Influence and Analysis of Temperature Rise to Principal Spindle's Rotating Error Test

2013 ◽  
Vol 380-384 ◽  
pp. 101-104
Author(s):  
Kuo Liu ◽  
Jian Feng Lin ◽  
Yue Wu Wang ◽  
Tie Jun Zhu
Keyword(s):  
Test Method ◽  
Test Scheme ◽  
Test Results ◽  
Machine Center ◽  
Rotating Speed ◽  
Speed Test ◽  
Dynamic Errors ◽  
Machine Centers ◽  
Radial Average ◽  
Scientific Test

The form of principal spindle's dynamic errors is analysed firstly. Scientific test scheme is designed to analyse the influence of rotating speed to rotating errors and decrease temperature rises influence. Principal spindle's radial average errors and asynchronous errors, axial average errors and asynchronous errors, minimum radial separation center of some vertical machine center are all tested with SPN-300 of API. Test method is rise speed-test-stop & cooling-rise speed. Three vertical machine centers are tested and every machine center is tested three times at different rotating speed. The test results and the influences of all errors are analysed at last.

Test and Analysis of Machine Center's Principal Spindle Dynamic Errors

2013 ◽  
Vol 364 ◽  
pp. 163-166 ◽  
Author(s):  
Kuo Liu ◽  
Chun Shi Liu ◽  
Zhi Tan ◽  
Shuai Zhou
Keyword(s):  
Test Results ◽  
Machine Center ◽  
Rotating Speed ◽  
Dynamic Errors ◽  
Machine Centers ◽  
Radial Average ◽  
Radial Separation

The form of principal spindle's dynamic errors is analysed firstly. Principal spindle's radial average errors and asynchronous errors, axial average errors and asynchronous errors, minimum radial separation center of some vertical machine center are all tested with SPN-300 of API. Three vertical machine centers are tested and every machine center is tested three times at different rotating speed. The test results and the influences of all errors are analysed at last.

scholarly journals Pengaruh Latihan Dribbling With A Curving Line Trajectory Untuk Meningkatkan Keterampilan Dribbling Pemain Sepak Bola Ps. Undikam Mataram Tahun 2019

2019 ◽  
Vol 4 (4) ◽  
Author(s):  
Ismail Marzuki ◽  
Soemardiawan Soemardiawan
Keyword(s):  
Sampling Technique ◽  
Test Method ◽  
Soccer Players ◽  
Football Players ◽  
Test Results ◽  
Significance Level ◽  
Speed Test ◽  
Table Analysis ◽  
Observation Method ◽  
Line Trajectory

The focus of the problem in this research When competing frequently there are mistakes in dribbling, so from this it is necessary to have this exercise, to improve the dribbling skills of PS players. UNDIKMA Mataram. The purpose of this study is to determine whether there is an effect of Dribbling With A Curving Line Trajectory Exercise on the Dribbling Skills of PS Soccer Players. Mataram UNDIKMA 2019 ". The research methods used by researchers are the observation method, the documentation method and the deed test method. The study design uses a pretest-posttest design (initial test and final test). The population used in this study are all PS players. UNDIKMA Mataram in 2019. The number of samples in the study conducted was 22 which became a sample of 11 players PS soccer players. UNDIKMA Mataram. The sampling technique in this study using the saturation sampling technique is a sampling technique if all members of the population can be sampled. Analysis of statistical data with a significance level of 5% for the speed test results obtained by the t-value so from the results of research X1 (Dribbling With A Curving Line Trajectory, with Y1 obtained tcount is much greater than ttable, this shows that the hypothesis "Ha" (accepted ) then this research is significant, drawing conclusions from the table analysis at a significant level of 5% with a number of samples (n - 1) that is 11-1 = 10 at 1,812. Then it can be concluded that, 1) The Effect of Dribbling With A Curving Line Trajectory on Dribbling Skills PS Football Players. Mataram UNDIKMA 2019, Tcount> ttable (7.362> 1,812). 2). this shows that the hypothesis "Ha" (accepted) then this research is significant.

The Measurement and Process of Aeroengine Inlet Total Pressure Field

2011 ◽  
Vol 383-390 ◽  
pp. 4323-4328
Author(s):  
Xun Yang ◽  
Yong Lei
Keyword(s):  
Total Pressure ◽  
Integral Method ◽  
Pressure Field ◽  
Averaging Method ◽  
Test Scheme ◽  
Test Results ◽  
Ring Segment ◽  
Test Points ◽  
Radial Average ◽  
Ring Boundary

It’s important to measure inlet total pressure field for aeroengine. Firstly, test scheme is discussed. Three pectinate total pressure probes, which can be rotated with an additional straight ring segment around the engine axis, are used to measure the total pressure field. The radial distribution of test points is designed via Tchebycheff integral method. Radial average and circumferential average are calculated according to the field data via area averaging method. At last the total pressure field is visualized via mapping the data to colors. Test results show that the total pressure distribution in main airflow is evener than that in boundary layers and the thickness of inner and outer ring boundary layer can be estimated.

Feasibility investigation of a compressor rotor supported by gas foil bearings with inhomogeneous bump foils

2021 ◽  
pp. 135065012110046
Author(s):  
Hao Li ◽  
Haipeng Geng ◽  
Bo Wang ◽  
Wei Zheng
Keyword(s):  
Critical Speed ◽  
Rotor System ◽  
Experimental Result ◽  
Test Results ◽  
Rotating Speed ◽  
Foil Bearings ◽  
Dynamic Coefficients ◽  
High Order Harmonic ◽  
Compressor Rotor ◽  
Operating Points

In this paper, a rotordynamic experiment on a compressor rotor system is presented and the feasibility of gas foil bearings with inhomogeneous bump foils is verified. A push–pull device is designed to obtain the stiffness curve and the nominal clearance of foil bearings. Operating points and dynamic coefficients of the rotor system at each rotating speed are predicted. In rotordynamic analysis, an alternative model of the impeller is proposed and the critical speed is predicted by employing the finite element method, in which the dynamic coefficients of inhomogeneous foil bearings are taken into account. Compared with the experimental result, the accuracy of the prediction for the critical speed is verified to be about 14% error. Two sets of foil bearings with 22 and 41 μm nominal clearance are manufactured and tested. Test results indicate that the vibration amplitude can be greatly reduced by diminishing the bearing clearance. When foil bearings with 22 μm clearance are used, the high-order harmonic frequencies of rotor vibration are significantly inhibited, and the amplitude of the rotating frequency is obviously restricted. Thus, the foil bearing with inhomogeneous bump foils tested in this paper can meet the speed requirement of the compressor when the nominal clearance is set at 22 μm.

The Research of IC Test Based on LTX-77 Test System

2014 ◽  
Vol 496-500 ◽  
pp. 1176-1179
Author(s):  
Li Tan ◽  
Yu Fang
Keyword(s):  
Test Object ◽  
Test System ◽  
Test Method ◽  
Test Results ◽  
Analog Ic ◽  
Test Platform ◽  
Logic Functions ◽  
Actual Test ◽  
Ic Test

LTX-77 test system is a large IC test system that is used for various kinds of analog IC, digital IC and analog digital mixed IC. It can be used to test DC parameters, AC parameters and logic functions. In the paper, the IC test platform is LTX-77 test system. IC ADC0804 was tested as the test object. The test method of IC is described in the view of actual test. The test results show that the test system is convenient and accurate, which has important practical value for IC manufacturers and users.

The Improved Friction Properties of Bonded MoS2 Films by MAO Treating of Al Substrate

2013 ◽  
Vol 275-277 ◽  
pp. 1911-1914 ◽  
Author(s):  
Han Jun Hu ◽  
Hui Zhou ◽  
Yu Gang Zheng ◽  
Kai Feng Zhang ◽  
Zhi Hua Wan
Keyword(s):  
Tribological Properties ◽  
Solid Lubricants ◽  
Ceramic Coatings ◽  
Test System ◽  
Test Method ◽  
Test Results ◽  
Specimen Test ◽  
Micro Arc Oxidation ◽  
A New Technique ◽  
Porous Microstructures

The bonded MoS2 films are widely used as solid lubricants in aerospace mechanisms due to their excellent tribological properties. Traditionally, the MoS2 was directly bonded on the Al substrate that was only treated by the technique named of sandblast. For improving the tribological properties of MoS2 films, micro arc oxidation (MAO) instead of sandblast was introduced as a new technique for treating of Al substrate. In this article, the tribological properties of MoS2 films which were bonded on different surface of Al substrate as mentioned above were discussed, respectively. It was concluded from the test results that the MoS2 films bonded on substrate treated by MAO have better tribological properties than those samples treated by sandblast. The endurance life against abrasion of the former is as high as twenty times of the latter by the stand test method of ball on disk using the UMT Multi-Specimen Test System. This test results could be illustrated by the following reasons. The first is the porous microstructures of MAO ceramic coatings on the Al substrate. The coatings have numerous pits to be good at increasing the binding force with the MoS2 films, and the pits can also provide a MoS2 lubricants reservoir during processes of friction. Both of them improved the MoS2 film’s ability of wear-protective. The second is that hardness of the coating is higher than the Al, and this ensures well wearing resistance, especially in practical application to big load-supporting moving parts, such as bearing, gear, etc…

Study on Conventional Domed Bursting Disc Material and Burst Pressure Test

2013 ◽  
Vol 690-693 ◽  
pp. 2371-2378
Author(s):  
Wei Pu Xu ◽  
Yi Ting Liu
Keyword(s):  
Stainless Steel ◽  
Tensile Test ◽  
316L Stainless Steel ◽  
Performance Test ◽  
Test Method ◽  
Burst Pressure ◽  
Test Results ◽  
Manufacturing Method ◽  
Pressure Test ◽  
Disc Material

A brief overview is given in the conventional domed bursting disc structure and manufacturing method. 316L stainless steel as a template is selected. With the investigation on bursting disc material tensile test method, the test results are summarized,also the burst results of disc burst pressure in different sizes. With the help of bursting disc material performance test and bursting disc burst pressure test of 316L , the test results provide a reference for other types of bursting disc.

scholarly journals Hedonic Test Method for Measuring Instant Pindang Seasoning Powder Preferences

2019 ◽  
Vol 3 (1) ◽  
pp. 34
Author(s):  
Dea Tio Mareta
Keyword(s):  
Test Method ◽  
Test Results ◽  
Drying Method ◽  
Typical Food ◽  
Hedonic Scale

Instant seasoning for cooking are commonly known by people who want something practical. Pindang is a typical food of Lampung and South Sumatra Province, consisting of various spices and herbs. Instant pindang seasoning powder made with foam mat drying method using 3 varations of foam additives. The purpose of this study was to determine the level of taste, aroma, and color of instant pindang seasoning powder made with three variations of foam additives, namely 5% (w/w), 10% (w/w), and 15% (w/w). The hedonic test for instant pindang seasoning powder were carried out on 35 panelists. Panelists were faced with 3 samples with 3 different sample numbers. Panelists were asked to assess how much preference for seasoning products using hedonic scale. The hedonic test results showed that, with the addition of 15% (w/w) foam is preferred in terms of color. As for aroma and taste, there were no significant differences between the three products. Keywords: foam mat drying , hedonic test, instant pindang seasoning powder, pindang

scholarly journals PENDIDIKAN KARAKTER MELALUI PEMBELAJARAN MATEMATIKA

2014 ◽  
Vol 10 (1) ◽  
Author(s):  
Salafudin *
Keyword(s):  
Statistical Analysis ◽  
Character Education ◽  
Sampling Technique ◽  
Problem Formulation ◽  
Test Method ◽  
Cluster Sampling ◽  
Test Results ◽  
Learning Mathematics ◽  
Character Building ◽  
Better Than

This study aimed to determine: (1) how was the design of character building by learning mathematics, and (2) whether the character building by learning mathematics could produce better learning outcome of mathematics than conventional mathematics learning.To answer these two questions, I used Research and Development ( R & D ) which consists of a preliminary study to obtain preliminary data on student learning outcomes before being given treatments of character building by learning mathematics. The next phase is the design of the character building by learning mathematics. Further testing and revision in class and repeated until it found the best learning model. From the first problem formulation, qualitative data analysis, such as the design of character building in learning mathematics was produced. The results of the qualitative analysis shows, character building by learning mathematics was quite effectively applied to implant positive character in students. To answer the second question, statistical analysis was used. The population in this study was all students of class VII of MTsN in Buaran of Pekalongan which totaled 220. By random cluster sampling technique two classes (a class VII A and VII B) was chosen. Class VII A was as an experiment class, and class VII B was as a control class. Data were taken by the test method, experimental classroom observation, and documentation. The data was then processed with an average difference test. Results of statistical analysis obtained t = 3.33 > t table = 1.67. This meant that learning achievement of the students in the experimental class, which was implemented character education in mathematics was better than the students who were taught by conventional methods. Based on these results, it could be conclude that the character building in mathematics was better than the conventional method of learning mathematics.

scholarly journals Design and application of accelerated life test of grating ruler based on step stress loading

2021 ◽  
Vol 336 ◽  
pp. 02027
Author(s):  
Jili Wang ◽  
Qingyu Li ◽  
Xiaocui Zhu ◽  
Cheng Gao ◽  
Yi Li ◽  
...  
Keyword(s):  
Weibull Distribution ◽  
Test Method ◽  
Accelerated Life Test ◽  
Test Scheme ◽  
Life Test ◽  
Test Device ◽  
Typical Application ◽  
Accelerated Life ◽  
Life Model ◽  
Accelerated Life Model

Combined with the actual project, a grating ruler accelerated life test device is designed, which can simulate the actual loads, including temperature, humidity and speed stress. An accelerated life test scheme based on stepped stress loading is proposed, and 6 grating rulers are tested based on time-censored test method. An accelerated life model based on Weibull distribution used for evaluating the lifetime is established. Related experimental techniques also can be typical application cases for innovative practical teaching.

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