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ndltd-OhioLink-oai-etd.ohiolink.edu-osu12297025292021-08-03T05:55:05Z Development of nonlinear hydraulic engine mount models for transient responses given limited measurements He, Song <p>New procedures are proposed to estimate the effective nonlinear parameters ofhydraulic engine mount models and to predict transient responses. This is based on the premise that the analyst has access to limited measurements of the sinusoidal dynamic stiffness, so that the experimental effort for modeling work is minimized. First, the amplitude-sensitive and frequency-dependent dynamic stiffness data are collected and surface-interpolated. Base on an analogous mechanical model, a transfer function is suggested to curve-fit the empirical dynamic stiffnesses. System parameters are then estimated that provide a quantitative evaluation of the inertia-augmented fluid damping as well as the asymmetric stiffness characteristics. Additional damping induced by nonlinearities such as decoupler switching action is also revealed by extending the application to a free decoupler mount. Second, critical frequency domain specifications including maximum stiffness, maximum loss angle and their associated frequencies areanalytically derived and comparatively evaluated for the 4th/2nd type transfer function and its order-reduced form. Predicted dynamic stiffnesses using estimated parameters correlate well with experiments. Third, analytical expressions of the transmitted force and upper chamber pressure are derived for step-up, triangular and saw-tooth excitations. Key dynamic predictions in terms of overshoot, decaying rate and oscillating periods are verified by measured data. Simulation results including the response to a realistic displacement profile correlate well with experiments. Fourth, two existing nonlinear models are evaluated and an effective nonlinear mechanical model is suggested which provides insights into the multi-stage decoupler switching mechanism. Other nonlinearities introduced by preload, vacuum and dynamic stiffening effects are examined by comparing step-up and step-down responses. In particular, the vacuum-induced transitions are identified by curve-fitting the step responses. An improved nonlinear model is suggested that incorporates a piecewise compliance function for the upper chamber.</p> 2004 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1229702529 http://rave.ohiolink.edu/etdc/view?acc_num=osu1229702529 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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English
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NDLTD
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| author |
He, Song
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He, Song
Development of nonlinear hydraulic engine mount models for transient responses given limited measurements
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| author_facet |
He, Song
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He, Song
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| title |
Development of nonlinear hydraulic engine mount models for transient responses given limited measurements
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| title_short |
Development of nonlinear hydraulic engine mount models for transient responses given limited measurements
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| title_full |
Development of nonlinear hydraulic engine mount models for transient responses given limited measurements
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| title_fullStr |
Development of nonlinear hydraulic engine mount models for transient responses given limited measurements
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| title_full_unstemmed |
Development of nonlinear hydraulic engine mount models for transient responses given limited measurements
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| title_sort |
development of nonlinear hydraulic engine mount models for transient responses given limited measurements
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| publisher |
The Ohio State University / OhioLINK
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| publishDate |
2004
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1229702529
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| work_keys_str_mv |
AT hesong developmentofnonlinearhydraulicenginemountmodelsfortransientresponsesgivenlimitedmeasurements
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1719427717080809472
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