Search results for "Drive"

A Simple Software-based Resolver To Digital Conversion System

2022

In this paper, a software-based resolver to digital converter (RDC) is proposed. The hardware signal conditioning circuit is realized using common electronic components, while the algorithm can be implemented either using a microcontroller or an FPGA. Its validation and performance analysis has been carried out using an interior permanent magnet synchronous machine drive and, with comparative purposes, an LTN Servotechnik 1024 ppr incremental encoder. Tests show that the proposed RDC is characterized by a good dynamic response and precision, moreover, due to low computational demand, it can be successfully adopted without significant extra cost.

Modeling risk perception in ATIS context through Fuzzy Logic

2011

Abstract This research is aimed at investigating the effect of accuracy of ATIS (Advanced Traveller Information Systems) in terms of route choices and travellers concordance to informative system. A Stated Preference Experiment has been made by using a Travel Simulator developed at the Technische Universiteit of Delft (The Netherlands). During the experiment respondents have been asked to make repeated route choices in presence of ATIS. Two kinds of information have been tested: descriptive (respondents are provided with the estimated travel times on each route), and prescriptive (respondents are provided with the estimated shortest route). For each kind of information four levels of accura…

Digital demodulation for fast set-up of sensorless PMSM electrical drives based on magnetic anisotropy

2009

This paper presents a demodulation algorithm applied to the sensorless control of permanent magnet synchronous motors (PMSM). The sensorless control technique reported in this paper is based on the injection of high frequency voltages to the stator so that the motor currents contain information on the rotor position. This information is then extracted by an appropriate demodulation technique. The presented demodulation algorithm is based on spectral analysis of the signal produced by the sensorless control technique because this is fully characterized and presents not ambiguous correlation between current harmonic content and rotor position. The most important feature of the demodulation al…

Joint Influence of Transverse Compression and Shear-Flexural Stiffness on Rubber V-Belt Mechanics

2009

The elasto-mechanical behavior of a rubber V-belt in the neighborhood of the seating and unseating regions of the pulley is affected by the transverse belt compliance, which produces a gradual radial penetration into the groove and by the shear-flexural deformation, which arches the belt line along the free strand away from the ideal straight path. These effects are always analyzed separately in the literature, but are in close correlation with each other. This lecture describes the matching between the free strand and the wrap region, showing a remarkable reduction of the belt arching and of the contact losses, with respect to the conventional theory.

Simulation d’un Affichage Tête Haute - Réalité Augmentée pour l’aide visuelle à la conduite automobile

2016

Head-Up Display is the emerging solution for visual aid while driving a car, especially during reduced visibility conditions, such as bad weather or when the road is poorly lighted. The HUD device allows to project virtual information in the central field of view of the driving scene, enabling the driver to keep his attention on the road. The visual perception of the driver is therefore augmented, with a coexistence between the real and virtual world. However, it is necessary to ensure an optimal setting in order to guarantee the good perception of the virtual information, and allow drivers to take appropriate actions at the right moment. This thesis project is dedicated to study three impo…

Registration of arbitrary multi-view 3D acquisitions

2013

International audience; To register 3D meshes representing smooth surfaces we track the 3D digitization system using photogrammetric techniques and calibrations. We present an example by digitizing a 800 mm x 600 mm portion of a car door. To increase the tracking accuracy the 3D scanner is placed in a cubic frame of side 0.5 m covered with 78 targets. The target frame moves in a volume that is approximately 1100 mm x 850 mm x 900 mm, to digitize the area of interest. Using four cameras this target frame is tracked with of an accuracy of 0.03 mm spatially and 0.180 mrad angularly. A registration accuracy between 0.1 mm and 2 mm is reached. This method can be used for the registration of mesh…

Datorzinātne un informācijas tehnoloģijas: Datu bāzes un Informācijas sistēmas

2010

Test-driven lecturing

2012

One can easily compare the current style of teaching and lecturing to the so called waterfall model of software development. We first design the course, then execute it, and in the end we make tests to see, if everything went well. As with waterfall model, the assessment comes too late, if anything fails.Therefore, we need a lecturing model which entwines assessment into course execution. Test-driven development (TDD) is a model of software development in which the computer program is designed by writing first small tests that assure the meeting of the requirements. In test-driven lecturing, students first take tests to show how well they master the topics to be discussed. In this way both …

Model-Driven Development Approach for Providing Smart Home Services

2009

Smart home is about the application of automation techniques for the comfort and security of residents' privately owned homes. In a smart home environment, different and independent embedded devices provide services that can be freely used by others, in the sense of service invocation. This paper presents our idea of using Model Driven Development (MDD) for the composition of existing services, by which we aim at demonstrating how new smart home services will be promoted.

A Data-Driven Architecture for Personalized QoE Management in 5G Wireless Networks

2017

With the emergence of a variety of new wireless network types, business types, and QoS in a more autonomic, diverse, and interactive manner, it is envisioned that a new era of personalized services has arrived, which emphasizes users' requirements and service experiences. As a result, users' QoE will become one of the key features in 5G/future networks. In this article, we first review the state of the art of QoE research from several perspectives, including definition, influencing factors, assessment methods, QoE models, and control methods. Then a data-driven architecture for enhancing personalized QoE is proposed for 5G networks. Under this architecture, we specifically propose a two-ste…