linear electromagnetic motor having a first end and a second end, the first end being connected to the base. A pneumatic cylinder and piston combination have a first end and a second end, the first end connected to the base so that the pneumatic cylinder and piston combination is generally parallel with the linear electromagnetic motor. The second ends of the linear electromagnetic motor and pneumatic cylinder and piston combination being commonly linked to a mount for the test object. A control system for the linear electromagnetic motor and pneumatic cylinder and piston combination drives the pneumatic cylinder and piston combination to support a substantial static load of the test object and the linear electromagnetic motor to impart controlled motion to the test object.
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    A Novel Double-Piston Magnetorheological Damper for Space Truss Structures Vibration Suppression
    Wang, Qiang; Ahmadian, Mehdi; Chen, Zhaobo (Hindawi, 2014-07-22)
    The design, fabrication, and testing of a new double-piston MR damper for space applications are discussed. The design concept for the damper is described in detail. The electromagnetic analysis of the design and the fabrication of the MR damper are also presented. The design analysis shows that the damper meets the weight and size requirements for being included in a space truss structure. The prototype design is tested in a damper dynamometer. The test results show that the damper can provide nearly 80 N of damping force at its maximum velocity and current. The test results also show that the seal drag could contribute significantly to the damping forces. Additionally, the test results indicate that both the work by the damper and damping force increase rapidly with increasing current at lower currents and taper off at higher currents as the damper starts to saturate. The damper force versus velocity plots show hysteresis in both pre- and postyield regions and asymmetric forces in jounce and rebound. A model is proposed for representing the force-displacement, force-velocity, and asymmetric forces observed in test results. A comparison of the modeling results and test data indicates that the model accurately represents the force characteristics of the damper.