scholarly journals An Interaction Force Calculation Method for Virtual Environment

1997 ◽  
Vol 33 (10) ◽  
pp. 1026-1034
Author(s):  
Tetsuo KOTOKU ◽  
Kouichi TAKAMUNE ◽  
Kiyoshi KOMORIYA ◽  
Kazuo TANIE
Keyword(s):  
Virtual Environment ◽  
Calculation Method ◽  
Interaction Force ◽  
Force Calculation

scholarly journals Understanding Depletion Induced Like-Charge Attraction from Self-Consistent Field Model

2017 ◽  
Vol 22 (1) ◽  
pp. 95-111 ◽  
Author(s):  
Pei Liu ◽  
Manman Ma ◽  
Zhenli Xu
Keyword(s):  
Mean Field ◽  
Interaction Force ◽  
Systematic Investigation ◽  
Self Consistent ◽  
Self Consistent Field ◽  
Anomalous Feature ◽  
Long Time ◽  
Ionic Size ◽  
Poisson Boltzmann ◽  
Force Calculation

AbstractThe interaction force between likely charged particles/surfaces is usually repulsive due to the Coulomb interaction. However, the counterintuitive like-charge attraction in electrolytes has been frequently observed in experiments, which has been theoretically debated for a long time. It is widely known that the mean field Poisson-Boltzmann theory cannot explain and predict this anomalous feature since it ignores many-body properties. In this paper, we develop efficient algorithm and perform the force calculation between two interfaces using a set of self-consistent equations which properly takes into account the electrostatic correlation and the dielectric-boundary effects. By solving the equations and calculating the pressure with the Debye-charging process, we show that the self-consistent equations could be used to study the attraction between like-charge surfaces from weak-coupling to mediate-coupling regimes, and that the attraction is due to the electrostatics-driven entropic force which is significantly enhanced by the dielectric depletion of mobile ions. A systematic investigation shows that the interaction forces can be tuned by material permittivity, ionic size and valence, and salt concentration, and that the like-charge attraction exists only for specific regime of these parameters.

TOTAL FORCE CALCULATION METHOD FOR ER EFFECT OF LIQUID CRYSTALLINE POLYMER ON ONE-SIDED PATTERNED ELECTRODE SYSTEM

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1256-1262
Author(s):  
TAKEHITO KIKUCHI ◽  
JUNJI FURUSHO ◽  
AKIO INOUE
Keyword(s):  
Calculation Method ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Short Circuit ◽  
Crystalline Polymer ◽  
Type A ◽  
Electrode System ◽  
Total Force ◽  
Force Transmission ◽  
Force Calculation

In most studies, a bilateral electrode system in which an electrorheological fluid (ERF) is filled between a pair of electrodes has been used for application of the ERF. Some troubles exist in this configuration of the electrodes, for example a short-circuit. We have, therefore, proposed "one-sided pattern electrodes", or "OSPE" that are arranged on the only one-side surface. In order to use efficiently them for any controllable systems, characteristics of the ERF on OSPE should be cleared and a design procedure for it will be needed. In this paper, we proposed a total force calculation method for the one-sided patterned electrode (OSPE) system in which a liquid crystalline polymer (type-A LCP) was used. Experimental results and simulation results are compared on a force transmission system using the OSPE. In the proposed simulation method, we improved a mathematical model of the characteristics of the type-A LCP, "two phased viscosity model". By using this model, we improved the accuracy of a simulation result. These simulation methods will enables to design an optimal electrode pattern.

Study on vibration characteristics of hydraulic planetary transmission considering engine and torque converter excitation

2021 ◽  
pp. 095440702110477
Author(s):  
Wen Liu ◽  
Chunji Ren ◽  
Tengjiao Lin ◽  
Yanjun Zhang
Keyword(s):  
Calculation Method ◽  
Torque Converter ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Working Environment ◽  
Superposition Method ◽  
External Excitation ◽  
Mode Superposition Method ◽  
Planetary Transmission ◽  
Force Calculation

Large-size vehicle loaders are mainly used in various construction projects with complex working environment, which has a serious impact on the internal vibration of the whole system. In this study, the vibration characteristics of hydraulic planetary transmission of vehicle loader considering the influence of the external excitation are evaluated theoretically and experimentally. The output torque of the four-stroke six-cylinder diesel engine is obtained by force calculation of crank and connecting rod mechanism. The equivalent stiffness and damping of the torque converter are solved according to the torsional dynamic equation of the torque converter. The trapped oil area, oil pressure, and flow rate of gear meshing part are extracted to obtain the trapped oil pressure of variable-speed pump. Then, the multi-degree-of-freedom gear system dynamic model is established to calculate the meshing force, which is applied to vibration response analysis model by using mode superposition method. Lastly, the vibration response test is performed on the experimental prototype to verify the calculation method. The conclusion shows that the generation principle of external excitation and its calculation method in this paper are feasible in the analysis of dynamic characteristics of hydraulic planetary torque converter.

Study on Hoist Force Calculation of Hydraulic Lifting System Used in Pressure Balance Workover Rig

2011 ◽  
Vol 311-313 ◽  
pp. 2448-2451
Author(s):  
Si Zhu Zhou ◽  
Xin Bin Hu ◽  
Li Ming Cao ◽  
Ke Qiang Zhu ◽  
Ben Liu
Keyword(s):  
Calculation Method ◽  
Calculation Model ◽  
Operation Technique ◽  
Pressure Balance ◽  
Field Operation ◽  
Working Principle ◽  
Forward Calculation ◽  
Lifting System ◽  
Force Calculation ◽  
Depth Curve

Abstract. Pressure balance workover is an advanced downhole operation technique. It can hoist the strings of the tube or put it down under certain pressure. The research on pressure balance workover rig has become a hotspot in both domestic and overseas. Pressure balance workover operation technique has been widely used oversea. At the present time, relevant studies have been developed in China. In this paper, domestic and international technology status is fully analyzed, working principle of hydraulic lifting system is studied, then equivalent calculation model and calculation method of hoist force are put forward, calculation program of hoist force was compiled for the different oil pipe depth, curve and charts changing with the oil pipe depth are given, It provides a theory reference to field operation.

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