• Title/Summary/Keyword: Pressure transducer

Search Result 326, Processing Time 0.083 seconds

A study on dynamic characteristics in extension tube and correction of pressure distortion for a S/P type pressure transducer (스파크 플러그형 압력센서에서 연결관로의 동적특성과 압력왜곡의 보상에 관한 연구)

  • 한승국;김승수
    • Journal of the korean Society of Automotive Engineers
    • /
    • v.13 no.3
    • /
    • pp.32-42
    • /
    • 1991
  • In SI engine research the pressure data in cylinder is the most important fundamental ones leading to engine efficiencies and performances. It is, therefore, necessary to obtain accurate pressure data and yet it is often impossible to install a reliable data producing, flush-mounted type pressure transducer in a cylinder of small and medium size multicylinder SI engines. When flush mounting the transducer is not possible, the spark-plug type pressure transducer is commonly used as an alternative. In this case, the transmission tube of spark-plug type pressure transducer introduces distortions in the pressure signal. Efforts were made to understand the dynamic characteristics of spark-plug pressure transducer by shock tube tests and real engine experiments. In engine experiment the cylinder pressure data were simultaneously obtained by both flush mounted and spark-plug type pressure transducers of certain transmission tube geometry. Those pressure data collected by spark-plug type pressure transducer were tested for correction to flush mounted ones by the application of transfer function. As a result of the calibration the IMEP difference between F/M data and improved S/P data was shown to be corrected about 75-98% from the original ones.

  • PDF

Optimal Structural Design of a Tonpilz Transducer Considering the Characteristic of the Impulsive Shock Pressure (충격 특성을 고려한 Tonpilz 변환기의 최적구조 설계)

  • Kang, Kook-Jin;Roh, Yong-Rae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.21 no.11
    • /
    • pp.987-994
    • /
    • 2008
  • The optimal structure of the Tonpilz transducer was designed. First, the FE model of the transducer was constructed, that included all the details of the transducer which used practical environment. The validity of the FE model was verified through the impedance analysis of the transducer. Second, the resonance frequency, the sound pressure, the bandwidth, and the impulsive shock pressure of the transducer in relation to its structural variables were analyzed. Third, the design method of $2^n$ experiments was employed to reduce the number of analysis cases, and through statistical multiple regression analysis of the results, the functional forms of the transducer performances that could consider the cross-coupled effects of the structural variables were derived. Based on the all results, the optimal geometry of the Tonpilz transducer that had the highest sound pressure level at the desired working environment was determined through the optimization with the SQP-PD method of a target function composed of the transducer performance. Furthermore, for the convenience of a user, the automatic process program making the optimal structure of the acoustic transducer automatically at a given target and a desired working environment was made. The developed method can reflect all the cross-coupled effects of multiple structural variables, and can be extended to the design of general acoustic transducers.

Development of the Hydraulic Pressure Transducer System for Testing the Impact Energy of Hydraulic Breaker (유압 브레이커의 타격 에너지 측정을 위한 유압 변환장치 개발)

  • 이근호;이용범;정동수
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.21 no.4
    • /
    • pp.154-160
    • /
    • 2004
  • Hydraulic breaker of excavator has been used for the destruction and disassembling of buildings, crashing road pavement, breaking rocks at quaky and etc. The performance of breakers is evaluated their own destructive force and the number of impact by input hydraulic flow rate and pressure on the operating conditions. Because hydraulic breakers generate high impact energy, the accurate measurement of the impact force has been facing a technical challenge. In this study, the hydraulic pressure transducer system was developed based on the characteristics of pressure variation in closed vessel fur testing the impact energy. The hydraulic pressure transducer system is consisted with a hydraulic cylinder, main base, pressure & temperature sensors, LVDT, data acquisition system and etc. The developed hydraulic pressure transducer system was applied to measure the impact energy for hydraulic breaker. The measured impact force was 438.8 kgf.m within the designed impact force bounds. The developed hydraulic pressure transducer system as a simple tester could be applied to measure the impact force and the number of impact.

Development of Pressure Control System of Contact Transducer for Measurement of Ultrasonic Nonlinear Parameter

  • Lee, In-Ho;Son, Dae-Soo;Choi, Ik-Hwang;Lee, Tae-Hun;Jhang, Kyung-Young
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.27 no.6
    • /
    • pp.576-581
    • /
    • 2007
  • Ultrasonic nonlinearity has been considered as a promising method to evaluate the micro damage of material; however, its magnitude is so small that its measurement is not easy. Especially, when we use contact PZT transducer, if the contacting pressure is not kept in constant during the measurement then there exists extraneous fluctuation in the measured nonlinearity caused by the unstable contact condition, In this paper, we developed a pneumatic control system to keep the contacting pressure of transducer in constant during the measurement and analyzed the effect of contacting pressure to the ultrasonic nonlinearity measurement As a result, we found that the pressure of transducer in our measurement system should be greater than 170 kPa to measure the ultrasonic nonlinear parameter in stable with no dependency on the contacting pressure.

Variation in the Vibration Characteristics of a Piezoelectric Transducer due to Pre-pressure (예압에 따른 압전 변환기의 공진특성 변화)

  • Kim, Dae-Seung;Kim, Jin-Oh
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.16 no.1 s.106
    • /
    • pp.89-100
    • /
    • 2006
  • This paper presents an analytical approach to describe the variation in the vibration characteristics such as the natural frequency of a piezoelectric transducer under static pre-pressure. The transducer considered in this paper is a bolt-clamped Langevin-type transducer, which consists of a couple of piezoelectric discs, a couple of metal blocks for added mass effect, and a bolt to tighten them. A new analysis model for the transducer has been developed by taking into account the contact area between the piezoelectric ceramic disc and the metal block. The variation of the resonance frequency due to the pre-pressure has been calculated and compared with measured results reported earlier.

Designing cyliner pressure transducer of 0-3.0MPA

  • Shangchun, Fan;Guangyu, Liu;Lee, Man-Hyung
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1996.10a
    • /
    • pp.422-425
    • /
    • 1996
  • The frequency-pressure relationship of the cylinder, within 0-3.0Mpa, is studied by making use of the finite element method (FEM). Based on numerical calculations of FEM and the actual working conditions of the cylinder pressure transducer, this paper presents the optimizing results of the length, the radius and the thickness of the cylinder. Moreover, this paper gives some more important points on designing the whole structure of the cylinder and on reality of the transducer system. The obtained results are of important theoretical bases for developing the cylinder pressure transducer of 0-3.0Mpa.

  • PDF

The Design using the reluctance of Reluctive Pressure Transducer (릴럭턴스를 이용한 Reluctive Pressure Transducer의 설계)

  • 조항신;박희성;주형준;성세진;이기홍
    • Proceedings of the KIPE Conference
    • /
    • 1998.07a
    • /
    • pp.328-331
    • /
    • 1998
  • Because of the powerful tolerance of overload, dynamic response and anti-erosion, Reluctive Pressure Transducer(RPT), as a measuring element of oil pressure equipment is applied to the measuring system of vessels, air craft. The Electrical reluctance appeared in the pressed diaphragm. To process the reluctance as a electric signal, bridge circuit is used. The design using the reluctance of pressure sensor is described in this paper. For the high efficiency of the sensitive RPT, pressure sensor structure is presented and electrical signal processing is simulated.

  • PDF

Variation In the Vibration Characteristics of Piezoelectric Transducers due to Pre-Pressure (예압에 따른 압전 변환기의 공진 특성)

  • Kim, Dae-Seung;Kim, Jin-Oh
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2005.05a
    • /
    • pp.484-487
    • /
    • 2005
  • This paper presents an analytical approach to describe the variation in the vibration characteristics such as the natural frequency of a piezoelectric transducer under static pre-pressure. The transducer considered in this paper is a bolt clamped Langevin type transducer, which consists of a couple of piezoelectric discs, a couple of metal blocks for added mass effect, and a bolt to tighten them. A new analysis model for the transducer has been developed by taking into account the contact area between the piezoelectric ceramic and the metal block. The variation of the resonance frequency due to the pre-pressure has been calculated compared with other results.

  • PDF

An Analysis of the Acoustic Radiation Characteristics from the Acoustic Transducer (압전세라믹스를 이용한 음향트랜스듀서의 음향방사특성 해석)

  • 노현택;고영준;박재성;남효덕;장호경
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2000.07a
    • /
    • pp.703-706
    • /
    • 2000
  • The acoustic characteristics radiated from the acoustic transducer with metal-piezoceramic laminated circular plate were simulated. The Vibrational modes of metal-piezoceramic laminated circular plates were calculated by using the finite element method. After meshing the inside closed boundary of the acoustic transducer, the pressure gradients and the isotaric lines were calculated for the various frequencies. It has been observed that the characteristics of the sound pressure calculated for the various frequencies. Also, the directivity patterns and the sound pressure radiated from the acoustic transducer were calculated by 2-dimensional analysis.

  • PDF

Optimal Structural Design of a Flextensional Transducer Considering the Working Environment (적용환경을 고려한 Flextensional 변환기의 최적구조 설계)

  • Kang, Kook-Jin;Roh, Yong-Rae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.21 no.12
    • /
    • pp.1063-1070
    • /
    • 2008
  • The performance of an acoustic transducer is determined by the effects of many design variables, and mostly the influences of these design variables are not linearly independent of each other. To achieve the optimal performance of an acoustic transducer, we must consider the cross-coupled effects of the design variables. In this study, the variation of the performances of underwater acoustic transducer in relation to its structural variables was analyzed. In addition, the new optimal design scheme of an acoustic transducer that could reflect not only individual but also all the cross-coupled effects of multiple structural variables, and could determine the detailed geometry of the transducer with great efficiency and rapidity was developed. The validation of the new optimal design scheme was verified by applying the optimal structure design of a flextensional transducer which are the most common use for high power underwater acoustic transducer. With the finite element analysis(FEA), we analyzed the variation of the resonance frequency, sound pressure, and working depth of a flextensional transducer in relation to its design variables. Through statistical multiple regression analysis of the results, we derived functional forms of the resonance frequency, sound pressure, and working depth in terms of the design variables. By applying the constrained optimization technique, Sequential Quadratic Programming Method of Phenichny and Danilin(SQP-PD), to the derived function, we designed and verified the optimal structure of the Class IV flextensional transducer that could provide the highest sound pressure level and highest working depth at a given operation frequency of 1 kHz.