Notice of Retraction: Design of C Language On-Line Study and Test System Based on Web

2009 ◽  
Author(s):  
Wen X.L.
Keyword(s):  
Test System ◽  
C Language ◽  
On Line

Disquisition of Testing System for BMBS Vacuum Booster

2012 ◽  
Vol 190-191 ◽  
pp. 1351-1354
Author(s):  
Yan Shi ◽  
Yi Lu ◽  
Xue Ying Wang
Keyword(s):  
High Speed ◽  
Computer Control ◽  
Performance Testing ◽  
Test System ◽  
Testing System ◽  
Test Items ◽  
Sealing Performance ◽  
On Line ◽  
High Speed Data ◽  
Line Test

To solve the problem of testing BMBS (BLOW-OUT MONITORING AND BRAKE SYSTEM) vacuum booster performance, a double-station and on-line test system for BMBS vacuum booster was designed. It adopts high-speed data collection method and computer control technology. This system can test the performance in non-BMBS condition and BMBS condition. The test items mainly include dynamic characteristic and sealing performance under each condition. The double stations are independent and have no interference with each other. The system fills up the blank of performance testing about BMBS vacuum booster. To verify this system, experiments were conducted with the vacuum booster which installed the BMBS technology. The experiment results show that the system can do well in testing the performance of BMBS vacuum booster in high precision. The sealing performance resolution is 0.01kPa and the pressure resolution is 1N.

On-Line Test System for Vibration Measurement and Sorting of Ball Bearings

2010 ◽  
Vol 437 ◽  
pp. 502-506 ◽  
Author(s):  
Yu Xue Chen ◽  
Jian Liu
Keyword(s):  
Test System ◽  
Automatic Testing ◽  
Vibration Measurement ◽  
Ball Bearings ◽  
Abnormal Sound ◽  
Line Measurement ◽  
Vibration Model ◽  
On Line ◽  
Vibration Parameters ◽  
And Control

A system for on-line measurement and sorting of ball bearings is presented in this paper. The structures and functions of its automatic testing mechanics and control system are described in detail. The system sorts the tested bearings into four grades by measured values of vibration parameters such as root-mean-square value, peak value, crest factor and kurtosis. Its stability of indication values is between ± 1.0 dB. The mechanism generating abnormal sounds of bearings is also investigated emphatically and the characteristics of abnormal sound signals are described on the basis of vibration model of tested bearing.

Partial Discharge Detection of On-Line Cables Based on Hilbert Huang Transform

2014 ◽  
Vol 960-961 ◽  
pp. 759-762
Author(s):  
Fang Li
Keyword(s):  
Spline Interpolation ◽  
Partial Discharge ◽  
Test System ◽  
Practical Significance ◽  
Grid Security ◽  
Hilbert Huang Transform ◽  
Mode Decomposition ◽  
On Line ◽  
Overshoot And Undershoot ◽  
Lock In

Hilbert-Huang transforms calculation method was used in the study on signal of partial discharge from on-line cable. The partial discharge signal was made to be intrinsic mode function (IMF) by empirical mode decomposition (EMD).The cubic spline interpolation was selected as the interpolation function and ideal envelope curve was achieved to eliminates defects such as overshoot and undershoot effectively. Appropriate lock-in amplifier was choosed and pre-amplifier and phase sensitive detection circuit was designed to determine the calculation programs. The results showed that the test system can effectively capture the weak PD signals in cable under complex environmental conditions and the PD signal waveform obtained was improved through Hilbert-Huang transforms.The state of insulation and the remaining life of the cable can be judged effectively,which has practical significance for improving the grid security.

scholarly journals A Novel Pre-Dispatching Strategy of Power System under Extreme Weather

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2112
Author(s):  
Tianen Huang ◽  
Zhenjie Wu ◽  
Yuantao Wang ◽  
Jian Tang ◽  
Xiang Li ◽  
...  
Keyword(s):  
Distribution Network ◽  
Distribution Networks ◽  
Test System ◽  
Power Grids ◽  
Economic Losses ◽  
Power Outage ◽  
Progressive Hedging ◽  
Progressive Hedging Algorithm ◽  
On Line ◽  
The Cost

Pre-dispatch is an important way for distribution networks to cope with typhoon weather, enhance resilience and reduce economic losses. In order to accurately describe the faults and consequences of components’ failure in the distribution network, this paper establishes a pre-dispatch model to cope with typhoon weather based on line failures consequence analysis. First, Monte Carlo simulation is used to sample the typical fault scenarios of vulnerable lines. According to the location of switchgear, the distribution network is partitioned and a block breaker correlation matrix is established. Combined with the line fault status, a fault consequence model of distribution lines related to the pre-dispatching strategy is established. Then, the objective function is given to minimize the sum of the cost of the pre-dispatch operation and the power outage, and then establish a pre-dispatch model for the distribution network. In order to reduce the computational complexity, PH (Progressive Hedging) algorithm is used to solve the model. Finally, the IEEE-69 test system is used to analyze the effectiveness of the method. The results show that the proposed dispatching model can effectively avoid potential risks, reduce system economic losses and improve the resilience of power grids.

CAE Tools as Valid Opportunity to Improve Quality Control Systems Performances for Sheet Metal Formed Components

2008 ◽  
Author(s):  
Antonio Del Prete ◽  
Teresa Primo ◽  
Alfredo Elia
Keyword(s):  
Quality Control ◽  
Control System ◽  
Sheet Metal ◽  
Process Simulation ◽  
A Priori ◽  
Test System ◽  
Forming Process ◽  
Forming Simulation ◽  
On Line ◽  
Simulation Results

The numerical simulation of the forming process is a consolidated technique to verify, a priori, the effectiveness of the designed “method” to realize components obtained by sheet metal forming. As it is used in the industrial field at present, the limit of the forming simulation is that simulation results are based on an initial hypothesis that isn’t really true, that is on the hypothesis that the forming process is deterministic. Facts prove such affirmation is wrong considering that each input variable/datum of the simulation is non-deterministic by definition [1]. Therefore, a more realistic approach that uses the process simulation should consider this uncertainty by treating the process parameters as uncertain in an admissible domain. The authors are, at the moment, engaged in the development of an on line control and test system based on acquisition modules composed by a laser and two CCD video cameras. Its aim is to allow the statistical monitoring of the forming process through the investigation of the produced parts, and to point out, with a sufficient confidence level, situations of incipient process drift. The sampling frequency is 1, 2 parts per minute depending on the part main dimensions, therefore an express loading system of the part has been designed without clamps adoption [2]. The support provided by the non-deterministic simulation to the on line control system is very important. In fact, in the first phase of the production screening, for each produced part it allows to verify the areas that have a higher “risk” of defect on the basis of the simulation results. Moreover, as well as the simulation supplies useful suggestions on the areas of each piece at top priority where the quality control is executed, the quality control system can also provide interesting information for the non-deterministic process simulation system, thanks to the data and the measurements carried out on line, in order to increase the numerical-experimental correlation of the designed control system.

On-line Adaptive and Intelligent Distance Relaying Scheme for Power Network

2015 ◽  
Vol 16 (5) ◽  
pp. 473-489
Author(s):  
Rahul Dubey ◽  
S. R. Samantaray ◽  
B. K. Panigrahi ◽  
G. V. Venkoparao
Keyword(s):  
Power Systems ◽  
Transmission Lines ◽  
Model Updating ◽  
Test System ◽  
Operating Conditions ◽  
Power Network ◽  
Parallel Transmission ◽  
On Line ◽  
Distance Relaying ◽  
Learning Machine

Abstract The paper presents an on-line sequential extreme learning machine (OS-ELM) based fast and accurate adaptive distance relaying scheme (ADRS) for transmission line protection. The proposed method develops an adaptive relay characteristics suitable to the changes in the physical conditions of the power systems. This can efficiently update the trained model on-line by partial training on the new data to reduce the model updating time whenever a new special case occurs. The effectiveness of the proposed method is validated on simulation platform for test system with two terminal parallel transmission lines with complex mutual coupling. The test results, considering wide variations in operating conditions of the faulted power network, indicate that the proposed adaptive relay setting provides significant improvement in the relay performance.

Study on Special Vehicle’s Handling Stability by Test Technology

2014 ◽  
Vol 623 ◽  
pp. 3-9
Author(s):  
Yuan Zhao ◽  
Hong Jie Cheng ◽  
Yan Liu ◽  
Zhao Jun Wu
Keyword(s):  
Detection System ◽  
Test System ◽  
Test Method ◽  
Steering Wheel ◽  
Fast Evaluation ◽  
The Road ◽  
Circular Test ◽  
Special Vehicle ◽  
On Line ◽  
Ground Test

According to handling stability problem in using process of special vehicle, its evaluation test method is researched and analyzed. Referring to national profession norm, the on-line detection system of handling stability of special vehicle is constructed, and the design idea of evaluation software is also illustrated. Finally, based on the constructed testing system, the proving ground test of special vehicle is carried out, including the transient response test of steering wheel impulse input, the test of steering wheel returnability, and the steady static circular test. The test results indicate the feasibility and validity of the constructed test system, which provides technical support for detection on-line and fast evaluation of handling stability of special vehicle in riding process, and enhance the road safety during the riding process of missile weapon system.

Analysis of Spindle Rotary Precision Based on Two-Point Methods

2014 ◽  
Vol 624 ◽  
pp. 327-331
Author(s):  
Feng Lu ◽  
Hong Bo Shen ◽  
Xiao Fei Zhang ◽  
Li Xiu Zhang ◽  
Yu Hou Wu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Test System ◽  
Current Sensor ◽  
Experimental Basis ◽  
Dynamic Measurements ◽  
Motorized Spindle ◽  
Rotational Error ◽  
Spindle Rotation ◽  
On Line ◽  
Error Method

Two-point method designed of the test system for application, the precision of the motorized spindle rotation was dynamic measurements. The system consists of standard bars, high-precision non-contact eddy current sensor. Analyzed by a mathematical model to establish error separation, measurement of two spindle rotation accuracy. The use of two isolated error method for processing the experimental data obtained spindle rotation accuracy at different speeds. Studies have shown that when the spindle speed of 10,000 rpm rotational error is small and tends to be more stable. Identify the factors that affect the accuracy of spindle rotation and summarized. Spindle rotation accuracy on-line monitoring and speed control provides an important theoretical, experimental basis.

Transmission Congestion Management and Pricing in Simple Auction Electricity Markets

2004 ◽  
Vol 1 (1) ◽  
Author(s):  
Claudio A Canizares ◽  
Hong Chen ◽  
Federico Milano ◽  
Ajit Singh
Keyword(s):  
Electricity Markets ◽  
Congestion Management ◽  
Test System ◽  
Transmission System ◽  
Price Transmission ◽  
Demand Side ◽  
Transmission Congestion ◽  
Inelastic Demand ◽  
On Line ◽  
Bus Voltage

This paper presents a novel technique to analyze, manage and price transmission congestion in electricity markets based on a simple auction mechanism. The proposed technique is basically an iterative rescheduling algorithm, relying on an ``on-line'' evaluation of the transmission system congestion, as defined by a System Security Index (SSI), and associated sensitivities, which are all computed based on formulas that account for voltage stability constraints as well as thermal and bus voltage limits. The methodology is tested using a 3-area test system, a 6-bus test system with both demand-side bidding and inelastic demand, as well as a 129-bus model of the Italian High Voltage transmission system with demand-side bidding. The results obtained for these test systems with the proposed technique are compared with similar results obtained from an optimization-based method.

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