Dynamics Analysis in Rigid-Flexible Coupling of Reinforced Steel Length Bodies with Friction Wheel

2013 ◽  
Vol 744 ◽  
pp. 165-168
Author(s):  
Jun Sun ◽  
Jun Qing Chen ◽  
Ling Lu ◽  
Peng Huang
Keyword(s):  
Simulation Analysis ◽  
Structure Optimization ◽  
Contact Friction ◽  
Flexible Body ◽  
Operating Parameters ◽  
Dynamics Analysis ◽  
Flexible Coupling ◽  
Reinforced Steel ◽  
Engineering Significance

This thesis studies how reinforced steel completes digital length design after being straightened.In general,the analysis of kinematic and dynamic to reinforced steel does not be considered the role of the flexible components in institutional kinematic. The program regards reinforced steel as a flexible body and sees friction wheel as rigid body. The contact between friction wheel and steel is the rigid-flexible coupling[3].With the simulation analysis in ADAMS,I research the problem that reinforced steel produces the slide or not in different speed and contact friction coefficient, in order to determine the design and operating parameters of the cut-to-length body and ensure the accuracy. The result has a good engineering significance in the design of the length structure optimization and operating parameters [4].

Dynamic Characteristics of Five-Axis CNC Machine Tools

2013 ◽  
Vol 385-386 ◽  
pp. 743-746 ◽  
Author(s):  
Wei Ping Luo ◽  
Ting Ting Chen
Keyword(s):  
Machine Tools ◽  
Theoretical Basis ◽  
Simulation Analysis ◽  
Structure Optimization ◽  
Coupling Model ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Flexible Coupling ◽  
Main Components ◽  
Five Axis

According to the five-axis CNC machine tools, the main components are put to flexible and a rigid-flexible virtual prototype has been established. The influence on the machine tool stability is analyzed. The reliable theoretical basis has been provided for the structure optimization. Results are shown that simulation analysis based on a rigid-flexible coupling model is more accurate to show dynamics characteristics of machine tools.

Numerical Simulation on the Effect of Compound Roof Separation Position on Bolting Performance

2014 ◽  
Vol 953-954 ◽  
pp. 1638-1642
Author(s):  
Ai Qing Liu ◽  
Jian Zhang ◽  
Peng Cheng ◽  
Yu Hai Zhang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Surrounding Rock ◽  
Cohesive Force ◽  
Roof Strata ◽  
Poor Stability ◽  
Key Parameter

Prestress is a key parameter in bolting, while the cohesive force of layers in the compound roof strata is low and prone to separation, causing the prestress proliferation very poor. With the method of numerical simulation analysis,the location of separation in compound roof to affect the performance of bolting support was researched. It is concluded the roof separation in the edge of anchorage zone, the prestress field superpose, but is away from the deep surrounding rock and shows poor stability,however the role of cable can make up for the defect of rockbolts support. It has been found the highly prestressed strength bolting system adapts to the compound roof.

scholarly journals Modeling and Parameter Optimization of Dynamic Characteristic Variables of Ballast Bed during Operation for Dynamic Track Stabilizer

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Bo Yan ◽  
Jingjing Yang
Keyword(s):  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Traffic Density ◽  
Operating Parameters ◽  
Simulation Accuracy ◽  
Railway Line ◽  
Coupling System ◽  
Track System ◽  
Parameterized Model ◽  
Railway Maintenance

The high traffic density of railway line causes ballasted track to be extremely busy, and thus it is particularly important to improve the efficiency during railway maintenance. The changing law of dynamic characteristics of ballast bed during operation for the dynamic track stabilizer is conducive to optimize simulation analysis of the vehicle-track system, so as to provide an optimized choice of operating parameters for promoting the pertinence and efficiency of dynamic track stabilizer. This paper presents the acceleration response of vehicle-track-subgrade system during operation of a WD-320 dynamic track stabilizer and proposes the range of effective operating parameters. Then, the influence of operating parameters on the dynamic characteristics of the ballast bed is discussed for searching the optimal operating parameters under the single factor influence. Finally, the change laws including the support stiffness, damping, lateral resistance, and subsidence for the ballast bed are studied, and a parameterized model for dynamic characteristics of the ballast bed which can optimize the selection for operating parameters is constructed, rendering an effective reference variable for improving the simulation accuracy of the vehicle-track coupling system.

Knowledge-Based Externalities and Geographical Clusters

2014 ◽  
pp. 269-286 ◽  
Author(s):  
Nunzia Carbonara
Keyword(s):  
Simulation Analysis ◽  
Geographic Area ◽  
Agglomeration Economies ◽  
Agent Based ◽  
Knowledge Based ◽  
Pecuniary Externalities ◽  
Positive Externalities ◽  
Geographical Cluster ◽  
Geographical Clustering

Agglomeration economies are positive externalities associated with the co-location of firms within a bounded geographic area. Traditionally, these agglomerative advantages have been expressed in terms of pecuniary externalities and they have been identified as one of the key sources of geographical cluster (GC) competitive advantage. However, in the last years the basics of competition are changed and the ability of firms to create new knowledge is more crucial for success rather than the efficiency in production. This has shifted the attention of scholars on the role of knowledge and learning in GCs. In line with these studies, this chapter suggests that agglomeration economies are related to both pecuniary externalities and knowledge-based externalities. The latter are benefits that co-located firms can gain in terms of development of knowledge. To investigate whether knowledge-based externalities affect geographical clustering of firms, an agent-based model is developed. By using this model, a simulation analysis is carried out.

Knowledge-Driven Agglomeration Processes

2016 ◽  
pp. 373-396
Author(s):  
Nunzia Carbonara
Keyword(s):  
Economic Geography ◽  
Simulation Analysis ◽  
Geographic Area ◽  
Agglomeration Economies ◽  
Agent Based ◽  
Knowledge Based ◽  
Pecuniary Externalities ◽  
Positive Externalities ◽  
Geographical Clusters

According to the economic geography literature, firms tend to geographically cluster when agglomeration economies exist. These are positive externalities associated with the co-location of firms within a bounded geographic area. Traditionally, the agglomerative advantages have been expressed in terms of pecuniary externalities and they have been identified as one of the key sources of the geographical clusters' competitive advantage. However, in the last years the basics of competition are changed and the ability of firms to create new knowledge is more crucial for success rather than the efficiency in production. This has shifted the attention of scholars on the role of knowledge and learning for the competitiveness and success of geographical clusters. In line with these studies, the chapter suggests that agglomeration economies are related to both pecuniary externalities and knowledge-based externalities. The latter are benefits that co-located firms can gain in terms of development of knowledge. To investigate whether knowledge-based externalities affect geographical clustering of firms, an agent-based model is developed. By using this model, a simulation analysis is carried out.

scholarly journals Role of Hair Coverage and Sweating for Textile Friction on the Forearm

2020 ◽  
Vol 68 (4) ◽  
Author(s):  
Jingchun Lyu ◽  
Novaf Özgün ◽  
David J. Kondziela ◽  
Roland Bennewitz
Keyword(s):  
Physical Activity ◽  
Image Analysis ◽  
Contact Friction ◽  
Loading Conditions ◽  
Human Forearm ◽  
Study Participants ◽  
Hair Coverage ◽  
Skin Moisture

AbstractFriction of textiles on the human forearm is an important factor in comfort sensations of garments. We built an experiment to measure friction for textiles sliding on the forearm under loading conditions which are characteristic for wearing shirts or jackets. The hair coverage of the participants’ forearm was quantified by image analysis of photographs of the arm in the region of contact. Friction results for five standard textiles suggest to treat hair coverage in two classes. Sweating after physical activity leads to an increase of friction by factors of 2 to 5 for participants with less hairy forearms, while an increase by a factor of 1 to 1.7 only was found for participants with more hairy forearms. We introduce a method of wetting the forearm of study participants in a controlled way with water, which results in similar friction as for the sweating forearm after physical activity. The method allows for efficient studies of the role of skin moisture for friction including varying hair coverage of the skin.

Effects of Electron-ion Recombination on Contrast in ESEM Images

2001 ◽  
Vol 7 (S2) ◽  
pp. 794-795
Author(s):  
M. Toth ◽  
B. L. Thiel ◽  
A. M. Donald
Keyword(s):  
Secondary Electron ◽  
Image Formation ◽  
Environmental Scanning ◽  
Operating Parameters ◽  
Ion Recombination ◽  
Conventional Models ◽  
Working Distance ◽  
Present Experimental Evidence ◽  
Scanning Electron

We present experimental evidence for the effects of electron-ion recombination on contrast formation in secondary electron (SE) images obtained using an environmental scanning electron microscope (ESEM). Inclusion of the effects of SE-ion recombination in the theory of ESEM image formation accounts for contrast reversal observed, under appropriate conditions, in SE images of conductors (ie, in the absence of localized specimen charging) and of insulators that exhibit localized charging. Previously unexplained dynamic contrast caused by temporal charging can be understood if both conventional models of the effects of charging on SE emission, and the proposed role of SEion recombination in ESEM image formation are accounted for.In an ESEM, the extent of charging exhibited by insulating specimens can be controlled by varying the type and pressure (P) of the imaging gas, and operating parameters that determine the extent to which the gas is ionized (eg, detector bias, VGSED, and working distance, WD).

Comparative antiradical activity and molecular Docking/Dynamics analysis of octopamine and norepinephrine: the role of OH groups

2020 ◽  
Vol 84 ◽  
pp. 107170 ◽  
Author(s):  
Dušan Dimić ◽  
Žiko Milanović ◽  
Goran Jovanović ◽  
Dragana Sretenović ◽  
Dejan Milenković ◽  
...  
Keyword(s):  
Molecular Docking ◽  
Antiradical Activity ◽  
Dynamics Analysis ◽  
Oh Groups

Research on Dynamics Simulation of Buffering Process of Docking Mechanism

2014 ◽  
Vol 701-702 ◽  
pp. 748-752
Author(s):  
Yuan Zhang ◽  
Li Li Zhou ◽  
Jian Wang ◽  
Chang Zhen Fan
Keyword(s):  
Mathematical Modeling ◽  
Dynamic Simulation ◽  
Simulation Analysis ◽  
Structure Optimization ◽  
Working Life ◽  
Dynamics Simulation ◽  
Buffer System ◽  
Factors Influencing ◽  
Docking Mechanism ◽  
Important Basis

On-orbit service technology can extend the working life of the spacecraft, and improve the ability to perform various tasks. Docking mechanism is the key equipment of the space docking. The cushion performance of the system determines the dynamic characteristics in the docking process, and it is one of the important factors influencing the docking success or not. It is established that mathematical modeling of the new grasping mechanism in the buffering process, due to lack of the experiment equipments, the dynamic simulation on computer is an effective method to test and verify the parameters or evaluate the performance of the buffer system designed. Simulation analysis is conducted to get the corresponding buffer force for four different sets of buffer parameter, and it provides important basis for docking cushioning structure optimization.

Roughness-Induced Shear- and Squeeze-Film Effects in Magnetic Recording—Part I: Analysis

1989 ◽  
Vol 111 (2) ◽  
pp. 220-227 ◽  
Author(s):  
Bharat Bhushan ◽  
Kristian To̸nder
Keyword(s):  
Magnetic Recording ◽  
Design Guidelines ◽  
Squeeze Film ◽  
Operating Parameters ◽  
Periodic Motions ◽  
Average Flow ◽  
Thickness Standard ◽  
Orientation Parameters ◽  
Rarefaction Effects

General analyses are developed to predict the role of surface roughness, rarefaction effects, and various operating parameters in thin-film gas lubrication. Both shear- and squeeze-film effects are considered. The squeeze-film analysis is developed for transient and periodic motions. The analyses are based on average flow (roughness) factors. The results are presented in terms of Knudsen number, h/σ (film thickness/standard deviations of composite roughness) and roughness-orientation parameters. The appropriate analyses presented in this paper are simple and can be applied to magnetic recording and other applications to provide design guidelines.

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