DEM Simulation on the Startup Dynamic Process of a Plain Journal Bearing Lubricated by Granular Media

2014 ◽  
Vol 57 (2) ◽  
pp. 198-205 ◽  
Author(s):  
Wei Wang ◽  
Wei Gu ◽  
Kun Liu ◽  
Fei Wang ◽  
Zhanqi Tang
Keyword(s):  
Dynamic Process ◽  
Granular Media ◽  
Journal Bearing ◽  
Dem Simulation

scholarly journals Methodology for Increasing the Efficiency of Dynamic Process Calculations in Elastic Elements of Complex Engineering Constructions

Electronics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 40
Author(s):  
Andriy Andrukhiv ◽  
Maria Sokil ◽  
Solomiia Fedushko ◽  
Yuriy Syerov ◽  
Yaryna Kalambet ◽  
...  
Keyword(s):  
Dynamic Process ◽  
Granular Media ◽  
Homogeneous Medium ◽  
Dynamic Processes ◽  
Analytical Relationship ◽  
Operational Parameters ◽  
Protective Capacity ◽  
Vibration Displacement ◽  
Complex Engineering ◽  
Elastic Elements

This study deals with a methodology for increasing the efficiency of dynamic process calculations in elastic elements of complex engineering constructions. We studied the complex dynamic processes in a simple engineering construction, a mechanical system of an elastic body–continuous flow of homogeneous medium. The developed methodology is based on the use of a priori information on some of the vibrations forms, the construction of a “simplified” mathematical model of system dynamics, and the obtaining of an analytical relationship that describe the overall range of factors on the elastic vibrations of system. The methodology is used for cases of complex vibrations of elastic bodies, and the obtained results can serve as a basis for choosing the main technological and operational parameters of elastic elements of mechanisms and machines that perform complex vibrations. The results obtained in this work are the basis for calculating the blast effect on the elements of protective structures in order to increase their protective capacity by improving the method of their attachment or by using additional reinforcement, buff load effects on the elements of drilling strings and dynamic processes that occur during surface strengthening by work hardening in order to avoid resonance phenomena, and technological processes of vibration displacement or vibration separation of granular media.

Projectile oblique impact on granular media: penetration depth and dynamic process

2021 ◽  
Vol 23 (2) ◽  
Author(s):  
Xiaoyan Ye ◽  
Dengming Wang ◽  
Xingyi Zhang ◽  
Chaofeng Zhang ◽  
Wei Du ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Dynamic Process ◽  
Granular Media ◽  
Oblique Impact

304 DEM Simulation of Impact Cratering in Granular Media

2007 ◽  
Vol 2007.56 (0) ◽  
pp. 123-124
Author(s):  
Masahiro Nishida ◽  
Koichi Tanaka ◽  
Makoto Okumura
Keyword(s):  
Granular Media ◽  
Impact Cratering ◽  
Dem Simulation

DEM Simulation of the Granular Compaction Process

2002 ◽  
Author(s):  
Yong Sheng ◽  
C. J. Lawrence ◽  
B. J. Briscoe
Keyword(s):  
Granular Media ◽  
Mechanical Response ◽  
Contact Friction ◽  
Surface Adhesion ◽  
Compaction Process ◽  
Dem Simulation ◽  
Particle Properties ◽  
Granular Compaction ◽  
Continuum Description ◽  
Macroscopic Continuum

In this paper, the discrete element method is employed to simulate the powder compaction process and to produce the detailed results of micro mechanical response in particle scale. The DEM program is capable to calculate the contact between particles considering of surface adhesion, The statistical average properties of the compacts are then obtained from the sum of the particle movements and contacts. The calculated results show that the variation of the particle properties such as contact friction and elastic-plastic contact criteria can significantly affect the bulk response of the assembly. The connection between micro properties of particles and macroscopic continuum description of the behaviour of granular media is then discussed.

DEM Simulation of Particle Damage in Granular Media — Structure Interfaces

2001 ◽  
Vol 1 (1) ◽  
pp. 21-39 ◽  
Author(s):  
Richard P. Jensen ◽  
Michael E. Plesha ◽  
Tuncer B. Edil ◽  
Peter J. Bosscher ◽  
Nabil Ben Kahla
Keyword(s):  
Granular Media ◽  
Dem Simulation ◽  
Particle Damage

Red Flags: Barriers to Listening and Spoken Language in Children with Hearing Loss

2014 ◽  
Vol 24 (1) ◽  
pp. 11-18
Author(s):  
Andrea Bell ◽  
K. Todd Houston
Keyword(s):  
Hearing Loss ◽  
Early Diagnosis ◽  
Skill Acquisition ◽  
Dynamic Process ◽  
Spoken Language ◽  
Red Flags ◽  
Careful Monitoring ◽  
Auditory Development ◽  
Children With Hearing Loss ◽  
Family Centered

To ensure optimal auditory development for the acquisition of spoken language, children with hearing loss require early diagnosis, effective ongoing audiological management, well fit and maintained hearing technology, and appropriate family-centered early intervention. When these elements are in place, children with hearing loss can achieve developmental and communicative outcomes that are comparable to their hearing peers. However, for these outcomes to occur, clinicians—early interventionists, speech-language pathologists, and pediatric audiologists—must participate in a dynamic process that requires careful monitoring of countless variables that could impact the child's skill acquisition. This paper addresses some of these variables or “red flags,” which often are indicators of both minor and major issues that clinicians may encounter when delivering services to young children with hearing loss and their families.

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