Polytec-激光测振仪在模态分析领域的最新应用--课件

1、Polytec China Polytec 激光测振仪在振动和应变领域的最新应用 Polytec 公司介绍Polytec 新产品的介绍Polytec 在振动和应力应变领域最新的应用案例4. 测试产品应用发展趋势1. Polytec 公司介绍History:Foundation in 1967 Polytec = first company selling LASER in Germany and EuropeAbout 30 years ago first Laser Doppler Vibrometer (LDV)During last 30 years continuous improve

2、ment of LDV now 3D SLDV with RobotToday:Market leader in field of non contact vibration measurements320 employees strong development team (65 employees) Development + manufacturing all in Waldbronn offices and sales in whole worldHeNe Laser3D Scanning LDV2014年陈志坚博士因照顾家庭，计划返回加拿大。Polytec China 2014年5月

3、正式成立太平洋光电的代理业务将转给Polytec China 1. Polytec 公司介绍2. Polytec 新产品介绍Single point to scanning1D to 3Dnmpm, fm1Hz 10kHz0Hz 1,2 GHzresolutionbandwidthUp to 10mUp to 500mdistance2. Polytec 新产品介绍Polytec “always state of the art” our new productsPSV-500-3D in combination with KUKA robotThe new patented MSA-100-

4、3DThe new UHF-120The new RSV-150 with infrared LASER sourceMSA-100-3D for 3D vibration analysis2. Polytec 新产品介绍UHF-1202. Polytec 新产品介绍光学头采用顶尖的光学技术，激光点直径小于1m（安装100倍物镜），是微型物体和具有短声波特点的超高频物体的振动测量的最佳选择。Polytec的Vibsoft软件具有强大的分析及后处理功能，可显示频谱信号、速度或位移的瞬态时域信号，最高频率可达1200MHz。9RSV-150 Short Range (0,8 4,5m) and L

5、ong Range (5m 500m) Version available new infrared laser (1550 nm Erbium fiber laser) new laser with lots of advantages 20 better optical sensitivity (10mW output power + 2 x more photons)Stabilized laser DC displacement measurements without drift possible Extreme long coherence length (measurements

6、 up to 1000m tested) B (1 m/s and 25kHz) and M (24,5 m/s and 2 MHz) Version eye save water in eye absorbs 1550nm class 2 for both laser 2. Polytec 新产品介绍3. Polytec 在模态分析行业最新的应用案例Version 06/10101）极端温度航空航天GVT测试 （多点热模态）a) OFV-5000 + OFV-505/ OFV-534 / OFV-552 Sensor HeadControllerKey FeaturesModular App

7、roachApplication specific configurationBest resolution Upgradeable to Scanning VibrometerFrequencies up to few MHzDifferent decoder cards Vibrometer Systemb) 极端温度测试问题和需要For Aerospace, we need structure test in very high and low temperature now.Use tranditional method, it is very diffictult to do mod

8、al survey test in extreme conditon. c) Polytec 解决方案和具体案例Version 06/1012Requirement in aerospace : 1) Hot or cold temperature modal test2) Long distance, non-contact3) Simultaneous measurement （16, 17 muti-points)2) PSV-500-3D 与 Kuka机器人结合完成模态测试及试验和有限元（FEM) 的相关性分析 Version 06/10133. Polytec 在模态分析行业最新的应

9、用案例Setup in Test Field Mercedes Benz StuttgartSet-up with 1 shaker and accelerometers for hidden pointscabling for hidden points20.07.202214FEM Validation of carSetup in Test Field Mercedes Benz Stuttgart20.07.202215FEM Validation of carSetup in Test Field Mercedes Benz Stuttgart20.07.202216FEM Vali

10、dation of carWorking Distance 2mPossible sections with 2m distance to the vehicle: 5 measurements needed for one side of the car20.07.202217Experimental Modal AnalysisMode Shapesstitched from segments, same excitationincreasing frequency20.07.202218Experimental Modal Analysis19 Version 2013Validatio

11、n of FE ModalSummary How to validate FE simulationFE SimulationExp. Modal AnalysisMode ShapeMode Shape adapting curve fitting to checkCorrect modal parametervalidationGrid importScanExport3) PSV-500 40m 长风力发电机叶片测试Large structure20FEM validation also of big parts possible with PSV4) 航空发动机模态与应力应变同步测试B

12、LISK (blade integrated disk) from Rolls Royce MTOC + TU Cottbus to reduce “fuel” consumption by means of reducing weight of turbineProblem:Mistuning due to inaccuracy of manufacturing process = blade have different resonances + low damping (just material damping) high vibration amplitudes (up to 2x

13、compared to ideal design) huge strain huge stress shorter livetimeVersion 2013What is strain?longitudinal strain:dLLsxPSV-500-3D Stress an Strain - dynamicAdvantages compared to strain gauge: No mass loadingHigh spatial resolution (point distance below 1mm)Full field stress & strain distributionHigh

14、 resolutionPSV-3D Strain: Results20.07.2022# 247000 nm 350 nmD = 35 nm (Grid: 3 mm)D = 6 nm (Grid: 2 mm)e xxe yy3Din-plane2 Stress & Strain calculation by strain processorStrain Measurements FEM7/20/202225Stress ZXStress ZStress XFatigue testing of bladesHigh Amplitudes excitedWith e.g. HSV-100 or O

15、FV-5000 we measure vibration of turbine bladeBefore blade brakes the amplitude and resonance frequencies are changingAlso performed in climatic chamberVersion 06/1027Optimization mistuning (different resonances for different modes) 5) Squealing brakes - automotiveVersion 06/1028Problem: squealing br

16、akesAim: get rid of brake squealingHow?Measure Vibrations during squealing in Dynamometer visualize vibration validate existing FE model improve design of brake system test again Porsche Brake SystemsHow do other customer use the LDV ? 1. AutomotiveVersion 06/1029Theory avoid “mode coupling” (energy

17、 from in plane mode coupled to oop mode which makes noise) Separate modes! How do other customer use the LDV ? 1. AutomotiveVersion 06/1030More and more electronic parts in cars e.g. air bag sensorProblem: vibration in car can damage electronics e.g. condenser falls apart from boardAim: Shaker tests

18、 + SLDV vibration measurements to understand: Why does chip or condenser falls apart from boardHow do other customer use the LDV ? 1. Automotive20.07.2022# 31219 m span1900 t stealWhy is it useful to measure the dynamic properties of a bridge?The behaviour of Eigenfrequencies over time can be used t

19、o determine the aging of the bridge Knowing the initial state is key Factors like Temperature and load also influence the dynamic properties 6) Bridge measurement Grevenmacher20.07.2022# 32DraufsichtScan RSV“ Reference RSVSet upBridge measurement Grevenmacher20.07.2022# 33Reference RSVScan RSV“ Set upBridge measurement Grevenmacher20.07.2022