Design, performance evaluation and analysis of the inlet tube of pressure sensor for chamber pressure measurement

Sensor Review ◽  
2019 ◽  
Vol 39 (4) ◽  
pp. 612-621
Author(s):  
K. Gobi ◽  
B. Kannapiran ◽  
D. Devaraj ◽  
K. Valarmathi
Keyword(s):  
Performance Evaluation ◽  
Pressure Sensor ◽  
Chamber Pressure ◽  
Dynamic Calibration ◽  
Test Environment ◽  
Content Type ◽  
Static Test ◽  
Inlet Tube ◽  
Pressure Peak ◽  
Type Pressure

Purpose In Aerospace applications, the inlet tubes are used to mount strain gauge type pressure sensors on the engine under static test to measure engine chamber pressure. This paper aims to focus on the limitations of the inlet tube and its design aspects to serve better in the static test environment. The different sizes of the inlet tubes are designed to meet the static test and safety requirements. This paper presents the performance evaluation of the designed inlet tubes with calibration results and the selection criteria of the inlet tube to measure combustion chamber pressure with the specified accuracy during static testing of engines. Design/methodology/approach Two sensors, specifically, one cavity type pressure sensor with the inlet tube of range 0-6.89 MPa having natural frequency of the diaphragm 17 KHz and another flush diaphragm type pressure sensor of the same range having −3 dB frequency response, 5 KHz are mounted on the same pressure port of the engine under static test to study the shortcomings of the inlet tube. The limitations of the inlet tube have been analyzed to aid the tube design. The different sizes of inlet tubes are designed, fabricated and tested to study the effect of the inlet tube on the performance of the pressure sensor. The dynamic calibration is used for this purpose. The dynamic parameters of the sensor with the designed tubes are calculated and analyzed to meet the static test requirements. The diaphragm temperature test is conducted on the representative hardware of pressure sensor with and without inlet tube to analyze the effect of the inlet tube against the temperature error. The inlet tube design is validated through the static test to gain confidence on measurement. Findings The cavity type pressure sensor failed to capture the pressure peak, whereas the flush diaphragm type pressure sensor captured the pressure peak of the engine under a static test. From the static test data and dynamic calibration results, the bandwidth of cavity type sensor with tube is much lower than the required bandwidth (five times the bandwidth of the measurand), and hence, the cavity type sensor did not capture the pressure peak data. The dynamic calibration results of the pressure sensor with and without an inlet tube show that the reduction of the bandwidth of the pressure sensor is mainly due to the inlet tube. From the analysis of dynamic calibration results of the sensor with the designed inlet tubes of different sizes, it is shown that the bandwidth of the pressure sensor decreases as the tube length increases. The bandwidth of the pressure sensor with tube increases as the tube inner diameter increases. The tube with a larger diameter leads to a mounting problem. The inlet tube of dimensions 6 × 4 × 50 mm is selected as it helps to overcome the mounting problem with the required bandwidth. From the static test data acquired using the pressure sensor with the selected inlet tube, it is shown that the selected tube aids the sensor to measure the pressure peak accurately. The designed inlet tube limits the diaphragm temperature within the compensated temperature of the sensor for 5.2 s from the firing of the engine. Originality/value Most studies of pressure sensor focus on the design of a sensor to measure static and slow varying pressure, but not on the transient pressure measurement and the design of the inlet tube. This paper presents the limitations of the inlet tube against the bandwidth requirement and recommends dynamic calibration of the sensor to evaluate the bandwidth of the sensor with the inlet tube. In this paper, the design aspects of the inlet tube and its effect on the bandwidth of the pressure sensor and the temperature error of the measured pressure values are presented with experimental results. The calibration results of the inlet tubes with different configurations are analyzed to select the best geometry of the tube and the selected tube is validated in the static test environment.

Design, development and performance evaluation of pressure sensor using eddy current displacement sensing coil

Sensor Review ◽  
2018 ◽  
Vol 38 (2) ◽  
pp. 248-258
Author(s):  
Gobi K. ◽  
Kannapiran B. ◽  
Devaraj D. ◽  
Valarmathi K.
Keyword(s):  
Performance Evaluation ◽  
Eddy Current ◽  
Pressure Sensor ◽  
Strain Gauge ◽  
Pressure Sensors ◽  
Calibration Data ◽  
Position Measurement ◽  
Content Type ◽  
Short Period ◽  
Type Pressure

Purpose The conventional strain gauge type pressure sensor suffers in static testing of engines due to the contact transduction method. This paper aims to focus on the concept of non-contact transduction-based pressure sensor using eddy current displacement sensing coil (ECDS) to overcome the temperature limitations of the strain gauge type pressure sensor. This paper includes the fabrication of prototypes of the proposed pressure sensor and its performance evaluation by static calibration. The fabricated pressure sensor is proposed to measure pressure in static test environment for a short period in the order of few seconds. The limitations of the fabricated pressure sensor related to temperature problems are highlighted and the suitable design changes are recommended to aid the future design. Design/methodology/approach The design of ECDS-based pressure sensor is aimed to provide non-contact transduction to overcome the limitations of the strain gauge type of pressure sensor. The ECDS is designed and fabricated with two configurations to measure deflection of the diaphragm corresponding to the applied pressure. The fabricated ECDS is calibrated using a standard micro meter to ensure transduction within limits. The fabricated prototypes of pressure sensors are calibrated using dead weight tester, and the calibration results are analyzed to select the best configuration. The proposed pressure sensor is tested at different temperatures, and the test results are analyzed to provide recommendations to overcome the shortcomings. Findings The performance of the different configurations of the pressure sensor using ECDS is evaluated using the calibration data. The analysis of the calibration results indicates that the pressure sensor using ECDS (coil-B) with the diaphragm as target is the best configuration. The accuracy of the fabricated pressure sensor with best configuration is ±2.8 per cent and the full scale (FS) output is 3.8 KHz. The designed non-contact transduction method extends the operating temperature of the pressure sensor up to 150°C with the specified accuracy for the short period. Originality/value Most studies of eddy current sensing coil focus on the displacement and position measurement but not on the pressure measurement. This paper is concerned with the design of the pressure sensor using ECDS to realize the non-contact transduction to overcome the limitations of strain gauge type pressure sensors and evaluation of the fabricated prototypes. It is shown that the accuracy of the proposed pressure sensor is not affected by the high temperature for the short period due to non-contact transduction using ECDS.

Noninvasive Monitoring of Arterial Viscoelastic Indices Using a Foil-type Pressure Sensor

2011 ◽  
Vol 131 (9) ◽  
pp. 1518-1527
Author(s):  
Hiromi Maruyama ◽  
Harutoyo Hirano ◽  
Abdugheni Kutluk ◽  
Toshio Tsuji ◽  
Osamu Fukuda ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Noninvasive Monitoring ◽  
Type Pressure

Public administration approach

2014 ◽  
Vol 35 (6/7) ◽  
pp. 495-507 ◽  
Author(s):  
Jurgita Rudžionienė ◽  
Jaroslav Dvorak
Keyword(s):  
Performance Evaluation ◽  
Public Administration ◽  
Information Services ◽  
Evidence Based ◽  
Economic Aspects ◽  
Content Type ◽  
Evaluation Functions ◽  
Services Evaluation ◽  
Library Evaluation ◽  
Evaluation Measurement

Purpose – The purpose of this paper is to define the problem and to initiate discussion on library evaluation as significant part of institutional evidence-based management from public administration approach. Design/methodology/approach – In order to fulfilling the purpose, special attention to present the concepts of valuing information, library performance evaluation, measurement, etc. is drawn, main evaluation functions are analysed. Economic aspects of information services vs intellectual ones are discussed. Consistent patterns and principles of public administration as well as possibilities of public administration influence in creation of systematic base of library performance evaluation as well as of information services impact to the user are analysed. Findings – The paper provides insights about different aspects of information services evaluation. Results of analysis of economic aspects of information services vs intellectual ones are presented, consistent patterns and principles of public administration, possibilities of public administration influence in creation of systematic base of library performance evaluation as well as of information services impact to the user possibilities are presented. Originality/value – The paper fulfills need to study how public administration could involve library evaluation as tool for evidence-based decision making.

Modeling and Calculation of Initial Ignition Gas Pressure Flow through the Rigid Porous Media in 100 mm Ignition Simulator

2012 ◽  
Vol 560-561 ◽  
pp. 1103-1113
Author(s):  
Zheng Gang Xiao ◽  
Wei Dong He ◽  
San Jiu Ying ◽  
Fu Ming Xu
Keyword(s):  
Porous Media ◽  
Gas Flow ◽  
Ceramic Composite ◽  
Peak Position ◽  
Chamber Pressure ◽  
Lateral Side ◽  
Physical Processes ◽  
Local Permeability ◽  
Pressure Peak ◽  
Flow Through

To acquire better understanding of the early ignition phenomena in 100mm ignition simulator loaded with packed propellant bed, a theoretical model of ignition gas flow through rigid porous media is developed. Three pressure gauges are installed in the lateral side of ignition simulator for chamber pressure measurements after ignition. The pseupropellant loaded in the chamber is similar to the standard 13/19 single-base cylindrical propellant in size. It is composed of rigid ceramic composite with low thermo conductivity. It is assumed that the pseupropellant bed is rigid in contrast to the previous elastic porous media assumption. The calculated pressure values can be verified by the experimental data well at the low loading density of pseupropellant bed of 0.18 g/cm3. However, there is still error between the experimental and calculated results in the early pressure peak position close to the ignition primer when the loading density of pseupropellant bed increases to 0.73 and 1.06g/cm3, due to the change of local permeability of pseupropellant bed at high loading density, which is assumed a constant in the model for the modeling easily. The calculations can enable better understanding of physical processes of ignition gas flow in the ignition simulator loaded with the pseupropellant bed.

Evaluating the performance of destination marketing systems (DMS): stakeholder perspective

2014 ◽  
Vol 32 (2) ◽  
pp. 208-231 ◽  
Author(s):  
Marianna Sigala
Keyword(s):  
Performance Evaluation ◽  
Destination Marketing ◽  
Collaborative Culture ◽  
Public And Private ◽  
Content Type ◽  
Stakeholder Perspective ◽  
Marketing Systems ◽  
Public And Private Stakeholders ◽  
Social Environmental ◽  
Nation Wide Survey

Purpose – Destination marketing systems (DMS) represent a vital inter-organisational information system (IOIS) for supporting the collaborative e-marketing strategies of tourism firms and the competitiveness of tourism destinations. However, many DMS have failed to deliver the expected outcomes, while the performance measurement of DMS has not been thoroughly investigated in the literature so far. The study synthesises research from the fields of DMS, IOIS and collaborative practices for investigating the perceptions of various tourism DMS stakeholders about the evaluation of DMS performance. The paper aims to discuss these issues. Design/methodology/approach – The study conducted a nation-wide survey for measuring the perceptions of various tourism DMS stakeholders in Greece about the importance of the roles that DMS should serve as well as the items that should be used for measuring the performance of these DMS’ roles. Findings – The findings showed that the public and private stakeholders held different perceptions about the roles of DMS as well as about the metrics that need to be used for evaluating DMS performance. The findings also showed that the perceptions that stakeholders hold about the roles of the DMS influence their perceptions about the performance evaluation of DMS. Research limitations/implications – The findings are based on evaluating a specific type of IOIS and sector/context. Thus, caution is required in generalising the results to other types of IOIS and social/environmental contexts. Practical implications – The study highlighted that the performance and success of DMS, and of IOIS projects in general, require the nurturing of a collaborative culture and the co-ordination of the various stakeholders’ perceptions and interests. Originality/value – The study addresses the gap in DMS performance evaluation and it contributes to the literature about IOIS evaluation by adopting a stakeholders approach.

The X factor that can help to motivate Generation Y

2015 ◽  
Vol 23 (1) ◽  
pp. 32-34 ◽  
Author(s):  
S.S. Sreejith
Keyword(s):  
Information Technology ◽  
Performance Evaluation ◽  
Evaluation System ◽  
Evaluation Criteria ◽  
Recognition System ◽  
Information Technology Workers ◽  
Content Type ◽  
Performance Evaluation System ◽  
Evaluation Systems ◽  
Effective Performance

Purpose – Explains why performance evaluation designed for manufacturers is inappropriate for information technology organizations. Design/methodology/approach – Underlines the distinctiveness of the information technology workforce and provides the basis for an effective performance- evaluation system designed for these workers. Findings – Highlights the roles of consensus and transparency in setting and modifying evaluation criteria. Practical implications – Urges the need for a fair and open rewards and recognition system to run in parallel with reformed performance evaluation. Social implications – Provides a way of updating performance evaluation systems to take account of the move from manufacturing to information technology-based jobs in many developed and developing societies. Originality/value – Reveals how best to recognize, reward and assess the performance of information technology workers.

Investigation of Interface Oil Insufficiency in a Strain Gauge Type Pressure Sensor

2022 ◽  
Vol 23 (1) ◽  
Author(s):  
Kamran Soltani ◽  
Ghader Rezazadeh ◽  
Manus Henry ◽  
Oleg Bushuev
Keyword(s):  
Pressure Sensor ◽  
Strain Gauge ◽  
Type Pressure

Imprecise DEA framework for evaluating health-care performance of districts

Kybernetes ◽  
2017 ◽  
Vol 46 (4) ◽  
pp. 706-727 ◽  
Author(s):  
E. Ertugrul Karsak ◽  
Melis Almula Karadayi
Keyword(s):  
Health Care ◽  
Performance Evaluation ◽  
Health Care Organizations ◽  
Health Sector ◽  
Evaluation Methodology ◽  
Policy Makers ◽  
Content Type ◽  
Relative Evaluation ◽  
Health Care Performance ◽  
Care Performance

Purpose This paper aims to address performance measurement in the health-care sector, which gains increasing importance for most countries because growing health expenditures and increased quality and competition in the health sector require hospitals to use their resources efficiently. Health policy-makers and health-care managers stress the need for developing a robust performance evaluation methodology for health-care organizations. Design/methodology/approach This paper presents an imprecise data envelopment analysis (DEA) framework for evaluating the health-care performance of 26 districts in Istanbul, a metropolis with nearly 15 million inhabitants. The proposed methodology takes into account both quantitative and qualitative data represented as linguistic variables for performance evaluation. Moreover, this study reckons that weight flexibility in DEA assessments can lead to unrealistic weighting schemes for some inputs and outputs, which are likely to result in overstated efficiency scores for a number of decision-making units (in here, districts). To overcome this problem, a weight restricted imprecise DEA model that constrains weight flexibility in DEA is proposed. Findings The proposed imprecise DEA approach sets forth a more realistic decision methodology for evaluating the relative health-care performance and also enables to determine the best district in terms of health-care performance in Istanbul. Originality/value This paper includes the quality dimension, which has been overlooked in previous studies, into the health-care performance evaluation of districts. Moreover, it circumvents unrealistic weight flexibility which may distort the relative evaluation of health-care performance.

scholarly journals Complex conductivity reconstruction in multiple frequency electrical impedance tomography for fabric-based pressure sensor

Sensor Review ◽  
2015 ◽  
Vol 35 (1) ◽  
pp. 85-97 ◽  
Author(s):  
C.L. Yang ◽  
A. Mohammed ◽  
Y Mohamadou ◽  
T. I. Oh ◽  
M. Soleimani
Keyword(s):  
Electrical Impedance Tomography ◽  
Pressure Sensor ◽  
Electrical Impedance ◽  
Pressure Sensors ◽  
Complex Impedance ◽  
Electrical Impedance Spectroscopy ◽  
Multiple Frequency ◽  
Impedance Tomography ◽  
Content Type ◽  
Pressure Mapping

Purpose – The aim of this paper is to introduce and to evaluate the performance of a multiple frequency complex impedance reconstruction for fabric-based EIT pressure sensor. Pressure mapping is an important and challenging area of modern sensing technology. It has many applications in areas such as artificial skins in Robotics and pressure monitoring on soft tissue in biomechanics. Fabric-based sensors are being developed in conjunction with electrical impedance tomography (EIT) for pressure mapping imaging. This is potentially a very cost-effective pressure mapping imaging solution in particular for imaging large areas. Fabric-based EIT pressure sensors aim to provide a pressure mapping image using current carrying and voltage sensing electrodes attached on the boundary of the fabric patch. Design/methodology/approach – Recently, promising results are being achieved in conductivity imaging for these sensors. However, the fabric structure presents capacitive behaviour that could also be exploited for pressure mapping imaging. Complex impedance reconstructions with multiple frequencies are implemented to observe both conductivity and permittivity changes due to the pressure applied to the fabric sensor. Findings – Experimental studies on detecting changes of complex impedance on fabric-based sensor are performed. First, electrical impedance spectroscopy on a fabric-based sensor is performed. Secondly, the complex impedance tomography is carried out on fabric and compared with traditional EIT tank phantoms. Quantitative image quality measures are used to evaluate the performance of a fabric-based sensor at various frequencies and against the tank phantom. Originality/value – The paper demonstrates for the first time the useful information on pressure mapping imaging from the permittivity component of fabric EIT. Multiple frequency EIT reconstruction reveals spectral behaviour of the fabric-based EIT, which opens up new opportunities in exploration of these sensors.

Sign in / Sign up

Export Citation Format

Share Document