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    Geometrical optimization of parallel infinitely variable transmission to decrease vehicle fuel consumption

    , Article Mechanics Based Design of Structures and Machines ; Vol. 42, Issue. 4 , 2014 , Pages 483-501 ; ISSN: 15397734 Delkhosh, M ; Foumani, M. S ; Boroushaki, M ; Sharif University of Technology
    Abstract
    One solution to reduce fuel consumption (FC) of vehicles is to use infinitely variable transmission (IVT) as the power train. However, inappropriate design of IVT leads to an inadequate decrease in the vehicle FC. Therefore, in order to reach a maximum fuel economy, an optimization on the power train proves to be necessary. The present article aims to optimize IVT to decrease the vehicle FC in a driving cycle. The results have revealed that the FC of the vehicle equipped with the optimized IVT is approximately 7% and 4.7% compared to the cases of using the optimized six-speed and nine-speed manual transmissions, respectively  

    Model for analysis of energy flow from tank-to-wheel in a passenger vehicle

    , Article 2005 IEEE Vehicle Power and Propulsion Conference, VPPC, Chicago, IL, 7 September 2005 through 9 September 2005 ; Volume 2005 , 2005 , Pages 150-153 ; 0780392809 (ISBN); 9780780392809 (ISBN) Farzaneh, H ; Saboohi, Y ; Sharif University of Technology
    2005
    Abstract
    Analysis of multi dimensional interactions of flow of energy in passenger vehicle is a complex task that necessitates development and utilization of analytical tools. Development of analytical tools with high complexity is usually based on conclusions of many concepts and theories from different scientific disciplines. In this approach, Passenger vehicle is supposed to be organized in the form of a firm and appears in the market that oriented towards establishing an effective energy supply system which may be identified as delivering the product (person per mileage removable) with minimum operation costs. To this end, an optimization model named POWER software founded on theory of firm of... 

    Optimisation and comparison of different powertrain layouts for parallel hybrid electric vehicles equipped with continuous transmission

    , Article International Journal of Heavy Vehicle Systems ; Volume 24, Issue 1 , 2017 , Pages 45-64 ; 1744232X (ISSN) Delkhosh, M ; Foumani, M. S ; Lashgarian Azad, N ; Sharif University of Technology
    Inderscience Enterprises Ltd  2017
    Abstract
    The development of an efficient hybrid electric vehicle (HEV) platform needs an optimal design of its powertrain layout. This study is concerned with parallel HEVs (PHEVs) equipped with continuous transmission. First, different types of continuous transmissions, including continuously variable transmission (CVT), power-split CVT (PS-CVT) and multi-fixed ratio PS-CVT (MF-CVT), are discussed and their simulation models are presented. Also, various combinations of these continuous transmissions with PHEV configurations (namely, pre-transmission and posttransmission configurations) are introduced. Then, for a given PHEV model, several powertrain layouts resulting from combining the considered... 

    Throughput analysis of IEEE 802.11-based vehicular ad hoc networks

    , Article IET Communications ; Volume 5, Issue 14 , Sept , 2011 , Pages 1954-1963 ; 17518628 (ISSN) Etemadi, N ; Ashtiani, F ; Sharif University of Technology
    2011
    Abstract
    In this study, the authors propose an analytical model to evaluate the maximum stable throughput for unicast services in vehicular ad hoc networks. In this respect, the authors employ two queueing networks (QNs) to model the mobility patterns of the vehicles as well as the multi-hop packet transmission scenario. In the proposed model, the authors map the features of IEEE 802.11, as well as the details of multi-hop packet transmission, regarding the dynamic status of vehicles, onto suitable parameters of the QNs. In the authors' modelling approach, they take the details of MAC and routing schemes into account by classifying the vehicles based on their mobility patterns and considering their... 

    A supervisory control policy over an acoustic communication network

    , Article International Journal of Control ; Volume 88, Issue 5 , Dec , 2015 , Pages 946-958 ; 00207179 (ISSN) Farhadi, A ; Dumon, J ; Canudas De Wit, C ; Sharif University of Technology
    Taylor and Francis Ltd  2015
    Abstract
    This paper presents a supervisory multi-agent control policy over an acoustic communication network subject to imperfections (packet dropout and transmission delay) for localisation of an underwater flow source (e.g., source of chemical pollution, fresh water, etc.) with an unknown location at the bottom of the ocean. A two-loop control policy combined with a coding strategy for reliable communication is presented to perform the above task. A simulator is developed and used to evaluate the trade-offs between quality of communication, transmission delay and control for a fleet of autonomous underwater vehicles supervised over a noisy acoustic communication network by an autonomous surface... 

    A modified control strategy for parallel hybrid electric vehicles equipped with continuously variable transmission

    , Article Scientia Iranica ; Volume 23, Issue 3 , 2016 , Pages 966-975 ; 10263098 (ISSN) Delkhosh, M ; Foumani, M. S ; Falahati, F ; Sharif University of Technology
    Sharif University of Technology  2016
    Abstract
    This paper aims to establish a control strategy for parallel hybrid electric vehicles equipped with full-toroidal Continuously Variable Transmission (CVT). First, the advantages of CVT are elucidated. Afterwards, a modified control strategy on the base of Baseline static Control Strategy (BCS) is proposed. Employing this strategy, in some moments, the engine operates in its fuel-optimal point to decrease the vehicle Fuel Consumption (FC). It is demonstrated that the modifications in BCS are applicable using a CVT as the power train. In order to investigate the implemented modification, an optimization on the proposed control strategy and BCS in SC03 driving cycle is accomplished and then,... 

    Different optimization criteria for vehicle seat suspension control: Position versus acceleration

    , Article Proceedings of the ASME Design Engineering Technical Conference, 30 August 2009 through 2 September 2009, San Diego, CA ; Volume 6 , 2009 , Pages 1053-1059 ; 9780791849033 (ISBN) Hashemnia, S ; Ahmadian, M. T ; Sharif University of Technology
    Abstract
    This paper addresses the effect of different optimization criteria for the control purpose of vehicle suspension. In the present study, active vibration control system for a 5 degree-of-freedom (DoF) pitch-plane suspension model with bounce and pitch motions is investigated. In the proposed vehicle model, the impact of the wheel-axle-brake assemblies' masses is also considered. The developed model is controlled using a fuzzy logic controller (FLC) to minimize the vibration of the driver's seat. The controller is designed to control the applied force to the seat. Furthermore, in order to determine the optimal value of fuzzy system parameters, genetic algorithm (GA) optimization search is used... 

    Hybrid approach to analyze the impact of vehicular traffic on performance of 802.11p protocol for safety communications in vehicular ad hoc networks: a quantitative analysis

    , Article Wireless Personal Communications ; Volume 97, Issue 3 , 2017 , Pages 4493-4528 ; 09296212 (ISSN) Ghafourian Ghahramani, S. A. A ; Afshin Hemmatyar, A. M ; Sharif University of Technology
    Abstract
    The rapid developments in wireless communications have introduced the vehicular ad hoc networks as an efficient tool to improve the safety of traffic through Dedicated Short Range Communications systems on highways. This paper addresses the broadcast mode of the 802.11p protocol and it quantitatively analyzes the impact of the highway vehicular traffic on its performance in terms of the packet delivery ratio and the packet transmission delay. To this aim, we propose to consider the number of the contending vehicles as a traffic-dependent stochastic counting process, which can be computed by analyzing the inter-vehicle spacing distribution in different traffic conditions. Based on the... 

    Extended opportunity cost model to find near equilibrium electricity prices under non-convexities

    , Article Applied Energy ; Volume 240 , 2019 , Pages 251-264 ; 03062619 (ISSN) Shavandi, H ; Pirnia, M ; Fuller, J. D ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    This paper finds near equilibrium prices for electricity markets with non-convexities due to binary variables, in order to reduce the market participants’ opportunity costs, such as generators’ unrecovered costs. The opportunity cost is defined as the difference between the profit when the instructions of the market operator are followed and when the market participants can freely make their own decisions based on the market prices. We use the minimum complementarity approximation to the minimum total opportunity cost model, from previous research, with tests on a much more realistic unit commitment model than in previous research, including features such as reserve requirements, ramping... 

    Optimization of multiple transmission layouts for minimal energy consumption of a battery electric vehicle

    , Article Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2382-2393 ; 10263098 (ISSN) Farjam, T ; Foumani, M. S ; Delkhosh, M ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    Battery Electric Vehicles (BEVs) are a promising solution for reducing the impacts of passenger vehicles on the environment. However, their driving range is restricted due to the limitations of battery technologies. This range can be extended by adoption of multiple-speed transmissions. Most of the comparisons in the related studies are based on non-optimal designs or limited to modal driving cycles. Furthermore, the impact of Power-Split. Continuously Variable Transmission (PS-CVT) layout with type III power How on the power consumption of BEVs has never been examined. In this paper, single-, two-, and three-speed transmissions along with PS-C'VTs with type I and III power flows are... 

    Optimization of multiple transmission layouts for minimal energy consumption of a battery electric vehicle

    , Article Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2382-2393 ; 10263098 (ISSN) Farjam, T ; Saadat Foumani , M ; Delkhosh, M ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    Battery Electric Vehicles (BEVs) are a promising solution for reducing the impacts of passenger vehicles on the environment. However, their driving range is restricted due to the limitations of battery technologies. This range can be extended by adoption of multiple-speed transmissions. Most of the comparisons in the related studies are based on non-optimal designs or limited to modal driving cycles. Furthermore, the impact of Power-Split. Continuously Variable Transmission (PS-CVT) layout with type III power How on the power consumption of BEVs has never been examined. In this paper, single-, two-, and three-speed transmissions along with PS-C'VTs with type I and III power flows are... 

    Tele-operation of autonomous vehicles over additive white Gaussian noise channel

    , Article Scientia Iranica ; Volume 28, Issue 3 , 2021 , Pages 1592-1605 ; 10263098 (ISSN) Parsa, A ; Farhadi, A ; Sharif University of Technology
    Sharif University of Technology  2021
    Abstract
    This paper is concerned with the tele-operation of autonomous vehicles over analog Additive White Gaussian Noise (AWGN) channel, which is subject to transmission noise and power constraint. The nonlinear dynamic of autonomous vehicles is described by the unicycle model and is cascaded with a bandpass filter acting as encoder. Using the describing function method, the nonlinear dynamic of autonomous vehicles is represented by an approximate linear system. Then, the available results for linear control over analog AWGN channel are extended to account for linear continuous time systems with non-real valued and multiple real valued eigenvalues and for tracking a non-zero reference signal.... 

    Model predictive control of a hydraulic actuator in torque applying system of a mechanically closed-loop test rig for the helicopter gearbox

    , Article Aviation ; Volume 23, Issue 4 , 2020 , Pages 143-153 Parvaresh, A ; Mardani, M ; Sharif University of Technology
    Vilnius Gediminas Technical University  2020
    Abstract
    Transmission health is an important factor in safety and maintenance costs in industries, so construction of test rigs for testing high-powered gearboxes under different operating conditions of helicopters is required. The studied test rig, which is developed at Sharif University of Technology branch of ACECR (Academic Centre of Education, Culture and Research) is mainly used for testing high-powered gearboxes through a mechanically closed-loop procedure. For providing a variety of speeds and torques in test rigs, torque applying system is required. According to generation of higher forces, reduced size of equipment and accurate positioning, electro hydraulic actuators (EHAs) are used for... 

    A modified 802.11-based MAC scheme to assure fair access for vehicle-to-roadside communications

    , Article Computer Communications ; Volume 31, Issue 12 , 30 July , 2008 , Pages 2898-2906 ; 01403664 (ISSN) Karamad, E ; Ashtiani, F ; Sharif University of Technology
    2008
    Abstract
    Vehicular ad hoc networks (VANets) are special cases of mobile ad hoc networks (MANets) in which the mobility pattern is very different. Actually, the topology of the network in VANets changes more often and the variance of speeds is high. Such characteristics lead to fairness problem in VANets, considered in this paper. In fact, vehicles with different speeds have their different limited time to communicate with an access point (AP). This attribute adversely affects the chance of a fast moving vehicle in communicating with the access point. We propose a modified 802.11 DCF channel access scheme as a solution to the problem. The proposed scheme adjusts the probability of transmission at a...