Method and system for damage localization using low power guided wave

A damage localization 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 one or more inputs associated with at least one structure comprising a damage, wherein the one or more inputs comprise a velocity of a lamb wave to be used for damage localization in the at least one structure, a frequency sweep information, and a location information of a transmitter and a receiver that are placed on the at least one structure;
• perform a Vector network analyzer (VNA) sweep of a predefined frequency range on the at least one structure to form a primary guided wave resonance spectra;
• perform an Inverse Fast Fourier transform (IFFT) on the primary guided wave resonance spectra to obtain a primary time domain pulse propagation picture;
• calculate a pulse arrival time of a predefined pulse from the primary time domain pulse propagation picture;
• calculate a directional pulse arrival time of an x-directional pulse based, at least in part, on the velocity of the lamb wave and the location information of the transmitter and the receiver using a predefined directional arrival time calculation equation;
• create an auto-correlation picture by auto-correlating a template of the time domain pulse propagation picture with the time domain pulse propagation picture, wherein the template is taken from the primary time domain pulse propagation picture based on a template range, wherein the template range is decided based on the pulse arrival time of the predefined pulse;
• identify a predefined peak in the auto-correlation picture;
• determine whether the predefined peak is in a predefined time range of the directional pulse arrival time;
• calculate an arrival time of a predefined final pulse in the predefined time range upon determining that the predefined peak is not in the predefined time range of the directional pulse arrival time;
• calculate a time difference between the pulse arrival time of the predefined pulse and the arrival time of the predefined final pulse;
• and
• determine a damage location in the at least one structure based on the calculated time difference, the velocity of the lamb wave, and the location information of the transmitter and the receiver using a predefined time difference calculation equation.

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, by a damage localization system, one or more inputs associated with at least one structure comprising a damage, wherein the one or more inputs comprise a velocity of a lamb wave to be used for damage localization in the at least one structure, a frequency sweep information, and a location information of a transmitter and a receiver that are placed on the at least one structure;
• performing, by the damage localization system, a Vector network analyzer (VNA) sweep of a predefined frequency range on the at least one structure to form a primary guided wave resonance spectra;
• performing, by the damage localization system, an Inverse Fast Fourier transform (IFFT) on the primary guided wave resonance spectra to obtain a primary time domain pulse propagation picture;
• calculating, by the damage localization system, a pulse arrival time of a predefined pulse from the primary time domain pulse propagation picture;
• calculating, by the damage localization system, a directional pulse arrival time of an x-directional pulse based, at least in part, on the velocity of the lamb wave and the location information of the transmitter and the receiver using a predefined directional arrival time calculation equation;
• creating, by the damage localization system, an auto-correlation picture by auto-correlating a template of the time domain pulse propagation picture with the time domain pulse propagation picture, wherein the template is taken from the primary time domain pulse propagation picture based on a template range, wherein the template range is decided based on the pulse arrival time of the predefined pulse;
• identifying, by the damage localization system, a predefined peak in the auto-correlation picture;
• determining, by the damage localization system, whether the predefined peak is in a predefined time range of the directional pulse arrival time;
• upon determining that the predefined peak is not in the predefined time range of the directional pulse arrival time, calculating, by the damage localization system, an arrival time of a predefined final pulse in the predefined time range;
• calculating, by the damage localization system, a time difference between the pulse arrival time of the predefined pulse and the arrival time of the predefined final pulse;
• and
• determining, by the damage localization system, a damage location in the at least one structure based on the calculated time difference, the velocity of the lamb wave, and the location information of the transmitter and the receiver using a predefined time difference calculation equation.