Impact of calibration technique on measurement accuracy for the JET core charge-exchange system

Abstract This paper presents possible use of results of exhaust gas composition testing of self - ignition engine for technical state assessment of its charge exchange system under assumption that there is strong correlation between considered structure parameters and output signals in the form of concentration of toxic compounds (ZT) as well as unambiguous character of their changes. Concentration of the analyzed ZT may be hence considered to be symptoms of engine technical state. At given values of the signals and their estimates it is also possible to determine values of residues which may indicate a type of failure. Available tool programs aimed at analysis of experimental data commonly make use of multiple regression model which allows to investigate effects and interaction between model input quantities and one output variable. Application of multi-equation models provides great freedom during analysis of measurement data as it makes it possible to simultaneously analyze effects and interaction of many output variables. It may be also implemented as a tool for preparation of experimental material for other advanced diagnostic tools such as neural networks which, in contrast to multi-equation models, make it possible to recognize a state at multistate classification and - in consequence - to do diagnostic inference. Here , these authors present merits of application of the above mentioned analytical tools on the example of tests conducted on an experimental engine test stand.

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An Improved Calibration Technique for MEMS Accelerometer-Based Inclinometers

Sensors ◽

10.3390/s20020452 ◽

2020 ◽

Vol 20 (2) ◽

pp. 452 ◽

Cited By ~ 1

Author(s):

Jiaxin Zhu ◽

Weifeng Wang ◽

Shiping Huang ◽

Wei Ding

Keyword(s):

Measurement Accuracy ◽

Micro Electro Mechanical System ◽

Calibration Model ◽

Beam Model ◽

Parameter Calibration ◽

Calibration Technique ◽

Civil Structures ◽

Mems Accelerometer ◽

Validation Experiment ◽

Key Parameter

Micro-electro-mechanical system (MEMS) accelerometer-based inclinometers are widely used to measure deformations of civil structures. To further improve the measurement accuracy, a new calibration technique was proposed in this paper. First, a single-parameter calibration model was constructed to obtain accurate angles. Then, an image-processing-based method was designed to obtain the key parameter for the calibration model. An ADXL355 accelerometer-based inclinometer was calibrated to evaluate the feasibility of the technique. In this validation experiment, the technique was proven to be reliable and robust. Finally, to evaluate the performance of the technique, the calibrated MEMS inclinometer was used to measure the deflections of a scale beam model. The experimental results demonstrate that the proposed technique can yield accurate deformation measurements for MEMS inclinometers.

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Sixty keV D/sup -/ beams using double charge-exchange system

10.2172/5239310 ◽

1977 ◽

Cited By ~ 1

Author(s):

E.B. Jr. Hooper ◽

O.A. Anderson ◽

T.J. Orzechowski ◽

P. Poulsen

Keyword(s):

Charge Exchange ◽

Exchange System ◽

Double Charge Exchange ◽

Double Charge

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Use of Network Analyzer and Coaxial Probe to Determine Complex Permittivity

MRS Proceedings ◽

10.1557/proc-189-123 ◽

1990 ◽

Vol 189 ◽

Cited By ~ 3

Author(s):

David Blackham

Keyword(s):

Network Analysis ◽

Complex Permittivity ◽

Measurement Accuracy ◽

Coaxial Line ◽

Vector Network Analyzer ◽

Network Analyzer ◽

Calibration Technique ◽

Non Destructive ◽

Coaxial Probe

ABSTRACTA vector network analyzer combined with an open ended coaxial probe provides a way to make non-destructive measurements of complex permittivity. These measurements can be made on both solids and liquids.Many authors have done work on using an open ended coaxial line for making these measurements[1][2][3]. They have presented different techniques for modelling the coaxial probe. This paper does not focus on the area of modelling, but deals instead with the use of a vector network analyzer and coaxial probe in making measurements. To enhance measurement accuracy, the technique described adapts a calibration technique currently in use in vector network analysis.An HP 8720B vector network analyzer was used for the development and measurements presented in this paper.

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Identification of service failures of cylinder valves of ship piston combustion engines

Polish Maritime Research ◽

10.2478/v10012-007-0009-x ◽

2007 ◽

Vol 14 (2) ◽

pp. 19-26

Author(s):

Zbigniew Korczewski

Keyword(s):

Charge Exchange ◽

Theoretical Background ◽

Combustion Engines ◽

Exchange System ◽

Wear Process ◽

Service Failures ◽

Diagnostic Problems

Identification of service failures of cylinder valves of ship piston combustion engines This paper presents selected diagnostic problems of charge exchange system of ship piston combustion engines. Theoretical background of wear process of cylinder valves was highlighted in the aspect of identification and sources of known and identifiable states of unserviceability. The presented results of endoscopic examinations concern failures of cylinder valves of the engines installed on Polish Navy ships.

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