Nanogenerator as an active sensor for vortex capture and ambient wind-velocity detection

2012 ◽  
Vol 5 (9) ◽  
pp. 8528 ◽  
Author(s):  
Rui Zhang ◽  
Long Lin ◽  
Qingshen Jing ◽  
Wenzhuo Wu ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Ambient Wind ◽  
Active Sensor ◽  
Vortex Capture

scholarly journals Effect of ambient wind velocity on Planetary Nebula morphology

1997 ◽  
Vol 180 ◽  
pp. 224-224
Author(s):  
Vikram V. Dwarkadas ◽  
Roger A. Chevalier ◽  
John M. Blondin
Keyword(s):  
Wind Velocity ◽  
Ambient Medium ◽  
Asymptotic Giant Branch ◽  
Density Contrast ◽  
Expansion Velocity ◽  
Ambient Wind ◽  
Pn Velocity ◽  
Fast Wind ◽  
Self Similar ◽  
Slow Wind

Planetary Nebulae (PNe) are formed by the interaction of the fast wind from a post-Asymptotic Giant Branch Star with the slow ambient wind from a previous epoch. If the two interacting winds have constant properties, the velocity of the PN shell tends towards a constant with time and the shape becomes self-similar. Additionally, if the velocity of the fast wind is much higher than the expansion velocity of the shell, the interior of the hot shocked bubble becomes isobaric. Using semi-analytical methods, complemented by hydrodynamic simulations, we have calculated the shapes of PNe in the self-similar stage (Dwarkadas et al. 1996). We have investigated the contribution of the ambient wind velocity to PN morphology, which has hitherto not received much attention since the work of Kahn & West (1985). We find that the nebular morphology is a consequence of the density contrast between pole and equator in the ambient medium, the steepness of the density profile and the velocity of the ambient wind; classification of PNe purely on the basis of the first two factors may be misleading. In particular, the ratio of ambient wind velocity to PN velocity is important in determining whether the nebula shows a bulge or a cusp at the equator. A high density contrast coupled with a low velocity for the external medium gives rise to extremely bipolar nebulae. For large density contrasts and a significant value of the slow wind velocity, the surface density maximum of the shell shifts away from the equator, giving rise to peanut-shaped structures with pronounced equatorial bulges. As long as the external wind velocity is small compared to the expansion velocity of the nebula, the PNe tend to be more bipolar, even with a moderate density contrast. If the PN velocity is close to that of the external wind, the shape is relatively spherical. However, inclusion of an asymmetric velocity profile in the slow wind, with the velocity increasing towards the pole, can lead to a bipolar nebula if the equatorial velocity is sufficiently low. Preliminary results with a slow wind velocity increasing towards the equator (as is found in calculations of common envelope evolution) show that the nebulae tend to be more oblate, which is not often observed in nature. Representative results for shapes of PNe using various values of the relevant parameters are presented.

Effect of Ambient Wind Velocity on Planetary Nebula Morphology

1997 ◽  
pp. 224-224
Author(s):  
Vikram V. Dwarkadas ◽  
Roger A. Chevalier ◽  
John M. Blondin
Keyword(s):  
Wind Velocity ◽  
Planetary Nebula ◽  
Ambient Wind

Flow distortion investigation of wind velocity perturbations for two ocean meteorological platforms

2012 ◽  
Author(s):  
Marc Emond ◽  
Doug Vandemark ◽  
James Forsythe ◽  
Albert J. Plueddemann ◽  
J. Thomas Farrar
Keyword(s):  
Wind Velocity ◽  
Flow Distortion

Characteristics of Wind Velocity and Turbulence Intensity at Horizontal Axis Wind Turbines Array

2020 ◽  
Vol 8 (1) ◽  
pp. 22
Author(s):  
Ismail Ismail ◽  
Azhim Asyaratul Azmi ◽  
Erlanda Augupta Pane ◽  
Samsul Kamal
Keyword(s):  
Wind Velocity ◽  
Wind Turbines ◽  
Turbulence Intensity ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbines

Prediction for Soybean Grain Yield Using Active Sensor GreenSeeker

2014 ◽  
Vol 40 (4) ◽  
pp. 657 ◽  
Author(s):  
Ning ZHANG ◽  
Bo QI ◽  
Jin-Ming ZHAO ◽  
Xiao-Yan ZHANG ◽  
Su-Ge WANG ◽  
...  
Keyword(s):  
Grain Yield ◽  
Active Sensor

Remote wind velocity measurement using cloud motion detected by an RM-CW lidar and a CCD camera.

1990 ◽  
Vol 18 (5) ◽  
pp. 341-347
Author(s):  
Makoto ABO ◽  
Chikao NAGASAWA ◽  
Osamu UCHINO
Keyword(s):  
Wind Velocity ◽  
Velocity Measurement ◽  
Ccd Camera ◽  
Cloud Motion

scholarly journals A Sensaptic ADAS Device Using Shape Memory Alloy Wires: Design and Control

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3494
Author(s):  
Deivamoney Josephine Selvarani Ruth ◽  
Kaliaperumal Dhanalakshmi ◽  
Seung-Bok Choi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Haptic Feedback ◽  
Reaction Force ◽  
Vehicle Speed ◽  
Accelerator Pedal ◽  
Integrated Sensor ◽  
Electronic Throttle ◽  
Position Sensing ◽  
Active Sensor

This paper presents an active accelerator pedal system based on an integrated sensor and actuator using shape memory alloy (SMA) for speed control and to create haptics in the accelerator pedal. A device named sensaptics is developed with a pair of bi-functional SMA wires instrumented in a synergistic configuration function as an active sensor for positioning the accelerator pedal (pedal position sensing) to control the vehicle speed through electronic throttle and as a variable impedance actuator to generate active force (haptic) feedback to the driver. The reaction force emanated from the pedal alerts the driver and takes appropriate control action by slowing down the vehicle, in harmony with the road’s condition. The design is developed as a proof-of-concept device and is tested and evaluated in a real-time common rail diesel system for rail pressure regulation and over speeding tests, and the responses and performances are found to be promising.

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