Frequency domain properties of hydraulic bushing with long and short passages: System identification using theory and experiment

Chai, Tan; Dreyer, Jason T.; Singh, Rajendra

doi:10.1016/j.ymssp.2014.11.003

Cited by 10 publications

(24 citation statements)

References 20 publications

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“…The conservation of momentum between the chamber and the fluid passage can be expressed as Equation (3). The resistance R i (q i ) of the fluid passage can be modeled nonlinearly using the same orifice model as Eq.…”

Section: Characteristic Design Of Hydrobushingmentioning

confidence: 99%

Design of Hydraulic Bushing and Vehicle Testing for Reducing the Judder Vibration

et al. 2018

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Abstract. Generally, judder vibration is a low-frequency vibration phenomenon caused by a braking force imbalance that occurs when a vehicle is lightly decelerated within a range of 0.1 to 0.2g at a speed of 120 to 60 km/h. This comes from the change in the brake disk thickness (DTV), which is mainly caused by the side run-out (SRO) and thermal deformation. The adoption of hydro-bushing in the low arm G bushings of the vehicle front suspension has been done in order to provide great damping in a particular frequency range (<20Hz) in order to prevent this judder vibration from being transmitted to the body. The hydro bushing was formulated using a lumped parameter model. The fluid passage between the two chambers was modelled as a nonlinear element such as an orifice, and its important parameters (resistance, compliance) were measured using a simplified experimental setup. The main design parameters are the ratio of the cross-sectional area of the chamber to the fluid passage, the length of the fluid passage, etc., and their optimal design is such that the loss angle is greater than 45 ° in the target frequency range of 10 to 20 Hz. The hydro bushing designed for reducing the judder vibration was prepared for the actual vehicle application test and applied to the actual vehicle test. In this study, the proposed hydro bushing was applied to the G bushing of the low arm of the front suspension system of the vehicle. The loss angle of the manufactured hydro bushing was measured using acceleration signals before and after passing through the bushing. The actual vehicle test was performed on the noise dynamometer for the performance analysis of the judder vibration reduction.

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Section: Characteristic Design Of Hydrobushingmentioning

confidence: 99%

Design of Hydraulic Bushing and Vehicle Testing for Reducing the Judder Vibration

et al. 2018

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“…Hydraulic elastomeric devices are often employed in automotive powertrain and suspension systems because of their unique dynamic properties, leading to both vibration isolation and motion control [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. These properties are achieved by an internal fluid system working in tandem with the elastomeric structure of a bushing.…”

Section: Introductionmentioning

confidence: 99%

“…Despite some similarities with hydraulic engine mounts that have been extensively studied [1][2][3][4][5][6][7][8][9], the behavior of hydraulic bushings is quite different and merits its own in-depth studies [10][11][12][13][14][15][16][17][18]. Prior, though limited, investigations of these devices have largely focused on simpler transfer function type formulations based on the linear time-invariant (LTI) system theory [10][11][12][13][14][15][16]. For instance, Arzanpour and Golnaraghi [12] developed a reduced order linear system model for a hydraulic bushing which attempts to capture some aspects of the physics, such as fluid resistance, compliance, and inertance.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Arzanpour and Golnaraghi [12] developed a reduced order linear system model for a hydraulic bushing which attempts to capture some aspects of the physics, such as fluid resistance, compliance, and inertance. Chai et al [13][14][15][16] further developed the linear models for frequency and time domain characteristics for a laboratory bushing device and even introduced a nonlinear fluid resistance term [17]. Fredette et al [18] recently developed a new laboratory experiment to measure the nonlinear fluid compliance of hydraulic bushing pumping chambers.…”

Section: Introductionmentioning

confidence: 99%

“…Under harmonic excitation, hydraulic bushings exhibit significant amplitude dependent behavior [10,11,[14][15][16][17][18], which cannot be described by the linear time-invariant system theory.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Harmonic amplitude dependent dynamic stiffness of hydraulic bushings: Alternate nonlinear models and experimental validation

Fredette

Dreyer

Rook

et al. 2016

Mechanical Systems and Signal Processing

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The dynamic stiffness properties of automotive hydraulic bushings exhibit significant amplitude sensitivity which cannot be captured by linear time-invariant models. Quasi-linear and nonlinear models are therefore proposed with focus on the amplitude sensitivity in magnitude and loss angle spectra (up to 50 Hz). Since the model parameters of a production bushing are unknown, dynamic stiffness tests and laboratory experiments are utilized to extract model parameters. Nonlinear compliance and resistance elements are incorporated, including their interactions in order to improve amplitude sensitive predictions. New solution approximations for the new system equations (containing both nonlinear compliance and resistance elements) refine the multi-term harmonic balance term method. Quasi-linear models yield excellent accuracy but lack the ability to predict trends in amplitude sensitivity since they rely on available dynamic stiffness measurements. Nonlinear models containing both nonlinear resistance and compliance elements yield superior predictions to those of prior models (with a single resistance or compliance nonlinearity), while also providing more physical insight. Suggestion for further work is briefly mentioned.

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Effect of fractionally damped compliance elements on amplitude sensitive dynamic stiffness predictions of a hydraulic bushing

Fredette

Singh

2018

Mechanical Systems and Signal Processing

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Frequency domain properties of hydraulic bushing with long and short passages: System identification using theory and experiment

Cited by 10 publications

References 20 publications

Design of Hydraulic Bushing and Vehicle Testing for Reducing the Judder Vibration

Design of Hydraulic Bushing and Vehicle Testing for Reducing the Judder Vibration

Harmonic amplitude dependent dynamic stiffness of hydraulic bushings: Alternate nonlinear models and experimental validation

Effect of fractionally damped compliance elements on amplitude sensitive dynamic stiffness predictions of a hydraulic bushing

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