Mobile Robot Coordinated Platooning: A Small-Scale Experimental Evaluation to Emulate Connected Vehicles

2015 ◽  
Author(s):  
Mohammad Goli ◽  
Azim Eskandarian
Keyword(s):  
Mobile Robots ◽  
Real Life ◽  
Point Of View ◽  
Small Scale ◽  
Experimental Point ◽  
Connected Vehicles ◽  
Multiple Robots ◽  
Experimental Platform ◽  
Vehicle Platooning ◽  
Set Up

This paper presents the problem of mobile robots specialized coordinated motion, namely platooning from an experimental point of view. An experimental set-up consisting of multiple mobile robots is developed to emulate a scaled version of real life connected vehicles which will move in a platoon formation for enhanced efficiency, safety, and energy conservations. The autonomous motion of multiple robots could be coordinated through wireless communications between them and a lead robot. Different aspects and requirements of an experimental platform to accomplish this mission are discussed. A platooning scenario using our connected mobile robots is demonstrated in this paper. The efficiency of the described platform in implementing vehicle platooning strategies and the behavior of propagation error when there is no communication between robots is observed from this experiment.

scholarly journals An Induction Motor Based Wind Turbine Emulator

2014 ◽  
Vol 51 (2) ◽  
pp. 11-21 ◽  
Author(s):  
A. Sokolovs ◽  
L. Grigans ◽  
E. Kamolins ◽  
J. Voitkans
Keyword(s):  
Wind Turbine ◽  
Induction Motor ◽  
Frequency Converter ◽  
Real Life ◽  
Power Coefficient ◽  
Small Scale ◽  
Ac Drive ◽  
Set Up ◽  
Ac Induction Motor ◽  
Good Agreement

Abstract The authors present a small-scale wind turbine emulator based on the AC drive system and discuss the methods for power coefficient calculation. In the work, the experimental set-up consisting of an AC induction motor, a frequency converter, a synchronous permanent magnet generator, a DC-DC boost converter and DC load was simulated and tested using real-life equipment. The experimentally obtained wind turbine power and torque diagrams using the emulator are in a good agreement with the theoretical ones.

Experimental Studies of Hydrodynamic Properties and Screening of Riser Fairing Concepts for Deep Water Applications

2015 ◽  
Author(s):  
Rolf Baarholm ◽  
Kjetil Skaugset ◽  
Halvor Lie ◽  
Henning Braaten
Keyword(s):  
Experimental Studies ◽  
Real Life ◽  
Cross Flow ◽  
Free Vibrations ◽  
The Body ◽  
Scale Model ◽  
Small Scale ◽  
Structural Fatigue ◽  
And Performance ◽  
Set Up

The VIV oscillations of marine risers are known to increase drag, and lead to structural fatigue. One proven method of suppressing this vibration is the use of fairings and strakes. These coverings essentially modify the flow along the cylinder, tripping the production of Karman vortices so that they act less coherently or far enough downstream so they interact less with the body. The Norwegian Deepwater Programme (NDP) has conducted a project with the objective to develop and qualify effective low drag fairing concepts with respect to VIV mitigation and galloping. Furthermore, emphasis is put on easy handling and installation. This paper describes the work and findings in an early phase of the development. This includes small scale model test campaigns. In addition to the bare riser for reference, the behaviour and performance of a total of 10 different fairing concepts are evaluated. Free oscillation tests are performed in a towing tank, where 2D fairings were tested in a pendulum set-up. The set-up enables free vibrations in up to 3 DOF (in-line and cross-flow vibrations and yaw). Fix tests with the purpose of establishing hydrodynamic coefficients for the various fairings have been performed in a large cavitation tunnel. Clear differences in performance have been noticed; particular for drag and galloping responses. Based on the results from the 2D tests, a screening of the fairing designs has been performed and the findings have set the course for further development of the most promising candidates for real life applications.

scholarly journals An FFT-solver used for virtual Dynamic Mechanical Analysis experiments: Application on a glassy/amorphous system and on a particulate composite

2021 ◽  
Author(s):  
Stéphane André ◽  
Julien Boisse ◽  
Camille Noûs
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Composite Structures ◽  
Viscoelastic Behavior ◽  
Particulate Composite ◽  
Mechanical Analysis ◽  
Point Of View ◽  
Small Scale ◽  
Experimental Point ◽  
Dynamic Mechanical ◽  
Voxel Grid

International audience FFT-based solvers are increasingly used by many researcher groups interested in modelling the mechanical behavior associated to a heterogeneous microstructure. A development is reported here that concerns the viscoelastic behavior of composite structures generally studied experimentally through Dynamic Mechanical Analysis (DMA). A parallelized computation code developed under complex-valued quantities provides virtual DMA experiments directly in the frequency domain on a heterogenous system described by a voxel grid of mechanical properties. The achieved precision and computation times are very good. An effort has been made to show the application of such virtual DMA tool starting from two examples found in the literature: the modelling of glassy/amorphous systems at a small scale and the modelling of experimental data obtained in temperature sweeping mode by DMA on a particulate composite made of glass beads and a polystyrene matrix, at a larger scale. Both examples show how virtual DMA can contribute to question, analyze, understand relaxation phenomena either on the theoretical or experimental point of view.

scholarly journals On broadband jet–ring interaction noise and aerofoil turbulence-interaction noise predictions

2010 ◽  
Vol 653 ◽  
pp. 337-364 ◽  
Author(s):  
MICHEL ROGER
Keyword(s):  
Transfer Function ◽  
Mixing Layer ◽  
Point Of View ◽  
Turbulent Velocity ◽  
Aerodynamic Noise ◽  
Experimental Point ◽  
Far Field ◽  
Theoretical Point ◽  
Parallel Side ◽  
Set Up

The aerodynamic noise of a thin rigid annulus (referred to as the ring here) placed in the mixing layer of a subsonic circular jet is investigated in the paper, both theoretically and experimentally. From the experimental point of view, the jet–ring configuration is understood as an axisymmetric alternative to more usual ones involving a rectangular aerofoil held between parallel side plates, dedicated to the study of the noise due to the impingement of upstream turbulence. The main advantages of the circular geometry are a minimum background noise, the absence of tip effects and more specifically the account for all radiation angles from the surface in the far-field acoustic signature. The circular set-up is well suited for the study of pure broadband interaction noise only if the flow remains free of self-sustained oscillations. This is ensured by keeping a sufficient interaction distance between the nozzle and the ring, and by shaping serrations on the nozzle lip. From the theoretical point of view, an analytical model is derived as a straightforward extension of existing formulations. The induced unsteady lift forces on the ring are first inferred from a linearized unsteady aerodynamic theory and the far field is calculated in a second step by a radiation integral. This relates the far-field acoustic pressure power spectral density (PSD) to the two-wavenumber spectrum of the radial turbulent velocity at the ring location, by means of an aeroacoustic transfer function. The latter is shown asymptotically identical to the one detailed in the Appendix for a rectangular aerofoil, in the limit of relatively high frequencies. The analytical acoustic predictions are found to agree well with the measurements over an extended frequency range, provided that the model is fed with turbulent velocity input data measured by a hot-wire probe. Indirectly, this agreement validates the transfer function for a rectangular aerofoil at oblique radiation angles, which is not achievable in a set-up involving side plates and a rectangular nozzle.

Odor Source Localization Using Multiple Robots in Complicated City-Like Environments

2011 ◽  
Vol 291-294 ◽  
pp. 3337-3344 ◽  
Author(s):  
Zhen Zhang Liu ◽  
Yi Jun Wang ◽  
Tien Fu Lu
Keyword(s):  
Mobile Robots ◽  
Source Localization ◽  
Human Life ◽  
Real Life ◽  
Source Location ◽  
Emission Source ◽  
Odor Source ◽  
Multiple Robots ◽  
Plume Tracing

The detection of a dangerous emission source location has the potential to be enhanced by using plume-tracing mobile robots, without endangering human life during the detection and source localization process. So far, many researchers focus on odor source localization in simple & laboratory based environments. The present study focuses on more real life odor source localization scenarios. In this study, multiple robots were used and coordinated by a supervisory program to locate an odor source in complicated city-like environments. A series of simulations has been conducted and the results demonstrated the potential of the supervisory program to effectively control a number of robots to locate a dangerous odor source in real life scenarios.

scholarly journals A Review; Application of Mechanical Monster in Era of Agricultural Industry

2020 ◽  
pp. 86-93
Author(s):  
Akshay Anjikar ◽  
Dr. Vinay Chandra Jha
Keyword(s):  
Real Life ◽  
Vital Role ◽  
Point Of View ◽  
Small Scale ◽  
Good Growth ◽  
Economic Point ◽  
Agricultural Industry ◽  
Indian Agriculture ◽  
New Ideas ◽  
Small Scale Farmers

In the Indian economy, agriculture plays a vital role. Over the last few decades, Indian agriculture has recorded good growth. Implementing new ideas in this field is very important, although a lot of work has been done in this area. The multipurpose farming robot is a fundamental and major agricultural machine for full yield. The traditional method of weeding, sowing seeds and spraying pesticides is a laborious procedure. In India, many farmers still use bullocks, horses, and buffalo for agricultural operations. In contrast to other countries around the world, this will not fulfil the need for agricultural energy requirements. We assume that human and animal efforts can be replaced from an economic point of view by some advanced mechanism that will be ideal for small-scale farmers. We are therefore designing this prototype and assume that it will fulfil all requirements and problems in real life. India is a country focused on agriculture in which 70% of individuals rely on the results of farming. But if we observe that with population growth the farm is spread among the family and because of this, farmers in India kept only two acres of farm on average. Economically, farmers are still very poor because they are unable to afford tractors and other expensive machinery, so they use conventional farming methods. So, we are designing this machinery that will fulfil all this need and solve the problem of labor.

High-Tc superconductors from the experimental point of view

1988 ◽  
Vol 156 (9) ◽  
pp. 117-135 ◽  
Author(s):  
L.P. Gor'kov ◽  
N.B. Kopnin
Keyword(s):  
Point Of View ◽  
Experimental Point

The Revolutionizing of the Revolution

2017 ◽  
Author(s):  
R. R. Palmer
Keyword(s):  
French Revolution ◽  
Point Of View ◽  
Strict Sense ◽  
French Government ◽  
Thing In Itself ◽  
Set Up ◽  
The Moment ◽  
The French Revolution ◽  
The Revolution

In 1792, the French Revolution became a thing in itself, an uncontrollable force that might eventually spend itself but which no one could direct or guide. The governments set up in Paris in the following years all faced the problem of holding together against forces more revolutionary than themselves. This chapter distinguishes two such forces for analytical purposes. There was a popular upheaval, an upsurge from below, sans-culottisme, which occurred only in France. Second, there was the “international” revolutionary agitation, which was not international in any strict sense, but only concurrent within the boundaries of various states as then organized. From the French point of view these were the “foreign” revolutionaries or sympathizers. The most radical of the “foreign” revolutionaries were seldom more than advanced political democrats. Repeatedly, however, from 1792 to 1799, these two forces tended to converge into one force in opposition to the French government of the moment.

Bleak Weather for Sun-Shine AG: A Case Study of Impairment of Assets

2014 ◽  
Vol 30 (2) ◽  
pp. 113-126 ◽  
Author(s):  
Dominic Detzen ◽  
Tobias Stork genannt Wersborg ◽  
Henning Zülch
Keyword(s):  
Real Life ◽  
Accounting Standards ◽  
Point Of View ◽  
Professional Judgment ◽  
Economic Point ◽  
Instructional Resource

ABSTRACT This case originates from a real-life business situation and illustrates the application of impairment tests in accordance with IFRS and U.S. GAAP. In the first part of the case study, students examine conceptual questions of impairment tests under IFRS and U.S. GAAP with respect to applicable accounting standards, definitions, value concepts, and frequency of application. In addition, the case encourages students to discuss the impairment regime from an economic point of view. The second part of the instructional resource continues to provide instructors with the flexibility of applying U.S. GAAP and/or IFRS when students are asked to test a long-lived asset for impairment and, if necessary, allocate any potential impairment. This latter part demonstrates that impairment tests require professional judgment that students are to exercise in the case.

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