Identifying dominant noise and vibration transmission paths
Transfer Path Analysis (TPA) is a technique, well established both experimentally and analytically, to estimate and rank contributions to noise and structural vibration levels through individual structural transmission paths.
TPA is particularly valuable when the structural system is complex and many structural modes contribute to the frequency response. In computer based analytical, or virtual, TPA the structure is represented by an assembly of its finite element components. Responses are determined using the forces at the interface between components and the transfer functions relating the interface forces and responses.
Therefore, TPA may be used to reduce the response to the component level and identify the dominant noise and vibration transmission paths. In the automotive industry, virtual TPA may be used to optimize body structure and mount stiffness to ensure satisfactory noise and vibration performance at the CAE stage of the vehicle development process.
CDH/TPA software is designed as a tool to be used in a Nastran-based CAE process. Forces and transfer function data is imported in Nastran punch format. It may be used in a graphic user interface (GUI) mode or in a batch mode that is suitable for handling multiple TPA analyses with many load cases.
Implementation
Graphical user interfaces (GUI)
- One simple GUI with all important information, plot configurations and selection menus are accessible in the main application window.
- Easy switch between mount groups.
- Easy selection of mounts for filtering.
- One-action button for every plot type.
POST-PROCESSING
Also available for selected forces, transfer functions and LDS.
Also available for selected forces and transfer functions.
The path contributions can be integrated over a specified frequency band to estimate the overall contribution of the mounts. Two types of integral are available, path magnitude and projected contribution.
Combined color-map views for the transfer path contributions, section forces and transfer functions for user-defined frequency range.
Shows the transfer path contributions curve (top), the bar plot (bottom-left) and the polar plot (bottom-right) for selected mounts at a frequency conveniently specified with slider. Rank path contribution and filter the rank by the mount hierarchy and degrees of freedom of paths.
Total transfer path contributions (top-left) and a bar plot for selected path contributions at a specific frequency (top-right) are shown. The frequency can be quickly changed by a slider. The lower bar plots shows the resulting forces and transfer functions, where the subdivisions of the bars provide the information of the x, y, z components.
This plot shows the most dominant paths or groups of paths and the in-phase or out-of-phase participations over the complete frequency range.
Having set a response target, the path contributions are integrated over the target-violated frequency range and ranked.
Advantages
- It makes it very easy to perform TPA analysis. It is suitable for both the experienced and novice NVH engineer. The user needs no in-depth theoretical knowledge and no postprocessor knowledge.
- Interactive investigation of NVH responses in a complex model.
- All plotting options for viewing the analysis results of the TPA can be updated with the selection of paths or DOFs and the switch between different views is simple and fast.
- The easy use of selection boxes in combination with user defined path groups makes it simple and fast to identify and filter dominant paths and their relevant information.
- CDH/TPA is presentation-friendly. Once the analysis is completed, the results for the specific load case, frequency and response can be visualized and output for presentation purposes with a few mouse clicks.
- Once the configuration file has been created, CDH/TPA can be used in batch mode to carry out multiple TPAs and create a TPA database.
- Using the modeling standards established within your organization, even the creation of the configuration file (and input files) can be automated, providing maximum possible automation in the CAE process.
System Requirements
OPERATING SYSTEM
Red Hat / SUSE Linux64 (x86_64)
Microsoft Windows 64bit
TRIAL INSTALLATION
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