Reported is on the development and test of an integrated structural health monitoring and reporting (SHMR) system for use on Navy aircraft. The goal was to develop and test a versatile, fully programmable SHMR system, designed to synchronize and record data from a range of wireless and hard wired sensor and active RFID networks. Wireless sensors include strain gauges, accelerometers, and load/torque cells. Data were collected at multiple sampling rates and time stamped and aggregated within a single scalable database on a base station, termed the wireless sensor data aggregator (WSDA). The WSDA, in addition to providing a central location for collecting data, also provided a beaconing capability to synchronize each sensor node's embedded precision timekeeper. High speed wireless sensor nodes were demonstrated to be capable of data logging at sample rates of up to 50 K samples/second, while consuming nearly equal 9 milliamps at 3 VDC (27 milliwatts). The high sample rate nodes can operate perpetually, without batteries, by using miniature vibration energy harvesters, which provided 37 milliwatts of continuous DC power under conditions replicating a helicopter gearbox. Scalable networks of RFID nodes with > 20 years coin cell battery life were also demonstrated. Wireless node network initial synchronization in response to a centrally broadcast network command, such as to initiate node sampling, or to synchronize node time keepers, was measured at +/- 4 microseconds. With the time synchronization beacon sent only at the onset of a two hour long test, and with simultaneous exposure to temperatures of -40 to +85 deg C, the system's timing accuracy was nearly equal 5 milliseconds. The system was demonstrated to be capable of supporting both high sample rate burst and periodic sampling modes, with accurate wireless network timing synchronization.
Synchronized system for wireless sensing, RFID, data aggregation, & remote reporting
Synchronisiertes System für Funkmessung, Hochfrequenzkennzeichnung, Datenaggregation und Fernmeldung
AHS International, Annual Forum, 65 ; 939-945
2009
7 Seiten, 8 Bilder, 5 Tabellen, 7 Quellen
Aufsatz (Konferenz)
Englisch
Synchronized System for Wireless Sensing, RFID, Data Aggregation, & Remote Reporting
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