Wireless Measuring System Based on Cochlea Principle for Acquiring Dynamic Response of Constructional Structure

• US 20160011153A1
• Filed: 02/25/2015
• Published: 01/14/2016
• Est. Priority Date: 02/26/2014
• Status: Active Grant

• Current Assignee: Industry Foundation Of Konyang University
• Original Assignee: Industry Foundation Of Konyang University
• Inventors: Heo, Gwang Hee, Jeon, Joon Ryong
• Granted Patent: US 9,903,841 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01N 2291/0232 Glass, ceramics, concrete or stone
• CPC Class Codes: G01N 2291/0258 Structural degradation, e.g. fatigue of composites, ageing of oils
• CPC Class Codes: G01N 29/14 using acoustic emission techniques echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00
• CPC Class Codes: G01N 29/42 by frequency filtering or by tuning to resonant frequency
• CPC Class Codes: G01N 29/4472 Mathematical theories or simulation

Abstract

Provided is a wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure and capable of monitoring and controlling health of the constructional structure in real time by acquiring the dynamic response of the constructional structure in which irregular random vibrations occur, effectively compressing the acquired data, wirelessly transmitting a signal, and analyzing the transmitted signal.

Claims

1. A wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure in order to evaluate health and a state of the constructional structure, comprising:

a sensing unit including an acceleration sensor sensing vibrations of the constructional structure and deconstructing measured signals output from the acceleration sensor and having frequency components for each specific frequency component, reconstructing the deconstructed signals, and then sampling and compressing only peaks; and

a main computer receiving the measured signals compressed by the sensing unit and monitoring and analyzing the health and the state of the constructional structure,

wherein the sensing unit and the main computer transmit and receive signals using a wireless transmitting and receiving means.

2. The wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure of claim 1, wherein the sensing unit has a program embedded therein, the program being to perform:

a deconstructing process of extracting signals in specific frequency ranges from the measured signals output from the acceleration sensor using a band pass filter unit including a plurality of band pass filters having different central frequencies or bandwidths,

a reconstructing process of reconstructing filtered signals based on the central frequencies and the bandwidths of the plurality of band pass filters, and

a compressing process of sampling peak data by applying a peak picking algorithm to the reconstructed signals.

3. The wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure of claim 2, wherein the sensing unit calculates a reconstruction error J and allows the central frequencies and the bandwidths of the plurality of band pass filters to be determined based on the calculated reconstruction error.

4. The wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure of claim 3, wherein the sensing unit calculates a reconstruction error J to a data compression rate (CR) and allows the number of band pass filters to be determined based on the calculated reconstruction error to the data compression rate.

5. The wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure of claim 1, wherein the main computer applies a programmed control algorithm to the measured signals transmitted from the sensing unit to generate a feedback signal controlling the sensing unit and transmits the feedback signal to the sensing unit through the wireless transmitting and receiving means to control the sensing unit.

6. The wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure of claim 5, further comprising a damper connected to the sensing unit, attached to the constructional structure, and damping vibrations,

wherein the main computer allows a signal driving the damper to be included in the feedback signal in order to damp the vibrations of the constructional structure.

7. The wireless measuring system based on a cochlea principle for acquiring a dynamic response of a constructional structure of claim 1, further comprising a power supplying unit for supplying power to the sensing unit,

wherein the power supplying unit uses self power generation or uses any one of environment-friendly energy sources including a solar heat source, a wind force source, and a vibration source.