scholarly journals Design and Characterization of a 7.2 kW Solar Simulator

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Antoine Boubault ◽  
Julius Yellowhair ◽  
Clifford K. Ho
Keyword(s):  
Computer Aided Design ◽  
Element Model ◽  
Spot Size ◽  
Labor Costs ◽  
Solar Simulator ◽  
Radiative Efficiency ◽  
System A ◽  
Average Irradiance ◽  
Aided Design

A 7.2 kW (electric input) solar simulator was designed in order to perform accelerated testing on absorber materials for concentrating solar power (CSP) technologies. computer-aided design (cad) software integrating a ray-tracing tool was used to select appropriate components and optimize their positioning in order to achieve the desired concentration. The simulator comprises four identical units, each made out of an ellipsoidal reflector, a metal halide lamp, and an adjustable holding system. A single unit was characterized and shows an experimental average irradiance of 257 kW m−2 on a 25.4 mm (1 in) diameter spot. Shape, spot size, and average irradiance are in good agreement with the model predictions, provided the emitting arc element model is realistic. The innovative four-lamp solar simulator potentially demonstrates peak irradiance of 1140 kW m−2 and average irradiance of 878 kW m−2 over a 25.4 mm diameter area. The electric-to-radiative efficiency is about 0.86. The costs per radiative and electric watt are calculated at $2.31 W−1 and $1.99 W−1, respectively. An upgraded installation including a sturdier structure, computer-controlled lamps, a more reliable lamp holding system, and safety equipment yields a cost per electric watt of about $3.60 W−1 excluding labor costs.

scholarly journals Design and Characterization of a 7.2 KW Solar Simulator

2015 ◽  
Author(s):  
Antoine Boubault ◽  
Julius Yellowhair ◽  
Clifford K. Ho
Keyword(s):  
Computer Aided Design ◽  
Spot Size ◽  
Solar Simulator ◽  
System A ◽  
Metal Halide Lamp ◽  
Model Predictions ◽  
Average Irradiance ◽  
Aided Design ◽  
Good Agreement

A 7.2 kW radiative solar simulator was designed in order to perform accelerated testing on absorber materials for concentrating solar power (CSP) technologies. Computer-aided design (CAD) software integrating a ray-tracing tool was used to select appropriate components and optimize their positioning in order to achieve the desired concentration. The simulator comprises four identical units, each made out of an ellipsoidal reflector, a metal halide lamp and an adjustable holding system. A single unit was characterized and shows an experimental average irradiance of 257 kW m−2 on a 25.4 mm (1 inch) diameter spot. Shape, spot size and average irradiance are in good agreement with the model predictions. The innovative four-lamp solar simulator potentially demonstrates peak irradiance of 1140 kW m−2 and average irradiance of 878 kW m−2 over a 25.4 mm diameter spot. The costs per radiative and electric watt are calculated at $2.31 W−1 and $1.99 W−1, respectively.

3D Stress Analysis of ITER Tokamak Assembly

2015 ◽  
Vol 815 ◽  
pp. 238-242
Author(s):  
M. Hafiz ◽  
M. Afendi
Keyword(s):  
Computer Aided Design ◽  
Maximum Shear Stress ◽  
Element Model ◽  
Vacuum Vessel ◽  
Constraint Condition ◽  
Determine Parameter ◽  
Hot Plasma ◽  
Nuclear Shielding ◽  
External Component ◽  
Aided Design

International Thermonuclear Experimental Reactor (ITER) is build based on the ‘tokamak’ concept of magnetic confinement, in which the plasma is contained in a doughnut-shaped vacuum vessel which powered up by the fuel of a mixture of deuterium and tritium. The two isotopes of hydrogen are then heated to a certain temperatures in excess of 150 million °C, forming hot plasma. The Blanket Module (BM) is arranged around the plasma to provide thermal and nuclear shielding for the vacuum vessel (VV), magnets, and other external component. Therefore, it is important to determine parameter that would affect the development process of BM. Analysis is very important in the design process for the ITER BM as well as nearby components. So a finite element model was developed on the BM and the detail part of the BM was developed using computer aided design (CAD) software. The detail part was inserted into the VV and several simulations were performed to find out the stress distribution within the wall of the BM. The constraint condition was find out and evaluated. The result shows that the maximum shear stress is 539.97MPa which exceed the allowable value of 515MPa. The result shows some acceptable stress levels in most of the analysed geometry. The result obtained was used to further modify the BM design in the cases where limits are exceeded.

Vertical tail FEA with a CAD/CAE based multidisciplinary process

2018 ◽  
Vol 90 (4) ◽  
pp. 652-658
Author(s):  
Péter Deák
Keyword(s):  
Finite Element ◽  
Computer Aided Design ◽  
Tail Length ◽  
Element Model ◽  
Point Of View ◽  
Content Type ◽  
Nodal Displacements ◽  
Von Mises ◽  
Von Mises Stresses ◽  
Aided Design

Purpose The purpose of this paper is to make an analytical comparison of two vertical tail models from a structural point of view. Design/methodology/approach The original vertical tail design of PZL-106BT aircraft was used for Computer aided design (CAD) modeling and for creating the finite element model. Findings The nodal displacements, Von-Mises stresses and Buckling factors for two vertical tail models have been found using the finite element method. The idea of a possible Multidisciplinary concept assessment and design (MDCAD) concept was presented. Practical implications The used software analogy introduces an idea of having an automated calculation procedure within the framework of MDCAD. Originality/value The aircraft used for calculation had undergone a modification in its vertical tail length, as there was an urgent need to calculate for the plane’s manufacturer, PZL Warszawa – Okecie.

BCI-Touch Based System: A Multimodal CAD Interface for Object Manipulation

2013 ◽  
Author(s):  
Rohit Bhat ◽  
Akshay Deshpande ◽  
Rahul Rai ◽  
Ehsan Tarkesh Esfahani
Keyword(s):  
Computer Aided Design ◽  
Brain Activity ◽  
Temporal Cortex ◽  
Target Object ◽  
Time Frequency ◽  
System A ◽  
Computer Interfaces ◽  
Brain Signals ◽  
Aided Design ◽  
Electroencephalogram Eeg

The aim of this paper is to explore a new multimodal Computer Aided Design (CAD) platform based on brain-computer interfaces and touch based systems. The paper describes experiments and algorithms for manipulating geometrical objects in CAD systems using touch-based gestures and movement imagery detected though brain waves. Gestures associated with touch based systems are subjected to ambiguity since they are two dimensional in nature. Brain signals are considered here as the main source to resolve these ambiguities. The brainwaves are recorded in terms of electroencephalogram (EEG) signals. Users wear a neuroheadset and try to move and rotate a target object on a touch screen. As they perform these actions, the EEG headset collects brain activity from 14 locations on the scalp. The data is analyzed in the time-frequency domain to detect the desynchronizations of certain frequency bands (3–7Hz, 8–13 Hz, 14–20Hz 21–29Hz and 30–50Hz) in the temporal cortex as an indication of motor imagery.

Design, Construction, and Characterization of an Adjustable 70 kW High-Flux Solar Simulator

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Jinliang Xu ◽  
Cheng Tang ◽  
Yongpan Cheng ◽  
Zijin Li ◽  
Hui Cao ◽  
...  
Keyword(s):  
Focal Plane ◽  
Cooling System ◽  
Air Cooling ◽  
Power Capacity ◽  
Solar Simulator ◽  
Participating Media ◽  
System A ◽  
Full Power ◽  
Design Construction

The design, construction, and characterization of a solar simulator are reported. The solar simulator consists of an optical system, a power source system, an air cooling system, a control system, and a calibration system. Seven xenon short-arc lamps were used, each consuming 10 kW electricity. The lamps were aligned at the reflector ellipsoidal axis. The stochastic Monte Carlo method analyzed the interactions between light rays and reflector surfaces as well as participating media. The seven lamps have a common focal plane. The focal plane diameters can be changed in the range of 60–120 mm with the lamp module traveling the distance in a range of 0–300 mm. The calibration process established a linear relationship between irradiant fluxes and grayscale values. The measures to reduce irradiant flux error and fluctuations were described. The irradiant flux distribution can be changed by varying the power capacities and/or moving the focal plane locations. The peak fluxes are 1.92, 3.16, and 3.91 MW/m2 for 25%, 50%, and 75% of the full power capacity. The peak flux and temperature exceed 4 MW/m2 and 2300 K, respectively, for the full power capacity. A 8 cm thick refractory brick can be melt in 2 min with the melting temperature of about 2300 K when the solar simulator is operating at 70% of the maximum power capacity.

scholarly journals Study of Morpho-Geometric Variables to Improve the Diagnosis in Keratoconus with Mild Visual Limitation

Symmetry ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 306 ◽  
Author(s):  
Francisco Cavas-Martínez ◽  
Daniel Fernández-Pacheco ◽  
Francisco Cañavate ◽  
Jose Velázquez-Blázquez ◽  
Jose Bolarín ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Operating Characteristic ◽  
Three Dimensional ◽  
Patient Specific ◽  
Control Group ◽  
Spatial Profile ◽  
New Methods ◽  
Geometric Variables ◽  
Aided Design

The validation of new methods for the diagnosis of incipient cases of Keratoconus (KC) with mild visual limitation is of great interest in the field of ophthalmology. During the asymmetric progression of the disease, the current diagnostic indexes do not record the geometric decompensation of the corneal curvature nor the variation of the spatial profile that occurs in singular points of the cornea. The purpose of this work is to determine the structural characterization of the asymmetry of the disease by using morpho-geometric parameters in KC eyes with mild visual limitation including using an analysis of a patient-specific virtual model with the aid of computer-aided design (CAD) tools. This comparative study included 80 eyes of patients classified as mild KC according to the degree of visual limitation and a control group of 122 eyes of normal patients. The metric with the highest area under the receiver operating characteristic (ROC) curve was the posterior apex deviation. The most prominent correlation was found between the anterior and posterior deviations of the thinnest point for the mild keratoconic cases. This new custom computational approach provides the clinician with a three-dimensional view of the corneal architecture when the visual loss starts to impair.

Operator Station Design System: A Computer Aided Design Approach to Work Station Layout

1979 ◽  
Vol 23 (1) ◽  
pp. 55-58 ◽  
Author(s):  
James L. Lewis
Keyword(s):  
Computer Aided Design ◽  
Interactive Design ◽  
Computer Hardware ◽  
Design System ◽  
Spacecraft Design ◽  
Work Station ◽  
System A ◽  
Phase Study ◽  
Aided Design ◽  
Design Division

The Operator Station Design System is resident in NASA's Johnson Space Center Spacecraft Design Division Design Performance Laboratory. It includes stand-alone mini-computer hardware and Panel Layout Automated Interactive Design and Crew Station Assessment of Reach software. The data base consists of the Shuttle Transportation System Orbiter Crew Compartment (in part), the Orbiter payload bay and remote manipulator (in part), and various anthropometric populations. The system is utilized to provide panel layouts, assess reach and vision, determine interference and fit problems early in the design phase, study design applications as a function of anthropometric and mission requirements, and to accomplish conceptual design to support advanced study efforts.

scholarly journals Design and manufacturing of patient-specific orthodontic appliances by computer-aided engineering techniques

2017 ◽  
Vol 232 (1) ◽  
pp. 54-66 ◽  
Author(s):  
Sandro Barone ◽  
Paolo Neri ◽  
Alessandro Paoli ◽  
Armando Viviano Razionale
Keyword(s):  
Computer Aided Design ◽  
Low Cost ◽  
Element Model ◽  
Patient Specific ◽  
Orthodontic Appliances ◽  
Digital Reconstruction ◽  
Computer Aided ◽  
Design And Manufacturing ◽  
Aided Design ◽  
Low Cost Manufacturing

Orthodontic treatments are usually performed using fixed brackets or removable oral appliances, which are traditionally made from alginate impressions and wax registrations. Among removable devices, eruption guidance appliances are used for early orthodontic treatments in order to intercept and prevent malocclusion problems. Commercially available eruption guidance appliances, however, are symmetric devices produced using a few standard sizes. For this reason, they are not able to meet all the specific patient’s needs since the actual dental anatomies present various geometries and asymmetric conditions. In this article, a computer-aided design-based methodology for the design and manufacturing of a patient-specific eruption guidance appliances is presented. The proposed approach is based on the digitalization of several steps of the overall process: from the digital reconstruction of patients’ anatomies to the manufacturing of customized appliances. A finite element model has been developed to evaluate the temporomandibular joint disks stress level caused by using symmetric eruption guidance appliances with different teeth misalignment conditions. The developed model can then be used to guide the design of a patient-specific appliance with the aim at reducing the patient discomfort. At this purpose, two different customization levels are proposed in order to face both arches and single tooth misalignment issues. A low-cost manufacturing process, based on an additive manufacturing technique, is finally presented and discussed.

Design of Longitudinal Beam Layout on a Curved Shell Based on the Production-Oriented Design Concept

1994 ◽  
Vol 10 (04) ◽  
pp. 217-222
Author(s):  
Kohji Honda ◽  
Noriyuki Tabushi
Keyword(s):  
Crude Oil ◽  
Computer Aided Design ◽  
Design Method ◽  
Three Dimensional ◽  
Design System ◽  
Two Dimensional ◽  
Skilled Workers ◽  
System A ◽  
Computer Aided ◽  
Aided Design

A VLCC (very large crude oil carrier) has approximately 1000 curved longitudinal beams, many of which have three-dimensional complicated curvatures. Due to the shortage of highly skilled workers and the need to keep costs down, production and structural designers have worked to reduce the number of such beams. In order to meet the requirements of production, the authors' company has attempted several design approaches for the longitudinal beam layout to reduce the number of beams that have complicated curvature. Recently, through the application of a computer-aided design system, which has been improved for shipbuilding based on the Calma's system, a new design method for the longitudinal beam layout has been successfully developed. A significant number of beams with a twisted configuration have been eliminated and replaced with beams of simpler, two-dimensional shapes. This paper shows the transition of these design approaches, and the application of the new design to building a VLCC.

Sign in / Sign up

Export Citation Format

Share Document