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The measurement of frequency response function (FRF) plays an important role for the dynamic characterization of structures. In most cases, the goal is the measurement-based analysis of a system or the determination of the dynamic properties for validating a simulation model.<\/p>","imageObject":{"variants":[{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/d\/5\/csm_automotive-development_a5e3b715ca.jpg.webp","type":"image\/webp","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/d\/5\/csm_automotive-development_a5e3b715ca.jpg","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/d\/5\/csm_automotive-development_c693b41517.jpg.webp","type":"image\/webp","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/d\/5\/csm_automotive-development_c693b41517.jpg","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/automotive-development.jpg.webp","type":"image\/webp","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/automotive-development.jpg","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/d\/5\/csm_automotive-development_bc5b77bd60.jpg.webp","type":"image\/webp","name":"extrasmall","width":"640","breakpoint":"320"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/d\/5\/csm_automotive-development_bc5b77bd60.jpg","name":"extrasmall","width":"640","breakpoint":"320"}],"default":{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/d\/5\/csm_automotive-development_a5e3b715ca.jpg","alt":"Automotive development","title":""}},"link":"https:\/\/magazine.polytec.com\/fr\/frequency-response-function-measurement-using-qtec-multi-path-interferometry","origUid":6915,"readingTime":"7 min","subline":"New vibrometer technology in practical testing","tags":[{"title":"Automotive & aerospace","uid":3}],"technologies":[{"title":"Vibrometry","uid":214}],"title":"Frequency response function measurement using QTec® multi-path interferometry","uid":6940,"visits":61},{"authors":[],"datetime":null,"description":"

Noise protection and control play a major role in both professional and private environments. Airborne sound measurements help identify acoustic paths as a means of noise reduction as standard testing method. The underlying sound generation is typically achieved by using omnidirectional sound sources ...<\/p>","imageObject":{"variants":[{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/5\/5\/csm_robovib-ntek_1945e40970.jpg.webp","type":"image\/webp","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/5\/5\/csm_robovib-ntek_1945e40970.jpg","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/5\/5\/csm_robovib-ntek_384f5ee757.jpg.webp","type":"image\/webp","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/5\/5\/csm_robovib-ntek_384f5ee757.jpg","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/robovib-ntek.jpg.webp","type":"image\/webp","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/robovib-ntek.jpg","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/5\/5\/csm_robovib-ntek_883f2537f7.jpg.webp","type":"image\/webp","name":"extrasmall","width":"640","breakpoint":"320"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/5\/5\/csm_robovib-ntek_883f2537f7.jpg","name":"extrasmall","width":"640","breakpoint":"320"}],"default":{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/5\/5\/csm_robovib-ntek_1945e40970.jpg","alt":"","title":""}},"link":"https:\/\/magazine.polytec.com\/fr\/analyzing-operational-deflection-shapes-on-loudspeakers","origUid":6845,"readingTime":"4 min","subline":"Loudspeakers for noise protection","tags":[{"title":"Automotive & aerospace","uid":3},{"title":"Acoustics & ultrasonics","uid":2},{"title":"Civil & structural engineering","uid":7},{"title":"Materials research & NDT","uid":9}],"technologies":[{"title":"Vibrometry","uid":214}],"title":"Analyzing operational deflection shapes on loudspeakers","uid":6851,"visits":91},{"authors":[],"datetime":null,"description":"

The growth of the drone market is multi-faceted: growing concerns about national and border security drive the need for advanced aerial surveillance, package delivery services experience an increased demand for drone operations accelerated by the pandemic, hazardous environments in mining and construction open the eyes ...<\/p>","imageObject":{"variants":[{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_a0cd689c9f.jpg.webp","type":"image\/webp","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_a0cd689c9f.jpg","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_45467c4e31.jpg.webp","type":"image\/webp","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_45467c4e31.jpg","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_8c6313880b.jpg.webp","type":"image\/webp","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_8c6313880b.jpg","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_fdefca8a1b.jpg.webp","type":"image\/webp","name":"extrasmall","width":"640","breakpoint":"320"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_fdefca8a1b.jpg","name":"extrasmall","width":"640","breakpoint":"320"}],"default":{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/e\/csm_quiet-drones_a0cd689c9f.jpg","alt":"Flying drone","title":""}},"link":"https:\/\/magazine.polytec.com\/fr\/noise-and-modal-analysis-for-quiet-and-reliable-operation","origUid":6651,"readingTime":"6 min","subline":"Quiet drones","tags":[{"title":"General R&D","uid":6},{"title":"Automotive & aerospace","uid":3}],"technologies":[{"title":"Vibrometry","uid":214}],"title":"Noise and modal analysis for quiet and reliable operation","uid":6721,"visits":109},{"authors":[],"datetime":null,"description":"

Fuel consumption of aircrafts is a hot topic in the current discussion about global climate change. An important factor is the design of the aircraft engine itself. In order to reduce weight and build more economic engines, the use of blade integrated disks (blisks) is getting more widespread.<\/p>","imageObject":{"variants":[{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/5\/csm_blisk-fem_1c8d5aab50.jpg.webp","type":"image\/webp","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/5\/csm_blisk-fem_1c8d5aab50.jpg","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/blisk-fem.jpg.webp","type":"image\/webp","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/blisk-fem.jpg","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/blisk-fem.jpg.webp","type":"image\/webp","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/blisk-fem.jpg","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/5\/csm_blisk-fem_06f784cc17.jpg.webp","type":"image\/webp","name":"extrasmall","width":"640","breakpoint":"320"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/5\/csm_blisk-fem_06f784cc17.jpg","name":"extrasmall","width":"640","breakpoint":"320"}],"default":{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/4\/5\/csm_blisk-fem_1c8d5aab50.jpg","alt":"blisk fem ","title":""}},"link":"https:\/\/magazine.polytec.com\/fr\/3d-scanning-laser-doppler-vibrometry-for-fuel-efficient-turbines","origUid":6404,"readingTime":"6 min","subline":"FE model correlation of a blisk","tags":[{"title":"Automotive & aerospace","uid":3}],"technologies":[{"title":"Vibrometry","uid":214}],"title":"3D scanning laser Doppler vibrometry for fuel-efficient turbines","uid":6540,"visits":129},{"authors":[],"datetime":null,"description":"

Dynamic 3D operational deflection shapes captured with an Xtra Scanning Vibrometer help reveal the source of rolling tire noise. For a wide range of driving conditions, rolling tires stimulate a significant amount of passenger car noise (NVH) inside and outside of the passenger cabin.<\/p>","imageObject":{"variants":[{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/e\/c\/csm_car-tires_3ec409b062.jpg.webp","type":"image\/webp","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/e\/c\/csm_car-tires_3ec409b062.jpg","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/car-tires.jpg.webp","type":"image\/webp","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/car-tires.jpg","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/e\/c\/csm_car-tires_6bc77b66d0.jpg.webp","type":"image\/webp","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/e\/c\/csm_car-tires_6bc77b66d0.jpg","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/e\/c\/csm_car-tires_aa6d44b63a.jpg.webp","type":"image\/webp","name":"extrasmall","width":"640","breakpoint":"320"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/e\/c\/csm_car-tires_aa6d44b63a.jpg","name":"extrasmall","width":"640","breakpoint":"320"}],"default":{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/e\/c\/csm_car-tires_3ec409b062.jpg","alt":"","title":""}},"link":"https:\/\/magazine.polytec.com\/fr\/xtra-3d-scanning-vibrometry-on-rolling-tires","origUid":6391,"readingTime":"5 min","subline":"Keep on rolling","tags":[{"title":"Automotive & aerospace","uid":3}],"technologies":[{"title":"Vibrometry","uid":214}],"title":"Xtra 3D scanning vibrometry on rolling tires","uid":6537,"visits":120},{"authors":[],"datetime":null,"description":"

The validation of simulation models is an important application area of laser vibrometers. To do this, the geometric data from a finite element mesh is loaded into the software of the measurement system and brought into alignment with the real object using an integrated alignment process.<\/p>","imageObject":{"variants":[{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/3\/e\/csm_brake-disc_488b93d4a3.jpg.webp","type":"image\/webp","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/3\/e\/csm_brake-disc_488b93d4a3.jpg","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/brake-disc.jpg.webp","type":"image\/webp","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/brake-disc.jpg","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/brake-disc.jpg.webp","type":"image\/webp","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/brake-disc.jpg","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/3\/e\/csm_brake-disc_0ab10ac9a2.jpg.webp","type":"image\/webp","name":"extrasmall","width":"640","breakpoint":"320"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/3\/e\/csm_brake-disc_0ab10ac9a2.jpg","name":"extrasmall","width":"640","breakpoint":"320"}],"default":{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/3\/e\/csm_brake-disc_488b93d4a3.jpg","alt":"","title":""}},"link":"https:\/\/magazine.polytec.com\/fr\/experimental-modal-test-with-laser-vibrometers","origUid":6323,"readingTime":"4 min","subline":"Brake discs on the test station","tags":[{"title":"Automotive & aerospace","uid":3}],"technologies":[{"title":"Vibrometry","uid":214}],"title":"Experimental modal test with laser vibrometers","uid":6532,"visits":144},{"authors":[],"datetime":null,"description":"

The SADE project studied “smart” morphing mechanical elements of next generation wings, which was aimed at improving aerodynamic performance, fuel efficiency, as well as reducing noise and emissions in all stages of flight, especially landing.<\/p>","imageObject":{"variants":[{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/8\/4\/csm_above-the-clouds_3a798d8022.jpg.webp","type":"image\/webp","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/8\/4\/csm_above-the-clouds_3a798d8022.jpg","name":"default","width":"570","breakpoint":"1200"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/above-the-clouds.jpg.webp","type":"image\/webp","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/above-the-clouds.jpg","name":"large","width":"900","breakpoint":"992"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/above-the-clouds.jpg.webp","type":"image\/webp","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/magazine\/vibrometry\/image\/above-the-clouds.jpg","name":"medium","width":"1380","breakpoint":"768"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/8\/4\/csm_above-the-clouds_29ced31496.jpg.webp","type":"image\/webp","name":"extrasmall","width":"640","breakpoint":"320"},{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/8\/4\/csm_above-the-clouds_29ced31496.jpg","name":"extrasmall","width":"640","breakpoint":"320"}],"default":{"src":"https:\/\/magazine.polytec.com\/fileadmin\/_processed_\/8\/4\/csm_above-the-clouds_3a798d8022.jpg","alt":"","title":""}},"link":"https:\/\/magazine.polytec.com\/fr\/determining-the-dynamic-characteristics-of-an-aircrafts-large-scale-adaptive-compliant-wing-slat-section-prototype","origUid":6319,"readingTime":"3 min","subline":"Above the clouds","tags":[{"title":"Automotive & aerospace","uid":3}],"technologies":[{"title":"Vibrometry","uid":214}],"title":"Determining the dynamic characteristics of an aircraft’s large-scale, adaptive compliant wing slat section prototype","uid":6530,"visits":135},{"authors":[],"datetime":null,"description":"

The following article compares various forms of force excitation in order to determine the transfer admittances of mechanical systems using a gear wheel as an example. The objective is to analyze and assess the acoustic properties of technical structures, e.g. the drive train of an electric vehicle, in the higher frequency 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