Proposal of a Simulation Model Considering Engine Block Mating Surfaces

Natsuki Takahashi･Masato Mikami (Yamaguchi University)

Existing research on combustion-induced vibrations uses Wavelet cross-correlation analysis to determine the transmission delay of combustion-induced vibrations in the single-cylinder diesel engine, and investigates the transmission path. In this study, we improved the simulation software that simulates an actual engine, and investigated from a structural perspective a method to bring the vibration acceleration on the outer wall of the engine closer to the experimental value.

Enhancement of Two-motor Hybrid Engine Start-up Vibration Performance by Motor Starting Torque Control Considering Power Plant Resonance

Satoshi Watanabe (Honda Motor)･Koichi Tahara･Tomohiro Kitayama (Auto Technic Japan)

Two-motor hybrid engine starting vibration has large level differences depending on the crankshaft starting angle. This study focuses on the power plant rigid-body resonance, and reduces the power plant vibration peak at different crankshaft-start angles, which is formed when the engine speed rise period and the power plant rigid-body resonance match, by changing the engine speed rise period to improve the starting vibration performance.

Improvement of NVH Performance and AWD Performance by Applying a Torsional Damper to 4-wheel Drive Vehicles with CVT

Hiroyuki Fukudome･Satoshi Yamashita･Jun Fujita･Tomohiko Tezuka (Honda Motor)

This paper presents a combined vehicle testing and CAE modelling approach to apply the torsional damper in AWD vehicle equipped with CVT. By applying it in the optimal position of propeller shaft, NVH performance related to the torsional resonance in the drivetrain system was improved without worsening the vibration caused by rotational imbalance. Furthermore, this approach provided greater flexibility in rear drive force settings, which improved AWD performance too.

Establishment of Factors Analysis for Equipment Differences in Sound and Vibration Measurement in the Transmission Unit and Determination Method of Appropriate Jig Specifications

Toshiki Nagamine･Takuya Kusakabe･Hiroshi Sho･Toshio Fuwa･Kazuki Takase (Toyota Motor)

When introducing evaluation equipment to measure noise and vibration in transmission units, we encountered an issue with obtaining different results compared to other equipment. To address this, we modified the installation fixture specifications for the transmission unit.
We created a realistic equipment model based on actual measurements and performed a factor analysis in collaboration with the unit. This analysis allowed us to determine the fixture specifications in advance.

A Planetary Gear Noise Analysis based on the R-S Coupling Principle

Masatoshi Kanno･Hiroyuki Shintani･Masanori Ogawa (Estech)

As the smallsized and high-speed transaxles prevail, demands for the accurate prediction technology of the planetary gear noise are increasing.The R-S coupling principle considers the gear rotation in the frequency domain and can predict the sideband vibration.This report extends the subject of the R-S coupling principle from parallel 3-shaft e-Axles to devices with planetary gears, and reports its usefulness.

Gear Structure Optimization of Diesel Engines using Generative Design

Seiya Yamagishi･Kazuya Okazaki･Yasuhiro Ishikawa･Kennichi Yamashita (Isuzu Advanced Engineering Center)

Generative design was applied to commercial diesel engines to reduce weight significantly. A gear train model that can take account of three-dimensional elastic deformation was used to investigate adverse effects due to reduced stiffness. The geometry study was conducted to minimize the effect of the stiffness reduction on the deterioration of the meshing. The effect of friction reduction by replacing conventional items was confirmed by actual equipment experiments.