Method and system for unobstrusive automatic leak event detection in real-time conduit by template selection

A system, comprising:

• a memory storing instructions;
• one or more communication interfaces;
• and
• one or more hardware processors coupled to the memory via the one or more communication interfaces, wherein the one or more hardware processors are configured by the instructions to:
• receive, data associated with a first sensing unit and a second sensing unit, wherein the first sensing unit and the second sensing unit are placed in a proximity of a conduit at a test environment, wherein the first sensing unit corresponds to a pressure sensor placed inside the conduit at the test environment, for obtaining a pressure data (Pr), and wherein the second sensing unit corresponds to an accelerometer sensor placed on an outer surface of the conduit at the test environment, for obtaining an accelerometer data (Accel);
• process, the data associated with the first sensing unit to obtain an instant timing information (T0) of a leak event in the conduit at the test environment, wherein the instant timing information (T0) is obtained by detecting a variation in a steady state of a pressure value of a fluid at the conduit at the test environment;
• process, the data associated with the second sensing unit to obtain a transient signal associated with the leak event at a specific band by applying a continuous wavelet transformation (CWT);
• filter, by a bandpass filter, the accelerometer data (Accel) to obtain a band passed filtered accelerometer signal (Accelbpf) with a low pass cut-off frequency and a high pass cut-off frequency by eliminating unnecessary computations;
• process, the band passed filtered accelerometer signal (Accelbpf) to obtain a duration (Ta) of the leak event;
• truncate, the band passed filtered accelerometer signal (Accelbpf) in a time domain from the instant timing information (T0) to the duration (Ta) of the leak event to obtain a temporal template signal (Acceltemplate);
• receive, data associated with a sensing unit, wherein the sensing unit corresponds to an accelerometer sensor placed on an outer surface of a real-time conduit of a physical environment, for obtaining an accelerometer data and the data is recorded continuously;
• filter, by a bandpass filter, the accelerometer data to obtain a band passed filtered accelerometer signal (Accelbpf) associated with the real-time conduit with a low pass cut-off frequency and a high pass cut-off frequency;
• cross-correlate, the band passed filtered accelerometer signal (Accelbpf) associated with the real-time conduit at the physical environment and the temporal template signal (Acceltemplate) for every successive window of T0 to Td length to obtain a cross correlation value;
• and
• dynamically detect, a leak event of the real-time conduit at the physical environment when the cross-correlation value is greater than a threshold value (∝), and communicate an alarm notification thereby reducing a false alarm rate during routine pipe maintenance, wherein when leak occurs a low frequency negative pressure wave (NPW) is generated from a leak orifice and the NPW has low frequency components which travels long distance in both upstream and downstream directions;
• isolate, the NPW from other vibrational generating events on the real-time conduit based on the cross-correlation value and the threshold value (∝).

One or more non-transitory machine-readable information storage mediums comprising one or more instructions which when executed by one or more hardware processors cause:

• receiving, data associated with a first sensing unit and a second sensing unit, wherein the first sensing unit and the second sensing unit are placed in a proximity of a conduit at a test environment, wherein the first sensing unit corresponds to a pressure sensor placed inside the conduit at the test environment, for obtaining a pressure data (Pr), and wherein the second sensing unit corresponds to an accelerometer sensor placed on an outer surface of the conduit at the test environment, for obtaining an accelerometer data (Accel);
• processing, the data associated with the first sensing unit to obtain an instant timing information (T0) of a leak event in the conduit at the test environment, wherein the instant timing information (T0) is obtained by detecting a variation in a steady state of a pressure value of a fluid at the conduit at the test environment;
• processing, the data associated with the second sensing unit to obtain a transient signal associated with the leak event at a specific band by applying a continuous wavelet transformation (CWT);
• filtering, by a bandpass filter, the accelerometer data (Accel) to obtain a band passed filtered accelerometer signal (Accelbpf) with a low pass cut-off frequency and a high pass cut-off frequency by eliminating unnecessary computations;
• processing, the band passed filtered accelerometer signal (Accelbpf) to obtain a duration (Td) of the leak event;
• truncating, the band passed filtered accelerometer signal (Accelbpf) in a time domain from the instant timing information (T0) to the duration (Ta) of the leak event to obtain a temporal template signal (Acceltemplate);
• receiving, data associated with a sensing unit, wherein the sensing unit corresponds to an accelerometer sensor placed on an outer surface of a real-time conduit of a physical environment, for obtaining an accelerometer data and the data is recorded continuously;
• filtering, by a bandpass filter, the accelerometer data to obtain a band passed filtered accelerometer signal (Accelbpf) associated with the real-time conduit with a low pass cut-off frequency and a high pass cut-off frequency;
• cross-correlating, the band passed filtered accelerometer signal (Accelbpf) associated with the real-time conduit at the physical environment and the temporal template signal (Acceltemplate) for every successive window of T0 to Td length to obtain a cross correlation value;
• and
• dynamically detecting, a leak event of the real-time conduit at the physical environment when the cross-correlation value is greater than a threshold value (∝), and communicating an alarm notification thereby reducing a false alarm rate during routine pipe maintenance, wherein when leak occurs a low frequency negative pressure wave (NPW) is generated from a leak orifice and the NPW has low frequency components which travels long distance in both upstream and downstream directions;
• isolating, the NPW from other vibrational generating events on the real-time conduit based on the cross-correlation value and the threshold value (∝).