Research on the thickness control method of workbench oil film based on theoretical model

2018 ◽  
Author(s):  
Tang Pei ◽  
Lin Lin ◽  
Ge Liu ◽  
Liping Yu ◽  
Zhen Xu ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Control Method ◽  
Thickness Control ◽  
Oil Film

Vibration Suppression Evaluation of Smart Journal Bearing Using Giant Magnetostrictive Actuators

2015 ◽  
Vol 642 ◽  
pp. 323-327
Author(s):  
W. Wang ◽  
Sheng Zong Cai ◽  
Chao Wu ◽  
P.L. Wong
Keyword(s):  
Journal Bearing ◽  
Vibration Suppression ◽  
Control Method ◽  
Coupling Model ◽  
Oil Film ◽  
Mechanical Coupling ◽  
Magnetostrictive Actuators ◽  
Order Of Magnitude ◽  
Rotor Center ◽  
Set Up

A new kind of smart hydrodynamic journal bearings with giant magnetostrictive actuators (GMA) is introduced. The static and dynamic displacement outputs of the designed GMA are up to tens of microns, about the same order of magnitude as the conventional journal bearing clearance. Vibration suppression of the new smart journal bearing is theoretically evaluated using a simple Jeffcott rotor-bearing system. Kinematic equations are set up including the magneto-mechanical coupling model for GMA. The bearing oil film force under large vibration is calculated using a fast and efficient non-stationary oil film database technique. The unbalance vibration orbit of the rotor center is simulated. A simple synchronous proportional control method for GMA with different control phases and gains is investigated. The suppress effect of unbalance vibration and improvement of oil whip unstable speed is evaluated. The simulation proves that the new journal bearing has better stability, and that rotor vibration can be actively suppressed.

An Appraisal of a Proposed Active Squeeze Film Damper

1991 ◽  
Vol 113 (4) ◽  
pp. 750-754 ◽  
Author(s):  
C. Mu ◽  
J. Darling ◽  
C. R. Burrows
Keyword(s):  
Theoretical Model ◽  
Vibration Control ◽  
Numerical Experiments ◽  
Squeeze Film ◽  
Radial Clearance ◽  
Flexible Rotor ◽  
Oil Film ◽  
Squeeze Film Damper

A theoretical model for an active squeeze film damper (SFD) is introduced. The design makes it possible to change the radial clearance and land length of the SFD by adjusting the position of the damper ring. Expressions for the oil film forces are obtained. The vibration control of a flexible rotor is taken as an example of the application of the new design. The possibility of controlling rotor vibrations is demonstrated by means of numerical experiments.

Research on Control System of Large Capacity of Hollow Blow Molding Machine

2015 ◽  
Vol 713-715 ◽  
pp. 885-888
Author(s):  
Jian Huang ◽  
Wei Min Li ◽  
Guang Liang Lu
Keyword(s):  
Control System ◽  
Wall Thickness ◽  
Development Process ◽  
Control Method ◽  
Control Points ◽  
Thickness Control ◽  
Advantages And Disadvantages ◽  
Development Analysis ◽  
And Control

This paper elaborate the structure of parison wall thickness control system; choice hardware of the control system; study on the determination of the thickness control method and control points of parison wall; research on the formation of the parison wall thickness curve; summed up the development process of extruding plastic machine heating method on the basis of the plastic molding machinery development; analysis the various of heating methods; summed up the advantages and disadvantages of various heating methods; explore their advantages and disadvantages for providing reference.

Analysis of semitransparent layered materials by modulated photothermal radiometry: application to the bonding and thickness control of enamel coatings

1986 ◽  
Vol 64 (9) ◽  
pp. 1297-1302 ◽  
Author(s):  
Michel Egee ◽  
Robert Dartois ◽  
Jean Marx ◽  
Christian Bissieux
Keyword(s):  
Theoretical Model ◽  
Thermal Resistance ◽  
Coating Thickness ◽  
Thermophysical Properties ◽  
Layered Materials ◽  
Photothermal Radiometry ◽  
Experimental Results ◽  
Adhesion Properties ◽  
Thickness Control

To use modulated photothermal radiometry to control the thermophysical properties of enamel coatings, we first analytically resolve a theoretical model with two finite semitransparent layers and thermal-resistance interface; then we experimentally study several samples with various adhesion properties. The comparison of the experimental results with the calculations allows one, under the present conditions, to point out the possibilities and limits of the method, mainly for the control of coating thickness and delaminations.

Experimental Study on Vibration Properties and Control of Squeeze Mode MR Fluid Damper-Flexible Rotor System

2003 ◽  
Author(s):  
Jianxiao Wang ◽  
Guang Meng ◽  
Eric Hahn
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Rotor System ◽  
Flexible Rotor ◽  
Mr Fluid ◽  
Oil Film ◽  
Critical Speeds ◽  
Fluid Damper ◽  
Mr Fluid Damper ◽  
And Control

A squeeze mode MR fluid damper used for rotor vibration control is designed and manufactured, and the unbalance response properties and control method of a single-disk flexible rotor system supported by the damper are studied experimentally. It is found from the study that the magnetic pull force can decrease both the first critical speed and the critical amplitude; the oil film reaction force can decrease the amplitude at the undamped critical speeds, but increase the amplitude in a speed range between two undamped critical speeds. For the rotor system supported by a journal bearing and an MR fluid damper, it is possible to appear oil film instability as the increasing of the control current. The damper may have the best effect to make the vibration minimize within the range of all working speed by using on-off control method. The research show that the squeeze mode MR fluid damper has the advantages such as simple structure, clearly effectiveness, quick response, etc., and this kind of damper has a promising potential future in vibration control of flexible rotor systems.

Research on the Complete Dynamical Model of Tilting-Pad Bearings Considering the Coupling Moving of Shaft and Pads with Turbulent Oil Film

2011 ◽  
Vol 338 ◽  
pp. 611-617
Author(s):  
Zhen Shan Zhang ◽  
Xu Dong Dai
Keyword(s):  
Reynolds Number ◽  
Theoretical Model ◽  
Equilibrium Position ◽  
Numerical Results ◽  
Dynamical Model ◽  
Oil Film ◽  
Dynamic Coefficients ◽  
Tilting Pad ◽  
Tilting Pad Bearings

Considering the coupling moving of shaft and pads, a theoretical model for calculating the complete dynamic coefficients of tilting-pad bearing is described in this paper. The model includes the influence of turbulence. Based on this model, the effect of turbulence on journal equilibrium position, pads inclinations, and complete dynamic coefficients is investigated for given load cases. The numerical results indicate that the effect of turbulence is not neglected for higher Reynolds number.

Lithographical bending control method for a piezoelectric actuator

2009 ◽  
Vol 1 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Tamio Ikehashi ◽  
Etsuji Ogawa ◽  
Hiroaki Yamazaki ◽  
Tatsuya Ohguro
Keyword(s):  
Theoretical Model ◽  
Piezoelectric Material ◽  
Piezoelectric Actuator ◽  
Degrees Of Freedom ◽  
Control Method ◽  
Bridge Structure ◽  
Theoretical Formulation ◽  
Curvature Measurement ◽  
Multilayered Beam

This paper presents the theoretical formulation of a lithographical bending control (LBC) method that uses lithographical degrees of freedom to control the bending of a multilayered beam. LBC is applied to a piezoelectric actuator that uses PZT as the piezoelectric material. The theoretical model is compared with measurements using a weakly fixed bridge structure suited for curvature measurement.

scholarly journals Thickness Control Based on Robust Control Method for Reverse Cold Rolling Mill

1993 ◽  
Vol 79 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Yoshiharu NISHIDA ◽  
Akira KITAMURA ◽  
Syosei YAMAMOTO ◽  
Shinichi TARUMOTO
Keyword(s):  
Robust Control ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Control Method ◽  
Cold Rolling Mill ◽  
Thickness Control

The Application of PID Based on Optimized RBF in Thickness Control of Strip Steel

2012 ◽  
Vol 466-467 ◽  
pp. 52-56
Author(s):  
Yu Zhen Yu ◽  
Xin Yi Ren ◽  
Chun Yan Deng ◽  
Xiao Hui Wang
Keyword(s):  
Neural Network ◽  
Control System ◽  
Control Strategy ◽  
Pid Controller ◽  
Control Method ◽  
Rbf Neural Network ◽  
Pso Algorithm ◽  
Strip Thickness ◽  
Control Effect ◽  
Thickness Control

The strip thickness control system is difficult to establish an accurate mathematical model, and traditional PID control strategy has a poor adaptive ability, so the effect of control is always not satisfying. According to the problems above, a new control strategy of self-tuning PID controller based on RBF neural network whose parameters are optimized by PSO algorithm is proposed in the paper. The control method integrates advantages of RBF neural network as well as PID controller and good global search capability of PSO algorithm. The simulation results indicate that the method not only improves control performance and dynamic quality, but also has strong self-adapting ability and robustness. It achieved a very good control effect when used in strip thickness control system that proved the correctness and effectiveness of the control method.

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