Hold Down Release Mechanism (HDRM)
Sierra Space
Sierra Space’s Hold Down Release Mechanism (HDRM) is a fast-acting separation nut rated to accommodate several working preloads. The HDRM series uses a conventional segmented separation nut with a redundant shape memory alloy (SMA) trigger that responds to a standard pyrotechnic firing pulse, enabling fast response times with low release shock.Integral circuit interrupts open trigger […]
Typed specifications45 values
Discloses 6 of 10 fields engineers filter by in this category (category median 2).
- Mass
- 270 g max · 270 g max. (9.52 oz max.) · datasheet p.2
- Preload / holding force
- 15.13 kN Nominal Working Preload · datasheet p.130 17.79 kN max · Maximum Operating Load Capability | 21.35 kN Nominal Working Preload | 23.58 kN max · Maximum Operating Load Capability
- Release time
- 15 ms min · over operational environment conditions · datasheet p.130 200 ms max · over operational environment conditions
- Release shock
- 400 g max · datasheet p.130
- Power consumption
- 45 W power input, typical: 45 W @ 3.5 A @ 20 °C · datasheet p.2 45 W Typical @ 20 °C
- Operating temperature
- -45 °C min · datasheet p.130 75 °C max | -45–75 °C operating temperatures (-49 °F to +167 °F)
- Separation type
- pyrotechnic datasheet p.129 point separation bolts or nuts conventional segmented separation nut with redundant shape me… | SMA or frangibolt
- Release command type
- pyro firing pulse SMA trigger responds to a standard pyrotechnic firing pulse · datasheet p.1
- Command pulse duration
- 35 ms release signal, typical @ 20 °C · datasheet p.2 15 ms Range | 15 ms min · operating temperatures | 35 ms typ. | 160 ms max · operating temperatures +2
- Cycles / reuses
- 1 max · product page
- Connector
- Lead-wire: 4x 22 AWG (Mil-W-22759/33) datasheet p.2
- Survival temperature
- -80 °C min · datasheet p.130 75 °C max | -80–75 °C nonoperating temperatures (-112 °F to +167 °F)
- Random vibration
- 36 g RMS random vibration · datasheet p.2
- Flight heritage
- Heritage Programs: STPSat-1; WorldView-1, -2, and -3; P-POD; AEHF; CYGNSS; NanoRacks Kaber Microsat Deployer; CNOFS; XSS-10; ESA Swarm; SCaN Testbed; SMART-1; FalconSAT-1; Kestral Eye-2M datasheet p.2
- Shock qualification
- 400 g datasheet p.130 400 g max · source shock < 400 g (expected)
- Release command (as printed)
- Typical: 3.5 A, 35 msec @ 20 °C; Range: 2.3 A to 7 A, 15 msec to 160 msec datasheet p.2
- Release current
- 3.5 A release signal, typical @ 20 °C · datasheet p.2 2.3 A all-fire (200 msec) | 2.3 A all-fire current (200 msec) | 0.25 A no-fire | 2.3 A Range +6
Each value is typed with its unit and measurement condition and cites the datasheet page it was taken from. Nothing is guessed: a field that is absent here has not been published by the manufacturer. machine-extracted ✓ checked by NewSpace Market ✓ manufacturer confirmed by the manufacturer.
As published by the supplier3 lines, in the manufacturer's own wording
- Trigger mechanism
- Redundant shape memory alloy (SMA)
- Reset time
- <1 minute
- Type
- Non-pyrotechnic, field-resettable
About
Sierra Space’s Hold Down Release Mechanism (HDRM) is a fast-acting separation nut rated to accommodate several working preloads. The HDRM series uses a conventional segmented separation nut with a redundant shape memory alloy (SMA) trigger that responds to a standard pyrotechnic firing pulse, enabling fast response times with low release shock.Integral circuit interrupts open trigger circuits upon release, simplifying ground operations and flight control requirements. The HDRM resets and is ready for bolt insertion in less than 1 minute using the supplied reset pin, allowing rapid re-set and re-test that saves significant time and cost.
Documentation
- LAUNCH-ADAPTERS-AND-SEPARATION-SYSTEMS-Hold-Down-Release-Mechanism-HDRM.pdf PDF source: www.sierraspace.com ↗
Need the full ICD, test reports or a specific revision? Ask the supplier directly.