On-board Dynamic Strain System For Turbine Engine Ground Testing

摘要

A dynamic strain measurement system feasibility demonstrator for turbine engine ground-testing applications was developed as the product of a Small Business Innovative Research (SBIR) Phase 1 contract. System specifications include 40-kHz minimum bandwidth, 0 to 65 ℃ operating temperature, IEEE-1451 ('smart sensor plug and play') compliance, and synchronized sampling per IEEE-1588. The transducer interface for each channel features hardware-configurable bridge completion, an instrumentation amplifier, a remotely configurable anti-aliasing filter, and a combined A-D/microcontroller on a 5-sq-in. circuit board. The A-D/microcontroller stores essential transducer information locally and converts the amplified analog signal to digital data. The network interface from 12 transducer channels to the host computer comprises a field-programmable gate array (FPGA) and a microprocessor with integral IEEE-1588. Data systems of this type will reduce engine test cell wiring to the control room, improve noise immunity, reduce engine installation time, enable faster calibration, and reduce per-channel instrumentation cost.