scholarly journals Mechanical Modal Phenomena of a Ganged Heliostat

2017 ◽  
Author(s):  
Kenneth M. Armijo ◽  
Jesus D. Ortega ◽  
Adam Moya ◽  
Joshua Christian ◽  
Gregory Peacock ◽  
...  
Keyword(s):  
Solar Collector ◽  
Simulation Software ◽  
Small Scale ◽  
Element Analysis ◽  
Impact Performance ◽  
Modal Test ◽  
Fea Model ◽  
Cost Reductions ◽  
The Many ◽  
Good Agreement

Ganged-heliostats have the potential for large cost reductions with enhanced solar collector field optimization. Unlike typical heliostats that require dual axis tracking actuators and a base or foundation, ganged-heliostats can share actuation and a support structure. This membership greatly reduces system infrastructure and installation costs. However, concentrating solar power (CSP) heliostats are subjected to wind-induced loads, vibration, and gravity-induced deformations. These effects could impact performance and reliability of these structures, where despite the many advantages for the utility of ganged heliostats, modal limitations exist from wind perturbations. In this investigation, an introductory multiphysics finite element analysis (FEA) model was developed using SolidWorks Simulation software to validate experimental measurements of a novel small-scale ganged heliostat system, parametrically under varying azimuth rotations, facet pitch levels, and cable tension levels. The ganged heliostat design featured a number of mirrors resting on two guide wires which were tensioned and rotated to align with any given target. Experimentally, several standard modal tests were conducted on the ganged heliostat, which was designed to operate under a number of orientations, where for this investigation two scenarios were selected to be representative of an operational heliostat. The heliostat was oriented at a 0° (face up) and 45° orientations for the modal test configurations. The modal tests were computationally validated in good agreement with the experiments to within 2.8% and 6.3% error for 0° and 45° orientations respectively.

Finite Element Analysis Model of Corrosion Fatigue for TIG Welding Workpiece

2016 ◽  
Vol 707 ◽  
pp. 154-158
Author(s):  
Somsak Limwongsakorn ◽  
Wasawat Nakkiew ◽  
Adirek Baisukhan
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Corrosion Fatigue ◽  
Welding Process ◽  
Simulation Software ◽  
Tig Welding ◽  
Element Analysis ◽  
Fea Model

The proposed finite element analysis (FEA) model was constructed using FEA simulation software, ANSYS program, for determining effects of corrosion fatigue (CF) from TIG welding process on AISI 304 stainless steel workpiece. The FEA model of TIG welding process was developed from Goldak's double ellipsoid moving heat source. In this paper, the residual stress results obtained from the FEA model were consistent with results from the X-ray diffraction (XRD) method. The residual stress was further used as an input in the next step of corrosion fatigue analysis. The predictive CF life result obtained from the FEA CF model were consistent with the value obtained from stress-life curve (S-N curve) from the reference literaturature. Therefore, the proposed FEA of CF model was then used for predicting the corrosion fatigue life on TIG welding workpiece, the results from the model showed the corrosion fatigue life of 1,794 cycles with testing condition of the frequency ( f ) = 0.1 Hz and the equivalent load of 67.5 kN (equal to 150 MPa) with R = 0.25.

Prediction of Kingpin/Fifthwheel Forces for Tractor-Semitrailers During Typical Operating Maneuvers

2007 ◽  
Author(s):  
Brent Shoffner ◽  
James Allen ◽  
Moustafa El-Gindy ◽  
Wayne Evenson ◽  
Mario A. Scaglione
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Modeling And Simulation ◽  
Computer Simulations ◽  
Literature Search ◽  
Simulation Software ◽  
Element Analysis ◽  
Supporting Structure ◽  
Fea Model ◽  
Age Related

Visual inspections of selected semitrailers during routine equipment checks revealed that the kingpin bent in the direction of 180 degrees from the direction that the semitrailer is towed. Confirmation from semitrailer repair facilities found that in some cases the semitrailer’s supporting structure developed unexpected cracks. These cracks were not thought to be age related but were most likely caused by high stresses from unknown high loads. In an effort to determine the forces at the kingpin and fifthwheel, TruckSim® modeling and simulation software was utilized to predict the forces in all three directions during various operating maneuvers. Computer simulations suggest the largest forces are experienced during coupling operations as opposed to severe maneuvering or braking. The development of a Finite Element Analysis (FEA) model of the tractor-semitrailer coupling determined that high coupling speeds would overload the kingpin-fifthwheel structure. The FEA model also allowed researchers to determine that a damping system would lower the forces at the kingpin-fifthwheel interface to the magnitude of forces experienced during normal operations. A literature search found no valid documented tests, and determined the SAE J133 kingpin loading requirements were incorrect.

Modal Analysis of Linear Guide Way Junction Surface

2013 ◽  
Vol 380-384 ◽  
pp. 105-108
Author(s):  
Sheng Le Ren ◽  
Tian Yu Cheng ◽  
Ye Dai
Keyword(s):  
Damping Ratio ◽  
Dynamic Performance ◽  
Surface Characteristics ◽  
Test Method ◽  
Joint Surface ◽  
Small Scale ◽  
Static Stiffness ◽  
Element Analysis ◽  
Scale Test ◽  
The Many

Rails is an affordable, fixed, direct the mobile device. Among the many factors that affect performance, the rail surface is a very important factor. This article use test method gets the static stiffness of joint surface and the top five bands of the natural frequency and damping ratio for small linear guides. Test access to the static stiffness will be important in finite element analysis of input parameters. In the course of the study, analysis of dynamic performance of small - scale test guide, Study on Effect of surface characteristics on the structure of the component. By comparing the small guide the results of the analysis and the experimental results to verify the validity and accuracy of the analysis method.

Preliminary Research on Behavior of CFST Columns after Exposure to Overall Stage of Fire

2011 ◽  
Vol 250-253 ◽  
pp. 2729-2733 ◽  
Author(s):  
Jing Xuan Wang ◽  
Peng Peng Zhang ◽  
Wen Da Wang
Keyword(s):  
Solution Method ◽  
Material Model ◽  
Element Analysis ◽  
Combined Load ◽  
Fea Model ◽  
Model Element ◽  
Element Type ◽  
Cfst Columns ◽  
Multi Phase ◽  
Good Agreement

A finite element analysis (FEA) model was proposed to predict the behavior of concrete-filled steel tubular (CFST) columns at overall stage of fire combined load based on ABAQUS. The whole stage includes initial loading, heating, cooling and post-fire phases. Accurate thermal and material model, element type, and solution method were chosen reasonably in the model considering the temperature and combined load. Due to lacking of test data about multi-phase of fires, the FEA model was verified with tests at different stages respectively. Some experimental specimens under different thermal and mechanical conditions were modeled using the FEA model, and the results obtained have good agreement with the experimental results. The mechanism of the CFST columns after exposure to overall stage of fire was also investigated based on the model.

A Numerical Approach for Mechanics of Soil-Tool Interaction for a Robotic Assistant Farmer

2012 ◽  
Author(s):  
Ahad Armin ◽  
Walerian Szyszkowski ◽  
Reza Fotouhi
Keyword(s):  
Soil Mechanics ◽  
Numerical Approach ◽  
Production Costs ◽  
Soil Conditions ◽  
Cutting Depth ◽  
Element Analysis ◽  
3 Dimensional ◽  
Fea Model ◽  
Robotic Assistant ◽  
Good Agreement

Use of mobile robots in farm setting may result in lowering production costs, reducing the manual labors, and may be essential in the future due to a potential shortage of farmers. The conditions, such as blade geometry, soil conditions, and cutting depth, have been shown to have great effects on power consumption and on efficiency of particular farm machineries. In this paper, a 3-dimensional nonlinear finite element analysis (FEA) is developed to analyze behavior of a blade moving in a block of soil, and to find force reactions on the blade. This FEA model resulted in accurately predicting draft forces developed on the blade when it moves through the soil. The deformation of soil in front of the blade during soil-blade interaction is also studied. The FEA results are compared with analytical soil mechanics results which show good agreement.

scholarly journals Nondestructive Evaluation Of A Polymer Composite Hip Implant Using Lock-In Thermography

2021 ◽  
Author(s):  
Ehsan Rahim
Keyword(s):  
Finite Element ◽  
Experimental Testing ◽  
Element Model ◽  
Element Analysis ◽  
Hip Implant ◽  
Polyamide 12 ◽  
Strain Pattern ◽  
Fea Model ◽  
Lock In ◽  
Good Agreement

Lock-in thermography, combined with finite element analysis and experimental testing, was used to investigate the stress/strain pattern in a novel composite hip implant made of carbon fibre and polyamide 12 (CF/PA12). In this study, the geometry of the hip implant was first modelled and analysed in ANSYS workbench 11. Different virtual loads of 800N, 1400N and 2200N were applied on the finite element model of the hip stem at an adduction angle of 15º, thereby replicating the present experimental setup. The values of strains obtained were confirmed by replicating the experiment by using strain gauges. A Pearson's correlation (R²=0.98) was obtained, which indicated good agreement between the FEA model and experimental hip stem. The hip implant was again subjected to similar loading conditions, and stresses were recorded by using a thermal camera at corresponding vertices. The comparison of results showed good agreement between the values of stress calculated from the strain gauge experiment and stress obtained from thermography. This study showed that it was possible to find stresses in a hip implant reliably by thermography.

Study on Plate Forming Using the Line Heating Process of Multiple-torch

2014 ◽  
Vol 30 (03) ◽  
pp. 142-151
Author(s):  
Bo Zhou ◽  
Xiaoshuang Han ◽  
Soon-Keat Tan ◽  
Zhong-chi Liu
Keyword(s):  
Process Design ◽  
Thermal Process ◽  
Heating Process ◽  
Line Heating ◽  
Element Analysis ◽  
Shipbuilding Industry ◽  
Fea Model ◽  
The World ◽  
Line Spacing ◽  
Good Agreement

With increasingly competition in the world shipbuilding market, manual and experiential technique patterns of line heating process could not meet the requirements of modern shipbuilding in product speed and quality. In recent years, the improvement of productivity for line-heating process is one of the goals in the shipbuilding industry, which means an accurate prediction model is very important. In this study, a finite element analysis (FEA) model for the line-heating process was established and experiments were conducted to prove the validity of the model. The final numerical results are in good agreement with experiment results. Based on the FEA model, the feasibility of the multiple-torch process is verified. The multiple-torch process could greatly save processing time, which is entirely feasible in the specific automation implementation. Finally, the effect of heat line spacing is analyzed, which could provide important information for the line-heating process design. The proposed method presents a valuable reference for the study of the similar thermal process.

scholarly journals Experimental and Modeling study of the CO2 absorption performance into DEEA solution in membrane contactor

2021 ◽  
Author(s):  
Yihan Yin ◽  
Aoqian Qiu ◽  
Hongxia Gao ◽  
Zhiwu Liang ◽  
Wilfred Olso ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Co2 Concentration ◽  
Simulation Software ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Element Analysis ◽  
Good Agreement

In this study, the absorption process of the aqueous DEEA solution for CO2 capture in polytetrafluoroethylene hollow-fiber membrane contactor was investigated by both experiment and simulation. Based on the finite element analysis method, a two-dimensional steady-state mathematical model was established using COMSOL Multiphysics simulation software to calculate the CO2 mass transfer flux (JCO2) of DEEA in the hollow fiber membrane contactor under non-wetting and partial wetting conditions and the distribution of CO2 concentration under corresponding conditions. The results show that the predicted JCO2 under 15% membrane wetting conditions is in good agreement with the experimental value, and the mass transfer performance is severely reduced under wetting conditions. In addition, a dimensionless equation was developed to predict the liquid phase, gas phase and membrane phase mass transfer coefficient and JCO2. The calculated JCO2 values are in good agreement with the experimental values with the average relative deviation (AARD) of 9.4%.

INVESTIGATION ON THE STIFFNESS OF 3-HSS PARALLEL KINEMATIC MACHINE USING FINITE ELEMENT ANALYSIS

2002 ◽  
Vol 26 (3) ◽  
pp. 337-346 ◽  
Author(s):  
Lihua Zhou ◽  
Tian Huang ◽  
Hanfried Kerle
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Conceptual Design ◽  
Axial Stiffness ◽  
Parallel Kinematic Machine ◽  
Element Analysis ◽  
Fea Model ◽  
Parallel Kinematic ◽  
Good Agreement

A feasible way to estimate the stiffness of a 3-HSS parallel kinematic machine (PKM) by finite element analysis (FEA) is presented. Taking into consideration the base, columns, carriages struts and the mobile platform, a FEA model for the whole machine is established by solving such problems as match between different element types and simulation of moving components. Later on, this approach is applied to a particular 3-HSS PKM, Linapod, and used to steer the conceptual design of the machine. Furthermore, experiments are made on radial and axial stiffness. By comparison, the FE analytical results show good agreement with experimental data.

Finite Element Analysis of Electroactive Polymer and Magnetoactive Elastomer Based Actuation for Origami-Inspired Folding

2016 ◽  
Author(s):  
Wei Zhang ◽  
Saad Ahmed ◽  
Sarah Masters ◽  
Zoubeida Ounaies ◽  
Mary Frecker
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Smart Materials ◽  
Comsol Multiphysics ◽  
Element Analysis ◽  
Fea Model ◽  
Electric And Magnetic Fields ◽  
External Loads ◽  
Magnetoactive Elastomer ◽  
Good Agreement

With the development of smart materials such as electroactive polymers and magnetoactive elastomers, active origami structures, where desired folded shapes can be achieved using external electric and magnetic stimuli, are showing promising potential in many engineering applications. In this study, finite element analysis (FEA) models are developed in 3-D using COMSOL Multiphysics software for unimorph bending and folding actuated using a single external field, and a bi-fold configuration which is actuated using multi-field stimuli. The objectives of the study are: 1) to investigate folding behavior and effects of geometric parameters, and 2) to maximize actuation for a given stimulus. Experimentally determined mechanical pressures and moments are applied as external loads to simulate electric and magnetic fields, respectively. Good agreement is obtained in the tip displacement and folding angles between the simulation and experiments, which demonstrates the effectiveness of the FEA model.

Sign in / Sign up

Export Citation Format

Share Document