The analysis of airborne acoustics of S.A.W. using neural networks
K.L. Burge
T.J. Harris
Raymond Stroud
John McCardle
2134/26280
https://repository.lboro.ac.uk/articles/conference_contribution/The_analysis_of_airborne_acoustics_of_S_A_W_using_neural_networks/9340382
The analysis of acoustic emissions for machine health monitoring has made rapid
advances in the last five years due to a revival of interest in the application of Artificial
Neural Networks (ANNs). Complex signal analysis, which has often thwarted
conventional statistical methods and expert systems, is now more possible with the
introduction of 'neural' based computing methods.
Acoustic emissions from welding processes are well documented. In particular, it has
been established that a manual welder is capable of making intrinsic decisions concerning
electrode position based on process noise.
The analysis of time / amplitude signals and Fast Fourier Transforms (I-I-1s), within
salient frequency bandwidths of the weld acoustic, has yielded erratic, unpredictable and
noise polluted data. Extracting a meaningful interpretation from this data is
computationally intensive when utilising standard statistical methods and leads to data
explosions, especially when an 'on-line' corrective control signal is required.
An Artificial Neural Network is 'trained' on examples from acquired data and performs a
robust signal recognition task rather than relying on a programmed set of data samples as
in the case of an expert system. This technique enables the network to generalise and, as
a consequence, allows the input data to be erratic, erroneous and even incomplete.
This research defines the development of a hybrid system, utilising high speed date
capture and 141-1' computation for the signal pre-processing and a 'self organising'
network paradigm to establish weld stability and real time corrective control of the
process parameters.
The paper describes a successful application of a Neural Network hybrid system to
determine weld stability in submerged arc welding (S.A.W) through the interpretation of
airborne acoustics.
2017-08-31 10:03:00
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