IN-VEHICLE POWERTRAIN NOISE EVALUATION. DISCOM Mobile

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1 IN-VEHICLE POWERTRAIN NOISE EVALUATION DISCOM Mobile

2 IN-VEHICLE TESTING Customized to fit individual production lines, DISCOM NVH Analysis systems are used by the automotive industry around the world for acoustical quality analysis. DISCOM Mobile, especially designed for in-vehicle testing, is a key element for ensuring optimal testing and getting the most out of your production line. DISCOM NVH Analysis systems Iterative process performs in-vehicle testing to synchronous resampling to are used to test automotive Using DISCOM Mobile means evaluate overall vehicle noise separate the noise sources powertrain components at that you can correlate vehicle inside the cabin and identify from each other and from other the end of their production behaviour and generate masking effects or noise caused external sources. lines. After end-of-line testing, test-stand limits. All testing is by unforeseen transfer paths. In the vehicle, certain speeds and DISCOM Mobile uses the performed at end-of-line test The data and drive feedback are torques are more susceptible to same software data structure benches under driving conditions used to refine the test limits. This gear, transmission, axle or engine and mobile versions of the based on a combination of is an iterative process that leads noise than others. These speed same hardware as used in the learned and fixed parameter to a more refined set of limits for bands and torque conditions are test stands, so you can easily limits. Once a preliminary the next trip through the end-of- of primary interest to the end- correlate data and analyses to baseline is established, you can line test stand. of-line tester. In order to gain ensure the most accurate test- put the completed powertrain the most benefit from your test stand limit parameters. components in vehicles for Separating noise sources system, it is essential to find the testing using the mobile Like the test-stand systems, speeds and the torques that are test system. DISCOM Mobile DISCOM Mobile uses order- most critical in the car. SYSTEM COMPOSITION CAN-bus adapter ICP ¼ microphones TAS Nano with four channels ICP accelerometer Optional: TAS28 Front End that can expand the system to eight channels

3 Robust system Analysis methods DISCOM Mobile offers the Benefits of DISCOM Mobile DISCOM Mobile consists of Vehicle measurements are following analysis methods: Acoustic quality analysis as an integral a data acquisition front end stored as wave files and in Order analysis with four part of the manufacturing process connected to a laptop or tablet DISCOM archive format, which microphones the order enables rapid, reliable and thorough computer. The unique USB-based is compatible with the test-stand spectra of the microphones testing of all kinds of mechanical data acquisition front end offers evaluation software. The order are averaged to compensate assemblies. You can adapt DISCOM four to eight sensor channels, and fixed frequency spectra for cabin resonances due to NVH Analysis systems to nearly any depending on the configuration. are displayed in real-time, so standing waves application. For testing automobile A special software setup you can monitor the current Order analysis of the gearbox components and evaluating vehicles means that you can measure status of a noise source during vibration signal with an overall noise emissions inside the cabin, the averaged power spectrum measurement. accelerometer attached to the DISCOM Mobile is the ideal solution. of four microphones and one Spectrograms of the cabin gearbox accelerometer. sound field and of the Spectrograms of both Use DISCOM Mobile for in-vehicle The system includes: powertrain component vibration sound and vibration orders, acoustical quality analysis: Laptop or tablet PC running can be used to evaluate critical recorded over speed order Optimize test stand-to-vehicle Microsoft Windows speed bands for all orders of spectrograms can be recorded correlation TAS Nano with four channels interest. for the gearbox vibration Ensure testing of most critical or TAS28 with up to eight Order cuts show mesh energy signal and for the cabin speeds and torques channels over speed. These order cuts can sound field and, from these, Compensate for cabin resonances CAN bus adapter for then be compared with test- order tracks for arbitrary Simultaneously analyse gearbox acquiring engine speed and stand data. With this analysis, orders and order spectra vibration data and transmission data other control data speed ranges of high vehicle for arbitrary speeds can be Store all data for each test and Four ICP ¼ microphones susceptibility can be identified generated quickly retrieve it for later reference One ICP accelerometer and the test-stand limits set Order tracks and online order Directly compare vehicle accordingly. spectra in vehicles or under measurements and test stand portable conditions measurements Identify root causes of faults

4 DISCOM NVH ANALYSIS SYSTEMS Fast and accurate: A/D inputs with up to 100 khz sampling rate per channel and 24-bit resolution AC, DC and ICP inputs, configurable for each channel Four speed inputs with up to a 10 MHz pulse rate (in TAS28 configuration) Sample-wise alignment of CAN data and A/D data Power saving: The system can operate with 6 channels using only the 2.5 W USB power supply No fan required the system is completely quiet for in-vehicle noise measurements Lightweight and truly mobile everything fits into a city backpack

5 CABIN NOISE COMPONENTS Noise sources Engine and attached units Head wind Air cooling intake Transmission Exhaust system Exhaust pipe Tyres and road Tyres and road Transfer paths Airborne noise source Vibration transfer path Car body vibration Car body noise emission Airborne noise transfer path

6 DISCOM For the past 20 years, DISCOM has developed and distributed systems for acoustical quality analysis used in end-of-line testing, and these systems are highly respected and used worldwide by companies in and around the automotive industry. Brüel & Kjær acquired DISCOM on July 26, This acquisition enables Brüel & Kjær to better support its customers by expanding its production quality testing capabilities to end-of-line analysis solutions. Brüel & Kjær also provides networks for DISCOM to better support customers and additional resources to facilitate adaptation to the ever-evolving automotive industry. Brüel & Kjær Sound & Vibration Measurement A/S DK-2850 Nærum Denmark Telephone: Fax: Local representatives and service organizations worldwide Brüel & Kjær DISCOM Neustadt Göttingen Germany Telephone: BG ËBG ^Î 06/2017

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