Vibration studies for the QD0-support system

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Presentation transcript:

Vibration studies for the QD0-support system Nov. 19, '09 Rev1. Nov. 24, '09 Rev2. Nov. 25, '09 KEK H. Yamaoka Vibration studies for the QD0-support system Hiroshi Yamaoka KEK

At LCWS09 Conclusions at LCWS09 - Spring constant - Static loads CERN High-noise CERN small-noise CERN reference KV KH Titanium 1000kg 4000kg - Spring constant - Static loads are defined. Allowable Amplitude: < 50nm(V) (Above 5Hz) < 300nm(H) Conclusions at LCWS09 - Vibration behavior for the ILD QD0 support system was studied. Measurement data of ATF/CERN were input. Integrated amplitude of the support system was calculated.  Integ. amplitude in case of ATF and CERN high-noise are larger than 50nm at 5Hz.  Stiffness of (support tube + support position) should be increased.

New models and assumptions Fixed 1000kg Self-weight 4000x(w/650)2kg 1. Size of the tube is larger. 650x650 t50 650x650 t100 1000x1000 t50 1000x1000 t100 2. The tube is not supported by tension rods  Cantilever  Spring constant is NOT defined. 3. The tube is covered with a plate fixed by pins.

Investigations by hand-calculations BI L BO

Results Loads: Self-weight + QD0 + Cal Natural frequency Total deformation Deformation by cal. Deformation by s-weight+QD0 Deformation/Frequency is saturated even if thickness and the size is increased. This is due to the weight of calorimeter.

If the weight of the calorimeter could be removed on the tube,... Loads: Self-weight + QD0 - Deformation/Frequency is saturated even if thickness is increased. - Deformation/Frequency can be improved by increasing the size.

ANSYS calculations Deformation 650x650 t50 1st mode 2nd mode

(Cern-High noise) P.S.D. values and Integrated amplitudes Amp. >5Hz 177nm 130nm 95nm 68nm 24nm Loads: Self-weight + QD0 + Cal  Amplitude can not be improved because resonant frequency is not increased. Amp. >5Hz 61nm 33nm 24nm Loads: Self-weight + QD0  Amplitude can be improved because resonant frequency is increased.

(Cern-Small noise) P.S.D. values and Integrated amplitudes Amp. >5Hz 1.8nm 1.9nm 1.5nm 1.1nm 0.25nm Loads: Self-weight + QD0 + Cal  Amplitude can not be improved because resonant frequency is not increased. Loads: Self-weight + QD0 Amp. >5Hz 0.95nm 0.44nm 0.45nm 0.25nm  Amplitude can be improved because resonant frequency is increased.

How do you think this configuration? Fixed t50x650x650 t50x850x850 Outer tube is fixed to these plates. (Vertical plates and bottom plate) 1000kg 4000x(w/650)2kg Self-weight If the FCAL weight is supported at close to the constraint position of the tube, the deformation of the QD0 position must be small even though deformation of FACL support position is big. - Support tube consists of double square tube. - Outer tube supports FCAL. - Inner tube supports QD0.

ANSYS calculations Deformation 1st mode: 16Hz 2nd mode: 40Hz 1000kg 0.7mm 1.2mm Self-weight 4000x(w/650)2kg=6840kg 1st mode: 16Hz 2nd mode: 40Hz

P.S.D. values and Integrated amplitudes Loads: Self-weight + QD0(Inner cyl.) Self-weight + F-Cal(Outer cyl.) Amp. >5Hz 79nm(@Fcal) 45nm(@QD0) 24nm(@C-high) Amp. >5Hz 1.3nm 0.65nm 0.25nm Allowable Amplitude: < 50nm(V) (Above 5Hz) < 300nm(H)  Amplitude can be improved.

To improve vibration properties; Summary It is very difficult to improve integrated amplitudes due to the effect of the weight of calorimeter. To improve vibration properties; - Try to optimize the size of tube. - My proposal? - Matthieu-san's proposal? Next step - Carry out further calculations. - Investigations of consistency of calculations.