Stability and vibration characteristics of a rotor-gas foil bearings system with high-static-low-dynamic-stiffness supports

Gu, Yongpeng; Ma, Yanhui; Ren, Gexue

doi:10.1016/j.jsv.2017.02.047

Cited by 31 publications

(25 citation statements)

References 29 publications

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“…Only the pure aerostatic bearings have the maximum pressure value being located in the x‐ coordinate axis. These characteristics are similar to those found in previous studies 24,25 …”

Section: Numerical Analysissupporting

confidence: 92%

Numerical and experimental investigation on the performance of hybrid porous gas journal bearings

Wang

Zhao

et al. 2020

Lubrication Science

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As the progress of the high-speed performance requirement for porous gas journal bearings continuing, the aerodynamic effect, which plays a key role in the state of lubrication, causes the porous gas journal bearings being gradually to be used as hybrid bearings. This paper firstly presents a theoretical analysis on the lubrication mechanism of the hybrid bearings. The gas flow in the porous and clearance is modelled by using the mass continuity equation. Two

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“…Only the pure aerostatic bearings have the maximum pressure value being located in the x‐ coordinate axis. These characteristics are similar to those found in previous studies 24,25 …”

Section: Numerical Analysissupporting

confidence: 92%

Numerical and experimental investigation on the performance of hybrid porous gas journal bearings

Wang

Zhao

et al. 2020

Lubrication Science

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“…In this case, beam and isolator or both have base excitation. The kinetic energy is given by equation (16) and the isolator potential energy in this case is corrected as follows…”

Section: Beam With Ungrounded Hslds Isolator Under Base Excitationmentioning

confidence: 99%

“…This case is similar to the previous case, with this difference that instead of direct force on the beam, the base excitation only applied to the beam and the isolator remains fixed. Kinetic energy is the sum of equations (3) and (16), the potential energy is the sum of equations (3) and (7) and the dissipated energy in in accordance with equation 3. Then the equation of motion in this case is given in the following form…”

Section: Beam With Grounded Hslds and Tmd Isolators Under Base Excitamentioning

confidence: 99%

“…In recent years to design isolator with the HSLDS characteristics in addition to springs structures, the magnetic spring, 8 rotor-gas foil bearings system, 16 solid and liquid mixture 17 and so on are used. Dong et al investigated a magnetic vibration isolator with the feature of the HSLDS isolator, which is constructed by combining a magnetic negative stiffness spring (MNSS) with a spiral flexure spring (SFS) in parallel.…”

Section: Introductionmentioning

confidence: 99%

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Tuned mass damper and high static low dynamic stiffness isolator for vibration reduction of beam structure

Raei

Dardel

2019

Proceedings of the Institution of Mechanical Engineers, Part K:

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In this work, the combination effect of tuned mass damper and high static low dynamic stiffness (HSLDS) isolator is investigated in reducing the vibration amplitude of Euler–Bernoulli beam with a nonlinear attachment. The performance of the absorber is studied in two cases; the first case, HSLDS isolator is one degree of freedom and the second case, two degree of freedom isolator is combined of HSLDS isolator and tuned mass damper absorber. By comparing the performance of these two isolators, it is revealed the two degree of freedom isolator has much better performance in direct force excitation and also improves the system performance in the base excitation. This isolator reduces the system amplitude at all frequencies, especially ultra-low frequencies, which is the main advantage to this isolator with respect to other isolators and reduces the natural frequency until the phenomenon of resonance occurs at a lower frequency. Moreover, decreasing the natural frequency increases the damping and in quasi zero stiffness and negative stiffness structure, the system has supercritical damping. This isolator is studied for positive, quasi zero and negative stiffness. The results show that the system with quasi zero stiffness has the best performances. Also, by increasing the excitation amplitude, the isolator loses its effectiveness.

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“…The trajectory curves for p=3 and p=4 tend to converge gradually and the rub-impact force is not involved [25]. Gu et al showed journal trajectories at different rotational speeds and studied the effects of dynamic stiffness and damping ratio on stability, unbalance and shock vibration characteristics [26]. Mohammad et al showed the unbalance trajectories of the nonlinear system to be capable of capturing sub-and superharmonics [27]- [28].…”

Section: Introductionmentioning

confidence: 99%

Vibration Detection and Experiment of PMSM High Speed Grinding Motorized Spindle Based on Frequency Domain Technology

Cheng

Gao

2019

Measurement Science Review

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The spindle vibrations of the high-speed grinding motorized spindle largely determine the machining quality and precision. In order to accurately predict the spindle vibrations of the PMSM high-speed grinding motorized spindle, the vibration causes are explored and analyzed. The radial vibration, inclined vibration, and axial vibration model are established. The experimental modal analysis method is proposed to analyze the dynamic response of the spindle and to identify the modal parameters of the spindle structure. Thereafter, the frequency response function (FRF) is calculated by self-power spectrum and cross-power spectrum. It is transformed into the vibration spectrum analysis of the spindle. The least-square method is used to fit the radial trajectory of the spindle. This paper aims to propose double standard spheres for 5-DOF spindle vibrations used to detect the spindle vibrations. In the experiment, the method proposed in this paper can effectively and accurately determine the causes of the spindle vibrations. The spectrum analysis and the trajectory are common tools in the spindle vibration detection.

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Stability and vibration characteristics of a rotor-gas foil bearings system with high-static-low-dynamic-stiffness supports

Cited by 31 publications

References 29 publications

Numerical and experimental investigation on the performance of hybrid porous gas journal bearings

Numerical and experimental investigation on the performance of hybrid porous gas journal bearings

Tuned mass damper and high static low dynamic stiffness isolator for vibration reduction of beam structure

Vibration Detection and Experiment of PMSM High Speed Grinding Motorized Spindle Based on Frequency Domain Technology

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