Structural Health Monitoring System
(SHMS)
SHMS Brochure
Systems & Electronics, Inc. (SEI) Structural Health
Monitoring System
(SHMS) is the airborne portion of SEI’s Health and Usage Monitoring System
(HUMS). It consists of a Data Acquisition and Processing Unit (DAPU), a Data
Storage Unit (DSU), and an optional Control/Display Unit (CDU). The DAPU has
analog, discrete, and strain gauge inputs, discrete outputs, as well as RS-422
and ARINC 429 data buses. The DSU has 128 Mb of non-volatile memory, expandable
to 256 Mb. The CDU has 16 keys and a 2 line, 16 character display, dimmable
along with aircraft instruments. The SHMS low power consumption, light weight,
and small size allow for easy aircraft installation.
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Designed to RTCA/DO-160D .
Product Features:
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Twenty-six strain gauge
inputs
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+10 Vdc strain sensor excitation output
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Six ±10 VDC differential inputs
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Two RS-422 / One RS-232 ports
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Four Rx / Two Tx ARINC 429 ports
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Four high / four low level discrete inputs
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Four high / four low level discrete outputs
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SUMMARY SPECIFICATIONS—DAPU |
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Parameter |
Specification |
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Input voltage |
+18 to 36 VDC |
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Power consumption |
< 3 Watts |
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Weight |
< 6 pounds |
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Strain gauge inputs (26) |
±51.25 mV |
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Strain gauge excitation |
+10 Vdc @ 500 mA |
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Analog channels (6) |
± 10 Vdc differential |
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Communication interfaces |
RS-232 (1)
RS-422 (2)
ARINC 429 Rx (4)
ARINC 429 Tx (2) |
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Memory capacity |
128 Mb Flash Expandable to 256 Mb |
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Discrete inputs (8) |
Open/+28 Vdc (4) Ground/open
(4) |
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Discrete outputs (8) |
Open/ground (4) Open/+28 Vdc
(4) |
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Operating Environment |
-40°C to +71°C |
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SUMMARY SPECIFICATIONS—CDU |
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Parameter |
Specification |
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Input voltage |
+18 to 36 VDC |
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Power consumption |
< 3 Watts |
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Weight |
< 2.5 pounds |
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Keypad |
16 Keys
Tactile Feedback
Membrane Keys
Green Backlighting |
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Display
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Two Lines
16 Characters Per Line
Alphanumeric and Symbols
16 Programmable Symbols
Green LED |
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Dimming |
Keypad and Display
0 to 5 Vdc
0 to 110 Vac optional |
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Communication interfaces
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(1) RS-232
(2) RS-422 |
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Operating Environment |
-40°C to +55°C |
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