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Volume ratio and pressure drop on hydraulic dynamic pressure calibration system
Afaqul Zafer,Sanjay Yadav,Arif Sanjid,Lalit Kumar,Raman Kumar Sharma 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
The calibration of a pressure transducer that works in dynamic conditions is an unavoidable challenge. To address this challenge, an experimental setup has been designed and developed to simultaneously generate and calibrate the dynamic pressure. The system mainly comprises a pressure chamber that accommodates a step pressure generator and test chamber with a quick open valve and pressure sensor under calibration. Accordingly, an aperiodic type of step pressure generator with a quick open valve is particularly designed. This instrument can generate a positive step pressure with a rise time of up to 11 ms and a negative step pressure with a fall time of up to 12 ms within a working pressure range from the atmospheric pressure to 200 MPa. The volume ratio of the test chamber to the pressure chamber and its effect on pressure drop is critical in such systems. The effect of volume ratio on the dynamic performance parameters, namely, rise/fall time, is explored and inferences for optimizing these parameters are derived. A mathematical model for pressure drop in the test chamber has been developed and validated to precisely determine the magnitude of the step pressure input. Lastly, the experimental study of the effect of volume ratio on pressure drop has been conducted to diminish the pressure drop, thereby minimizing the uncertainty.
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Afaqul Zafer,Sanjay Yadav 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.6
Development of strain gauge based pressure transducers is very common but its development in high pressure range without sacrificing cost effectiveness and design simplicity is a challenge. While keeping this perspective, we have discussed the development of strain gauge based hydraulic pressure transducer working up to pressure of 500 MPa. The present paper describes the different design stages bearing own challenges and feasible solutions. For design considerations, stress analysis has been performed by using finite element method (FEM). A mathematical modeling is developed for determining the sensitivity of the transducer and is validated with the experimental results. We have also introduced the concept of using autofrettage technique first time in pressure transducer design and its validity for effectiveness in the proposed design is performed with the help of the finite element analysis which reveals that the autofrettage of sensing element, not only increase the pressure bearing capacity of the transducer but also improve the sensitivity. Finally, we have performed the calibration and performance testing experiments on this newly manufactured transducer which shows good linearity (R2=0.999), minimal hysteresis (0.18% of full scale), minimal short term repeatability (0.32% of full scale) and an overall accuracy better than 1% of full scale.
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