Static load distribution analysis of ball screws with nut position variation

2020 ◽  
Vol 151 ◽  
pp. 103893 ◽  
Author(s):  
Chang Liu ◽  
Chunyu Zhao ◽  
Xianli Meng ◽  
Bangchun Wen
Keyword(s):  
Load Distribution ◽  
Static Load ◽  
Distribution Analysis

scholarly journals Comparison of Numerical Analyses with a Static Load Test of a Continuous Flight Auger Pile

2014 ◽  
Vol 22 (4) ◽  
pp. 1-10 ◽  
Author(s):  
Michal Hoľko ◽  
Jakub Stacho
Keyword(s):  
Load Distribution ◽  
Static Load ◽  
Numerical Models ◽  
Load Test ◽  
Numerical Analyses ◽  
Static Load Test ◽  
Material Models ◽  
The Common ◽  
Constitutive Material ◽  
The Impact

Abstract The article deals with numerical analyses of a Continuous Flight Auger (CFA) pile. The analyses include a comparison of calculated and measured load-settlement curves as well as a comparison of the load distribution over a pile's length. The numerical analyses were executed using two types of software, i.e., Ansys and Plaxis, which are based on FEM calculations. Both types of software are different from each other in the way they create numerical models, model the interface between the pile and soil, and use constitutive material models. The analyses have been prepared in the form of a parametric study, where the method of modelling the interface and the material models of the soil are compared and analysed. Our analyses show that both types of software permit the modelling of pile foundations. The Plaxis software uses advanced material models as well as the modelling of the impact of groundwater or overconsolidation. The load-settlement curve calculated using Plaxis is equal to the results of a static load test with a more than 95 % degree of accuracy. In comparison, the load-settlement curve calculated using Ansys allows for the obtaining of only an approximate estimate, but the software allows for the common modelling of large structure systems together with a foundation system.

An improved 2D finite element model for bolt load distribution analysis of composite multi-bolt single-lap joints

2020 ◽  
Vol 253 ◽  
pp. 112770
Author(s):  
Fengrui Liu ◽  
Wanting Yao ◽  
Libin Zhao ◽  
Hao Wu ◽  
Xi Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Load Distribution ◽  
Element Model ◽  
Lap Joints ◽  
Distribution Analysis ◽  
Single Lap Joints

scholarly journals Influence of the CO2 emission factor value on the result of the load distribution analysis between the hybrid PV/WT/FC system and the electric power system

2019 ◽  
Vol 108 ◽  
pp. 01016 ◽  
Author(s):  
Bartosz Ceran
Keyword(s):  
Power Systems ◽  
Load Distribution ◽  
Manufacturing Sector ◽  
Multicriteria Analysis ◽  
Electric Power System ◽  
Distribution Analysis ◽  
Generation System ◽  
Hybrid Power ◽  
Electricity System ◽  
Power Generation System

This article presents the results of the multicriteria analysis of loads distribution between hybrid power generation system consisting of PV/WT/FC and the electricity system. The simulations were performed for power systems with different structures of the manufacturing sector, and so with different values of the factor of CO2 emission. A decision-making criteria, which were used to compare the relevant scenarios, have been defined.

Low Order Static Load Distribution Model for Ball Screw Mechanisms Including Effects of Lateral Deformation and Geometric Errors

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Bo Lin ◽  
Chinedum E. Okwudire ◽  
Jason S. Wou
Keyword(s):  
Load Distribution ◽  
Static Load ◽  
High Order ◽  
Contact Model ◽  
Ball Screw ◽  
Distribution Model ◽  
Computational Time ◽  
Geometric Errors ◽  
Lateral Deformation ◽  
Low Order

Accurate modeling of static load distribution of balls is very useful for proper design and sizing of ball screw mechanisms (BSMs); it is also a starting point in modeling the dynamics, e.g., friction behavior, of BSMs. Often, it is preferable to determine load distribution using low order models, as opposed to computationally unwieldy high order finite element (FE) models. However, existing low order static load distribution models for BSMs are inaccurate because they ignore the lateral (bending) deformations of screw/nut and do not adequately consider geometric errors, both of which significantly influence load distribution. This paper presents a low order static load distribution model for BSMs that incorporates lateral deformation and geometric error effects. The ball and groove surfaces of BSMs, including geometric errors, are described mathematically and used to establish a ball-to-groove contact model based on Hertzian contact theory. Effects of axial, torsional, and lateral deformations are incorporated into the contact model by representing the nut as a rigid body and the screw as beam FEs connected by a newly derived ball stiffness matrix which considers geometric errors. Benchmarked against a high order FE model in case studies, the proposed model is shown to be accurate in predicting static load distribution, while requiring much less computational time. Its ease-of-use and versatility for evaluating effects of sundry geometric errors, e.g., pitch errors and ball diameter variation, on static load distribution are also demonstrated. It is thus suitable for parametric studies and optimal design of BSMs.

A Method to Determine the Static Load Distribution in a Chain Drive

1999 ◽  
Vol 121 (3) ◽  
pp. 402-408 ◽  
Author(s):  
I. Troedsson ◽  
L. Vedmar
Keyword(s):  
Elastic Deformation ◽  
Load Distribution ◽  
Gravitational Force ◽  
Static Load ◽  
Chain Drive ◽  
Standard Geometry ◽  
A Chain ◽  
Force Equilibrium

A model of how to calculate the load distribution for a chain drive is presented. In the model the complete standard geometry is used without any assumptions. The rollers which are in contact with the sprockets can move freely along the tooth flanks and their positions are given by force equilibrium. Since the positions of the rollers and thereby also the load distribution are dependent on the two connecting spans, these necessary tight and slack spans have been included in the model. The elastic deformation in the chain is included as well as the gravitational force.

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