Powertrain
The goal of continuously reducing the drive noise in the vehicle requires the simulation of the entire powertrain across various disciplines.
We use modal and frequency response analysis to evaluate vibration behaviour and aggregate acoustics within the frequency range. This specifically involves examining dynamic stiffness, inertia and surface velocities (ERP). Combined static and dynamic reduction of the solid FE structures of the engine and transmission for use in the MKS model completes the range of methods employed.
We analyse the vibration behaviour in the time domain using MKS simulation, incorporating loads and boundary conditions from tests and combustion simulations. Using our CAE methods, we optimise the acoustic properties of all powertrain components.
Electric Motor
The rotor of an electric motor causes vibrations and acoustic effects due to unevenly distributed rotating masses and magnetic forces (cogging torque and ripple torque). These vibrations are transmitted to the body and powertrain.
We simulate and analyse these influences and offer solutions to prevent damage and optimise the overall system. The following components are considered:
Housing
Material, ribs, wall thicknesses, local stiffnesses
Electric Motor Mount
Fixing concept, static and dynamic stiffnesses, dampers
Gearbox
The various components of the gearbox affect the vibration behaviour of the entire drivetrain. Rotating, unevenly distributed masses and the gear teeth cause periodic mechanical vibrations. The stiffness of the components and how the gearbox is mounted have a significant influence on the transmission to the surrounding structure.
We simulate the behaviour of the following components and offer solutions for optimising the overall system:
Gear box housing
Material, ribs, wall thicknesses and local stiffnesses
Shafts
Bending modes and torsional properties
Gear wheels
Gear geometry, backlash and gear howling
Gearbox mounts
Fixing concept, static and dynamic stiffness, and damping behaviour.
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