Normalized Study of Three-Parameter System in the Time Domain and Frequency Domain

Jiao, Xiaolei; Zhao, Yang; Ma, Wei

doi:10.1155/2017/9153178

Cited by 2 publications

(1 citation statement)

References 26 publications

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“…The results show that when the stiffness is of the softening type, a cubic stiffness can provide improvement in the transmissibility for frequencies around and above the resonance. Jiao et al [19] proposed a normalized analytical model for three-parameter-VI in the time domain and frequency domain by using an analytical method and studied the dynamic behavior of three-parameter-VI in the time domain and frequency domain. Wang et al [20] explored the usage of nonlinear stiffness elements to improve the transmissibility efficiency of a sufficient linear damped vibration isolator featured with the Zener model and promoted practical applications of such nonlinear vibration isolators.…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of a four-parameter vibration isolator with frequency-dependent damping and its implementation based on GERF

Wang

Liao

Peng

et al. 2023

Smart Mater. Struct.

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To improve the vibration isolation performance, a conventional passive two-parameter vibration isolator (VI) usually adopts the method of adding constant damping for energy dissipation. A compromise is made between the suppression of resonance peak and the rapid attenuation of transmissibility in the high-frequency band. A four-parameter-VI with frequency-dependent damping is a potential solution for this problem. The theoretical models of system transmissibility and equivalent damping are established by a normalization method, and the vibration isolation performance is compared with that of the two-parameter-VI and the three-parameter-VI. A novel four-parameter-VI with damping generated by a giant electrorheological fluid (GERF) damper is designed. The mechanical properties of the GERF damper are tested, and its damping effect is evaluated using an equivalent linearization method. Then, the vibration isolation performance of the four-parameter-VI is tested. The results show that: the vibration isolation performance of the four-parameter-VI can be affected by the damping ratio and the mass ratio. The four-parameter-VI exhibits the frequency-dependent damping characteristic of large damping in the low-frequency band and small damping in the high-frequency band by appropriately setting parameters. The vibration isolation ratio of the four-parameter-VI to white noise reaches 91.1% in the time domain with appropriate parameters, and the peak of the power spectral density curves decreases from 1.2e-3 g2/Hz to 0.16e-3 g2/Hz with a reduction of 1.04e-3 g2/Hz.

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Section: Introductionmentioning

confidence: 99%

Modeling and analysis of a four-parameter vibration isolator with frequency-dependent damping and its implementation based on GERF

Wang

Liao

Peng

et al. 2023

Smart Mater. Struct.

View full text Add to dashboard Cite

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Theoretical and Experimental Study on the Performance of Hermetic Diaphragm Squeeze Film Dampers for Gas-Lubricated Bearings

Wang,

Zhang,

Han

et al. 2024

Chin. J. Mech. Eng.

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Low damping characteristics have always been a key sticking points in the development of gas bearings. The application of squeeze film dampers can significantly improve the damping performance of gas lubricated bearings. This paper proposed a novel hermetic diaphragm squeeze film damper (HDSFD) for oil-free turbomachinery supported by gas lubricated bearings. Several types of HDSFDs with symmetrical structure were proposed for good damping performance. By considering the compressibility of the damper fluid, based on hydraulic fluid mechanics theory, a dynamic model of HDSFDs under medium is proposed, which successfully reflects the frequency dependence of force coefficients. Based on the dynamic model, the effects of damper fluid viscosity, bulk modulus of damper fluid, thickness of damper fluid film and plunger thickness on the dynamic stiffness and damping of HDSFDs were analyzed. An experimental test rig was assembled and series of experimental studies on HDSFDs were conducted. The damper fluid transverse flow is added to the existing HDSFD concept, which aims to make the dynamic force coefficients independent of frequency. Although the force coefficient is still frequency dependent, the damping coefficient at high frequency excitation with damper fluid supply twice as that without damper fluid supply. The results serve as a benchmark for the calibration of analytical tools under development.

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Normalized Study of Three-Parameter System in the Time Domain and Frequency Domain

Cited by 2 publications

References 26 publications

Modeling and analysis of a four-parameter vibration isolator with frequency-dependent damping and its implementation based on GERF

Modeling and analysis of a four-parameter vibration isolator with frequency-dependent damping and its implementation based on GERF

Theoretical and Experimental Study on the Performance of Hermetic Diaphragm Squeeze Film Dampers for Gas-Lubricated Bearings

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