30 July 2014 Gwo-Sheng Peng (on behalf of Mr. Jiun-Kai Chen) Center for Measurement Standards/...
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Transcript of 30 July 2014 Gwo-Sheng Peng (on behalf of Mr. Jiun-Kai Chen) Center for Measurement Standards/...
30 July 2014
Gwo-Sheng Peng (on behalf of Mr. Jiun-Kai Chen)
Center for Measurement Standards/ Industrial Technology Research Institute Tel: +886-3-5743773
E-mail: [email protected]
UNIQUE TYPE OF PRIMARY HIGH SHOCK CALIBRATION SYSTEM USING ELECTROMAGNETIC EXCITER
Copyright 2014 ITRI 工業技術研究院
OutlineOutline
1. Motivation
2. Calibration methods
3. Measurement setup
4. Preliminary results
5. Conclusions
Copyright 2014 ITRI 工業技術研究院
Motivation: Motivation: additional requests from industryadditional requests from industry
100 1 000 10 000 100 000 1 000 000 m/s2
NML Low shock : 200~10 000 m/s2
500~5 000 m/s2
15 000~30 000 m/s2Electric component
100~200 m/s2Laptop
Electric connector
500~15 000 m/s23C 、 Cellphone 、GPS
500~1 000 m/s2Industrial PC
500~50 00 m/s2Motor electric instrument panel
500~1 000 m/s2Optical Lens500~1 000 m/s2Parking Sensor
120 000 m/s2Airbag
100 000 m/s2Fire engine impact test
300 000 m/s2Damage test
ISO 16063-13 : Rigid body motion
ISO 16063-13 : Hopkinson bar
NML High shock
10 000~1 000 000 m/s2
Military Equients
Copyright 2014 ITRI 工業技術研究院
Motivation : Fulfill Traceability Motivation : Fulfill Traceability ChainChain
Extend range to 100 000 m/s2
Requests extend to at least 30 000 m/s2
U : 2.1 % to 2.6 %
U : 1.0 %
Copyright 2014 ITRI 工業技術研究院
1. Calibration capability: 1 000 ~10 000 m/s2
U : 2.1 % to 2.6 %
Range to be extended
2. Transferring standard calibrated by NML Primary Low shock calibration system.
Scope
Amplifier
Std. Acc.
Cal. Acc.
Steel ball
Air pump
Air
Throttle
Vacuum control
Suck device
Computer
GPIB
NML- comparative calibration systemNML- comparative calibration system
Copyright 2014 ITRI 工業技術研究院
ISO 16063-13 ISO 16063-13 Methods for the calibration of vibration and Shock transducers — Primary shock calibration using laser interferometry
Acceleration peak value:100 m/s2 to 5 000 m/s2
Acceleration peak value:1 000 m/s2 to 100 000 m/s2
PC
8
1213
1
2
4 36 5
9
10 0° 90°11 7
Rigid body motionWave propagation inside a long
thin bar - Hopkinson bar
Primary shock calibration methodsPrimary shock calibration methods
Copyright 2014 ITRI 工業技術研究院
Primary low shock calibration system: Primary low shock calibration system: Rigid body motionRigid body motion
PC
8
1213
1
2
4 36 5
9
10
0° 90°11 7
1:Shock machine 2: Electromagnetic exciter 3:Airborne hammer 4:Pad 5:Airborne anvil 6:Accelerometer 7:Amplifier 8:Digital waveform recorder 9:Laser10:Interferometer11:Light detectors12:1st seismic block13:2nd seismic block
Calibration capability : 200 m/s2 to 10 000 m/s2
Uncertainty: 1.0 %
Copyright 2014 ITRI 工業技術研究院
TypeForce
ControlCost
Shock accelerationNoise
Repeat. Low g High g
Comp. air
OK Higher OK Poor OK Quiet
Electro-magneti
cBetter Lower Better OK OK OK
Electromagnetic ExciterElectromagnetic Exciter
Specification of NML Electromagnetic exciter
Input: AC 110/220 V, 1Φ 2W 50/60 HzVoltage: (0 to 150) VCurrent: (0 to 10) AMax. output force: 1000 N
Comparison of Shock ExciterComparison of Shock Exciter
Copyright 2014 ITRI 工業技術研究院
Procedures of calibrationProcedures of calibration
t2
a2,max
t3
V3,maxLaser
interferometerAnvil
Laser interferometer
Accelerometer
Displace-ment
Low passfilter
Differen-tiation(Vel.)
Low passfilter
Differen-tiation(Acc.)
apeak
Acc.Low passfilter
upeak
peak
peaksh a
uS
According to ISO 16063-13:2001
apeak
AccelerometerCharge
amplifier t1
a1,maxupeak
Copyright 2014 ITRI 工業技術研究院
displacement measurementdisplacement measurement
ideally
u1 : 1+cosφ
u2 : 1+cos(π/2+φ)
ISO 16063-13:2001 Methods for the calibration of vibration and Shock transducers — Primary shock calibration using laser interferometry
Lissajous figure
practically
Copyright 2014 ITRI 工業技術研究院
Interferometer signals :
V h ax cos( )V k by cos( )
ref: Chien-ming Wu, et al., Correction of nonlinearity in one-frequency optical interferometry, Meas. Sci. Technol. 7 (1996) 520–524
Elliptical parameters are obtained by least squares fitting and then displacements are calculated.
Data processing for displacements
Copyright 2014 ITRI 工業技術研究院 30 July 2014
Primary high shock calibration system: Primary high shock calibration system: Hopkinson-barHopkinson-bar
Copyright 2014 ITRI 工業技術研究院
Main components of high shock Main components of high shock calibration systemcalibration system
Interferometer Shock machine
0° 90°
Copyright 2014 ITRI 工業技術研究院
Vel
oci
ty
(m/s
)V
olta
ge (
V)
Preliminary results Preliminary results
Peak=54.9 V @ 0.161ms
Vel.:
0.567967 m/s @ 0.161 ms
0.618869 m/s @ 0.162 ms
Acc= 50863 m/s2
Sen.=1.079 mV/(m/s2)
Signal from Acc.Time (s)
Signal from interferometerTime (s)
Vel
oci
ty
(m/s
)
Time (s)Time (s)
Copyright 2014 ITRI 工業技術研究院
1st 2nd 3rd 4th 5th 6th Avg. Std.
Peak value from accelerometer (V)
54.9 55.6 55 55.15 55.46 54.97 55.180.29
(0.5%)
Peak value from laser interferometer (m/s2)
50862 50762 50805 50788 50825 50838 5081335.9
(0.07%)
Sensitivity from electro-magnetic exciter(mV/(m/s2))
1.079 1.095 1.083 1.086 1.091 1.081 1.0860.0062(0.6%)
Sensitivity calibrated by PTB(mV/(m/s2))
1.112
Preliminary results Preliminary results
Copyright 2014 ITRI 工業技術研究院
1. A unique compact electromagnetic exciter was built to produce stable shock force for low and high shock calibration systems.
2. Installation and operation of the electromagnetic exciter are simple, automatic operation of the calibration system will later be implemented.
3. Need to complete the uncertainty evaluation and check the system performance with PTB calibrated value.
ConclusionsConclusions