In order to fully understand the vibration behavior of a system, engineers perform a transfer path analysis (TPA) that helps them identify and assess structure-borne and airborne energy transfer routes, from the excitation source to a given receiver location.
Transfer path analysis quantifies the various sources and their paths and figures out which ones contribute the most to the noise issues and which ones cancel each other out. From the quantified and modeled sources and paths, it becomes a relatively straightforward design task to optimize vibro-acoustic and the noise, vibration, and harshness (NVH) performance of the system.
Verify noise contributions using a time-domain transfer path analysis model. This model allows you to listen to the recorded sound of the powertrain components, tire friction, wind and other contributors. It extends the use of transfer path analysis models to sound design and sound quality engineering. This process can also be applied to transient events such as engine restart and acceleration pedal tip-in/tip-out.
Predicting the in-vehicle noise contribution of components, such as the powertrain, tire, HVAC and steering system during early development is tremendously challenging. To avoid endless design iterations, engineers need modular technologies that leverage measured individual component models into full-vehicle noise predictions.
This is exactly the scope of component-based TPA. The process starts by characterizing the source loads independently from the receiver structure, based on acquired free velocities or blocked forces. Next, using sub-structuring techniques, engineers can study the component-level NVH performance without having to physically create the full vehicle in all its variants. Such early predictions help to avoid issues and allow a more realistic design target setting.
Powertrain NVH engineers will seek to trace the flow of vibro-acoustic energy from the powertrain and identify path contributions in order to analyze the variables that can have an effect on the vibro-acoustic results. Transfer path analysis allows you to assess several variants and compare and evaluate results. It plays a crucial role in the optimization process of the full vehicle NVH performance.
Lowering pass-by noise level limits, updated certification standards, and the introduction of new technologies force NVH teams to adopt innovative and efficient pass-by noise engineering methods. Rely on our indoor and outdoor pass-by noise certification solutions to speed up testing against a wide range of institutional regulations and directives. Our solutions include test-based engineering methods to design vehicle sounds and predict pass-by noise levels.
Road noise is a major contributor to overall interior noise levels. With hybrid or electric vehicles, road noise is often more prominent as it not masked by powertrain noise. Transfer path analysis allows separation of the airborne and structure-borne contributions, as well as front and rear axle and suspension contributions. It helps identify root causes of excessive noise and validates chassis and body modifications with the goal of increasing passenger comfort.
You can accurately create or assemble systems in a virtual environment using test and simulation data, easily evaluate the effect of modifications or components at different development stages and maximize the usage of all the data in your organization. The user interface is easy-to-use, enabling non-experts to accurately predict the final product noise, vibration, and harshness (NVH) performance. Our solution allows your development team to deliver excellent NVH performance while keeping development times and costs under control.
Identify the root causes of noise and vibration issues with experimental transfer path analysis. This method provides deep insight into the system’s noise and vibration behavior. It is based on the source-transfer-receiver model and allows setting to correct and precise countermeasures. In early development phases, it also helps to set realistic design targets on full system and component levels.
Renault saves costs by using Simcenter to achieve a more accurate NVH virtual assessment earlier in design.
Industry:Automotive & transportation
Siemens Software:Simcenter 3D Solutions, Simcenter Amesim, Simcenter Testing Solutions