scholarly journals Doppler telemetry system for the evaluation of low speed movements in the atmosphere

2004 ◽  
Vol 17 (3) ◽  
pp. 313-324 ◽  
Author(s):  
Mihail Tanase ◽  
Corneliu Toma ◽  
Dan Popa ◽  
Ioan Lie
Keyword(s):  
Radio Telemetry ◽  
Telemetry System ◽  
Movement Execution ◽  
Average Speed ◽  
Low Speed ◽  
Movement Sense ◽  
Low Costs ◽  
Work Done

This paper is a result of the work done by the authors in the field of movement evaluation at low speed in the atmosphere and low costs of the movement execution. Theoretical and constructive solutions are offered for telemetry of the following features of movement: instant and average speed movement sense and direction, instant position related to a fixed referential. The presented solution, the Doppler radio telemetry system with active fixed referential-described in the paper-was practically realized and experimentally its utility has been demonstrated.

An implantable radio-telemetry system for detecting multiple bio-parameters of a small animal based on wireless energy transmission

Mechatronics ◽  
2015 ◽  
Vol 28 ◽  
pp. 18-26 ◽  
Author(s):  
Hua Liu ◽  
Ziping Guo ◽  
Hengyang Zhao ◽  
Guozheng Yan ◽  
Zhiwu Wang ◽  
...  
Keyword(s):  
Radio Telemetry ◽  
Small Animal ◽  
Telemetry System ◽  
Energy Transmission

scholarly journals Research on Low-Speed Driving Model of Ultrasonic Motor Based on Beat Traveling Wave Theory

Actuators ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 304
Author(s):  
Weijun Zeng ◽  
Song Pan ◽  
Lei Chen ◽  
Weihao Ren ◽  
Xiaobin Hu
Keyword(s):  
Traveling Wave ◽  
Ultrasonic Motor ◽  
Transfer Model ◽  
Motor Speed ◽  
Average Speed ◽  
Periodic Fluctuation ◽  
Variation Trend ◽  
Low Speed ◽  
Driving Model ◽  
Measurement Experiment

This paper proposes a driving method, the superimposed pulse driving method, that can make an ultrasonic motor run at a low speed. Although this method solves the periodic oscillation of speed in a traditional low-speed driving motor, it still has a small periodic fluctuation, which affects the stability of the speed. To reduce the fluctuation rate of the motor speed, the structure model and driving model of the motor are established, based on the theory of a beat traveling wave, and the motion characteristics of the particle point are analyzed in this paper. The simulation curve of the motor speed is obtained according to the stator and rotor contact model and the transfer model. The research shows that the driving method introduced in this paper causes the stator surface to generate a traveling beat wave, and the driving end of the stator generates an intermittent reciprocating vibration and drives the rotor rotation, which is the mechanism of low-speed operation when the driving method is used to drive the motor, as well as the reason for the periodic fluctuation of the motor speed. To improve the speed stability, this paper controlled the output performance of the motor by changing the two control variables—prepressure and frequency difference—and concluded that the variation trend of the average speed and speed volatility were consistent with the variation trend of the motor’s average speed determinant and the speed volatility determinant, respectively, which is verified by the velocity measurement experiment and the vibration measurement experiment. These insights lay the theoretical foundation for the velocity adjustment and stability optimization and, finally, the application of the new driving method is prospected.

Coulomb Friction Crawling Model Yields Linear Force–Velocity Profile

2019 ◽  
Vol 86 (5) ◽  
Author(s):  
Ziyou Wu ◽  
Dan Zhao ◽  
Shai Revzen
Keyword(s):  
Kinetic Energy ◽  
Velocity Profile ◽  
Entire Range ◽  
Coulomb Friction ◽  
Viscous Friction ◽  
Governing Equations ◽  
Average Speed ◽  
Force Velocity ◽  
Linear Force ◽  
Work Done

Conventional wisdom would have it that moving mechanical systems that dissipate energy by Coulomb friction have no relationship between force and average speed. One could argue that the work done by friction is constant per unit of distance travelled, and if propulsion forces exceed friction, the net work is positive, and the system accumulates kinetic energy without bound. We present a minimalistic model for legged propulsion with slipping under Coulomb friction, scaled to parameters representative of single kilogram robots and animals. Our model, amenable to exact solutions, exhibits nearly linear (R2 > 0.96) relationships between actuator force and average speed over its entire range of parameters, and in both motion regimes, it supports. This suggests that the interactions inherent in multilegged locomotion may lead to governing equations more reminiscent of viscous friction than would be immediately obvious.

scholarly journals Exploring the influence of traffic enforcement on speeding behavior on low-speed limit roads

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989157
Author(s):  
Dan Zhao ◽  
Fengchun Han ◽  
Meng Meng ◽  
Jun Ma ◽  
Quantao Yang
Keyword(s):  
Traffic Safety ◽  
Stated Preference ◽  
Personal Characteristics ◽  
Speed Limit ◽  
Survey Analysis ◽  
Traffic Enforcement ◽  
Stated Preference Survey ◽  
Average Speed ◽  
Low Speed ◽  
The Impact

Speeding on low-speed limit roads is a common traffic offense in China, which could be due to the mild traffic safety enforcement. The article aims to explicit the impact of traffic enforcement measures on the speeding behavior on low-speed limit roads. First, field data were collected to demonstrate the severity of speeding by investigating speed distribution; second, a virtual traffic enforcement was designed by considering three factors related to traffic enforcement, and a stated preference survey questionnaire including six scenarios was designed and implemented; finally, a series of generalized regret random minimization models were established to study the relationship of speeding behavior and traffic enforcement as well as drivers’ personal characteristics. From the stated preference survey analysis, the research figures out that other vehicles’ average speed is the most important reference to choose speed rather than traffic penalties, and the model estimation results show that speeding violation grows severe if traffic enforcements are lenient. Therefore, increasing the violation costs is a powerful means of lowering the probability of speeding for individual, thus proceeding the drop of vehicles’ average speed, and the fall of average speed will contribute to decrease speeding subsequently.

Migrating Android Applications to the Cloud

2012 ◽  
pp. 993-1008
Author(s):  
Shih-Hao Hung ◽  
Jeng-Peng Shieh ◽  
Chen-Pang Lee
Keyword(s):  
Cloud Computing ◽  
Mobile Network ◽  
End Users ◽  
Current Generation ◽  
Computing Power ◽  
Virtual Storage ◽  
Low Speed ◽  
Migration Mechanism ◽  
Android Applications ◽  
Low Costs

Recently, smartphone technologies have evolved quickly and offered end users the computing power and networking capabilities required to perform useful network and multimedia applications. However, due to limited physical sizes and battery capacities, the current generation of smartphones cannot yet fulfill the requirements of sophisticated applications of which personal computers are capable. One way to solve this problem is to minimize the workload on a smartphone as much as possible by offloading portions of an application to a server. The solution is particularly attractive today as cloud computing provides the needed server resources at relatively low costs. This paper proposes a novel, lightweight application migration mechanism for the users of smartphones to suspend the execution of applications and offload them to the cloud. The authors also developed a framework to perform Android applications efficiently with virtual phones in the cloud with a virtual storage. This paper discusses the migration mechanism and evaluates its effectiveness on the Android smartphone. This approach may effectively offload workload for Android applications even with low-speed mobile network.

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