scholarly journals Mechanical Decoupling Algorithm Applied to Electric Drive Test Bed

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Song Qiang ◽  
Luo Lin
Keyword(s):  
Electric Drive ◽  
Response Speed ◽  
Test Bed ◽  
New Approach ◽  
Decoupling Method ◽  
Mechanical Coupling ◽  
Simulation And Experiment ◽  
Motor Dynamometer ◽  
Decoupling Algorithm ◽  
Mechanical Decoupling

New approach and analysis are proposed in this paper to enhance the steady and rapidity of the electric drive test bed. Based on a basic drive motor dynamometer system (DMDS) test bed, detailed mathematical model and process control are established and analyzed. Relative gain array (RGA) method and diagonal matrix method are used to analyze the mechanical coupling caused by mechanical connection on the DMDS test bed, and the structure and algorithm of dynamic decoupling are proposed. Simulation and experiment all indicate that the designed decoupling method can efficiently improve the control accuracy and response speed.

The Aerosol Modeling Testbed: A Community Tool to Objectively Evaluate Aerosol Process Modules

2011 ◽  
Vol 92 (3) ◽  
pp. 343-360 ◽  
Author(s):  
Jerome D. Fast ◽  
William I. Gustafson ◽  
Elaine G. Chapman ◽  
Richard C. Easter ◽  
Jeremy P. Rishel ◽  
...  
Keyword(s):  
Model Performance ◽  
Field Measurements ◽  
Weather Research And Forecasting ◽  
Limited Data ◽  
Test Bed ◽  
New Approach ◽  
Aerosol Process ◽  
Wide Range ◽  
Aerosol Modeling ◽  
Current Paradigm

Abstract The current paradigm of developing and testing new aerosol process modules is haphazard and slow. Aerosol modules are often tested for short simulation periods using limited data so that their overall performance over a wide range of meteorological conditions is not thoroughly evaluated. Although several model intercomparison studies quantify the differences among aerosol modules, the range of answers provides little insight on how to best improve aerosol predictions. Understanding the true impact of an aerosol process module is also complicated by the fact that other processes—such as emissions, meteorology, and chemistry—are often treated differently. To address this issue, the authors have developed an Aerosol Modeling Testbed (AMT) with the objective of providing a new approach to test and evaluate new aerosol process modules. The AMT consists of a more modular version of the Weather Research and Forecasting model (WRF) and a suite of tools to evaluate the performance of aerosol process modules via comparison with a wide range of field measurements. Their approach systematically targets specific aerosol process modules, whereas all the other processes are treated the same. The suite of evaluation tools will streamline the process of quantifying model performance and eliminate redundant work performed among various scientists working on the same problem. Both the performance and computational expense will be quantified over time. The use of a test bed to foster collaborations among the aerosol scientific community is an important aspect of the AMT; consequently, the longterm development and use of the AMT needs to be guided by users.

scholarly journals Decoupling from yolk sac is required for extraembryonic tissue spreading in the scuttle fly Megaselia abdita

2017 ◽  
Author(s):  
Francesca Caroti ◽  
Everardo González Avalos ◽  
Viola Noeske ◽  
Paula González Avalos ◽  
Dimitri Kromm ◽  
...  
Keyword(s):  
Tissue Expansion ◽  
Time Lapse ◽  
Yolk Sac ◽  
Extraembryonic Tissue ◽  
Mechanical Coupling ◽  
Animal Development ◽  
Tissue Interactions ◽  
Megaselia Abdita ◽  
Mechanical Decoupling

ABSTRACTExtraembryonic tissues contribute to animal development, which often entails spreading over embryo or yolk. Apart from changes in cell shape, the requirements for this tissue spreading are not well understood. Here we analyze spreading of the extraembryonic serosa in the scuttle fly Megaselia abdita. The serosa forms from a columnar blastoderm anlage, becomes a squamous epithelium, and eventually spreads over the embryo proper. We describe the dynamics of this process in long-term, whole-embryo time-lapse recordings, demonstrating that free serosa spreading is preceded by a prolonged pause in tissue expansion. Closer examination of this pause reveals mechanical coupling to the underlying yolk sac, which is later released. We find mechanical coupling prolonged and serosa spreading impaired after knockdown of M. abdita Matrix metalloprotease 1. We conclude that tissue-tissue interactions provide a critical functional element to constrain spreading epithelia.Impact StatementExtraembryonic tissue spreading in the scuttle fly Megaselia abdita requires mechanical decoupling from the underlying yolk sac.

scholarly journals New Approach for an Easily Detachable Electric Drive Unit for Off-the-Shelf Bicycles

2018 ◽  
Vol 9 (3) ◽  
pp. 37 ◽  
Author(s):  
Felix Roemer ◽  
Marius Mrosek ◽  
Simon Schmalfuss ◽  
Markus Lienkamp
Keyword(s):  
Electric Drive ◽  
Single Unit ◽  
Rear Wheel ◽  
Large Majority ◽  
Drive Unit ◽  
Proximity Sensor ◽  
New Approach ◽  
Electric Bicycles

While an increasing number of electric bicycles are sold, the majority is still conventional, i.e., pedal powered.Electric bicycles could raise the share of people cycling in place of more inefficient modes of transportation. This paper investigates and proposes a new approach for an electric drive unit that can easily be attached and detached to a large majority of existing off-the-shelf bicycles to convert them into legal electric assisted bicycles (pedelecs). Different drive mechanisms were investigated and a design with a friction roller at the rear wheel showed the greatest potential. A good solution is achieved with a single unit that incorporates batteries, electronics, motors and sensors in a single enclosure to minimize the mounting time. With a fastening on the seat stay tube using a simple clamp mechanism it can assist the cyclist on most existing bicycles. The legally-required pedal detection is done with an integrated proximity sensor. A prototype is built to prove a simple and nonspecific installation and convenient usage.

Suspension Design and Research for Electric Vehicles with Independent Steering and Driving

2012 ◽  
Vol 479-481 ◽  
pp. 1481-1489 ◽  
Author(s):  
Zhu Rong Dong ◽  
Zhi Jun Deng ◽  
Shao Yun Ren ◽  
Hao Qiu ◽  
Tom Zi Ming Qi
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Geometric Model ◽  
Test Bed ◽  
Suspension Spring ◽  
Electric Automobile ◽  
Simulation And Experiment ◽  
Spring Type ◽  
Stiffness And Damping Coefficient ◽  
Stiffness And Damping

A new suspension using double-wishbone and coil spring type structure is designed for four-wheeled independent steering and driving electric automobile. Firstly, the simplified geometric model is built, and the ADAMS is used to set parametric model. Optimization design was carried out upon the suspension guiding mechanism. The design method of suspension spring stiffness and damping coefficient is presented. And the reasonability of the method is verified by simulation and experiment. The created suspension prototype complies with the design requirements. The suspension test-bed is designed, which can complete t various detection experiments during designing.

Research on Caching Mechanism Based on User Community

2014 ◽  
Vol 672-674 ◽  
pp. 2013-2016
Author(s):  
Li Yan ◽  
Yan Sheng Qu
Keyword(s):  
Flow Dynamics ◽  
Cache Replacement ◽  
Test Bed ◽  
Data Caching ◽  
User Community ◽  
Distributed Caching ◽  
Replacement Algorithm ◽  
Caching Scheme ◽  
Simulation And Experiment ◽  
Caching Mechanism

This paper produced a data caching system framework based on two-layer Chord. Caching is shared by users in domain and hot accessing information is shared by inter-domain users. It effectively reduces the caching system’s overhead. We also introduced cache replacement algorithm based on the user community, especially the user’s influence in the community and the information flow dynamics. The result of simulation and experiment of test-bed environment shows the caching scheme based on user community outperforms most existing distributed caching schemes.

scholarly journals Broadband dispersive free, large, and ultrafast nonlinear material platforms for photonics

Nanophotonics ◽  
2020 ◽  
Vol 9 (15) ◽  
pp. 4609-4618
Author(s):  
Xinxiang Niu ◽  
Xiaoyong Hu ◽  
Cuicui Lu ◽  
Yan Sheng ◽  
Hong Yang ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Nonlinear Optical ◽  
Response Speed ◽  
Nonlinear Material ◽  
Algorithm Optimization ◽  
New Approach ◽  
Ito Film ◽  
Theoretical Predictions ◽  
Structural Dispersion ◽  
Operating Bandwidth

AbstractBroadband dispersion free, large and ultrafast nonlinear material platforms comprise the essential foundation for the study of nonlinear optics, integrated optics, intense field optical physics, and quantum optics. Despite substantial research efforts, such material platforms have not been established up to now because of intrinsic contradictions between large nonlinear optical coefficient, broad operating bandwidth, and ultrafast response time. In this work, a broadband dispersion free, large and ultrafast nonlinear material platform based on broadband epsilon-near-zero (ENZ) material is experimentally demonstrated, which is designed through a novel physical mechanism of combining structural dispersion and material dispersion. The broadband ENZ material is constructed of periodically nanostructured indium tin oxide (ITO) films, and the structure is designed with the help of theoretical predictions combined with algorithm optimization. Within the whole broad ENZ wavelength range (from 1300 to 1500 nm), a wavelength-independent and large average nonlinear refractive index of −4.85 × 10−11 cm2/W, which is enlarged by around 20 times than that of an unstructured ITO film at its single ENZ wavelength, and an ultrafast response speed at the scale of Tbit/s are experimentally reached simultaneously. This work not only provides a new approach for constructing nonlinear optical materials but also lays the material foundation for the application of nanophotonics.

scholarly journals Physics-Based and Data-Enhanced Model for Electric Drive Sizing during System Design of Electrified Powertrains

Vehicles ◽  
2021 ◽  
Vol 3 (3) ◽  
pp. 512-532
Author(s):  
Lukas Decker ◽  
Daniel Förster ◽  
Frank Gauterin ◽  
Martin Doppelbauer
Keyword(s):  
Electric Drive ◽  
System Optimization ◽  
Parameter Variation ◽  
New Approach ◽  
Component Sizing ◽  
Electric Drive System ◽  
Powertrain System ◽  
Proposed Model ◽  
Feasible Range ◽  
Drive Systems

In multi-drive electrified powertrains, the control strategy strongly influences the component load collectives. Due to this interdependency, the component sizing becomes a difficult task. This paper comprehensively analyses different electric drive system sizing methods for multi-drive systems in the literature. Based on this analysis, a new data-enhanced sizing approach is proposed. While the characteristic is depicted with a physics-based polynomial model, a data-enhanced limiting function ensures the parameter variation stays within a physically feasible range. Its beneficial value is demonstrated by applying the new model to a powertrain system optimization. The new approach enables a detailed investigation of the correlations between the characteristic of electric drive systems and the overall vehicle energy consumption for varying topologies. The application results demonstrate the accuracy and benefit of the proposed model.

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