International Journal of Automotive Engineering
Online ISSN : 2185-0992
Print ISSN : 2185-0984
ISSN-L : 2185-0992
Volume 7 , Issue 1
Showing 1-7 articles out of 7 articles from the selected issue
Technical Paper
  • Karpouzas Georgios K., Papoutsis-Kiachagias Evangelos M., Schumacher T ...
    2016 Volume 7 Issue 1 Pages 1-7
    Published: 2016
    Released: March 25, 2016
    JOURNALS OPEN ACCESS
    Adjoint optimization is an exciting and fast growing field that has many applications in the automotive industry. We focus on the usage of adjoint for the optimization of aerodynamic performance. While adjoint methods have come to the attention of mainstream CFD through inclusion in prominent commercial codes, most of the available tools are severely limited, precluding productive use in this field. We detail a methodology that is based on the continuous adjoint method and is implemented in an Open Source framework. While more mathematically demanding in terms of its derivation, the continuous adjoint method requires orders of magnitude fewer resources without sacrificing significant accuracy. In this paper continuous adjoint methods are used for calculating gradients of aerodynamic objective functions (drag, lift, moments etc.) in applications with a huge number of design variables. Methodologies that accept either steady-state RANS(1)(2)(3) or time averaged DES(4)(6) as primal flow input are outlined and extensions to improve the accuracy of previously published methods are detailed. Finally, a novel methodology, based on volumetric B-splines to translate the surface sensitivities produced by the adjoint into optimized shapes, is introduced and showcased.
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Research Paper
  • Long Qian, Xie Qiwei, Seiichi Mita, Kazuhisa Ishimaru, Noriaki Shirai
    2016 Volume 7 Issue 1 Pages 9-14
    Published: 2016
    Released: March 25, 2016
    JOURNALS OPEN ACCESS
    Small size objects which dimensions are around 0.15m are one of the major security risks to driving vehicles in the highway. Lidar and radar are hard to detect this kind of objects due to the sparsity of their detecting signal. Vision based methods are possible to solve this problem because camera can generate dense information. We propose a new method to detection small objects in the highway based on stereo vision. This method uses Multi-Path-Viterbi algorithm to obtain dense depth information of stereo images. Based on the depth information, road surface can be detected. Objects on road can be mapped to the 3D space to determine their size and location, then small objects dangerous to the host Vehicle can be recognized and located.
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  • Chinmoy Pal, Tomosaburo Okabe, Vimalathithan Kulothungan, Narahari San ...
    2016 Volume 7 Issue 1 Pages 15-22
    Published: 2016
    Released: March 25, 2016
    JOURNALS OPEN ACCESS
    To improve the accuracy of Injury Severity Prediction in the event of vehicle crash, a new methodology is proposed using the US vehicle accident database (NASS-CDS). This proposed method is an extension of the base algorithm introduced by Kononen et al. in which, some of the additional variables were introduced and branched logistic regression methodology was used. Results suggest that the proposed branching method has some advantage over the base algorithm due to better linearization of the complex multidimensional non-linear relationship of the input and output variables.
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Technical Paper
  • Mary Elizabeth Koban
    2016 Volume 7 Issue 1 Pages 23-28
    Published: 2016
    Released: March 25, 2016
    JOURNALS OPEN ACCESS
    HFO-1234yf is a low GWP refrigerant developed for automotive air-conditioning (A/C) systems to replace HFC-134a. Industry-wide risk assessments found that HFO-1234yf can be safely used in mobile A/C applications with results previously presented. Various global automotive OEMs have transitioned to HFO-1234yf at selected manufacturing sites in different regions. This paper documents critical steps for successful transition, including installation, commissioning and startup of storage and vehicle charging facilities. Observations will also be shared concerning potential pit-falls that have been encountered during new refrigerant implementation at these sites
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Research Paper
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