scholarly journals Energy Dissipation Characteristics and Parameter Identification of Symmetrically Coated Damping Structure of Pipelines under Different Temperature Environment

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1283
Author(s):  
Feng Jiang ◽  
Zheyu Ding ◽  
Yiwan Wu ◽  
Hongbai Bai ◽  
Yichuan Shao ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Hysteresis Loop ◽  
Least Square Method ◽  
Least Square ◽  
Test Results ◽  
Restoring Force ◽  
Dissipation Model ◽  
Effects Of Temperature ◽  
Dissipation Test ◽  
Metal Wires

In this paper, a symmetrically coated damping structure for entangled metallic wire materials (EMWM) of pipelines was designed to reduce the vibration of high temperature (300 °C) pipeline. A series of energy dissipation tests were carried out on the symmetrically coated damping structure at 20–300 °C. Based on the energy dissipation test results, the hysteresis loop was drawn. The effects of temperature, vibration amplitude, frequency, and density of EMWM on the energy dissipation characteristics of coated damping structures were investigated. A nonlinear energy dissipation model of the symmetrically coated damping structure with temperature parameters was established through the accurate decomposition of the hysteresis loop. The parameters of the nonlinear model were identified by the least square method. The energy dissipation test results show that the symmetrically coated damping structure for EMWM of pipelines had excellent and stable damping properties, and the established model could well describe the changing law of the restoring force and displacement of the symmetrically coated damping structure with amplitude, frequency, density, and ambient temperature. It is possible to reduce the vibration of pipelines in a wider temperature range by replacing different metal wires.

scholarly journals Human Development Index (HDI) in Papua Province

2015 ◽  
Vol 6 (3) ◽  
pp. 24-29
Author(s):  
Nuralam Nuralam
Keyword(s):  
Economic Growth ◽  
Human Development Index ◽  
Power Index ◽  
Least Square Method ◽  
Least Square ◽  
Purchasing Power ◽  
Test Results ◽  
Health Index ◽  
Panel Data Regression ◽  
Data Regression

This study aims to determine the effect of the health index, education index and the index of the economic growth of Papua Province simultaneously and partially. The analytical method used was a panel data regression analysis with Pooled Least Square method. The results showed that the index of health, education index and the index of purchasing power simultaneously and significant affect on economic growth in Papua province, while the partial test results showed that the index of education and purchasing power index affect economic growth positively and significantly, while the health index has no significant effect on the economic growth of Papua Province.

Research on the EDM Equipment and the Machining Technology of the Precision Micro-Hole

2014 ◽  
Vol 551 ◽  
pp. 237-243
Author(s):  
Yan Hua Cai ◽  
Jian Yong Liu ◽  
Lian Tong Ding ◽  
Shi Shan He ◽  
Shi Fu Zhang
Keyword(s):  
Functional Relation ◽  
Least Square Method ◽  
Least Square ◽  
Work Piece ◽  
Test Results ◽  
Main Structure ◽  
Micro Holes ◽  
Milling Method ◽  
Micro Hole ◽  
On Line

The main structure and key components of the precision EDM equipment are analyzed and researched in this paper. Key components such as main structure, A-axis, W-axis and R-axis are designed. Aimed to machine several kinds of diameters on a work piece, an on-line electrode milling method is studied. And then test this method on an EDM machine. Based on the test results, the functional relation between diameters and the wears of the electrode is confirmed by the least square method. According to this function, the efficiency of the EDM machining for the precision micro-holes is improved.

Anti-Calculated Method of Static Pressure for Silo

2011 ◽  
Vol 243-249 ◽  
pp. 6018-6021
Author(s):  
Xing Pei Liang ◽  
Hui Wang
Keyword(s):  
Taylor Expansion ◽  
Static Pressure ◽  
Least Square Method ◽  
Initial Guess ◽  
Least Square ◽  
Test Results ◽  
The Finite Element Method ◽  
Internal Wall ◽  
Hoop Strain ◽  
Expansion Technique

In this paper, the anti-calculated method for the static pressure associated with the silo structure is developed and the strain sensitivity is derived based on the formulations of the finite element method. In the proposed approach, the Taylor expansion technique at the initial guess strain is used to evaluate the hoop strain at adjacent points and the least square method are employed to match the numerical results and the known test results. Finally, the developed algorithm is verified by solving the silo with internal wall.

scholarly journals Faktor-Faktor yang mempengaruhi Minat Wakaf Masyarakat di Kota Lhokseumawe

2019 ◽  
Vol 3 (2) ◽  
pp. 81
Author(s):  
Falahuddin Falahuddin ◽  
Fuadi Fuadi ◽  
Muhammad Rizki Ramadhan
Keyword(s):  
Data Analysis ◽  
Least Square Method ◽  
Least Square ◽  
Primary Data ◽  
Test Results ◽  
Analysis Method ◽  
Religious Knowledge ◽  
Ordinary Least Square ◽  
Insignificant Effect ◽  
Community Interest

This research is to find out the factors that influence the community Waqf Interest in Lhokseumawe City. The data used are primary data with a sample of 100 respondents. The data analysis method uses multiple linear regression with OLS (Ordinary Least Square) method. The results showed that community religious knowledge had a positive and not significant effect on waqf interest in Lhokseumawe. Perception of Waqf has a positive and insignificant effect on community Waqf Interest in Lhokseumawe City, and Revenue has a positive and insignificant effect on Waqf Community Interest in Lhokseumawe City. The determination test results used were 4%. Keywords: Wakaf Interests, Religiosity Knowledge, Wakif Perception, Income.

Uncertainty Evaluation of Duration of Aircraft DC Transient Signal Based on Least Square Method

2014 ◽  
Vol 599-601 ◽  
pp. 1801-1806
Author(s):  
Pu Zhong Ouyang ◽  
Zhong Hua Zhang ◽  
Jing Yu Sun
Keyword(s):  
Performance Evaluation ◽  
Uncertainty Analysis ◽  
Least Square Method ◽  
Least Square ◽  
Transient Signal ◽  
Uncertainty Evaluation ◽  
Test Results ◽  
Technical Problems ◽  
Signal Waveform ◽  
And Performance

By using the waveform measurements and the least square method, the duration of transient level, and the duration of transient decreasing segment of aircraft DC transient signal are evaluated precisely. The evaluation courses and some technical problems are discussed in detail, the uncertainty analysis both of the durations are presented. Some test results have proved the effectiveness and practicability of the method. It could be applied to the characteristic and performance evaluation of aircraft DC transient signal waveform generators.

A New Magneticrheological Damper Nonlinear Bingham Hysteretic Model and ANSYS Implementation

2013 ◽  
Vol 351-352 ◽  
pp. 1146-1151 ◽  
Author(s):  
Zheng Xin Zhang ◽  
Fang Lin Huang
Keyword(s):  
Mechanical Model ◽  
Least Square Method ◽  
Least Square ◽  
Test Results ◽  
Hysteretic Model ◽  
Damping Force ◽  
Damping Characteristics ◽  
Magneto Rheological ◽  
The Relationship ◽  
Force Characteristics

In this paper, firstly, a new nonlinear Bingham hysteretic model is established by studying on the Test results of damping force characteristics of the magneto rheological fluid. The model not only can simulate the damping characteristics of the magneto rheological damper very well, but also can well describe the relationship between damping and velocity with the small velocity, and has fewer parameters by compared with other magneto rheological damper model. Secondly, based on nonlinear least square method, the parameters with different current are recognized and the relationship between the parameters and current is defined, then the mechanical model is theoretically verified. Furthermore, the mechanical model is simulated by ANSYS, the data obtained agree well with the calculated value.

scholarly journals Energy Dissipation Characteristics and Dynamic Modeling of the Coated Damping Structure for Metal Rubber of Bellows

Metals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 562 ◽  
Author(s):  
Kenan Wu ◽  
Hongbai Bai ◽  
Xin Xue ◽  
Tuo Li ◽  
Min Li
Keyword(s):  
Energy Dissipation ◽  
Vibration Amplitude ◽  
Test Results ◽  
Restoring Force ◽  
Hysteretic System ◽  
Large Size ◽  
Nonlinear Hysteretic System ◽  
Metal Rubber ◽  
Set Up ◽  
Nonlinear Elastic

A novel coated damping structure for metal rubber (MR) of bellows is designed based on large-size metal rubber sheets. This structure is dynamically tested in the bending direction at normal temperature. According to the test results, a model of the nonlinear elastic restoring force is set up, which describes the dynamic characteristics of the coated damping structure for metal rubber of bellows, and identifies the parameters of the model. The results show that the coated damping structure for metal rubber of bellows has a strong damping energy dissipation ability, its dynamic vibration characteristics are related to the vibration amplitude and frequency, and it is a complex nonlinear hysteretic system with multiple damping components. After identification of the parameters, the model of nonlinear elastic restoring force shows highly accurate results.

Direct Assessment of Effective Renal Plasma Flow from Renoscintigraphy with a Gamma Camera and an On-Line Computer

1981 ◽  
Vol 20 (06) ◽  
pp. 274-278
Author(s):  
J. Liniecki ◽  
J. Bialobrzeski ◽  
Ewa Mlodkowska ◽  
M. J. Surma
Keyword(s):  
Count Rate ◽  
Renal Plasma Flow ◽  
Early Period ◽  
Least Square Method ◽  
Least Square ◽  
Uptake Coefficient ◽  
Positive Linear Correlation ◽  
On Line ◽  
Best Fit ◽  
Plasma Activity

A concept of a kidney uptake coefficient (UC) of 131I-o-hippurate was developed by analogy from the corresponding kidney clearance of blood plasma in the early period after injection of the hippurate. The UC for each kidney was defined as the count-rate over its ROI at a time shorter than the peak in the renoscintigraphic curve divided by the integral of the count-rate curve over the "blood"-ROI. A procedure for normalization of both curves against each other was also developed. The total kidney clearance of the hippurate was determined from the function of plasma activity concentration vs. time after a single injection; the determinations were made at 5, 10, 15, 20, 30, 45, 60, 75 and 90 min after intravenous administration of 131I-o-hippurate and the best-fit curve was obtained by means of the least-square method. When the UC was related to the absolute value of the clearance a positive linear correlation was found (r = 0.922, ρ > 0.99). Using this regression equation the clearance could be estimated in reverse from the uptake coefficient calculated solely on the basis of the renoscintigraphic curves without blood sampling. The errors of the estimate are compatible with the requirement of a fast appraisal of renal function for purposes of clinical diagknosis.

PENGARUH KNOWLEDGE MANAGEMENT, KOMPETENSI, MOTIVASI TERHADAP KINERJA KARYAWAN

2015 ◽  
Vol 5 (2) ◽  
pp. 1
Author(s):  
Miftahol Arifin
Keyword(s):  
Knowledge Management ◽  
Linear Regression ◽  
Significant Influence ◽  
Employee Performance ◽  
Least Square Method ◽  
Least Square ◽  
Analysis Tool ◽  
Ordinary Least Square ◽  
Competence Motivation ◽  
Performance Analyze

The purpose of this research is to analyze the influence of knowledge management on employee performance, analyze the effect of competence on employee performance, analyze the influence of motivation on employee performance). In this study, samples taken are structural employees PT.centris Kingdom Taxi Yogyakarta. The analysis tool in this study using multiple linear regression with Ordinary Least Square method (OLS). The conclusion of this study showed that the variables of knowledge management has a significant influence on employee performance, competence variables have an influence on employee performance, motivation variables have an influence on employee performance, The analysis showed that the variables of knowledge management, competence, motivation on employee performance.Keywords: knowledge management, competence, motivation, employee performance.

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