Both engine noise reduction and light engine weight are required from viewpoint of environmental regulation and economic efficiency.
However, countermeasures relying on use of sound-absorbing and insulation materials have limitations from the viewpoints of cost and weight.
“Property-based optimization” rapidly optimizes engine dynamic characteristics through mass and stiffness allocation, enabling efficient evaluation of structural countermeasures for reducing radiated noise while reducing reliance on sound-absorbing and insulation materials.
Extremely fast simulation of engine operational vibration
ESTECH has developed a proprietary (patented) computational method that enables engine vibration simulations to be performed hundreds of times faster than conventional approaches.
“ESTECH.PS-X” is vibration analysis software that implements this proprietary computational principle, enabling easier and faster vibration analysis. By using ESTECH.PS-X, a substantial number of parameter studies and parametric optimizations become possible.
Operating engine dynamic characteristics
Using the Modal Differential Structure (MDS) method, the structural finite element engine block model divides and transformed into arbitral sub structures that have modal parameters corresponding to material elasticity and mass density.
The assembled dynamic characteristics of whole structure can be predicted in a short time while varying stiffness and mass of each sub structure.
By combining PS-X and MDS, the evaluation of about thousands of engine dynamic-characteristic combinations can be performed in several days, and obtain optimized engine fundamental Structure with desired engine NV performance within a realistic time duration.
