scholarly journals Development Of A Virtual Refrigeration Apparatus To Promote Understanding Of The Actual Experiment

2020 ◽  
Author(s):  
Patrick Tebbe
Keyword(s):  
Actual Experiment

scholarly journals Finite Element Modeling of Residual Stress at Joint Interface of Titanium Alloy and 17-4PH Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 629
Author(s):  
Nana Kwabena Adomako ◽  
Sung Hoon Kim ◽  
Ji Hong Yoon ◽  
Se-Hwan Lee ◽  
Jeoung Han Kim
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Finite Element Modeling ◽  
Equivalent Stress ◽  
Stress Gradient ◽  
Joint Interface ◽  
Element Modeling ◽  
Actual Experiment ◽  
Maximum Equivalent Stress

Residual stress is a crucial element in determining the integrity of parts and lifetime of additively manufactured structures. In stainless steel and Ti-6Al-4V fabricated joints, residual stress causes cracking and delamination of the brittle intermetallic joint interface. Knowledge of the degree of residual stress at the joint interface is, therefore, important; however, the available information is limited owing to the joint’s brittle nature and its high failure susceptibility. In this study, the residual stress distribution during the deposition of 17-4PH stainless steel on Ti-6Al-4V alloy was predicted using Simufact additive software based on the finite element modeling technique. A sharp stress gradient was revealed at the joint interface, with compressive stress on the Ti-6Al-4V side and tensile stress on the 17-4PH side. This distribution is attributed to the large difference in the coefficients of thermal expansion of the two metals. The 17-4PH side exhibited maximum equivalent stress of 500 MPa, which was twice that of the Ti-6Al-4V side (240 MPa). This showed good correlation with the thermal residual stress calculations of the alloys. The thermal history predicted via simulation at the joint interface was within the temperature range of 368–477 °C and was highly congruent with that obtained in the actual experiment, approximately 300–450 °C. In the actual experiment, joint delamination occurred, ascribable to the residual stress accumulation and multiple additive manufacturing (AM) thermal cycles on the brittle FeTi and Fe2Ti intermetallic joint interface. The build deflected to the side at an angle of 0.708° after the simulation. This study could serve as a valid reference for engineers to understand the residual stress development in 17-4PH and Ti-6Al-4V joints fabricated with AM.

A New Stress Sensor Based on Amorphous Alloy for Dynamic Weigh Rail

2011 ◽  
Vol 204-210 ◽  
pp. 608-611
Author(s):  
Yan Ping Shi
Keyword(s):  
Amorphous Alloy ◽  
Testing Machine ◽  
Material Testing ◽  
Static Characteristic ◽  
Stress Sensor ◽  
Actual Experiment ◽  
High Measurement ◽  
Material Testing Machine ◽  
Output Equation

In order to solve some problem of stress sensor in dynamic weigh rail, a new kind of inductive stress sensor based on magnetostriction effect of amorphous alloy was developed. First, the principle of sensor, and inferred its output equation were discussed. Second, the static characteristic experiment and the actual experiment on the material testing machine and the mine haulage rail were separately made. The results of the test have showed that this stress sensor has some characteristics as high measurement sensitiveness and accuracy. Also being simple, convenient and solid to install and use, so it is feasible to apply the sensor for the dynamic weigh rail.

Design Optimization of the Aerial Lift Boom through the Finite-Element Analysis (FEA)

2011 ◽  
Vol 295-297 ◽  
pp. 1564-1567
Author(s):  
Yong Hong ◽  
Seokjun Yu ◽  
Jaejung Lee ◽  
Hyeonsu Ha ◽  
Dong Pyo Hong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Optimization ◽  
Experimental Method ◽  
General Purpose ◽  
Element Analysis ◽  
Actual Experiment ◽  
Multi Stage ◽  
The Finite Element Analysis ◽  
Aerial Platform

The multi-stage boom consisting of several booms is used in order to develop the aerial platform truck that can be used in a working radius that is higher and safe. Because the length increases compared with the width or the height of the structure, the intensity and rigidity are lowered along with the safety. Accordingly, a countermeasure is needed. Therefore, in this research, when designing of the high ground work difference Boom System, the safety the stress of the considered boom the analyze method and experimental method tries to be evaluated through the comparison. The finite-element analysis(FEA) compared the Strain value which is obtained through the resolution value and actual experiment by using the Ansys,that is the general purpose program, and proved this safety.

scholarly journals Measuring GBAR with emulsion detector

2014 ◽  
Vol 30 ◽  
pp. 1460268 ◽  
Author(s):  
T. Ariga ◽  
S. Aghion ◽  
O. Ahlén ◽  
C. Amsler ◽  
A. Ariga ◽  
...  
Keyword(s):  
Free Fall ◽  
Gravitational Acceleration ◽  
Relative Uncertainty ◽  
Position Resolution ◽  
Actual Experiment ◽  
Universality Of Free Fall

The motivation of the AEgIS experiment is to test the universality of free fall with antimatter. The goal is to reach a relative uncertainty of 1% for the measurement of the earth's gravitational acceleration [Formula: see text] on an antihydrogen beam. High vertex position resolution is required for a position detector. An emulsion based detector can measure the annihilation vertex of antihydrogen atoms with a resolution of 1-2 μm, which if realized in the actual experiment will enable a 1% measurement of [Formula: see text] with less than 1000 [Formula: see text] atoms. Developments and achievements on emulsion detectors for the AEgIS experiment are presented here.

Dynamics of Heat Exchangers and Their Models

1960 ◽  
Vol 82 (2) ◽  
pp. 489-500 ◽  
Author(s):  
Herman Thal-Larsen
Keyword(s):  
Heat Exchanger ◽  
Frequency Response ◽  
Heat Exchangers ◽  
Dynamic Interaction ◽  
Secondary Effects ◽  
Mental Images ◽  
Average Temperature ◽  
Actual Experiment ◽  
Basic Characteristics

The author rejects, momentarily, actual experimentation with real heat exchangers for logical cogitation and arm-chair experiments. Observed as mental images or models, these heat exchangers reveal their basic characteristics—characteristics that will be partially obscured in an actual experiment by secondary effects inherent in the equipment. These basic characteristics, once perceived, may be used to correlate by means of frequency-response diagrams many results heretofore diverse and seemingly unrelated, that have been reported in the literature. Included among such results are not only the dynamics of various types of heat exchangers but also the thermal dynamic interaction between fluids and the confining pipe used for their transport. In addition, the author warns that all too frequently the use of the average temperature in heat-exchanger dynamics is based on faulty logic.

scholarly journals IX. On the impregnation of the ovum in the amphibia. (First series.)

1851 ◽  
Vol 141 ◽  
pp. 169-242 ◽  
Keyword(s):  
Natural History ◽  
Royal Society ◽  
Physical Conditions ◽  
Actual Experiment ◽  
Difficult Subject ◽  
Insight Into

The communication which I have now the honour to present to the Royal Society is a portion of a series of investigations on the Development of the Embryo on which I have been for some years engaged, and which was commenced in a paper on the Development of the Myriapoda, that was honoured with a place in the Philosophical Transactions for 1841. I now propose to give the results of my observations on the Amphibia, reserving to a future early occasion the continuation of those on the Invertebrata commenced in the paper alluded to. The Amphibia, of all the vertebrated animals, afford to us the readiest means of investigating the difficult subject of Impregnation by actual experiment, and it is only, perhaps, by combining experiment with careful observations on the physical conditions that affect the development of the germ, and comparing these with the facts of the natural history and instincts of the species, that we may hope, ultimately, to obtain some further insight into this one of Nature’s most hidden secrets.

scholarly journals An experimental examination into the growth of the blastoderm of the chick

1897 ◽  
Vol 60 (359-367) ◽  
pp. 349-356 ◽  
Keyword(s):  
Experimental Study ◽  
Primitive Streak ◽  
Experimental Examination ◽  
Actual Experiment

In making an experimental study of the growth of the blastoderm of the chick, I had two chief objects in view: (1) To test by actual experiment Duval’s theory of the formation of the primitive streak. (2) To try and determine experimentally whether the whole or only part of the actual embryo is developed by the activity of the primitive streak. And further, if only a part, to determine its limits.

UKF Filtering of UAV MEMS Gyro Based on Time-Series Model

2011 ◽  
Vol 121-126 ◽  
pp. 4885-4891
Author(s):  
Jia Xu ◽  
Qing Li
Keyword(s):  
Time Series ◽  
Time Series Analysis ◽  
Time Series Model ◽  
Precision Error ◽  
Filtering Method ◽  
Series Analysis ◽  
Actual Experiment ◽  
Analysis Theory

The algorithms and the applications of UKF filtering of UAV MEMS Gyro based on time-series model are presented in this paper. First Gyro output signals are preprocessed and modeled by time-series analysis theory, and then use UKF filtering method to compensating error based on the time-series model. Examples with actual experiment demonstrate that the method has apparent superiority. The simulation result shows that, both in static and dynamic cases, after eliminate the precision error MEMS gyro accuracy can achieve the miniature UAV standards.

Sign in / Sign up

Export Citation Format

Share Document