• Title/Summary/Keyword: Testing Machine

Search Result 1,632, Processing Time 0.026 seconds

Program Development for the Determination of Equivalent Load for Accelerated Fatigue Testing and the Estimation of Fatigue Life (가속 내구 시험을 위한 등가하중 설정과 피로수명 예측을 위한 프로그램 개발)

  • 이강용;박병화;이득용
    • Journal of the Korean Society for Railway
    • /
    • v.6 no.4
    • /
    • pp.265-272
    • /
    • 2003
  • The computer program for the accelerated life testing technique of a machine part under the service conditions is developed under the GUI environment so that the user can easily obtain the results by selecting the program module. Also, the theoretical backgrounds for the computer program and the procedures of the accelerated testing method are introduced by testing the specimens made of the stainless steel 316L under the high temperature and random loading. The reliability of the program is discussed by the experimental results of the fatigue life, age degradation and accelerated testing conditions.

Development of a Fatigue Testing System for Micro-Specimens (마이크로시험편용 피로시험기 개발)

  • Kim, Chung-Youb;Sharpe, W.N.
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.34 no.9
    • /
    • pp.1201-1207
    • /
    • 2010
  • In this study, a fatigue testing system capable of performing load-controlled tension-tension tests for micro-specimens was developed by using an electro-magnetic actuator. Using this system, fatigue testing as well as tensile testing can be performed over a wide range of loading frequencies. Further, a new laser interferometric strain/displacement gage was used during fatigue testing to obtain high-resolution measurements of the cyclic deformation of thin films. Since the testing machine and the displacement gage are stable and show quick responses, the displacement can be measured instantaneously and continuously during fatigue testing, and high-resolution results can be obtained.

A Study on the Sliding Ball Joint of Parallel Kinematic Mechanism (병렬 운동 기구의 미끄럼 볼 조인트 개발에 관한 연구)

  • Yoo, Dae-Won;Lee, Jai-Hak
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.33 no.9
    • /
    • pp.982-989
    • /
    • 2009
  • Parallel Kinematic Mechanism (PKM) is a device to perform the various motion in three-dimensional space and it calls for six degree of freedom. For example, Parallel Kinematic Mechanism is applied to machine tools, medical equipments, MEMS, virtual reality devices and flight motion simulators. Recently, many companies have tried to develop new Parallel Kinematic Mechanism in order to improve the cycle time and the precisional tolerance. Parallel Kinematic Mechanism uses general universal joint and spherical joint, but such joints have accumulated tolerance problems. Therefore, it causes position control problem and dramatically life time reduction. This paper focused on the rolling element to improve sliding precision in new sliding ball joint development. Before the final design and production, it was confirmed that new sliding ball joint held a higher load and a good geometrical structure. FEM analysis showed a favorable agreement with tensile and compressive testing results by universal testing machine. In conclusions, a new sliding ball joint has been developed to solve a problem of accumulated tolerance and verified using tensile and compressive testing as well as FEM analysis.

Investigation of receiving position in the measurement method for floor impact sound in a testing building (표준시험동 바닥충격음 측정위치에 대한 고찰)

  • Lee, Sin-Young;Yoo, Seung-Yup;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.05a
    • /
    • pp.964-968
    • /
    • 2007
  • The measurement of floor impact sound have been standardized in KS 2810-1 and 2. The height of receiving microphones position is specified in the standard as 1.2m which is almost half height of apartment rooms as a listening position. In this study, receiving positions are investigated by measuring the distribution of sound pressure levels at 792 receiving microphone positions in the standard testing building. Standard impact sources, tapping machine and impact ball, are driven on the center position in the source room where is located at the above floor. It was found that the distribution of sound pressure levels in the receiving room indicates significant deviation at different frequencies there is more than 5dB drop at 63Hz but 2dB rise at 125Hz at a height of 1.2m when the impact ball is driven, in the other case of a generating tapping machine there is more than 2dB rise at 125Hz at a height of 1.2m due to room modes.

  • PDF

Modeling and Vibration Control of the Miniature Universal Testing Machine (소형 재료시험기의 모델링 및 진동 제어)

  • Bok, Jin;Kim, Yeung-Shik;Kweon, Hyeon-kyu;Kim, In-Soo;Choi, Seong-Dae
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.15 no.3 s.96
    • /
    • pp.290-296
    • /
    • 2005
  • This paper proposes the modeling scheme of the Miniature Universal Testing Machine (MUTM) composed of 36 thin-beam-type bimorph PZTs and the control algorithm to minimize the residual vibration of the MUTM in the dynamic testing of specimens. In the operation of the MUTM, hysteresis, residual displacement and vibration of it are major issues. From the analysis of the MUTM behaviors, the hysteresis is described by the curving fitting scheme with the function of an input voltage. The dynamic characteristics of the MUTM are identified by the frequency domain modeling technique based on the experimental data. The interested bandwidth is focused on 125-315HZ for effective modeling and control. For the robust vibration control of the MUTM, the sliding mode control and the Kalman filter as observer are proposed. The paper also proposes the best input signal type to operate the MUTM effectively. The feasibility of the proposed modeling scheme and control algorithm are tested and verified experimentally.

Modeling and Vibration Control of the Miniature Universal Testing Machine (소형 재료시험기의 모델링 및 진동 제어)

  • Bok, Jin;Kim, Young-Shik;Kweon, Hyeon-Kyu;Kim, In-Soo;Choi, Seong-Dae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2004.11a
    • /
    • pp.476-481
    • /
    • 2004
  • This paper proposes the modeling scheme of the Miniature Universal Testing Machine (MUTM) composed of 36 thin-beam-type bimorph PZTs and the control algorithm to minimize the residual vibration of the MUTM in the dynamic testing of specimens. In the operation of the MUTM, hysteresis, residual displacement and vibration of it are major issues. From the analysis of the MUTM behaviors, the hysteresis is described by the curving fitting scheme with the function of an input voltage. The dynamic characteristics of the MUTM are identified by the frequency domain modeling technique base on the experimental data. The interest bandwidth is focused on 125-315HZ for effective modeling and control. For the robust vibration control of the MUTM, the sliding mode control and the Kalman filter as observer are proposed. The paper also proposes the best input signal type to operate the MUTM effectively. The feasibility of the proposed modeling scheme and control algorithm are tested and verified experimentally.

  • PDF

Effect of Fat on the Structural and Textural Properties of Soybeam Curd (두부의 주조 및 질감 특성에 미치는 지방의 영향)

  • 윤영미;손경희
    • Korean journal of food and cookery science
    • /
    • v.1 no.1
    • /
    • pp.57-64
    • /
    • 1985
  • This study was conducted to investigate the effect of fat on structure and texture of soybean curds by partial or whole replacement of soybean with defatted soy flour, The textural properties of soybean curd were examined by Instron universal testing machine, and the microscopic structure of soybean curds was examined by Scanning electron microscope(SEM). The results obtained were as follows ; 1. Textural parameters determined by Instron universal testing machine showed that hardness and gumminess of soybean curs were significantly increased as the fat contents of the samples decreased. On the while, springiness of the samples were significantly lowered as the fat content decreased. 2. Microscopic structure of soybean curds examined by SME demonstrated that samples with high fat had more fat globules and thinner network layer which were assumed to surround moisture with.

  • PDF

A Study on the Light Cylinder Using Chemical Milling (케미컬 밀링을 이용한 실린더 경량화 연구)

  • Yoo Joon-Tae;Yoon Jong-Hoon;Jang Young-Soon;Yi Yeong-Moo;Kang Suk-Bong;Lee Jong-Woong
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.30 no.4 s.247
    • /
    • pp.451-456
    • /
    • 2006
  • The process for reducing the weight of the structure is chiefly performed by the machine processing. But, increasing the weight for strength of welding zone and geometrical defect are occurred in machine processing. In this study, chemical milling is applied to reduce the weight of the cylinder. Before chemical milling is applied to the cylinder, specimen testing is performed. After the specimen testing, NaOH 15% is selected to perform the chemical milling. After the chemical milling, the velocity of reagent is 0.0016 mm/min and the thickness of cylinder is about 2.4 mm after chemical milling.

Incremental Model-based Test Suite Reduction with Formal Concept Analysis

  • Ng, Pin;Fung, Richard Y.K.;Kong, Ray W.M.
    • Journal of Information Processing Systems
    • /
    • v.6 no.2
    • /
    • pp.197-208
    • /
    • 2010
  • Test scenarios can be derived based on some system models for requirements validation purposes. Model-based test suite reduction aims to provide a smaller set of test scenarios which can preserve the original test coverage with respect to some testing criteria. We are proposing to apply Formal Concept Analysis (FCA) in analyzing the association between a set of test scenarios and a set of transitions specified in a state machine model. By utilizing the properties of concept lattice, we are able to determine incrementally a minimal set of test scenarios with adequate test coverage.

ESTIMATION OF RIDE QUALITY OF A PASSENGER CAR WITH NONLINEAR SUSPENSION

  • Cho, S.J.;Choi, Y.S.
    • International Journal of Automotive Technology
    • /
    • v.8 no.1
    • /
    • pp.103-109
    • /
    • 2007
  • The nonlinear characteristics of a suspension is directly related to the ride quality of a passenger car. In this study, the nonlinear characteristics of a spring and a damper of a passenger car is analyzed by dynamic experiments using the MTS single-axial testing machine. Also, a mathematical nonlinear dynamic model for the suspension is devised to estimate the ride quality using the K factor. And the effect on the variation of the parameters of the suspension is examined. The results showed that the dynamic viscosity of the oil in a damper was the parameter that most influeced the ride quality of a passenger car for the ride quality of a passenger car.