Damage identification for multi-rotor drone using convolutional neural network technique
In contemporary society, multi-rotor drone have found extensive usage in various fields, such as agriculture, cargo transportation, and aerial photography. Damage to multi-rotor drone can compromise their safety and reduce efficiency. Therefore, early damage detection is crucial as it can prevent...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/111808/1/FK%202023%203%20IR.pdf |
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| Summary: | In contemporary society, multi-rotor drone have found extensive usage in
various fields, such as agriculture, cargo transportation, and aerial photography.
Damage to multi-rotor drone can compromise their safety and reduce efficiency.
Therefore, early damage detection is crucial as it can prevent catastrophic
failures and decrease the associated economic and human costs. At present,
visual inspection is the primary method used for detecting damage in multi-
rotor drone. However, this technique may not be entirely reliable in identifying
minor faults that are difficult to discern with the naked eye. This study focuses
on three experimental parts; firstly,to fabricate a multi-rotor drone as the
research subject; secondly, to develop a vibration data acquisition device with
MPU6050 and STM32 micro-controller,and thirdly,to identify the damage using
machine learning techniques. Damage scenarios were set by releasing the
bolts at different conjunction points of the multi-rotor body frame.Three
damaged cases were set by releasing one bolt at arm conjunction, two bolts at
arm conjunction and one bolt at motor conjunction, respectively. The first case
(undamaged) is considered as the reference. Any change in structure can
reflect in a vibration signal. Three axes vibration data were acquired under
different conditions,for the sake of safety,the UAV was conducted under the
ground with a idol motor speed. After the data collection,the data preprocessing
techniques linear interpolation method Laida criterion were adopted to process
the missing data and inconsistent data.For damage identification,three machine
learning techniques, including decision tree, random forest, K-Nearest-
Neighbours (KNN) were adopted to identify the damage for multi-rotor drone
and finally with the accuracy of 68.74%, 67.96%, 91.71%, respectively. Then,
Convolutional Neural Networks (CNN), as the state-of-the-art machine learning
technique also called deep learning was proposed and achieved outstanding
success with 100% accuracy for damage identification. It is important to
consider the parameter used in the CNN,so,in this research,the parameter
used in the CNN,including sample length, convolution kernel, number of
convolutional layer,activation function,batch-size,dropout,learning rate were
analyzed by Python platform and the best parameter were selected.In
summary, machine learning techniques can effectively detect damage for multi-
rotor drone, however,CNN technique convolutional neural network possesses
superior feature extraction capability and classification accuracy compared to
traditional machine learning techniques. |
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