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CARE05 – November 2005 1 Status report on active stabilisation of a linear collider final focus quadrupole mock-up J. Lottin, ESIA

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Presentation on theme: "CARE05 – November 2005 1 Status report on active stabilisation of a linear collider final focus quadrupole mock-up J. Lottin, ESIA"— Presentation transcript:

1 CARE05 – November 2005 1 Status report on active stabilisation of a linear collider final focus quadrupole mock-up J. Lottin, ESIA Jacques.lottin@univ-savoie.fr

2 CARE05 – November 2005 2 LAViSta L aboratories in A nnecy working on Vi bration Sta bilisation Catherine ADLOFF (20%) Benoît BOLZON (100%) Nicolas GEFFROY (100%) Andréa JEREMIE (80%) Yannis KARYOTAKIS (40%) Laurent BRUNETTI (100%) Fabien FORMOSA (10%) Jacques LOTTIN (20%) Laurent GIACOBONE Claude GIRARD Fabrice PELTIER Yan BASTIAN Franck CADOUX

3 CARE05 – November 2005 3 Final focus system vibrations Excitation spectrum Structural resonances Ground motion Cooling system Air flows Power supply system… ( Amplified motions)

4 CARE05 – November 2005 4 2.Modelling & Simulation - Tools - Tests - Comparison 3.Feedback loop - Reduced size Mock up - Algorithm - Results 4.Future prospects - New Mock up design - Simulation of the whole system 1.Measurements - Sensor characteristics - Ground motion - Acquisition tools Outlines

5 CARE05 – November 2005 5 Measurements  Seismic sensors : Measurement of the ground velocity  Accelerometers : Measurement of the ground acceleration 2 types of sensors : Non magnetic

6 CARE05 – November 2005 6 0.2Hz 7Hz 100Hz Good coherence between velocity sensors Good coherence between accelerometers Measurements

7 CARE05 – November 2005 7  Bruel and Kjaer electronics ADC also designed for spectral analysis, especially for modal analysis Pulse software for data acquisition (from the company) VE13, Guralp, SP400, GSV320, ENDEVCO sensors Less electronic noise and better resolution  Better results with accelerometers at low frequencies (same results with velocity sensors which have a bigger amplitude)  This system has been used to show the current results  Home made DAQ based on PXI-4472B ADC from NI ADC designed for spectral analysis : includes anti-aliasing… Labview software for data acquisition (our development) VE13, Guralp, SP400, GSV320, ENDEVCO sensors Measurements

8 CARE05 – November 2005 8 Resolution 4Hz 0.2nm 0.6nm Measurements

9 CARE05 – November 2005 9 Identify eigenfrequencies Display mode shapes Modal tests on the free-fixed beam - SAMCEF - Modelling & Simulation Mode 3: 101 Hz Mode 1: 16 Hz

10 CARE05 – November 2005 10 Modelling & Simulation Experimental set-up

11 CARE05 – November 2005 11 PULSE FFT Analysis f1 = 16 Hz f2 = 72 Hz f3 = 97 Hz f4 = 269 Hz f5 = 281 Hz Modelling & Simulation

12 CARE05 – November 2005 12 Modelling & Simulation

13 CARE05 – November 2005 13 Modelling & Simulation

14 CARE05 – November 2005 14 Active rejection Mechanical part spectral analysis signal processing observer state feedback signal rebuilding sensor actuator y c (w i ) y s (w i ) f c (w i ) f s (w i ) y(w i ) f PC + Dacq Board

15 CARE05 – November 2005 15 Active rejection State feedback State observer Signal processing Band-pass filter for the disturbance Sensor command rebuilding Actuator Algorithm for one frequency :

16 CARE05 – November 2005 16 Active rejection Development PC (host) Matlab + Simulink + XPC Target Toolboxes Dedicated PC (target) XPC Target Ethernet network Input / Output analog board Texas Instruments Plant Sample time : 0.0007 s

17 CARE05 – November 2005 17 Active rejection « steel beam » 2 loudspeakers 2 opposite PZT Accelerometer (only for monitoring)

18 CARE05 – November 2005 18 Active rejection Resonances of : - beam - support

19 CARE05 – November 2005 19 Without rejection With rejection Active rejection

20 CARE05 – November 2005 20 Resonances of : - beam - support Active rejection

21 CARE05 – November 2005 21 Active rejection

22 CARE05 – November 2005 22 Future work Simulation of the WHOLE SYSTEM: SAMCEF External perturbation Structure Dynamic Response Equations of motion Results from sensors Action of actuators MATLAB – Simulink XPC target Active Feedback Loop

23 CARE05 – November 2005 23 2.5 m 120mm 80mm 2mm Cross Section New Mock Up : fixed – free beam Future work

24 CARE05 – November 2005 24 Instrumentation of the beam : sensors & actuators sensors : Future work

25 CARE05 – November 2005 25 Deformation of PZT cells Amplified deformation of the steel shell 30 mm 15mm Force = 194 N Max. Ampl. = 52 μm Resolution = 0,5 nm Future work Actuators

26 CARE05 – November 2005 26 18 Future work Actuator

27 CARE05 – November 2005 27 Future work

28 CARE05 – November 2005 28 LAViSta L aboratories in A nnecy working on Vi bration Sta bilisation Catherine ADLOFF Benoît BOLZON Nicolas GEFFROY Andréa JEREMIE Yannis KARYOTAKIS Laurent BRUNETTI Fabien FORMOSA Jacques LOTTIN Laurent GIACOBONE Claude GIRARD Fabrice PELTIER Yan BASTIAN Franck CADOUX

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