Abstract: Networked initiation systems for hold-down and release mechanisms (HDRMs) are described. The systems include a control unit, a plurality of firing control units operably connected to and in communication with the control unit, wherein each firing control unit has at least one HDRM operably connected thereto, and wherein each firing control unit is individually addressable by the control unit over an interface bus to enable selective operation of the HDRMs operably connected to the firing control units.

Abstract: One aspect of the present disclosure involves a networked initiation system having one or more non-energetic hold-down and release mechanisms (“HDRMs”), a control unit and an interface bus connected between all of the HDRMs and the control unit. Other aspects of the present disclosure involve networked initiation systems having one or more of each of non-energetic HDRMs, energetic HDRMs and other (generic) energetic devices. The systems also include a control unit and an interface bus connected between all of the HDRMs and/or energetic devices and the control unit. The system may be used on a spacecraft for holding various elements in place on the spacecraft during launch, and then activating the HDRMs and/or energetic devices at selected points in time after launch to release the elements for movement, e.g., into orbit or beyond.

Abstract: Networked initiation systems for hold-down and release mechanisms (HDRMs) are described. The systems include a control unit, a plurality of firing control units operably connected to and in communication with the control unit, wherein each firing control unit has at least one HDRM operably connected thereto, and wherein each firing control unit is individually addressable by the control unit over an interface bus to enable selective operation of the HDRMs operably connected to the firing control units.

Abstract: One aspect of the present invention involves a hold-down and release mechanism (“HDRM”) that includes a hold-then-release mechanism configured to hold an element until the hold-then-release mechanism is commanded to release the element; and an integral sensor configured to sense an amount of a parameter of interest associated with the HDRM and to communicate the sensed amount of the parameter of interest to a receiving device. The parameter of interest comprises one of tensile preload, temperature, vibration, shock, and time from application of an HDRM firing current to HDRM release of the element.

Abstract: One aspect of the present invention involves a hold-down and release mechanism (“HDRM”) that includes a hold-then-release mechanism configured to hold an element until the hold-then-release mechanism is commanded to release the element; and an integral sensor configured to sense an amount of a parameter of interest associated with the HDRM and to communicate the sensed amount of the parameter of interest to a receiving device. The parameter of interest comprises one of tensile preload, temperature, vibration, shock, and time from application of an HDRM firing current to HDRM release of the element.

Abstract: One aspect of the present invention involves a networked initiation system having one or more non-energetic hold-down and release mechanisms (“HDRMs”), a control unit and an interface bus connected between all of the HDRMs and the control unit. Other aspects of the present invention involve networked initiation systems having one or more of each of non-energetic HDRMs, energetic HDRMs and other (generic) energetic devices. The systems also include a control unit and an interface bus connected between all of the HDRMs and/or energetic devices and the control unit. The system may be used on a spacecraft for holding various elements in place on the spacecraft during launch, and then activating the HDRMs and/or energetic devices at selected points in time after launch to release the elements for movement, e.g., into orbit or beyond.