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Single Reference Transfer Path Analysis and Airborne Structure

 
LMS Test.Lab Single Reference Transfer Path Analysis helps engineers trace the flow of vibro-acoustic energy from a source, through a set of known airborne and structure-borne pathways, to a given receiver location. The solution supports contribution analysis for single source noise or vibration issues, during stationary or run-up and run-down operating conditions. Airborne and structure-borne paths can be analyzed together or separately, using frequency response functions and operational data.
 

Single Reference Transfer Path Analysis and Airborne Source Quantification LR 01.jpgLMS Test.Lab Single Reference Transfer Path Analysis helps engineers trace the flow of vibro-acoustic energy from a source, through a set of known airborne and structure-borne pathways, to a given receiver location. The solution supports contribution analysis for single source noise or vibration issues, during stationary or run-up and run-down operating conditions. Airborne and structure-borne paths can be analyzed together or separately, using frequency response functions and operational data.

The LMS Test.Lab Single Reference Transfer Path Analysis solution includes LMS Test.Lab’s very convenient workflow. At each stage of the process, clear user-feedback is given. The source-transfer-receiver model is deployed in a very flexible way, with different data sets that can be easily compared against each other for the different operating cases under investigation. Operational forces can be accurately defined using the complex stiffness and matrix inversion methods. 

The complex stiffness method is used to identify transfer paths in cases where the source side is connected to the receiver via mounts. The operational forces can be determined from knowledge of the complex dynamic mount stiffness and the differential displacement over the mount during operation. The matrix inversion method is used to identify operational loads when the stiffness curve is unknown or for rigid connections. The technique is based on inversion of a measured accelerance matrix between structural responses on the receiver side due to force excitation.

LMS Test.Lab Airborne Source Quantification (ASQ) quantifies acoustic source strengths and their airborne transmission paths under stationary or run-up and run-down operating conditions. The method helps quantify operational acoustical loads from single point sources, multi-point sources, or even multiple partially correlated acoustical sources. Multiple techniques are supported: point-to-point surface sampling, sound intensity measurements and matrix inversion. The solution supports also the quantification of vibration loads, separately or at the same time. Acoustical Transfer Functions are measured using volume velocity source excitation techniques.

Throughout the entire application, display layouts will automatically switch to layouts specific for the data evaluation at hand. The solution helps engineers easily manage vast amounts of analysis data.



Features

  • Convenient data management
  • Assisted selection of FRF and operational data
  • Workflow-oriented solution with user guidance
  • Context sensitive display layouts and contribution analysis (4D displays)
  • Convenient comparison of multiple data sets


Benefits

  • Systematic approach to vibro-acoustic refinement
  • Common solution for structural and acoustic source quantification
  • Ease-of-use for optimal productivity
  • Supports multiple vibration or acoustical load quantification techniques
  • 20-year experience of enhanced engineering insights



    Covering a range of industries, LMS application cases let you discover how LMS solutions help our customers solve their real-life engineering challenges.

    Engineers at International Automotive Components use the new LMS Test.Lab High Definition Acoustic Camera to identify noise sources in seconds

    International Automotive Center IAC.jpgEngineers at International Automotive Components (IAC) – the largest acoustic materials supplier to the automotive industry – use the new LMS Test.Lab High Definition Acoustic Camera to identify noise sources in seconds compared to hours and days needed with traditional methods. Using this tool, engineers gain deeper insight into acoustic behavior and shorten turnaround times in lowering interior car noise for automakers around the world.




    Silencing the dishwasher in a drawer

    Fisher and Paykel_ES_Test.jpgThe old adage that children should be seen and not heard applies equally well to today’s generation of home appliances in which quietness is a ’must-have’ quality. With competitive pressures bearing down and a time crunch in developing a whole series of low-noise dishwashers, New Zealand’s Fisher & Paykel teamed up with LMS Engineering Services in some fast-turnaround detective work that quickly lowered radiated noise in time to meet tight product launch schedules.


     
    John Deere Engineers lower noise emission levels at their equipment with LMS

    ind_ground1.jpg
    Construction equipment is designed primarily to fulfill operational requirements, although operator comfort and noise concerns are important design considerations. Quietness is becoming a critical product attribute in construction equipment, and manufacturers that cannot measure up will have a tough time competing in the international market. Traditionally, companies try to reduce noise emissions with sound-damping add-ons and structural modifications when noise problems crop up during prototype testing near the end of product development. But these last-ditch efforts involve lots of guesswork and are costly and time-consuming, and often create more problems than they solve.


    >>LMS Engineering - Vehicle Interior Noise Reduced by 6 dB in 5 Weeks
    >>Quantification of Intake System Noise at Nissan Motor Co.




    Brochures
    Download the LMS Test.Lab Transfer Path Analysis Brochure 

    Images

    Single Reference Transfer Path Analysis and Airborne Source Quantification LR 02.jpg Single Reference Transfer Path Analysis and Airborne Source Quantification LR 03.jpg Single Reference Transfer Path Analysis and Airborne Source Quantification LR 04.jpg
    Engine TPA identifies structural contribution of the engine model. LMS Test.Lab TPA includes an advanced 4D display that helps analyze results from every angle. The analysis yield efficient and structured TPA model definition




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