environmental vibrations database for kinetic energy harvesting
TRANSCRIPT
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Environmental vibrations database for kinetic energy harvesting
Igor Neri
Workshop "Energy management at micro and nanoscale" - 4/5 August 2011 - Perugia, Italy
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This project is part of NANOPOWER project and it is devoted to the realization of database containing digital time series and spectral representations of experimentally acquired vibration signals.
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www.vibration.db.umu.se
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www.vibration.db.umu.se
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www.opensignals.net
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Outline• Vibration Database
• Acquisition kits
• Methodology
• Storage and presentation
• Examples
• Energy Harvesting applications
• Simulations
• Experiment
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Vibration Database
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The data present in the database are acquired using two acquisitions system
Acquisitions Kits
Kit-1 Kit-2
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Kit-1
Accelerometer
• Model 7132A Measurement Specialist
• Bandwidth 0.4 - 9000 Hz (2dB)
• Natural frequency 37 kHz
• Sensitivity 100mV/g
• Residual noise (g RMS) 0.0005 g
• Weight 14 grams
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Kit-2
Slam Stick™ Vibration Recorder
• Max Acceleration (each axis) 16 g
• Sampling Rate (each axis) 3.2 kHz
• X,Y axis noise 0.016 g
• Z axis noise 0.022 g
• Max Recording Time at 3.2 kHz 240 s
• Weight 14 gram
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• Expected Frequency Content (Sampling Frequency, Acquisition time)
• Amplitude (Resolution, Sensitivity)
• Sensor - Source ratio
• Mounting conditions
Acquisition Methodology
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PCB PIEZOTRONICS - Operating Guide
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Once determined the Kit to be used and the acquisition parameters the acquisition can be performed. At the end of acquisition process a data file is produced containing:
• acceleration time series
• metadata information
• PSD plot
This file is used to automatically create an entry on the database.
Acquisition
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Database Interface
The database interface is realized using the Content Management System Drupal that provide a web interface to navigate, search and download the vibration data.
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Anonymous• Description• Power spectral density plot• Statistical informations• No download available
Authenticated users• Download available for a set of selected signals
Partnership users• Full download
Access Policy
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Examples
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Pendulum...
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Pendulum...
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Down stairs (belt)
Acc
eler
atio
n (g
)
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Climbing stairs (ankle)
Acc
eler
atio
n (g
)
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Tim
e (s
)
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Automotive... with very low CO2 emission
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Tim
e (s
)
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Tim
e (s
)
ISO 8608:1995 Mechanical vibration -- Road surface profiles
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Tim
e (s
)
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Tim
e (s
)
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Energy Harvesting applications
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Selected noises
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Simulations�
mx = −∂U(x)∂x − γx−KvV + ξz
V = Kcx− 1τp
V
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Simulations�
mx = −∂U(x)∂x − γx−KvV + ξz
V = Kcx− 1τp
VNoise from DB
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Simulations�
mx = −∂U(x)∂x − γx−KvV + ξz
V = Kcx− 1τp
VNoise from DB
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Simulations
U(x) =12kx2 +
µ0
2π
M2
(x2 + ∆2)3/2
�mx = −∂U(x)
∂x − γx−KvV + ξz
V = Kcx− 1τp
VNoise from DB
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5 10 15 2010 9
10 8
10 7
10 6
10 5
10 4Po
wer(W)
(mm)
CarTrainMicrowave oven
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Experiment
Piezo
Magnets
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• We developed a digital library of vibration signals
• At this time there are ~150 entry on the database
• Some test on energy harvester have been performed with selected signals from the database
Conclusions