Out-of-plane Motion in Externally Excited String with Second Mode

2020 ◽  
Vol 2020 (0) ◽  
pp. 17G18
Author(s):  
ZHAO WEIQI ◽  
Hiroshi Yabuno
Keyword(s):  
Plane Motion ◽  
Second Mode ◽  
Out Of Plane

Out-of-Plane Motion Effects in Microscopic Particle Image Velocimetry

2003 ◽  
Vol 125 (5) ◽  
pp. 895-901 ◽  
Author(s):  
Michael G. Olsen ◽  
Chris J. Bourdon
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Laser Sheet ◽  
Plane Motion ◽  
Entire Volume ◽  
Measurement Volume ◽  
Microscopic Particle ◽  
Image Velocimetry ◽  
Out Of Plane ◽  
Signal Peak

In microscopic particle image velocimetry (microPIV) experiments, the entire volume of a flowfield is illuminated, resulting in all of the particles in the field of view contributing to the image. Unlike in light-sheet PIV, where the depth of the measurement volume is simply the thickness of the laser sheet, in microPIV, the measurement volume depth is a function of the image forming optics of the microscope. In a flowfield with out-of-plane motion, the measurement volume (called the depth of correlation) is also a function of the magnitude of the out-of-plane motion within the measurement volume. Equations are presented describing the depth of correlation and its dependence on out-of-plane motion. The consequences of this dependence and suggestions for limiting its significance are also presented. Another result of the out-of-plane motion is that the height of the PIV signal peak in the correlation plane will decrease. Because the height of the noise peaks will not be affected by the out-of-plane motion, this could lead to erroneous velocity measurements. An equation is introduced that describes the effect of the out-of-plane motion on the signal peak height, and its implications are discussed. Finally, the derived analytical equations are compared to results calculated using synthetic PIV images, and the agreement between the two is seen to be excellent.

Vibrational potentials of the low frequency out‐of‐plane motion in the ground and excited singlet electronic states of 9,10‐dihydrophenanthrene

1992 ◽  
Vol 96 (10) ◽  
pp. 7229-7236 ◽  
Author(s):  
Marek Z. Zgierski ◽  
Francesco Zerbetto ◽  
Young‐Dong Shin ◽  
Edward C. Lim
Keyword(s):  
Low Frequency ◽  
Electronic States ◽  
Plane Motion ◽  
Excited Singlet ◽  
Out Of Plane

A pOH Jump Driven by N═N Out-of-Plane Motion in the Photoisomerization of Water-Solvated Triazabutadiene

2017 ◽  
Vol 121 (26) ◽  
pp. 4939-4947
Author(s):  
Hongmei Xiao ◽  
Lishuang Ma ◽  
Weihai Fang ◽  
Xuebo Chen
Keyword(s):  
Plane Motion ◽  
Out Of Plane

Electrostatically-Driven-Leverage Actuator as an Engine for Out-of-plane Motion

2001 ◽  
pp. 740-743 ◽  
Author(s):  
Hung-Yi Lin ◽  
Hsin-Hwa Hu ◽  
Weileun Fang ◽  
Ruey-Shing Huang
Keyword(s):  
Plane Motion ◽  
Out Of Plane

Out-of-Plane Comb-Drive Lever Actuator

2000 ◽  
Author(s):  
Hung-Yi Lin ◽  
Weileun Fang
Keyword(s):  
Electrostatic Force ◽  
Plane Motion ◽  
Comb Drive ◽  
Out Of Plane ◽  
Gap Closing

Abstract In the present study, an out-of-plane motion actuator driven by the electrostatic force is designed and fabricated. The electrostatic force generated by the gap closing electrodes and the comb electrodes will be studied. Moreover, a lever motion transmitting mechanism is proposed to modulate the motion of the actuators. Although the space between the driving electrodes is limited, the lever motion transmitting mechanism could enlarge the traveling distance. The applications of the out-of-plane motion actuator are remarkably increased due to the assistant of the transmitting mechanism.

Dynamic Interaction Between a Straight Tube and an Anti-Vibration Bar

2009 ◽  
Author(s):  
Isabelle Nowlan ◽  
Annie Ross ◽  
Michel J. Pettigrew
Keyword(s):  
Dynamic Behavior ◽  
Dynamic Interaction ◽  
Plane Motion ◽  
Work Rate ◽  
Fretting Wear ◽  
Straight Tube ◽  
Local Excitation ◽  
Out Of Plane ◽  
Simple Supports ◽  
Excitation Force

Fretting-wear is a known problem in steam generator U-tubes. These tubes are supported by flat bars called anti-vibration bars (AVB) in the plane of the U-bend. Clearances between the tubes and the bars are designed to be minimal, but cumulative tolerances and manufacturing variations may lead to clearances larger than expected. Large clearances may result in ineffective support leading to in-plane and out-of-plane motion causing fretting-wear and impact abrasion. In the present work, the problem is investigated with a single two span tube, an anti-vibration bar at mid-span and a local excitation force. The dynamic behavior of a tube with simple supports at both ends and an anti-vibration bar at mid-span is characterized. The influence of clearance, preload and tilt of the support on the dynamics of the tube are investigated experimentally. The results indicate that the fretting-wear work-rate is very low with preloads, reaches a maximum around a zero clearance and diminish again for larger clearances. The tilt of the anti-vibration bar in our experiments seems to change the dynamic behavior of the tube.

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