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非接触式光学应变测量技术研究进展 被引量:16
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作者 屈蓓 付小龙 +4 位作者 何俊武 蔚红建 李吉祯 张亚俊 张昊越 《计测技术》 2013年第5期10-15,共6页
随着光学应变测量技术的兴起,特别是非接触式的光学应变测量技术的发展,使得这一技术已成为应变测量的先进技术。本文在分析非接触式应变测量技术研究进展的基础上,介绍了几种较前沿的非接触式光学应变测量技术及其应用,同时对该技术的... 随着光学应变测量技术的兴起,特别是非接触式的光学应变测量技术的发展,使得这一技术已成为应变测量的先进技术。本文在分析非接触式应变测量技术研究进展的基础上,介绍了几种较前沿的非接触式光学应变测量技术及其应用,同时对该技术的优缺点进行了总结。 展开更多
关键词 力学测量技术 非接触式光学应变测量 数字图像相关技术 电子散斑图干涉技术 应变场
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Preliminary study on theory and experiment of photo-mechanics manufacturing and detecting technologies based on laser thermal stress
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作者 Kong Dejun Zhang Yongkang +3 位作者 Zhu Hailin Lu Jinzhong Feng Aixin Wang Wei 《Engineering Sciences》 EI 2008年第3期52-56,共5页
Mechanics effect of laser thermal stress is a new manufacturing technology, which uses thermal stress by high power laser acted on the surface of metal material to produce stress field. The technologies such as sheet ... Mechanics effect of laser thermal stress is a new manufacturing technology, which uses thermal stress by high power laser acted on the surface of metal material to produce stress field. The technologies such as sheet metal formation by laser thermal stress, measurement by laser scratching and measurement by XRD (X-ray diffraction) are formed based on mechanics effects of laser thermal stress. The mechanisms of sheet metal formation by laser thermal stress, measurement by laser scratching and measurement by XRD are analyzed, and the theory of photo-mechanics manufacturing and detecting technologies based on laser thermal stress is originally put forward, whose experiment is primitively researched, and the manufacturing theory by mechanics effects of laser thermal stress is established. 展开更多
关键词 photo-dynamics manufacturing sheet metal forming by laser thermal stress laser scratching X-ray diffraction (XRD)
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The Influence of Modulated Slotted Synthetic Jet on the Bypass of Hump
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作者 Petr Pick Miroslav Andrle Vladislav Saila Milan Matej ka 《Journal of Mechanics Engineering and Automation》 2014年第3期225-233,共9页
This paper deals with the influence of phase modulated synthetic jet on the aerodynamics of the hump in a closed test section Of the Eiffel-type wind tunnel. Three experimental methods of measurement techniques of thi... This paper deals with the influence of phase modulated synthetic jet on the aerodynamics of the hump in a closed test section Of the Eiffel-type wind tunnel. Three experimental methods of measurement techniques of this phenomenon were used: the pressure profile using the Kiel total pressure probe, the velocity profile using the CTA (constant temperature anemometry) probe and the visualization of the flow field using the hot film and the thermo camera, The experimental results with and without the influence of the synthetic jet were compared, as well the impact of the phase shift of the neighbouring synthetic jets. As a reference case, the flow around the hump without the influence of the synthetic jet was selected. The results of the measurement are presented in figures and compared. 展开更多
关键词 Synthetic jet Kiel probe CTA probe loss coefficient phase shift modulation.
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An Investigation of Innovative Experimental and Numerical Techniques to Detect Boundary Layer Transition
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作者 Alessandro Cinciripini Pascal Bader +1 位作者 Giacomo Persico Wolfgang Sanz 《Journal of Mechanics Engineering and Automation》 2017年第4期221-234,共14页
Different methods to detect boundary layer transition are investigated within the scope of this paper. Laminar and turbulent boundary layers exhibit a significantly different behavior, not only regarding skin friction... Different methods to detect boundary layer transition are investigated within the scope of this paper. Laminar and turbulent boundary layers exhibit a significantly different behavior, not only regarding skin friction but also for heat-transfer which affects the blade cooling design. The present work presents a novel and non-intrusive measurement technique to detect the transition, based on acoustic concepts. The reliability of the technique was investigated by means of boundary layer measurements over a fiat plate in subsonic flow conditions. After a preliminary assessment with a conventional Preston tube, a row of microphones were installed along the plate to correlate transition pressure fluctuations. To provide a comprehensive representation of the experiment, dedicated measurements with a fast response aerodynamic pressure probe were performed to determine the turbulence intensity and the dissipation rate upstream of the flat plate. The experimental results were systematically compared with calculations performed with three different computational fluid dynamics solvers (ANSYS-Fluent, ANSYS-CFX, OpenFOAM) and using both the k-k1-ω and the γ-Reθ transition models. Results show a fair agreement between CFD (computational fluid dynamics) predictions and the acoustic technique, suggesting that this latter might represent an interesting alternative option for transition measurements. 展开更多
关键词 Boundary layer transition acoustic measurements CFD Preston tube flat plate
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