scholarly journals DETERMINATION OF THE TRACTION FORCE OF THE WHEEL MOVER TAKING INTO ACCOUNT THE SLIDING SPEED OF THE PNEUMATIC TIRE IN THE CONTACT AREA

2021 ◽  
pp. 30-39
Keyword(s):  
Contact Area ◽  
Traction Force ◽  
Sliding Speed ◽  
Pneumatic Tire

Parameter Study of Offset Press Cylinder Based on Sliding Friction

2010 ◽  
Vol 174 ◽  
pp. 299-302 ◽  
Author(s):  
Hai Yan Zhang ◽  
He Ping Hou ◽  
Jun Feng Si ◽  
Xiao Yu Chen
Keyword(s):  
Contact Area ◽  
Sliding Friction ◽  
Accurate Determination ◽  
Rolling Process ◽  
Elastic Cylinder ◽  
Parameter Study ◽  
Cylinder Radius ◽  
Printing Quality ◽  
Dot Gain

In the contact area of offset, a relative slide occurs between the surface of plate cylinder and blanket cylinder, which changes the print image and influences the printing quality. The relative slide in the cylinders’ rolling process is investigated, and the determination rule of cylinders’ geometric parameters of offset press is proposed. The results show that the relative slide is minimization under the condition that the compression of elastic cylinder radius is 0.2 times bigger than that of rigid cylinder radius, and the deformation of print image and dot gain both are minimization. The results provide theoretical direction for accurate determination of cylinder radius of offset press.

Instrumented indentation microscope applied to the elastoplastic indentation contact mechanics of coating/substrate composites

2009 ◽  
Vol 24 (6) ◽  
pp. 1950-1959 ◽  
Author(s):  
N. Hakiri ◽  
A. Matsuda ◽  
M. Sakai
Keyword(s):  
Contact Area ◽  
Film Coating ◽  
Instrumented Indentation ◽  
Thin Film Coating ◽  
Composite Systems ◽  
Indentation Tests ◽  
Film Substrate ◽  
Contact Parameters

In instrumented indentation tests for a thin film coating on a substrate (film/substrate composite), it is well known that the substrate-affected contact area estimated through conventional approximations includes significant uncertainties, leading to a crucial difficulty in determining the elastic modulus and the contact hardness. To overcome this difficulty, an instrumented indentation microscope that enables researchers to make an in situ determination of the contact area is applied to an elastoplastic film on substrates having various values of their elastic moduli. Using the indentation microscope, the substrate-affected indentation contact parameters including contact hardness of the film/substrate composites are determined directly as well as quantitatively without any undesirable assumptions and approximations associated with the contact area estimate. The effect of a stiffer substrate on the contact profile of impression is significant, switching the profile from sinking in to piling up during penetration, and resulting in the substrate-affected contact hardness being highly enhanced at deeper penetrations. Through the present experimental study, it is demonstrated how efficient that instrumented indentation microscopy is in determining the substrate-affected elastoplastic contact parameters of film/substrate composite systems.

Determination of the Interference Geometry Between Two Convex Objects

2006 ◽  
Author(s):  
Lianzhen Luo ◽  
Meyer Nahon
Keyword(s):  
Contact Force ◽  
Contact Area ◽  
Contact Dynamics ◽  
Continuous Contact ◽  
Application Point ◽  
Haptic Interactions ◽  
Fitting Method ◽  
Best Fitting ◽  
Arbitrary Objects

The determination of the interference geometry between two arbitrary objects is an essential problem encountered in the simulation of continuous contact dynamics and haptic interactions. In these applications, with known material properties, the interbody contact force is only a function of the interference geometry between two objects. Here a theoretical basis and algorithms for the calculation of the interference geometry, such as overlap region, contact area and normal, and interference volume, are presented. Two methods to obtain the contact area and normal are analyzed: an area-weighted method and a best-fitting method. The geometric properties of the area-weighted method are presented and the degenerate cases related to both methods are discussed. Methods to calculate the application point of an interbody contact force are discussed. Some numerical simulation results are presented based on the implementation of the geometric algorithms, which are verified by comparison with hand calculation. The continuity of contact normal and its application point are demonstrated for a case in which the contacting objects smoothly move with respect to each other in the simulation.

Adaptable Robots Based on Linkage Type Mechanisms for Pipeline Inspection Task

2015 ◽  
Vol 762 ◽  
pp. 163-168 ◽  
Author(s):  
Mihai Olimpiu Tătar ◽  
Ioan Ardelean ◽  
Dan Mândru
Keyword(s):  
Traction Force ◽  
Digital Measuring ◽  
Pipe Inspection ◽  
Measuring Device ◽  
Maintenance And Repair ◽  
Pipeline Inspection ◽  
Inspection Robot ◽  
Complete Inspection ◽  
Inspection Task

Inspection and exploration represent a challenging domain in the field of robotics because of the hazardous and limited workspace to which the robots have to adapt and because of the reduced ability to monitor and acquire data about the inspected environment. A pipeline inspection robot must ensure sufficient traction force to pull its tether cable and other equipment while travelling inside a pipeline to complete inspection, maintenance, and repair tasks. This paper presents the design of three minirobots with adaptable structure for in pipe inspection and the experimental determination of their traction force. To measure the traction force of the minirobots, the Xplorer GLX digital measuring device was used.

Novel Application of X-ray Computed Tomography:  Determination of Gas/Liquid Contact Area and Liquid Holdup in Structured Packing

2007 ◽  
Vol 46 (17) ◽  
pp. 5734-5753 ◽  
Author(s):  
Christian W. Green ◽  
John Farone ◽  
Julie K. Briley ◽  
R. Bruce Eldridge ◽  
Richard A. Ketcham ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contact Area ◽  
Liquid Holdup ◽  
Structured Packing ◽  
X Ray ◽  
X Ray Computed

Determination of the nano-scaled contact area of staphylococcal cells

Nanoscale ◽  
2017 ◽  
Vol 9 (28) ◽  
pp. 10084-10093 ◽  
Author(s):  
Christian Spengler ◽  
Nicolas Thewes ◽  
Philipp Jung ◽  
Markus Bischoff ◽  
Karin Jacobs
Keyword(s):  
Contact Area ◽  
Adhesion Force ◽  
Bacterial Species ◽  
The Individual

A change in wettability on a surface provokes for many Staphylococci a drastic difference in adhesion force that in this study enables the determination of the bacterial contact area. This area differs from cell to cell in one bacterial species and is not correlated with the individual adhesion force.

Probabilistic Analysis of Local Ice Pressures

1993 ◽  
Vol 115 (1) ◽  
pp. 83-89 ◽  
Author(s):  
I. J. Jordaan ◽  
M. A. Maes ◽  
P. W. Brown ◽  
I. P. Hermans
Keyword(s):  
Contact Area ◽  
Probabilistic Analysis ◽  
Exceedance Probability ◽  
Analysis Method ◽  
Expected Number ◽  
Ice Loads ◽  
Probability Plots ◽  
Nominal Contact Area ◽  
Exposure Length

Extensive work in recent years has been carried out on the calculation of global ice loads on a probabilistic basis. An analysis method is presented for local ice pressures, which yields values of pressure for specific values of exceedance probability. In developing this method, particular attention has been paid to problems of exposure (length, position and number of impacts), as well as the area of exposure (area within area versus nominal contact area). The solution has been formulated for a series of discrete impacts, e.g., rams by a vessel, or a series of periods of continuous interactions. Data for the MV CANMAR Kigoriak and USCGC Polar Sea were ranked and curves were fitted through the tail of probability plots for three panel sizes. This allowed determination of exceedance probabilities of the design coefficients for pressure as a function of area. The method developed was then applied to an example for a ship based on the data and expected number of rams per year. Formulas useful in the design of structures in ice are presented.

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