Dynamics of Multiple-Drive Belt Conveyors during Starting

2016 ◽  
Vol 842 ◽  
pp. 141-146
Author(s):  
Indraswari Kusumaningtyas ◽  
Ashley J.G. Nuttall ◽  
Gabriel Lodewijks
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Elastic Response ◽  
Belt Conveyor ◽  
Conveyor System ◽  
Start Up ◽  
Drive Belt ◽  
Stationary Conditions ◽  
Belt Conveyors

In this paper, the dynamics of multiple-drive belt conveyors during starting is discussed. The aim of the research is to determine whether the belt sections in a multiple-drive belt conveyor can be viewed as a single-drive belt conveyor, and whether the DIN 22101 standard for the starting of a single-drive belt conveyor can still be used for the starting of a multiple-drive belt conveyor. A finite element model of a belt conveyor system was built in Matlab, consisting of a model of the belt and its support structure, and a model of the drive system. In this work, the simulations were carried out for the starting procedures of empty belt conveyors with varying number of drives. For each simulation case, the linear start-up procedure was tested. The simulations focused on the study of the axial elastic response of the belt. The simulations revealed that, by using more drives, the maximum belt stress during non-stationary as well as stationary conditions decreased. However, when using reduced starting times, negative stresses occur in the system. Overall, it was observed that the behaviour of each section between two drive stations in the multiple-drive belt conveyor differed from those of the single-drive belt conveyor. Therefore, the DIN 22101 guidelines for the start-up of a single-drive belt conveyor cannot be applied directly for the start-up of a multiple-drive belt conveyor.

Deformation Index–Based Modeling of Transient, Thermo-mechanical Rolling Resistance for a Nonpneumatic Tire

2013 ◽  
Vol 41 (2) ◽  
pp. 82-108 ◽  
Author(s):  
James M. Gibert ◽  
Balajee Ananthasayanam ◽  
Paul F. Joseph ◽  
Timothy B. Rhyne ◽  
Steven M. Cron
Keyword(s):  
Finite Element ◽  
Steady State ◽  
Finite Element Model ◽  
Rolling Resistance ◽  
Element Model ◽  
Lumped Parameter Model ◽  
Structural Deformation ◽  
Elastic Response ◽  
Full Potential ◽  
Deformation Index

ABSTRACT When competing in performance with their pneumatic counterparts, nonpneumatic tires should have several critical features, such as low energy loss when rolling over obstacles, low mass, low stiffness, and low contact pressure. In recent years, a nonpneumatic tire design was proposed to address each of these critical issues [1]. In this study, the steady state and transient energy losses due to rolling resistance for the proposed nonpneumatic tire are considered. Typically, such an analysis is complex because of the coupling of temperature on the structural deformation and the viscoelastic energy dissipation, which requires an iterative procedure. However, researchers have proposed a simplified analysis by using the sensitivity of the tire's elastic response to changes in material stiffness through a deformation index [2–4]. In the current study, the method is exploited to its full potential for the nonpneumatic tire due to the relatively simple nature of deformation in the tire's flexible ring and the lack of several complicating features present in pneumatic tires, namely, a heated air cavity and the complex stress state due to its composite structure. In this article, two models were developed to predict the transient and steady-state temperature rise. The first is a finite element model based on the deformation index approach, which can account for thermo-mechanical details in the tire. Motivated by the simplicity of the thermo-behavior predicted by this finite element model, a simple lumped parameter model for temperature prediction at the center of the shear band was developed, which in many cases compares very well with the more detailed finite element approach due to the nature of the nonpneumatic tire. The finite element model can be used to, for example, explore the design space of the nonpneumatic tire to reach target temperatures by modifying heat transfer coefficients and/or material properties.

Modeling and experimental analysis of the hyperelastic thin film nitinol

2011 ◽  
Vol 22 (17) ◽  
pp. 2045-2051 ◽  
Author(s):  
Youngjae Chun ◽  
Po-Yu Lin ◽  
Hsin-Yun Chang ◽  
Michael C. Emmons ◽  
K.P. Mohanchandra ◽  
...  
Keyword(s):  
Thin Film ◽  
Finite Element ◽  
Finite Element Model ◽  
Large Deformation ◽  
Experimental Analysis ◽  
Electronic Devices ◽  
Element Model ◽  
Elastic Response ◽  
Geometric Factors ◽  
Parametric Studies

Many flexible electronic devices or endovascular biomedical devices require large deformation; however, potential materials produce limited elastic response, that is, 10% when 400% is required. In this article, a finite element model is used to design a hyperelastic thin film nitinol structure containing geometric fenestrations. The hyperelastic response is dependent upon geometric factors that produce buckling. Parametric studies provide the influence-specific parameters have on buckling load. These results are used to select three designs to manufacture and test. Experimental results indicate that elongations greater than 700% are possible.

Effect of Steam Turbine Rotor Notch Fillet Radius on Stress and Deformation

2013 ◽  
Vol 860-863 ◽  
pp. 1770-1781
Author(s):  
Dong Mei Ji ◽  
M. H. Herman Shen ◽  
Shi Hua Yang ◽  
Gang Xia
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Finite Element Model ◽  
Steam Turbine ◽  
Element Model ◽  
Turbine Rotor ◽  
Critical Value ◽  
Steam Turbine Rotor ◽  
Fillet Radius ◽  
Start Up

A thorough investigation on the effect of a 320MW steam turbine rotor notch fillet radius on thermal and mechanical stresses during start up is presented. The approach consists of a shape design and analysis procedure which incorporates a finite element model. The finite element model is used to characterize the radius of the rotor notch fillet for ensuring the designed thermal and mechanical stress state/pattern and associated deflection during start-up. The results indicate that the notch fillet radius r has significant impact on the total stress of the rotor, in particular on thermal stress. It is determined that the thermal stress is decreased as the notch fillet radius r increases to a critical value. However, the thermal stress becomes saturated as the radius is increased to values larger than the critical value. The results also indicate that the rotor notch fillet radius has little effect on the deflection of the rotor during start-up. This investigation could be very useful to designers for construction of the design guidelines for steam turbine rotors.

scholarly journals Dynamic Design and Computer Imitation of Belt Conveyor with Horizontal Curves

2011 ◽  
Vol 2-3 ◽  
pp. 833-837
Author(s):  
Dan Wang ◽  
Wei Gang Song ◽  
Jie Liu
Keyword(s):  
Element Model ◽  
Belt Conveyor ◽  
Real Time System ◽  
Dynamic Design ◽  
Horizontal Curves ◽  
Start Up ◽  
Belt Conveyors ◽  
Braking Process ◽  
Discrete Finite Element ◽  
Computer Imitation

The dynamic design of a large belt conveyor with horizontal curves was studied in this paper. The method of calculating its running resistance was obtained by analyzing the orienting force and resistance on the curving parts of the belt conveyors. Dynamic equation of belt conveyor with horizontal curves by using discrete finite element model was established integrating the line-running parts and the curve-running parts. Additionally, dynamic analysis software of belt conveyor with horizontal curves was developed. Through simulation on real time system, start-up process and braking process were analyzed. The deviation of the belt was analyzed based on the tension, and the effect of curve running on belt conveyor was discussed.

scholarly journals Safety Characteristic Evaluation of Cage in Cylindrical Roller Bearing at the Stage of Start-Up and Stop

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Zhang Wenhu ◽  
Wu Zhimin ◽  
Deng Sier ◽  
Zhang Song ◽  
Tian Heng ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Parameters ◽  
Roller Bearing ◽  
Element Model ◽  
Main Shaft ◽  
Start Up ◽  
Cylindrical Roller Bearing ◽  
Safety Characteristic ◽  
Cylindrical Roller

The dynamics model of cylindrical roller bearing (CRB) in aeroengine main shaft was promoted and solved by Hilber–Hughes–Taylor (HHT) integer algorithm with variable step in combination with symmetric multiprocessing (SMP) parallel solving technology, and a finite element model of roller to cage contact was built. The dynamic characteristics of CRB at the stage of start-up and stop were analyzed firstly, and then, the collision forces between rollers and cage were used as the boundary conditions of the finite element model to discuss the influences of working conditions, structural parameters, and materials on the stress distribution and safety characteristic of cage at the stage of start-up and stop. The findings will provide the theoretical basis for the designing of CRB in aeroengine main shaft.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

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