Privious Issue

Volume 43 Number 4 (2012.12)

Special Feature

Vehicle Engineering

Part I. Special Feature


Research Reports

  • 2. Clarification and Achievement of Theoretical Limitation in Vehicle Dynamics Integrated ManagementPDF(665kB)

    pages 1-10
    Eiichi Ono, Yoshikazu Hattori, Hiroaki Aizawa, Hiroaki Kato, Shinichi Tagawa and Satoru Niwa

    In this article, a vehicle dynamics integrated control algorithm using an on-line nonlinear optimization method is proposed for 4-wheel distributed steering and 4-wheel distributed traction/braking systems. The convexity of this problem is shown, and so global optimality of the convergent solution of the recursive algorithm is guaranteed. This implies that the theoretical limited performance of vehicle dynamics integrated control is clarified.

  • 3. Development of an Active Human FE Model with 3D Geometry of Muscles for Simulating Driver's Bracing and Evasive Maneuvers in Pre-crashPDF(1,064kB)

    pages 11-18
    Masami Iwamoto and Yuko Nakahira

    We have developed an active human FE model with 3D geometry of muscles for simulating occupant bracing and evasive maneuvers in pre-crash. The developed model is a unique and practical tool for the detailed investigation on effects of muscle activation in pre-crash for occupant behaviors and injuries under various impact situations.

  • 4. Four-wheel Active Steering Control Based on Human SensitivityPDF(1,454kB)

    pages 19-31
    Yoshikazu Hattori, Eiichi Ono, Katsuhiko Fukui and Yuji Muragishi

    Target vehicle dynamics to enhance a driver’s perception of a vehicle’s agility and stability in yaw and lateral motion have been suggested. Human sensitivity is a significant factor in determining such targets. This paper proposes a control design concept for a four-wheel active steering system based on four representative human sensitivities.

  • 5. Numerical Simulations of Aeroacoustic Fields around AutomobilesPDF(1,492kB)

    pages 33-45
    Yoshihiro Kato

    A numerical method for simulating the wind noise around automobile A-pillars and rear-view mirrors has been developed. The equations separated from the compressible flow equations are defined as the governing equations for acoustics by means of the Mach number expansion. The acoustic fields are calculated by the finite volume method with a non-oscillatory and higher-order discretization scheme, that is, the WENO scheme. From the results around the automobile A-pillars and mirrors, the present method makes it possible to visualize the acoustic fields directly and shows how the wind noise is generated and propagated.

  • 6. Study on Roller Behavior and Thrust Force of Tripod Constant Velocity Joint PDF(1,467kB)

    pages 47-57
    Hideki Sugiura, Yoshiteru Mizutani , Tsugiharu Matsunaga, Yosei Ando and Isashi Kashiwagi

    To determine the mechanisms inducing the thrust force of a tripod constant velocity joint, a detailed analysis focused on one roller is performed based on a multibody dynamics approach. By simulating contact and friction forces among multiple parts, it is clarified that the principal factor inducing the thrust force is the friction force based on three kind of sliding velocities between a roller and a groove.

  • Upper figure: Reprinted from J. Syst. Des. Dyn., Vol. 4, No. 6 (2010), pp. 857-870, c 2010 The Japan Society of Mechanical Engineers.

Part II. Highlighted Papers


  • 7. Preparation and Properties of Biopolymers Based on Isosorbide (1, 4:3, 6-Dianhydro-D-sorbitol) PDF(1,246kB)

    pages 59-67
    Makoto Kato and Chi-Han Lee

    We have successfully synthesized biopolyurethanes and biopolycarbonates based on isosorbide. Furthermore, in the case of biopolycarbonates, we have succeeded in preparing nanocomposites consisting of biopolycarbonates and clay mineral. These biopolymers and nanocomposites exhibited excellent thermal properties and high moduli due to the rigid isosorbide. These properties make them attractive as high-performance materials.

Research Reports

  • 8. Lattice Boltzmann Method for the Convection-diffusion EquationPDF(1,001kB)

    pages 69-79
    Hiroaki Yoshida and Makoto Nagaoka

    A lattice Boltzrnann method with a multiple-relaxation-time collision operator for the convection-diffusion equation is presented. The applicability of the present method to the anisotropic diffusion process is demonstrated by means of some numerical examples. A novel boundary treatment that improves the accuracy on complex boundaries is also described.