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 transcript:

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

CARE05 – November 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

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

CARE05 – November 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

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

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

CARE05 – November  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

CARE05 – November Resolution 4Hz 0.2nm 0.6nm Measurements

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

CARE05 – November Modelling & Simulation Experimental set-up

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

CARE05 – November Modelling & Simulation

CARE05 – November Modelling & Simulation

CARE05 – November 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

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

CARE05 – November 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 : s

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

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

CARE05 – November Without rejection With rejection Active rejection

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

CARE05 – November Active rejection

CARE05 – November 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

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

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

CARE05 – November 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

CARE05 – November Future work Actuator

CARE05 – November Future work

CARE05 – November 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