“Previously, Iveco contracted a separate research facility to build analysis models, perform simulations, correlate results, and identify sound-level hotspots,” explained Massimo Martini, who is responsible for vibro-acoustic and NVH (noise, vibration, and harshness) evaluation at Iveco. “Data was exchanged via Ethernet and disks. Lots of emails, telephone calls and visits between sites were needed to discuss briefings, interpret results and resolve issues. Outsourcing the analysis was cumbersome and time-consuming. Difficulties were compounded when we had to convey engineering change requests to analysts and transfer the massive amounts of test data required to validate and refine analysis models.”
Faster and better simulation
To eliminate these bottlenecks, Iveco brought their main acoustic simulation activities in-house with a license for the LMS Virtual.Lab Acoustics software. "By enabling engineers to perform their own analyses, acoustic simulations that used to take up to four weeks are now completed in a week or less. This speed helps engineers perform a greater number of simulations early in development so that fewer prototype test cycles are needed and vehicle development time is reduced," said Martini. "Most importantly, this software provides engineers with greater insight into sound sources, noise paths, and overall vehicle acoustic behavior. This resolves issues faster, better evaluates performance trade-offs, and optimizes designs faster.”
Linking to test lab
Efficiency is also gained in importing real-world test data seamlessly from LMS' Test.Lab system used in the Iveco measurement group. This integration between the LMS test and simulation software helps the engineering and test groups work closely together in an efficient, coordinated manner.
According to Martini, one advantage of LMS Virtual.Lab Acoustics is that it supports both FE and BEM. This gives Iveco the flexibility of using either of these methods depending on the type of sound propagation being studied.
These simulation tools allow Iveco engineers to use a highly disciplined approach to acoustic studies and sound abatement as prescribed by the Centro Richerche Fiat S.C.p.a., the Fiat Group’s major R&D center.
Jennifer Schlegel is senior editor, at LMS International, Leuven, Belgium.
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