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The order is directly proportional to the type of cycle the engine performs under, and in turn, the cylinder configuration. Flowchart of the In-Depth Analysis The leading step to begin the in-depth analysis is to prepare an FEA finite element analysis model of the engine.
After the preparation, the FEA model is then analyzed to check for the accurate frequencies and to eliminate unusual data. Next, the loads that the engine will be operating are predicted and generalized based on the type of simulation. Once the loads are optimized and finalized, the FEA vibration analysis is conducted on the model, which marks the various areas with their respective vibration intensities, and the responses are represented graphically.
Then, the airborne analysis is conducted, and in which, the acoustic analysis is carried out if the review is necessary. The results are compared to the predetermined target. If the results deviate from the target if higher or lower , the entire process has to be repeated and fine-tuned until they coincide. Software for Various Simulations with Specific Outcomes. The new design methods are starting to consider NVH issues throughout the whole design process.
This involves integrating extensive modeling, simulation, evaluation, and optimization techniques into the design process to insure both noise and vibration comfort. New materials and techniques are also being developed so that the damping treatments are lighter , cheaper, and more effective.
The carpeting treatments include varying types of foam padding combined with different weights of rubber-backed carpet. The rubber or asphalt materials are attached to various car panels to add damping and mass loading to reduce vibration levels and the rattling sounds from the panels. Sealant is applied to close gaps in order to increase the transmission loss from the engine, wind, and road noise sources to the vehicle interior.
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The Powertrain excitations have the following frequency ranges: Booming ranges from 20Hz to Hz The mid-frequency level ranges from Hz to 1,Hz The high-frequency level ranges from about Hz to 10,Hz As we reach the high-frequency range, the origin of the noise shifts from being structure-borne to airborne. Defining the Order The order number is defined as the number of vibrating oscillating cycles in one shaft rotation.
This goes to show that the engine is considered as the primary source of noise and vibration, as the crankshaft rotation is the dominant excitation source. Hence, every automobile engine has a specific order number associated with it.
The order number is sub-categorized based on the number of imbalances occurring per cycle of the crankshaft rotation, thereby implying the following format: Nth order vibration occurring once per revolution, where N is a natural number. The order is directly proportional to the type of cycle the engine performs under, and in turn, the cylinder configuration.
Flowchart of the In-Depth Analysis The leading step to begin the in-depth analysis is to prepare an FEA finite element analysis model of the engine. After the preparation, the FEA model is then analyzed to check for the accurate frequencies and to eliminate unusual data.
Next, the loads that the engine will be operating are predicted and generalized based on the type of simulation. Every object that moves or is put into motion can cause potentially critical noise and vibration problems. Altair NVH software, NVH test result of a car types-of-noise-of-car-nvh-noise-wind-noise-road-noise-engine-noise-exhaust-noise-acoustic-wav NVH Noise Vibration and Harshness Tests: The automotive industry is currently spending millions of dollars on NVH work to develop new materials and damping techniques.
The new design methods are starting to consider NVH issues throughout the whole design process. This involves integrating extensive modeling, simulation, evaluation, and optimization techniques into the design process to insure both noise and vibration comfort. New materials and techniques are also being developed so that the damping treatments are lighter , cheaper, and more effective.
The carpeting treatments include varying types of foam padding combined with different weights of rubber-backed carpet.
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