Communications: electrical – Condition responsive indicating system
Reexamination Certificate
2006-07-11
2006-07-11
Pope, Daryl C (Department: 2632)
Communications: electrical
Condition responsive indicating system
C340S506000, C340S517000, C340S679000, C340S683000
Reexamination Certificate
active
07075424
ABSTRACT:
A sensor array for non-destructively monitoring a structure to detect a critical structural event. The sensor array includes a plurality of discrete sensor nodes, each of the discrete sensor nodes producing an electrical signal in response to a structural event. A signal adder is electrically connected to the plurality of discrete sensor nodes for receiving and combining the electrical signal from each of the discrete sensor nodes to form a single sensor array output signal. A signal processing module then receives and processes the single sensor output signal. In the preferred embodiment, the signal processing module uses the time interval between the electrical signals from each of the discrete sensor nodes formed into a single sensor array output signal to calculate the location of the critical structural event. Also, in the preferred embodiment, a data collection system is located downstream of the sensor processing module.
REFERENCES:
patent: 3787700 (1974-01-01), Chasson
patent: 5894651 (1999-04-01), Dvorsky et al.
patent: 5929315 (1999-07-01), Dunegan
patent: 5932807 (1999-08-01), Mallart
patent: 6006163 (1999-12-01), Lichtenwalner et al.
patent: 6076405 (2000-06-01), Schoess
patent: 6370964 (2002-04-01), Chang et al.
patent: 6399939 (2002-06-01), Sundaresan et al.
patent: 6923062 (2005-08-01), Franz et al.
Sundaresan and Shankar, The Use of AET for Classifying Failure Modes in Composite Materials, ASME Winter Annual Meeting, New Orleans, LA, Nov. 23-Dec. 3, 1993.
Sun, et al., Structural Frequency Response Function Acquisition Via Electric Impedance Measurement of Surface-Bonded Piezoelectric Sensor/Actuator from the American Insitute of Aeronautics and Astronautics, pp. 3450-3458, 1995.
Prosser, et al., Advanced Waveform Based Acoustic Emission Detection of Matrix Cracking in Composites; Materials Evaluation, vol. 53(9), pp. 1052-1058, Sep. 1995.
ACX (Active Control eXperts); Information from the Internet; copyright 1996-2000.
Schoess, et al, Rotor Acoustic Monitoring System (RAMS)- A Fatigue Crack Detection System American Helicopter Society (AHS) FORUM 53, Virginia Beach, VA, May 1, 1997.
Hagood and Pizzochero, Residual Stiffness and Actuation Properties of Peizoelectric Composites: Theory and Experiment from Journal of Intelligent Material Systems and Structures, vol. 8, Sep. 1997.
Chee et al., Review on the Modelling of Piezoelectric Sensors and Actuators Incorporated in Intelligent Structures from the Journal of Intelligent Material Systems and Structures, vol. 9—Jan. 1998.
Bent and Hagood, Piezoelectric Fiber Composites with Interdigitated Electrodes; Journal of Intelligent Material Systems and Structures, vol. 8, Oct. 1998.
Prosser, Acoustic Emission Structural Health Monitoring, Aviation Safety NRA Meeting, Dec. 17, 1998.
NASA, Tech Briefs, vol. 23, No. 10, Oct. 1999.
Continuum Control Corp., An innovative provider of piezoelectric components and integrated systems for motion control, and vibration suppression, 1999.
Sundaresan et al., Damage Detection Using A Layer Vibrometer and Active Fiber Composite Patch, Sixth Annual International Conference on Composites Engineering, Orlando, FL, Jun. 27-Jul. 3, 1999.
Schulz, et al., Distributed Sensing for Health Monitoring of Composite Materials, Composites in the Transportation Industry Conference, Feb. 14-18, 2000.
Sundaresan, M.J., et al., “Linear Location of Acoustic Emission Sources with a Single Channel Distributed Sensor,” Journal of Intelligent Material Systems and Structures, vol. 12, No. 10, pp. 689-700, Oct. 2001. (Copy unavailable).
Cordell, Tobey M., Life management of aging air force aircraft: NDE prespective, SPIE vol. 2455, pp. 34-44, 1995.
Komsky and Achenbach, Ultrasonic imaging for corrosion and fatigue cracks in multilayered airplace structures; article from Center for Quality Engineering and Failure Prevention, SPIE vol. 2945, pp. 380-388, 1996.
Acoustic Emission Sensing Using Piezoceramic and Active Fiber Composite Patches; article from University of Missouri; undated *** Copy not available.
Blanas et al., Article entitled Active Composite Materials and Damage Monitoring; undated.
CeraNova Corporation; Active Composites for Smart Structures; information from internet; copyright 2000.
Lichtenwainer, et al., Active Damage Interrogation System for Structural Health Monitoring; SPIE vol. 3044, pp. 186-194, 1997.
Seydel and Chang, Implementation of a Real-Time Impact Identification Technique for Stiffened Composite Panels; Dept. of Aeronautics and Astronautics, Stanford University.
Wang and Chang, Built-In Diagnostics for Impact Damage Identification of Composite Structures; Stanford University; undated.
Ghoshal, A.; Sundaresan, M. J.; Schulz, M. J.; Pai, P. F. “Structural Health Monitoring Techniques for Wind Turbine Blades,” Journal of Industrial Aerodynamics and Wind Power Engineering, vol. 85, pp. 309-324, 2000.
Ghoshal Anindya
Schulz Mark J.
Sundaresan Mannur J.
,MacCord Mason PLLC
North Carolina A&T State University
Pope Daryl C
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