Structural Health Monitoring System (SHMS)

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.

Designed to RTCA/DO-160D

Product Features:

  • Twenty-six strain gauge inputs
  • +10 Vdc strain sensor excitation output
  • Six ±10 VDC differential inputs
  • Two RS-422 / One RS-232 ports
  • Four Rx / Two Tx ARINC 429 ports
  • Four high / four low level discrete inputs
  • Four high / four low level discrete outputs
SUMMARY SPECIFICATIONS—DAPU
Input voltage: +18 to 36 VDC
Power consumption: < 3 Watts
Weight: < 6 pounds
Strain gauge inputs (26): ±51.25 mV
Strain gauge excitation: +10 Vdc @ 500 mA
Analog channels (6): ± 10 Vdc differential
Communication interfaces: RS-232 (1)
RS-422 (2)
ARINC 429 Rx (4)
ARINC 429 Tx (2)
Memory capacity: 128 Mb Flash
Expandable to 256 Mb
Discrete inputs (8): Open/+28 Vdc (4)
Ground/open (4)
Discrete outputs (8): Open/ground (4)
Open/+28 Vdc (4)
Operating environment: -40°C to +71°C
SUMMARY SPECIFICATIONS—CDU
Input voltage: +18 to 36 VDC
Power consumption: < 3 Watts
Weight: < 2.5 pounds
Keypad: 16 Keys
Tactile Feedback
Membrane Keys
Green Backlighting
Display: Two Lines
16 Characters Per Line
Alphanumeric and Symbols
16 Programmable Symbols
Green LED
Dimming: Keypad and Display
0 to 5 Vdc
0 to 110 Vac optional
Communication interfaces: (1) RS-232
(2) RS-422
Operating environment: -40°C to +55°C