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 |
|
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