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Viewing data in the time/freqeuncy shows the  product of harmonic energy sources and complex path dynamics. Shown; gear mesh harmoncs interact with the acoustic environment to produce audible noise.

At LEft...

Speech recognizers encode voice by emphasizing the progression of resonance due to the vowel sounds in a word or phrase. Here the phrase "Please Help Me" is portrayed using model based spectra that will eliminate harmonic content and emphasize underlying resonance. Signal.X has employed a similar method to encode non-stationary machine sounds and detect the progression of the sound through a non-stationary pattern.

Our Services...

Signal.X brings many years of diverse NVH Engineering and Test and Measurement experience to our customers. By working with us, you will gain access to hard and valuable lessons learned from hundreds of projects in industries as diverse as semi-conductor manufacturing, rail and highway engineering, aerospace, and all aspects of automotive engineering. Custom application development, mapping to define robust NVH metrics, machine design aid and customized training are some of the most common services we provide. However, our team is also competent in database development, machine control, vision applications, wireless and remote system development, and bus communication protocols. Whether you are facing tough test & measurement issues for the first time, or you wish to augment your existing expertise, you will find that our experienced professionals will quickly establish themselves as a technology partner acting for your competitive advantage.

Ask about our Engineering Expertise in:

  • Powertrain

  • Automotive Accessories

  • Driveline

  • Brakes

  • Vehicle borne test systems

  • NVH Metric development

  • Production NVH testing and machine design


Custom Application Development

The advent of High level programming languages like LabVIEW from National Instruments Corp and powerful low-cost hardware solutions have dramatically altered the economies surrounding the deployment of virtual instruments. If your company needs to implement custom test procedures, reporting or data management tasks, consider working with the expert developers at Signal.X as a way to outfit your team with tools that are custom tailored, inexpensive to duplicate and easy to maintain.


NVH Metric Development

Autonomous product assessment using noise and vibration data requires the development of robust metrics that indicate key factors about machine performance. The process of developing these metrics requires sample field returns, seeded flaws, and rigorous test procedures to establish robust detection and repeatability performance. Signal.X will help you to propose candidate metrics, create a statistically sound test plan, acquire and analyze data, and ultimately deploy proven metrics  suitable to laboratory automation, or production assessment.

 


Machine Design Aid for NVH Signal Quality

Signal.X will join with you in the design of a custom test machine and take responsibility for content that is critical to robust and repeatable dynamic data. Often the design needed to produce quality data well above the rigid body frequencies of a machine will complicate fixturing tooling and instrumentation requirements. Signal.X can help insure data quality and provide diagnostic and corrective action through commissioning.

 


Customized Training in Test & Measurement Tools and Methods

At Signal.X we are actively developing courses designed to introduce technicians and engineers to NVH test & measurement fundamentals consistent with their industry. Engine manufactures, automotive component suppliers, and suppliers to the aerospace industry are among those that have invested in Signal.X tools and training. Our courses are taught from the perspective of active practitioners and use real-world examples and many live demonstrations to convey key concepts.

 

Typical NVH Signal Processing course outline

  • FFT Basics

  • Windows, Leakage and Aliasing

  • Common Analysis Functions (autopower, cross power, transfer function, coherence)

  • Introduction to filters (up-sampling, down-sampling, re-sampling)

  • Rotating machinery basics - techniques in the order domain

  • Multi-Input-Multi-Output (MIMO) signal processing

  • Introduction to Time/Frequency methods