scholarly journals Modelling and Simulating the Effect of Sunlight Heat on Front Bumper

2019 ◽  
Vol 9 (2) ◽  
pp. 548-554 ◽  
Keyword(s):  
Heat Effect ◽  
Modern World ◽  
Internal Stresses ◽  
Fe Modeling ◽  
Open Area ◽  
High Deformation ◽  
Summer Heat ◽  
Roof Area ◽  
Simulation Results ◽  
Wheel Arch

In this speeding modern world, it became a necessity to have at least one car for every family. There often comes the time when the car has to be parked in an open area due to space or parking unavailability. During daytime, the sunlight heat causes the car’s exterior parts to get heated. Especially the summer heat in India is unbearable. The temperature rises too high that the stationery car’s exterior parts can reach the temperature of 90°C (Considering the car is stationery for over a period of time). The parts of the car that are exposed to sunlight heat are Hood, Front and rear bumper, Doors and Roof area. Out of all the exterior parts, Bumper is plastic and it is the most important when it comes to style and safety. In this research the effect of Sunlight heat on Front bumper is studied. The problems associated with sunlight heat on Front bumper are; the front bumper goes out of its original shape, disturbs the Clearance (Gaps) and fitting with surrounding parts, if the surrounding parts are too stiff the Front bumper itself undergoes high deformation and high internal stresses will be developed at the mating regions. In this research the FE modeling of Front bumper is done using ANSA software, the sunlight heat effect is simulated using ABAQUS solver. From the simulation results, there is 5.86mm deformation observed on Front bumper, and at the mating regions (The region where Front bumper is surrounded by other parts like Head lamp, Hood, Wheel arch) there is a displacement of 3.39mm (maximum clearance maintained at mating regions is 3mm). Several countermeasures were studied and the best way to avoid the deformation is adding Honey-comb ribs, stiffeners at the mating regions.

Effect of Material Parameters Wave on Sheet Metal Springback Using Orthogonal Design Simulation

2011 ◽  
Vol 314-316 ◽  
pp. 585-588 ◽  
Author(s):  
Lei Chen
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Orthogonal Design ◽  
Direct Analysis ◽  
Element Model ◽  
Internal Stresses ◽  
Common Phenomenon ◽  
Material Parameters ◽  
Simulation Results

Springback is a common phenomenon in sheet metal forming, caused by the elastic redistribution of the internal stresses during unloading. The aim of this search is to investigate the wave of material parameters on the results of forming and springback of sheet metal. A finite element model of cylinder bending benchmark of NUMISHEET’2002 was proposed firstly to simulate bending and springback with contact evolution between tools and blank based on static implicit method. The simulation results agree well with the experiment. Then the effects of the wave of material parameters on forming and springback results are investigated using orthogonal design simulation. Eight factors are investigated with the orthogonal label. The results show the factors have different effects on both the forming and springback. And the significance of the factors is shown through direct analysis of the results.

Foundry Technique Designing and Optimization of the Cast-Steel Casting

2014 ◽  
Vol 556-562 ◽  
pp. 1155-1158
Author(s):  
Bin Feng He
Keyword(s):  
Heat Effect ◽  
Steel Casting ◽  
Traditional Method ◽  
Cast Steel ◽  
Simulation Software ◽  
Simulation Results

The traditional method has been used to the foundry technique for the cast-steel casting. And the commercial foundry simulation software was used to validate the rationality of the foundry technique. Four side risers and some cylindrical chills were used to decrease the shrinkages which would occur in casting. The results show that the risers could not feed the casting effectively because of the limited feeding distance. A top riser was introduced to eliminate the defects, the simulation results show that still some shrinkages occurred because the heat effect between risers. The side risers were replaced by an annular chill. Finally, the shrinkages would happened in casting were eliminated.

scholarly journals Finite Element (FE) Modeling of Indirect Tension to Cylindrical (IT-CY) Specimen Test for Damping Asphalt Mixtures (DAMs)

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jiandong Huang ◽  
Tianhong Duan ◽  
Yuantian Sun ◽  
Lin Wang ◽  
Yawei Lei
Keyword(s):  
Finite Element ◽  
Laboratory Test ◽  
Viscoelastic Behavior ◽  
Asphalt Mixtures ◽  
Fe Model ◽  
Fe Modeling ◽  
Indirect Tension ◽  
Specimen Test ◽  
Simulation Results

DAMs have recently been developed to be used as the damping layer in the so-called antivibration pavement to mitigate the effects of traffic-induced vibration while rare finite element (FE) modeling has been conducted to simulate the indirect tension to cylindrical (IT-CY) specimen test for DAMs. In the present study, the methods for the viscoelastic characterization of DAMs and the techniques to characterize the viscoelastic behavior of DAMs in FE modeling were proposed. The FE model to simulate the IT-CY test was constructed, and it was verified through the corresponding laboratory test. Good agreements were noted between the simulation results and testing results demonstrating that the FE model can provide the accurate prediction of the mechanical behavior of DAMs.

Observation of Dislocation Microstructures and Simulation of Stress Field during Fatigue Crack Initiation in a Copper Single Crystal

2006 ◽  
Vol 312 ◽  
pp. 71-76
Author(s):  
J.H. Yang ◽  
Xiao Ping Zhang ◽  
Yiu Wing Mai ◽  
W. Yan
Keyword(s):  
Single Crystal ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
High Stress ◽  
Dislocation Dynamics ◽  
Copper Single Crystal ◽  
Internal Stresses ◽  
Shear Stresses ◽  
The Matrix ◽  
Simulation Results

How a crack initiates from the smooth surface of single crystals subjected to uniaxial cyclic loading is unclear. Experiments were conducted to observe in detail the dislocation microstructures during the saturation stage of cyclic deformation in a copper single crystal using scanning electron microscopy and the electron channeling contrast (SEM–ECC) technique. Some dark zones were found in the dislocation microstructures, which were located either at the edge region of the specimen or within the persistent slip bands (PSBs) at the matrix/PSB interfaces. Hence, fatigue cracks will initiate at these sites with high stress concentrations, i.e., the dark zones. Also, dislocation dynamics (DD) simulation was adopted to calculate internal stress distributions induced by dislocations, and finite element analysis (FEA) used to obtain stress distribution at the matrix/PSB interfaces and neighboring micro-regions caused by an externally applied load. Simulation results show that the external shear stresses distribute uniformly in all specimens; while near the free-surface regions, the maximum value of internal stresses not only occurs at interfaces between PSBs and dislocation matrix, but also at locations where these interfaces cross the freesurface. Consequently, the interfaces are most probable sites for nucleated cracks. Finally, the simulation results agree well with experimental observations.

scholarly journals Using of the SPSA method to improve the accuracy of the UAV following a given route under the action of wind loads

2021 ◽  
pp. 224-230
Author(s):  
Konstantin Amelin ◽  
Vladimir Maltsev
Keyword(s):  
Coordinate System ◽  
Unmanned Aerial Vehicles ◽  
Aerial Photography ◽  
Modern World ◽  
Global Coordinate System ◽  
External Disturbances ◽  
Flight Tests ◽  
Algorithm Operation ◽  
Simulation Results ◽  
The Given

In the modern world, UAVs (unmanned aerial vehicles) are increasingly used in everyday life in solving civilian tasks. One of the main applications of UAVs is data collection with their reference to a given coordinate system. For example, for the task of aerial photography, it is necessary to accurately link each image to the global coordinate system. In addition to the exact location of coordinates, it is worth the exact movement of a given route, to collect data of exactly those places that are needed. Thus, it is very important to ensure the minimum deviation of the UAV from the given route under the conditions of external disturbances (wind disturbances) acting on it. The article describes a procedure for assessing wind speed and direction for a UAV control system using the SPSA method. The simulation results of the algorithm operation, confirmed during flight tests on an ultralight UAV with an ardupilot autopilot, are presented.

scholarly journals Analisis Hasil Pengukuran Bidang Tanah Menggunakan Teknologi CORS-­NTRIP dan PPP

2018 ◽  
Vol 2016 (2) ◽  
Author(s):  
Gusti Ayu Jessy Kartini ◽  
Salman Rahmani ◽  
Reza Palevi
Keyword(s):  
Measurement Method ◽  
Rice Field ◽  
Satellite Observation ◽  
Satellite Observations ◽  
Open Area ◽  
Space Utilization ◽  
Building Area ◽  
Simulation Results ◽  
Technical Guidance

ABSTRAKKebutuhan akan pemanfaatan tanah dan ruang semakin meningkat setiap tahun. Untuk mengendalikan kebutuhan tersebut maka diperlukan penyediaan sertifikat bidang tanah. Pengadaan sertifikat ini terkait erat dengan metode pengukuran. Badan Pertanahan Nasional melalui petunjuk teknisnya membagi metode pengukuran menjadi empat. Di antara keempat metode tersebut yang akan digunakan pada penelitian ini adalah metode terestrial dan pengamatan satelit. Penelitian ini bertujuan untuk menganalisis hasil pengukuran pengamatan satelit menggunakan teknologi CORS-­NTRIP dan PPP yang akan dibandingkan dengan metode terestrial. Simulasi pengukuran dilakukan pada empat jenis bidang tanah, yaitu kebun, lapangan, sawah, dan perumahan. Dari hasil simulasi tersebut disimpulkan bahwa salah satu hal yang mempengaruhi letak dan luas bidang tanah adalah ruang pandang receiver terhadap langit. Dari penelitian ini direkomendasikan agar pengukuran bidang tanah dapat dilakukan dengan menggunakan metode kombinasi.Kata kunci: bidang tanah, GNSS, CORS, NTRIP, PPPABSTRACTThe need for land and space utilization is increasing every year. To control these needs, it is necessary to provide a certificate of land parcels. The procurement of the certificate is closely related to the measurement method. The National Land Agency, through its technical guidance, divides the measurement method into four. Among the four methods, which will be used in this study are terrestrial methods and satellite observations. The purpose of this study was to analyze the results of satellite observation measurements using CORS-­NTRIP and PPP technologies that would be compared with terrestrial methods. The measurement simulation has been carried out by four types of parcels, ie. farm, open area, rice field, and building area. From the simulation results, it is concluded that one of the things that affect the location and the area of land is the receiver's view of the sky. From this research, it is recommended that land parcels measurement should be done by using a combination method.Key words: land parcel, GNSS, CORS, NTRIP, PPP

The use of a Bent Grid to Improve the take-Off Angle for Electron Probe Analysis

1976 ◽  
Vol 34 ◽  
pp. 360-361
Author(s):  
Delbert E. Philpott ◽  
David Leaffer
Keyword(s):  
Quantitative Analysis ◽  
Tilt Angle ◽  
Count Rate ◽  
Electron Probe ◽  
Open Area ◽  
Electron Probe Analysis ◽  
Background Ratio ◽  
Probe Analysis

There are certain advantages for electron probe analysis if the sample can be tilted directly towards the detector. The count rate is higher, it optimizes the geometry since only one angle need be taken into account for quantitative analysis and the signal to background ratio is improved. The need for less tilt angle may be an advantage because the grid bars are not moved quite as close to each other, leaving a little more open area for observation. Our present detector (EDAX) and microscope (Philips 300) combination precludes moving the detector behind the microscope where it would point directly at the grid. Therefore, the angle of the specimen was changed in order to optimize the geometry between the specimen and the detector.

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

Humanitarianism in the Modern World

2020 ◽  
Author(s):  
Norbert Götz ◽  
Georgina Brewis ◽  
Steffen Werther
Keyword(s):  
Modern World
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