Identification of shaft orbit for hydraulic generator unit using chain code and probability neural network

Fault diagnosis of rotor using EMD thresholding-based de-noising combined with probabilistic neural network

“…Peng et al [1] extracted maxima lines and corresponding Lipschitz exponents based on wavelet modulus maxima and processed them into feature vectors to detect fault. Wang et al [2] proposed a kind of shaft orbit representation by using the chain code and shape numbers and obtained a desirable effect. Different from shaft orbit, spectrum analysis focuses on the inherent properties, such as the frequency, amplitude and phase of fault signals, which are easier to be diagnosed accurately.…”

A New Dynamic Intelligent Time Domain Arc Furnace Modeling based on Combination Adaptive Neuro-fuzzy Inference System and Chain Code

“…"CDCDCA," "CDCCCA," "CACCD," "DCCCA," etc., for instance, can be detected as pulses. Therefore, due to the big length and change of the string obtained, one cannot apply the substring search algorithms, such as longest common string (LCS) [17] or Levenshtein distance [18] to a signal string at this stage. To solve this problem, a label compression algorithm including two steps is used.…”

“…This direction can be four or eight, etc. One of the popular chain codes includes the Freeman chain code of eight directions [17,18]. More details of chain code can be found in [19,20].…”

Unsigned Manhattan chain code

“…Chain codes are not used just for representing the boundaries of geometric shapes, but also serve for various operations on them as for example: image registration [7], free-form feature representation [8], estimation of physical properties [9], font representations within embedded systems [10], hand-written character recognition [11], medial axis description [12], and others [13][14][15][16]. In the shape representation it is desirable that the chain code supports the rotation (at least for a multiplier of 90°), scaling (the enlargement by the multiplier of 2), and mirroring.…”