scholarly journals Rarefaction cloaking: Influence of the fractal rough surface in gas slider bearings

2017 ◽  
Vol 29 (10) ◽  
pp. 102003 ◽  
Author(s):  
Wei Su ◽  
Haihu Liu ◽  
Yonghao Zhang ◽  
Lei Wu
Keyword(s):  
Rough Surface ◽  
Fractal Rough Surface ◽  
Slider Bearings

Dynamics of Deformable Fractal Surface in Contact with Harmonically Excited Rigid Flat

2017 ◽  
Vol 7 (2) ◽  
pp. 38-62
Author(s):  
Tamonash Jana ◽  
Anirban Mitra ◽  
Prasanta Sahoo
Keyword(s):  
Rough Surface ◽  
Dynamic Properties ◽  
Element Model ◽  
Harmonic Excitation ◽  
System Response ◽  
Fractal Surface ◽  
Fractal Rough Surface ◽  
Mass Damper ◽  
Relationship Of ◽  
Force Displacement

Dynamics of contact between a deformable fractal rough surface and a rigid flat is studied under harmonic excitation to the flat surface. Fractal surface is generated from the modified Weierstrass-Mandelbrot function and is imported to ANSYS to construct the finite element model of the same. A parameter called ‘nonlinearity exponent', is obtained from the force-displacement relationship of the rough surface and is used to find out the dynamic properties of the contacting interface using single spring-mass-damper model. The effect of variation in surface roughness and material properties on the system response is analyzed. The system exhibits superharmonic responses for different values of the nonlinearity exponent. The phase plot and time-displacement plots for the system are also furnished.

scholarly journals Synthetic aperture radar image of fractal rough surface

2016 ◽  
Vol 65 (7) ◽  
pp. 070301
Author(s):  
Wang Tong ◽  
Tong Chuang-Ming ◽  
Li Xi-Min ◽  
Li Chang-Ze
Keyword(s):  
Synthetic Aperture Radar ◽  
Rough Surface ◽  
Synthetic Aperture Radar Image ◽  
Radar Image ◽  
Synthetic Aperture ◽  
Fractal Rough Surface ◽  
Aperture Radar

Determination of fractal rough surface of polypyrrole film: AFM and electrochemical analysis

2014 ◽  
Vol 191 ◽  
pp. 104-112 ◽  
Author(s):  
Ahmad Sharifi-viand ◽  
Mohammad Ghasem Mahjani ◽  
Majid Jafarian
Keyword(s):  
Rough Surface ◽  
Electrochemical Analysis ◽  
Fractal Rough Surface ◽  
Polypyrrole Film

Static and Dynamic Analysis of Deformable Fractal Surface in Contact With Rigid Flat

2021 ◽  
pp. 141-174
Author(s):  
Tamonash Jana ◽  
Anirban Mitra ◽  
Prasanta Sahoo
Keyword(s):  
Dynamic Analysis ◽  
Rough Surface ◽  
Flat Surface ◽  
Contact System ◽  
Fractal Surface ◽  
Response Curves ◽  
Fractal Rough Surface ◽  
Static And Dynamic Analysis ◽  
Force Contact ◽  
Force Displacement

The chapter consists of static and dynamic analyses of a fractal rough surface in contact with a rigid flat. The fractal surface is constructed using modified Weierstrass-Mandelbrot function. A rigid flat surface touches the topmost point of the rough surface, which moves towards the rough surface and deforms it. Different contact parameters (e.g., contact force, contact area, contact stress, etc. for varying fractal and material properties are obtained through finite element based static analysis. A parameter denoting the degree of nonlinearity of the contact system is extracted from the force-displacement plot of the surface. This parameter is utilized to explain the dynamic behaviour of the fractal surface which vibrates under the influence of the externally excited rigid flat surface. The dynamic analysis of the contact system is carried out by modelling the contact interface as a single degree of freedom (SDOF) spring-mass-damper system. The dynamic behavior of the system is investigated in terms of frequency response curves, time-displacement plots, and phase plots.

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