Your Selections

Matsumoto, Akira
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Evaluation of Equivalent Temperature in a Vehicle Cabin with a Numerical Thermal Manikin (Part 2): Evaluation of Thermal Environment and Equivalent Temperature in a Vehicle Cabin

AGC Inc.-Yoshiichi Ozeki, Seiko Suzuki
Nissan Motor Co., Ltd.-Hajime Oi, Yasushi Ichikawa, Akira Matsumoto
Published 2019-04-02 by SAE International in United States
In the previous paper (Part 1), measurements of equivalent temperature (teq) using a clothed thermal manikin and modeling of the clothed thermal manikin for teq simulation were discussed. In this paper (Part 2), the outline of the proposed mesh-free simulation method is described and comparisons between teq in the calculations and measurements under summer cooling with solar radiation and winter heating without solar radiation conditions in a vehicle cabin are discussed. The key factors for evaluating teq on each body segment of the clothed thermal manikin under cooling and heating conditions are also discussed. In the mesh-free simulation, even if there is a hole or an unnecessary shape on the CAD model, only a group of points whose density is controlled in the simulation area is generated without modifying the CAD model. Therefore, the fluid mesh required by conventional CFD code is not required, and the analysis load is significantly reduced. The most advantageous point is that this mesh-free simulation method satisfies the conservation laws of mass, momentum, and energy. The cabin thermal environment and…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Evaluation of Equivalent Temperature in a Vehicle Cabin with a Numerical Thermal Manikin (Part 1): Measurement of Equivalent Temperature in a Vehicle Cabin and Development of a Numerical Thermal Manikin

AGC Inc.-Yoshiichi Ozeki, Seiko Suzuki
Nissan Motor Co., Ltd.-Hajime Oi, Yasushi Ichikawa, Akira Matsumoto, Fusaaki Takeo
Published 2019-04-02 by SAE International in United States
The present paper is Part 1 of two consecutive studies. Part 1 describes three subjects: definition of the equivalent temperature (teq), measurements of teq using a clothed thermal manikin in a vehicle cabin, and modeling of the clothed thermal manikin for teq simulation. After defining teq, a method for measuring teq with a clothed thermal manikin was examined. Two techniques were proposed in this study: the definition of “the total heat transfer coefficient between the skin surface and the environment in a standard environment (hcal)” based on the thermal insulation of clothing (Icl), and a method of measuring Icl in consideration of the area factor (fcl), which indicates the ratio of the clothing surface to the manikin surface area. Then, teq was measured in an actual vehicle cabin by the proposed method under two conditions: a summer cooling condition with solar radiation and a winter heating condition without solar radiation. The results showed that teq, including the effects of the air temperature, air velocity and thermal radiation, was measured properly. Subsequently, a numerical thermal manikin…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

An Application of Time Variant Flow Visualization Technique to a Vehicle Design (Second Report)

Nissan Motor-Kei Akasaka, Akira Matsumoto, Hiroyuki Shiozawa
Nissan Motor Techno-Takeshi Iizuka
  • Technical Paper
  • 2006-08-0601
Published 2006-09-27 by Society of Automotive Engineers of Japan in Japan
The thermal design of a vehicle has been developed based on a flow analysis of the cabin and engine bay at the early stages of the development process. A simulation system must provide accuracy and rapidness, among other important features, in order to reduce the development period and costs. Designers especially desire a friendly visualization system that can show the fluid and thermal information of unsteady flow computations for improving product quality within a short period of time. This presentation describes the feasibility of a new visualization system for application to the vehicle development process.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

An Approach to Simultaneous Development of the Aerodynamics Performance and the Thermal Management Using CFD

Nissan Motor-Kei Akasaka, Hiroyuki Shiozawa, Kousuke Nakasato, Akira Matsumoto
Nissan Techno-Hiroyuki Aoki
  • Technical Paper
  • 2005-08-0461
Published 2005-09-28 by Society of Automotive Engineers of Japan in Japan
In general, there is considered to be a tradeoff relationship between aerodynamic performance and thermal management; it is difficult to balance during vehicle development. Therefore a method is being developed using CFD that evaluates both performances at the same time, which contributes to reduced development lead-time and balanced performance. At this conference, we would like to introduce our endeavor to achieve these two goals.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Mitsubishi New 12.0-Liter Turbocharged and Intercooled Diesel Engine

Mitsubishi Motors Corp.-Takashi Takahashi, Kohji Takami, Akira Matsumoto
Published 1990-09-01 by SAE International in United States
To meet the increasingly strong demand for high-speed transportation, better fuel economy, higher reliability and the social requirements for more strict Japanese regulations against exhaust and noise emissions, Mitsubishi Motors Corporation has recently developed the 6D40T1 in-line 6-cylinder, 12.0-liter turbocharged and intercooled diesel engine for heavy-duty trucks.This engine meets the 1989 Japanese exhaust emission regulations and has an output of 258 kW.To achieve both fuel economy and good drivability, Mitsubishi's original, electronically-controlled fuel injection system was adopted. The so-called prestroke-controlled fuel injection pump is capable of flexible and precise control of both fuel injection rate and timing.The basic structure of the 6D40T1 was designed with high rigidity to permit high cylinder pressures. In addition, to reduce friction and heat losses, a 4-valve design, roller cam followers with needle roller bearings, and shortened exhaust ports were adopted. As a result, an excellent BSFC level of 189 g/kWh at 1600 rpm was achieved.Laminated-steel type cylinder head gaskets, high camshaft location, and pistons with cooling channels have been adopted in order to attain sufficient reliability and durability.The cylinder…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Noise Characteristics of a Linear Motor-Driven Small-Sized Subway

Traffic Safety and Nuisance Research Institute Ministry of Transport Japan-Seigo Ogata, Hisao Sato, Takayuki Murakami, Shigeru Mori, Akira Matsumoto
Published 1989-05-01 by SAE International in United States
A linear motor-driven subway uses a linear motor for driving and steel wheels for supporting a car body. This system has technical advantages: the car runs at steep grade (Maximum grade is 8%) due to non-adhesive drive, and the bogie can be designed with a great degree of freedom without a rotary motor suspended under a car body.The car has steerable bogies steered by bogie angles and independently rotatable wheels using a powder torque coupling which enable the car to run along a sharp curve. (Minimum curve with 50mR)In these advantages this system surpasses the conventional railway from the viewpoint of noise reduction.
Annotation ability available