New measurement technique and model for friction torque in continuous drive friction welding: engineering oriented voltage–current floating evaluation measurement method and exponential function model of friction torque

2001 ◽  
Vol 6 (4) ◽  
pp. 209-212 ◽  
Author(s):  
J. Luo
Keyword(s):  
Exponential Function ◽  
Measurement Technique ◽  
Friction Welding ◽  
Measurement Method ◽  
Friction Torque ◽  
Function Model ◽  
Model Of Friction ◽  
Evaluation Measurement

scholarly journals A Repeatable and Reproducible Digital Method to Quantify the Cement Excess and Enamel Loss after Debonding Lingual Multibracket Appliance Therapy

2021 ◽  
Vol 11 (3) ◽  
pp. 1295
Author(s):  
Alba Belanche Monterde ◽  
Alberto Albaladejo Martínez ◽  
Alfonso Alvarado Lorenzo ◽  
Adrián Curto ◽  
Jorge Alonso Pérez-Barquero ◽  
...  
Keyword(s):  
Measurement Technique ◽  
Measurement Method ◽  
Dental Arch ◽  
Micro Computed Tomography ◽  
Morphometric Measurement ◽  
Before And After ◽  
Repeatability And Reproducibility ◽  
Lingual Brackets ◽  
Multibracket Appliance ◽  
Area And Volume

The aim of the present study is to present a repeatable, reproductible, and accurate morphometric measurement method for measuring and quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances. Ten conventional lingual brackets were cemented in 10 extracted teeth embedded into an epoxy resin model simulating a dental arch. This model was scanned before and after bonding the lingual brackets, after debonding, and after polishing the surfaces. We also performed a Micro-Computed Tomography scan of the lingual brackets used. Afterward, the standard tessellation language (STL) digital file was aligned, each tooth was segmented individually, and the file was re-aligned using engineer morphometry software. Inter-operator and intra-operator comparative analyses were performed using the ANOVA test, and the repeatability and reproducibility of the morphometric measurement technique were analyzed using Gage R&R statistical analysis. Repeatability showed 0.07% and 0.16% variability associated with the area and volume measures, respectively, while reproducibility showed 0.00% variability associated with the area and volume measures, respectively. In conclusion, the morphometric measurement technique is a repeatable, reproductible, and accurate morphometric measurement method for quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances.

scholarly journals Modification of Hot-Wire Anemometers Frequency Bandwidth Measurement Method

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1595
Author(s):  
Paweł Ligęza
Keyword(s):  
Measurement Technique ◽  
Measurement Method ◽  
Sine Wave ◽  
Frequency Bandwidth ◽  
Hot Wire ◽  
Electrical Test ◽  
Modified Method ◽  
Key Issues ◽  
Wire System

In measurements of fast-changing flows, one of the key issues is knowledge of the anemometer frequency bandwidth. In such measurements, the measurement technique often used is hot-wire anemometry. The determination and optimization of the measurement bandwidth of the hot-wire system is very important for the quality of the measurements carried out. One of the methods used is square-wave or sine-wave electrical testing. The article proposes modification of this method, which involves applying an electrical test signal wirelessly directly to the sensor, using transformer inductive coupling. This modification may in some cases be beneficial and find application in selected metrological problems. The article describes the modified method and its example application.

249 Simulation of friction torque and temperature at welded interface in 1st phase of friction welding

2001 ◽  
Vol 2001 (0) ◽  
pp. 213-214
Author(s):  
Masaaki KIMURA ◽  
Kenji SEO ◽  
Masahiro KUSAKA ◽  
Kenji YOSHIOKA ◽  
Akiyoshi FUJI
Keyword(s):  
Friction Welding ◽  
Friction Torque

scholarly journals Effect of Inner Diameter on Friction Torque in Friction Welding of Pipes

2004 ◽  
Vol 22 (2) ◽  
pp. 233-239 ◽  
Author(s):  
Masaaki KIMURA ◽  
Masahiro KUSAKA ◽  
Kenji SEO ◽  
Akiyoshi FUJI
Keyword(s):  
Friction Welding ◽  
Friction Torque ◽  
Inner Diameter

Experimental Determination and Analytical Model of Friction Torque of a Double Row Roller Slewing Bearing

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Ahmet Dindar ◽  
Metin Akkök ◽  
Mehmet Çalışkan
Keyword(s):  
Friction Torque ◽  
Rolling Motion ◽  
Double Row ◽  
Element Analysis ◽  
Slewing Bearing ◽  
Torque Measurements ◽  
Multibody Dynamic ◽  
Lip Seals ◽  
Friction Identification ◽  
Model Of Friction

In this paper, investigation on the friction torque of a double row roller slewing bearing which is operated in the azimuth axis of a gun turret is performed. For this purpose, a friction measurement test setup is designed and friction torque measurements are conducted. Tests are performed at low speeds and various loading conditions. Friction sources are decoupled and examined separately in order to fully understand effect of each component on friction torque of the slewing bearing. Therefore, friction caused by rolling motion and friction caused by two different types of lip seals are investigated. In addition, friction identification analyses are performed. In the analysis, load distribution of the bearing is calculated by finite element analysis software and rolling motion is simulated with a multibody-dynamic analysis program. In the end, analyses results are compared and verified with the test results.

scholarly journals Two-Phase Exponential Model of Wealth Distribution

2020 ◽  
Vol 58 (1) ◽  
pp. 33-52
Author(s):  
Ognjen Radović ◽  
Zoran Tomić ◽  
Jelena Z. Stanković
Keyword(s):  
Exponential Function ◽  
Distribution System ◽  
Statistical Physics ◽  
Wealth Distribution ◽  
Exponential Model ◽  
Pareto Principle ◽  
Function Model ◽  
Two Phase ◽  
Agent Based ◽  
Scientific Fields

AbstractThe topic of wealth and money distribution attracts great attention of economists, as well as researchers from other scientific fields, such as statistical physics and econophysics. An increasing number of models and simulations are being created in order to understand the process of wealth distribution and reaching the steady state of the distribution system. Also, the number of papers dealing with analysis and determining the distribution proportion is constantly growing, and, unlike the previous years, when the Pareto principle was “80-20”, today that principle could be “90-10”and even “90-20”. In this paper we present an agent-based simulation model derived from econophysics that describes the dynamics of wealth distribution. Two models of exponential function are tested: a one-phase model that uses the Newton’s law of cooling and a two-phase exponential function model. We found that exponential decreasing function adequately described the dynamics of wealth distribution, especially in the models without the possibility of borrowing money, and the validity of the Pareto principle “80-20” in these models could be confirmed.

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