Self-Synchronization and Vibration Isolation Theories in Anti-resonance System with Dual-Motor and Double-Frequency Actuation

With the rapid development of petroleum exploitation industry, vibrating screen actuated with a single frequency is unsuitable to separate cuttings from drilling fluid, since it usually results in screen blocking. Hence, for solving the above-mentioned problem, tri-motor excitation with double-frequency in far resonance system is introduced. This paper aims to explore the self-synchronization mechanism of the proposed system. First, dynamic equation is established according to physical model of the system. Then, displacement response of the system in steady state is obtained with dynamic formulas. Subsequently, synchronous condition among the three exciters is determined by small parameters method, and criterion of synchronous stability among the three exciters is derived by Poincare-Lyapunov method. Finally, in light of the differential motion equation, Runge-Kutta principle is assigned to validate the reliability of self-synchronous theory and the stability of the double-frequency system. The results indicate that electromagnetic torques of low-frequency motors are dynamically antisymmetric in synchronous operation, and synchronous ability of the system is determined by the mass ratio among the rotors. In addition, stable phase difference among the rotors is significantly influenced by the structural parameters of the system. And this study will be helpful for the improvement of separation technology.

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A New Cascaded Stochastic Resonance System and its Application to Weak Double-Frequency Signal Separation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.511-512.346 ◽

2014 ◽

Vol 511-512 ◽

pp. 346-351

Author(s):

Hai Bin Zhang ◽

Si Liang Lu ◽

Shang Bin Zhang ◽

Ke Sai Ouyang ◽

Fan Rang Kong

Keyword(s):

Stochastic Resonance ◽

Signal Separation ◽

Single Frequency ◽

Resonance System ◽

Frequency Signal ◽

Pass Filter ◽

Double Frequency ◽

Useful Signal ◽

Promising Application ◽

High Pass

Weak signal detection has attracted many researchers attention all over the world. Most of the methods focus on the single frequency signal. This paper introduces a new method to separate the weak double-frequency signal overwhelmed in heavy background noise. The cascaded stochastic resonance (SR) system (CSRS) is composed of a bistable SR model in the first stage and a tristable one in the second. Based on the characteristic of the SR system, we can amplify the useful signal of high frequency using twice sampling technic to make its parameters matching the requirements of the system. In our proposed cascade stochastic resonance system, we highlight the appointed frequency from high to low successfully with adjusting the twice sampling multiple and the high pass filter band. The signal composition of different frequency can be obtained from the systems two stage output. Simulated experiment validates the CSRSs availability in weak double-frequency signal separation and also its promising application in a more complex mixed signal.

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Investigation on Harmonic Response of Pneumatic Vibration Isolation System with Single and Double-Frequency Excitations

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.34-35.1140 ◽

2010 ◽

Vol 34-35 ◽

pp. 1140-1144 ◽

Cited By ~ 1

Author(s):

Yan Chun Zhong ◽

Qing Jun Yang ◽

Gang Bao

Keyword(s):

Frequency Response ◽

Vibration Isolation ◽

Single Frequency ◽

Combination Resonance ◽

Harmonic Frequency ◽

Isolation System ◽

Vibration Isolation System ◽

Double Frequency ◽

Frequency Excitation ◽

Zero Frequency

In this paper, a nonlinear model of pneumatic vibration isolator was established, considering the volumetric compressibility of air. Based on this, simulation analyses were done using matlab/simulink software. The response to two different types of disturbances is studied: single-frequency excitation and double-frequency excitation. Single-frequency excitation can induce harmonic frequency response and offset response at the zero frequency. When the frequency is near to the the linearized natural frequency, the harmonic frequency response become stronger. Nonlinear characters have much to do with the drive amplitude. When the drive amplitude become large, the nonlinear characters are more obvious. Double-frequency excitation can induce combination resonance. When the two drive frequencys are close, combination resonance are more strong.

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Comparison of TEM and STM observations of small silver clusters on different carbon supports

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010017445x ◽

1990 ◽

Vol 48 (4) ◽

pp. 264-265

Author(s):

Bernd Tesche ◽

Tobias Schilling

Keyword(s):

Vibration Isolation ◽

Pyrolytic Graphite ◽

Carbon Film ◽

Silver Clusters ◽

Carbon Supports ◽

Stacking Order ◽

System P ◽

High Resolution Tem ◽

High Degree ◽

Degree Of Order

The objective of our work is to determine:a) whether both of the imaging methods (TEM, STM) yield comparable data andb) which method is better suited for a reliable structure analysis of microclusters smaller than 1.5 nm, where a deviation of the bulk structure is expected.The silver was evaporated in a bell-jar system (p 10−5 pa) and deposited onto a 6 nm thick amorphous carbon film and a freshly cleaved highly oriented pyrolytic graphite (HOPG).The average deposited Ag thickness is 0.1 nm, controlled by a quartz crystal microbalance at a deposition rate of 0.02 nm/sec. The high resolution TEM investigations (100 kV) were executed by a hollow-cone illumination (HCI). For the STM investigations a commercial STM was used. With special vibration isolation we achieved a resolution of 0.06 nm (inserted diffraction image in Fig. 1c). The carbon film shows the remarkable reduction in noise by using HCI (Fig. 1a). The HOPG substrate (Fig. 1b), cleaved in sheets thinner than 30 nm for the TEM investigations, shows the typical arrangement of a nearly perfect stacking order and varying degrees of rotational disorder (i.e. artificial single crystals). The STM image (Fig. 1c) demonstrates the high degree of order in HOPG with atomic resolution.

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Vibration isolation of power tool operators

PsycEXTRA Dataset ◽

10.1037/e574052012-019 ◽

1983 ◽

Author(s):

C. W. Suggs ◽

C. F. Abrams

Keyword(s):

Vibration Isolation

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Connection of a Scanning Tunneling Microscope with a Molecular Beam Epitaxy Chamber and Analysis of the Vibration Isolation System

Journal de Physique III ◽

10.1051/jp3:1995231 ◽

1995 ◽

Vol 5 (11) ◽

pp. 1871-1885 ◽

Cited By ~ 3

Author(s):

P. Krapf ◽

J.P. Lainé(*) ◽

Y. Robach ◽

L. Porte

Keyword(s):

Molecular Beam Epitaxy ◽

Scanning Tunneling Microscope ◽

Molecular Beam ◽

Vibration Isolation ◽

Scanning Tunneling ◽

Isolation System ◽

Vibration Isolation System ◽

Tunneling Microscope ◽

Molecular Beam Epitaxy Chamber

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An hourglass-type electromagnetic isolator with negative resistance electromagnetic shunt circuit

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209363 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 549-556

Author(s):

Yajun Luo ◽

Linwei Ji ◽

Yahong Zhang ◽

Minglong Xu ◽

Xinong Zhang

Keyword(s):

Vibration Isolation ◽

Electromechanical Coupling ◽

Coupling Effect ◽

Negative Resistance ◽

Isolation System ◽

Amplitude Vibration ◽

Vibration Responses ◽

The Stability ◽

Isolation Performance ◽

Shunt Circuit

The present work proposed an hourglass-type electromagnetic isolator with negative resistance (NR) shunt circuit to achieve the effective suppression of the micro-amplitude vibration response in various advanced instruments and equipment. By innovatively design of combining the displacement amplifier and the NR electromagnetic shunt circuit, the current new type of vibration isolator not only can effectively solve the problem of micro-amplitude vibration control, but also has significant electromechanical coupling effect, to obtain excellent vibration isolation performance. The design of the isolator and motion relationship is presented firstly. The electromechanical coupling dynamic model of the isolator is also given. Moreover, the optimal design of the NR electromagnetic shunt circuit and the stability analysis of the vibration isolation system are carried out. Finally, the simulation results about the transfer function and vibration responses demonstrated that the isolator has a significant isolation performance.

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