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Providing the Ecosystem for Next Generation Vehicle Powertrains - Altair - Romax White Paper
While designers are juggling with multiphysics constraints to deliver their next vehicles generation in time,
together Altair and Romax Technology offer a complete model-based, multiphysics solution for design, simulation and optimization of complex electro-mechanical powertrains. With extensive expertise, we are available to respond to questions from different design teams to help dive down into the technologies, including motors, controllers, gearbox, noise and vibration, oiling and cooling.

Magneto Vibro Acoustic Design of PWM Fed Induction Machines
Induction Motors (IM) are widely used in various industries. To ensure their speed control, IM will be supplied with pulse width modulation (PWM). This kind of supply, can impact efficiency of the motor and degrade its vibro-acoustic behavior, generating noise nuisance. To tackle these technical challenges and ensure best-in class acoustic comfort for users, it is necessary to design a quiet e-motors at the early stage of design.
The first aim of this paper is to show a new method to reduce noise and vibration due to PWM supply of induction machine. The proposed approach allows the passive reduction of air-gap flux density harmonics in an induction machine. The second interest, is to show a new method to analyze the vibro-acoustic behavior of a PWM-fed IM. The method is fully finite element (FE) computation. Finally, the third interest of this article, is to compare noise and vibration results between the proposed FE method, magneto-vibro-acoustic coupling and measurements. Good agreement between measurements and computation will be shown.


Multi-physics Electric Motor Optimization for Noise Reduction
In an electric machine, the torque is generated by electromagnetic forces which also create some parasitic vibrations of the stator. These vibrations excite the mechanical structure on which the motor is fixed and generate sound. When designing the electric machine, this aspect has to be taken into account from the start since it depends on the harmonic content of the currents that feed the machine, on the shapes of the rotor and stator, and on the interaction of the electric frequencies with the natural mechanical modes of the structure.
To simulate this phenomenon, a coupling between electromagnetic calculations and vibration analysis has to be set-up. Some optimization procedure can also be added in order to reduce the noise.
In what follows, it is shown how Altair HyperWorks suite; specifically FluxTM, OptiStruct®, HyperMesh® and HyperStudy® products have been successfully used to perform a multi-physics optimization for noise reduction in a fuel pump permanent magnet motor.

OptiStruct for Structural Analysis: Not Just for Optimizations Anymore
Reprint of Engineering.com article on OptiStruct as a structural analysis tool with built-in optimization capabilities

Less Interior Squeak and Rattle Noise Using a Simulation Driven Design Approach
In the development of new vehicles, the PSA Group aimed to detect Squeak and Rattle (S&R) problems before availability of physical testing. This led to a collaboration between PSA’s method development engineering team and Altair’s domain experts.

Brake Noise Prediction Using Altair Multi-body Simulation
The level of noise transmitted to the passengers of a vehicle can drastically impact a passenger’s comfort. Brake noise will give the customer an impression of poor product quality and can thus damage the quality image of the company. Within the automotive industry,
the study of mode coupling instability by the use of FEM and modal complex analysis is widespread to reduce this phenomenon.


[AOP]岐阜大学 - こもり音予測のための1DCAE用ビームモデル
こもり音予測のための1DCAE用ビームモデル/Beam model to predict interior booming noise in concept design stage - 岐阜大学/Gifu University [2015.05]


[AOP]東京大学 - 転てつ付属装置の磨耗現象解明のための有限要素法解析
転てつ付属装置の磨耗現象解明のための有限要素法解析 / Finite Element Analysis for Wearing Mechanism on Attachment Device of Railroad Switch - 東京大学 / University of Tokyo [15.02]


Daimler - Calculation of Optimal Damping Placement in a Vehicle Interior
One of the most difficult jobs of a NVH Analyst is to sift through a seemingly endless set of results and find the key conclusions that will improve a design. Different assumptions and different subsets of data can give very different conclusions. This paper compares acoustic results calculated for a Class 8 heavy duty truck cab to choose an optimal configuration of damping material. The design was evaluated for structure and air-borne inputs, but only structure-borne inputs are considered in this paper.

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