Modal Methods for Contact Analysis and Contact Force Reconstruction

2017 ◽  
pp. 185-191
Author(s):  
Daniel J. Segalman ◽  
Brian F. Feeny
Keyword(s):  
Contact Force ◽  
Contact Analysis ◽  
Force Reconstruction

CONTACT FORCE RECONSTRUCTION ON VIBRATING SURFACES

2020 ◽  
Author(s):  
Jeroen Van Hauwermeiren ◽  
Katrien Van Nimmen ◽  
B. Vanwanseele ◽  
Peter Van den Broeck
Keyword(s):  
Contact Force ◽  
Force Reconstruction

Study on the Effect of Ways of Gear Relief on Contact Force of Teeth Face

2011 ◽  
Vol 415-417 ◽  
pp. 66-70
Author(s):  
Yong Ma ◽  
Qi Huang ◽  
Tian Ji ◽  
Zhi Feng Lou
Keyword(s):  
Finite Element ◽  
Contact Force ◽  
Contact Analysis ◽  
Finite Element Models ◽  
Contact Method ◽  
Helical Gears ◽  
Profile Modification ◽  
Involute Gears ◽  
Main Basis ◽  
Better Than

An accurate finite element contact analysis of helical gears was done directly under ANSYS, while the integrated elastic deformation of the meshed teeth was extracted directly from the finite element contact analysis results, and considered as the main basis of the amount of tooth profile modification. Linear, conic, cubic, and sine relief curve are compiled and established in MATLAB, on which gear models of two ways of modified gear are built. Under the same modified parameters, contact method is used on the proposed finite element models of gears by software LS-DYNA, and the effect of the two ways of gear relief on contact force on teeth face is analyzed. The results show that the effect of a pair of gears relief is better than one gear relief for linear and conic relief curve, and the effect of one gear relief is better than a pair of gears relief for cubic and sine relief curve. So dynamic simulation on modified involute gears has great significance for reducing contact force of teeth face of gears.

Impact of a Compound Pendulum With a Surface Using a Nonlinear Contact Force

2009 ◽  
Author(s):  
Eliza A. Banu ◽  
Dan Marghitu ◽  
Robert Jackson
Keyword(s):  
Contact Force ◽  
Flat Surface ◽  
Quantitative Measure ◽  
Coefficient Of Restitution ◽  
Contact Analysis ◽  
Plastic Compression ◽  
Nonlinear Contact ◽  
Angular Velocities ◽  
The Impact ◽  
Impact With Friction

The coefficient of restitution for the impact of a compound pendulum with a flat surface is an important quantitative measure in contact analysis. The impact is analyzed for different lengths of the pendulum, different angles of impact, and different initial angular velocities of the pendulum. The impact with friction is studied using an elasto plastic force developed by Jackson and Green for the three phases of impact: elastic compression, elasto-plastic compression, and elastic restitution phase.

scholarly journals Contact Force Reconstruction from the Lower-Back Accelerations during Walking on Vibrating Surfaces

Vibration ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 205-231
Author(s):  
Jeroen Van Hauwermeiren ◽  
Katrien Van Nimmen ◽  
Benedicte Vanwanseele ◽  
Peter Van den Broeck
Keyword(s):  
Contact Force ◽  
Scale Validation ◽  
Numerical Study ◽  
Low Cost ◽  
Contact Forces ◽  
Rigid Surface ◽  
Data Set ◽  
Lower Back ◽  
Reconstruction Methods ◽  
Force Reconstruction

Current models describing the effect of crowd-induced loading require a full-scale validation. To measure the lower-back accelerations during such validation, low-cost accelerometers are used to ensure a sufficient scalability. The goal is to verify to what extent the low-cost sensors can be used for the contact force reconstruction in case the pedestrian walks on a vibrating surface. First, a data set is collected comprising the simultaneous registration of the lower-back accelerations and the contact forces. Three contact force reconstruction methods are presented to accurately reconstruct the contact force in case of walking on a rigid surface. Second, the focus is on the contact force reconstruction in case of walking on a vibrating surface. A numerical study is performed adopting quantities of the Eeklo Benchmark Dataset providing a realistic framework. The additional lower-back accelerations as a result of the vibrating surface are estimated numerically. It is found that directly reconstructing the total contact force leads to inaccurate results. Instead, it is more suited to reconstruct the contact force one would induce on a rigid surface and combine this with an independent model to account for human–structure interaction. The conclusions of this numerical example are case-specific while the presented methodology is generic and can be readily extended to virtually any other structure.

Fracture Reasons and Improvements for the Running Gear of Shearers

2012 ◽  
Vol 490-495 ◽  
pp. 2733-2737
Author(s):  
Chun Yu Song ◽  
Jing Ru Liu ◽  
Xiu Juan Zhang
Keyword(s):  
Finite Element ◽  
Internal Stress ◽  
Contact Force ◽  
Maximum Stress ◽  
Contact Analysis ◽  
Finite Element Models ◽  
Elastic Contact ◽  
Gear Teeth ◽  
Calculation Results ◽  
Contact Spots

Running traction mechanism of shearers is adopted as the analysis object in this paper. The finite element models for the elastic contact analysis between the running gears and pin-rails are created. When the gears are running, the variation principles of contact spots, contact force, and internal stress for the gears and pin-rails at the different contact positions are analyzed. The calculation results show that the maximum stress is located at the edges of the gear teeth for the different contact positions. When the teeth are loaded with the repeated large stress, cracks are produced at the tooth edges at first and then are growing. The tooth breakage is produced at last. Gear chamfers using two circulars at the tooth edges can change the location of the maximum stress and the maximum MISES stress can be reduced by 20% or more. Therefore, the fracture problem of gear teeth is solved basically.

Load distribution in cylindrical roller bearing with EHD lubricated contact force

2019 ◽  
Author(s):  
Natália Akemi Hoshikawa Tsuha ◽  
Fabio Nonato ◽  
Katia Lucchesi Cavalca Dedini
Keyword(s):  
Contact Force ◽  
Load Distribution ◽  
Roller Bearing ◽  
Lubricated Contact ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

BRUSHFORM 65

Alloy Digest ◽  
2013 ◽  
Vol 62 (6) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Contact Force ◽  
Temperature Rise ◽  
Power Loss ◽  
High Reliability ◽  
Superior Performance ◽  
Contact Interface ◽  
Resistive Heating ◽  
Computer Power

Abstract BrushForm 65 is designed for both superior performance and high reliability in appliance, automotive, and computer power applications. Alloy BF-65’s combination of properties limits power loss at the contact interface, controls temperature rise from resistive heating, and provides stable contact force at temperatures to 200 C (390 F). This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on forming. Filing Code: Cu-821. Producer or source: Materion Brush Performance Alloys.

Sign in / Sign up

Export Citation Format

Share Document