Improved Methods for Root Cause Analysis of NVH Problems: LMS Test.Lab Rev 12 Delivers Accurate and Fast Transfer Path Analysis Solutions

February 19, 2013 - LMS International has released Rev 12 of LMS Test.Lab, its integrated testing solution for noise-vibration-harshness (NVH) engineering. Rev 12 introduces a wealth of new features and enhanced solutions. In particular, it substantially improves the results accuracy of Transfer Path Analysis (TPA), one of the key analysis methods in LMS Test.Lab.

Test.Lab Rev 12

TPA is a well-known technique that is commonly used to solve vibro-acoustic issues. As a systematic method to detect root causes of NVH problems, TPA is widely adopted across many industries. LMS has developed technology innovations that drastically speed up TPA processes. Improvements in LMS Test.Lab Rev 12 ensure that fast TPA results maintain or exceed the accuracy level of classical TPA methods, while providing engineering insight early in the development process.

“TPA plays a crucial role in the NVH optimization process through its ability to evaluate the contribution along each transfer path from the true source of noise and vibration to the receiver,” said Bruno Massa, Vice President, Test Operations at LMS International. “This makes it possible to identify the components along that path that need to be modified to solve a specific problem. One of our main objectives with LMS Test.Lab Rev 12 was to eliminate possible pitfalls in several advanced TPA techniques in order to ensure reliable results.”

Several types of acquired data can be used in TPA analysis including vibration and acoustic signals as well as strain data. Strain data is valuable because it generally helps clearly identify local forces. However, very low strain values can potentially impair calculations when solving the TPA matrix, yielding noisy results. With Rev 12, the mixed strain, vibration and acoustics signals are automatically balanced in the equations for guaranteed correct matrix inversion results.

Rev 12 also offers a significant enhancement of LMS OPAX, a TPA method for load identification that substantially reduces the measurement time needed to build the full data model. Rev 12 makes it possible to constrain intermediate results to ensure their validity so that only physically relevant results are retained in every step of the process. Purely mathematical solutions (for example a negative mass) are thus rejected. All results, whether intermediate or final, are valid and can be used reliably, for example as input to simulation models.

About the LMS TPA solution

A pioneer of transfer path analysis, LMS commercialized the first TPA product in the early 1990s under the LMS CADA-X platform. Today, this know-how is baked into the market-leading LMS Test.Lab and LMS Virtual.Lab solutions. Various LMS Test.Lab modules include a wide range of dedicated TPA features including LMS Test.Lab Single Reference Transfer Path Analysis and LMS Test.Lab Airborne Source Quantification (ASQ); LMS Test.Lab Multi-reference Transfer Path Analysis; LMS Test.Lab OPAX and LMS Test.Lab Time Domain TPA. More information about these modules and the latest version of LMS Test.Lab Rev 12 is available online: and

About LMS, A Siemens Business, The Leading Partner in Test and Mechatronic Simulation

LMS is a leading provider of test and mechatronic simulation software and engineering services in the automotive, aerospace and other advanced manufacturing industries.

As a business segment within Siemens PLM, LMS provides a unique portfolio of products and services for manufacturing companies to manage the complexities of tomorrow’s product development by incorporating model-based mechatronic simulation and advanced testing in the product development process. LMS tunes into mission-critical engineering attributes, ranging from system dynamics, structural integrity and sound quality to durability, safety and power consumption.

With multi-domain and mechatronic simulation solutions, LMS addresses the complex engineering challenges associated with intelligent system design and model-based systems engineering. Thanks to its technology and over 1250 dedicated people, LMS has become the partner of choice of more than 5,000 manufacturing companies worldwide. LMS operates in over 30 key locations around the world.

Based in Leuven, Belgium, LMS has 30 years of solid engineering experience with an unrivaled track record in developing and marketing technology breakthroughs that address very real customer challenges. From its roots as a high-tech spin-off from the University of Leuven in Belgium, LMS has grown to become a worldwide leader in engineering innovation with mechatronic simulation software, testing systems and engineering services.


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