Development of Bionic Cooling Fan for Radiator

Laurent Art･Peter Kroner (MAHLE Behr)･Hotaka Tsuchiya (MAHLE Behr Japan)

As BEV batteries become larger, one of the problems users face is the electric fan noise that occurs during fast charging. To address this issue, MAHLE has adopted bionic design in the fan design and developed a new electric fan based on the feathers of an owl. By optimizing the shape and thickness of the blades, we achieved a noise reduction of up to 4 dB.

Proposal of entire NVH simulation process for eMotor under various load spectra and correlation study to measurements

Anton Plank･Oliver Grieshofer (Magna Powertrain Engineering Center Steyr GmbH)･Fumio Numata･Kazumasa Kato (Magna International Japan)

The general acoustic behavior of electric drives and their tonal noise is well known and one of the main challenges in integrating electric drives in passenger cars. Common simulation methods, like finite element and multi body system analyzes, have been successfully applied in the electric drive development. However, to combine eMotor excitation and structural dynamic behavior in the relevant frequency range with adequate accuracy, models are getting quite complex and simulation efforts are increasing significantly. Semi-automated set-up of analysis and post-processing reduces the manual work and enables analyzing a large set of data. An introduction to this process is shown.

Seat Structure with High Damping Mechanism to Reduce Body Motion

Hideki Hitomi･Kota Koyanagi･Naoharu Tamura (Honda Techno Fort)･Yukio Kobayashi･Takafumi Tomida･Osamu Inaba (Honda Motor)･Takayuki Toyoshima (Honda Racing)

A seat structure that improves ride comfort was investigated. The seat frame was made into a pan structure by removing the elastic elements. The seat pad has a structure that generates damping force through air resistance, resulting in high damping. Experiments using a prototype seat revealed that this structure is effective in reducing vibration amplification, increasing the shock absorption effect, and suppressing unpleasant shaking.

Dynamic Substructuring for Predictive Approach of EPS Operation Noise

Hirotaka Kamano (Toyota Motor)

Dynamic Substructuring represents a principal method for performance prediction, whereby the dynamics of the system is analysed by means of its individual components. The present study demonstrates the possibility of calculating the response of the assembly by experimental modelling of substructures, specifically the EPS gearbox, bushings and the subframe. The influence of various measurement methods on the prediction is also investigated.

Effects of Inclusions at Joint Interface on Vibration Characteristics of Bolted Joints

Tristan Samuel Britton (Fujimori)･Keisuke Inoue･Yoshinao Kishimoto･Yukiyoshi Kobayashi･Shogo Isobe･Yuuki Kawaharabashi･Satoru Kuga (Tokyo City University)

Bolted joints are used broadly on automotive structures, and it is known that bolted joint vibrational characteristics (ex: Natural frequency, damping ratio) are available to be simulated from the interface’s tribology. This study has been evaluated by experiments and finite element methods for inserting inclusions such as elastic rubber material and adhesive between the joint’s interfaces, that how effects to vibrational characteristics for bolted joints.