scholarly journals A Study of Adhesion Force Model for Wheel Slip Prevention Control

2004 ◽  
Vol 47 (2) ◽  
pp. 496-501 ◽  
Author(s):  
Hiro-o YAMAZAKI ◽  
Masao NAGAI ◽  
Takayoshi KAMADA
Keyword(s):  
Adhesion Force ◽  
Force Model ◽  
Wheel Slip

DEM–CFD analysis of fluidization behavior of Geldart Group A particles using a dynamic adhesion force model

2013 ◽  
Vol 248 ◽  
pp. 143-152 ◽  
Author(s):  
Tomonari Kobayashi ◽  
Toshitsugu Tanaka ◽  
Naoki Shimada ◽  
Toshihiro Kawaguchi
Keyword(s):  
Adhesion Force ◽  
Force Model ◽  
Cfd Analysis ◽  
Group A

Experimental Identification of Elastic, Damping and Adhesion Forces in Collision of Spherical Sliders With Stationary Magnetic Disks

2004 ◽  
Author(s):  
Kyosuke Ono ◽  
Satoshi Oohara
Keyword(s):  
Adhesion Force ◽  
Contact Theory ◽  
Force Model ◽  
Adhesion Forces ◽  
Lubricant Thickness ◽  
Damping Force ◽  
Magnetic Disks ◽  
Magnetic Disk ◽  
Damping Effect ◽  
Experimental Identification

This paper deals with the experimental identification of elastic, damping and adhesion forces in the dynamic collision of a spherical slider with a stationary magnetic disk. We used rough Al2O3TiC and smooth glass spherical sliders with a radius of 1 mm, and magnetic disks with four different lubricant film thicknesses of 0, 1, 2, and 3 nm. We found that the Al2O3TiC slider shows ordinary approach and rebound processes, whereas the glass slider showed a velocity drop at the end of the rebound process when the lubricant thickness was 1, 2 and 3 nm. We identified the elastic force factors in the approaching and rebound processes, based on the Herztian contact theory, and the damping force factors based on a damping force model that is proportional to slider velocity and penetration depth (contact area). From the drop in velocity when the slider and disk separated, we found that the dynamic adhesion force is almost equal to the static pull-off force, except for with a 3nm lubricant thickness. The dynamic adhesion force with 3 nm lubricant thickness is significantly higher probably because of squeeze damping effect.

scholarly journals Fuzzy Sliding Mode Wheel Slip Ratio Control for Smart Vehicle Anti-Lock Braking System

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2501 ◽  
Author(s):  
Jinhong Sun ◽  
Xiangdang Xue ◽  
Ka Wai Eric Cheng
Keyword(s):  
Controller Design ◽  
Adhesion Force ◽  
Sliding Mode ◽  
Rolling Friction ◽  
Resistance Force ◽  
Wheel Slip ◽  
Slip Ratio ◽  
Braking System ◽  
Wheel Rolling ◽  
Braking Torque

With the development of in-wheel technology (IWT), the design of the electric vehicles (EV) is getting much improved. The anti-lock braking system (ABS), which is a safety benchmark for automotive braking, is particularly important. Installing the braking motor at each fixed position of the wheel improves the intelligent control of each wheel. The nonlinear ABS with robustness performance is highly needed during the vehicle’s braking. The anti-lock braking controller (CAB) designed in this paper considered the well-known adhesion force, the resistance force from air and the wheel rolling friction force, which bring the vehicle model closer to the real situation. A sliding mode wheel slip ratio controller (SMWSC) is proposed to yield anti-lock control of wheels with an adaptive sliding surface. The vehicle dynamics model is established and simulated with consideration of different initial braking velocities, different vehicle masses and different road conditions. By comparing the braking effects with various CAB parameters, including stop distance, braking torque and wheel slip ratio, the SMWSC proposed in this paper has superior fast convergence and stability characteristics. Moreover, this SMWSC also has an added road-detection module, which makes the proposed braking controller more intelligent. In addition, the important brain of this proposed ABS controller is the control algorithm, which can be used in all vehicles’ ABS controller design.

Numerical Analysis of Microwaviness-Excited Vibrations of a Flying Head Slider at Touchdown

2017 ◽  
Author(s):  
Kyosuke Ono
Keyword(s):  
Adhesion Force ◽  
Hard Disk Drives ◽  
Force Model ◽  
Air Bearing ◽  
Single Degree Of Freedom ◽  
Disk Interface ◽  
Head Slider ◽  
Bearing Stiffness ◽  
Bearing Force ◽  
Parameter Values

As an extension of the study presented in ISPS 2016, vibration characteristics of a commercially used head slider in hard disk drives at touchdown are analyzed by using a single degree-of-freedom (DOF) slider model, improved asperity adhesion force model, and air-bearing force model. Using parameter values at the head/disk interface, the total interfacial force was evaluated for various air bearing stiffness ratios r. Microwaviness (MW)-excited slider vibration was simulated near the boundary of instability onset (r = 2.4), and slight instability conditions at r = 2. It was found that the simulated results at r = 2.4 and 2 agree well with the touchdown vibrations of actual slider at ID and MD, respectively. The possibility of surfing recording is discussed.

Experimental Identification of Elastic, Damping and Adhesion Forces in Collision of Spherical Sliders With Stationary Magnetic Disks

2005 ◽  
Vol 127 (2) ◽  
pp. 365-375 ◽  
Author(s):  
Kyosuke Ono ◽  
Satoshi Ohara
Keyword(s):  
Adhesion Force ◽  
Contact Theory ◽  
Force Model ◽  
Adhesion Forces ◽  
Lubricant Thickness ◽  
Damping Force ◽  
Magnetic Disks ◽  
Magnetic Disk ◽  
Damping Effect ◽  
Experimental Identification

This paper deals with the experimental identification of elastic, damping and adhesion forces in the dynamic collision of a spherical slider with a stationary magnetic disk. We used rough Al2O3TiC and smooth glass spherical sliders with a radius of 1 mm, and magnetic disks with four different lubricant film thicknesses of 0, 1, 2, and 3 nm. We found that the Al2O3TiC slider shows ordinary approach and rebound processes, whereas the glass slider showed a velocity drop at the end of the rebound process when the lubricant thickness was 1, 2, and 3 nm. We identified the elastic force factors in the approach and rebound processes, based on Herztian contact theory, and the damping force factors based on a damping force model that is proportional to slider velocity and penetration depth (contact area). From the drop in velocity when the slider and disk separated, we found that the dynamic adhesion force is almost equal to the static pull-off force except for with a 3 nm lubricant thickness. The dynamic adhesion force with a 3 nm lubricant thickness is significantly higher, probably because of squeeze damping effect.

Adhesion Control of High Speed Train under Electric-Pneumatic Braking

2011 ◽  
Vol 199-200 ◽  
pp. 1074-1079
Author(s):  
Zhe Ming Chen ◽  
Ren Luo
Keyword(s):  
High Speed ◽  
Adhesion Force ◽  
Sliding Mode ◽  
Recursive Least Squares ◽  
Vehicle Speed ◽  
High Speed Train ◽  
Wheel Slip ◽  
Braking Force ◽  
Brake Cylinder ◽  
Adhesion Control

As the result of wheel-rail surface conditions, external environment and vehicle speed change, the state of adhesion is changing. In order to ensure the validity and security of high speed train in braking, and obtain the maximum utilization of adhesion, control system must provide a stable and effective braking force. This paper presents a new pressure model of brake cylinder, and a 90 DOF vehicle dynamic model, uses Oldrich Polach’s model to calculate adhesion force, and adds a track irregularity on vehicle model. Switch signal controls brake cylinder. Direct torque strategy controls the induction motor, Recursive least squares determines the adhesion-slip state of wheels, Sliding mode control Strategy calculates the best braking force. The simulation results show the high brake performance of this wheel-slip prevention system, and the desired objective of control.

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