Thermally Initiated Venting System (TIVS)

Safety is at the core of EBAD’s Thermally Initiated Venting System (TIVS) by initiating pyrotechnic material in a controlled, precise manner. EBAD’s TIVS is a passive (non-electrical) system composed of three subassemblies; Thermal Sensors (SCO & FCO), an Sensor Enabled Acceleration Disabled Mechanism (SEADM), and a Linear Shaped Charge (LSC). The segments of the TIVS are connected by mechanic means or a Flexible Confined Detonating Cord Assembly (FCDCA) if the LSC is located away from the Sensor Enabled Acceleration Disabled Mechanism (SEADM).

Principle of Operation

The TIVS senses either Fast Cook-Off (FCO) or Slow Cook-Off (SCO) thermal environments in the vicinity of the rocket motor. If a thermal event is detected, the Sensor will function, activating the TIVS system and a LSC cuts (vents) the rocket motor case preventing the motor from becoming propulsive and reducing the overall response to a Type V burning reaction.

The SCO and FCO Sensor is a non-electrically actuated autoignition device that functions at a pre-determined temperature based on the selection of components within the sensor. Once the initiator reaches the desired temperature the sensor triggers, rapidly increasing the temperature inside the sensor, and initiating the pyrotechnic material causing the device to function.

EBAD Sensor Enabled Acceleration Disabled Mechanism (SEADM) has two basic operational modes, Safe and Enabled, and Safe and Disabled. In the Safe and Enabled mode, the device is waiting for a thermal input at which time it will “automatically” arm and fire. The device has no discrete “arm” command. As a result, once the device is armed it will fire within a few milliseconds. The device will switch to the Safe and Disabled mode if an acceleration input of sufficient amplitude and duration is achieved. In the Safe and Disabled mode, the device will lock-out the explosive train.

Construction

FCO and SCO sensors have Stainless Steel bodies containing all critical components and provides a proper interface providing a pressure pathway from initiator to the SEADM. The SEADM is also Stainless Steel and provides containment during operation in the safe and disabled mode. A dual sensor SEADM connects to two sensors allowing the use of independent FCO and SCO sensors with the same SEADM.

Application

Thermally Initiated Venting Systems are used to score and or cut a rocket motor case to render the missile system Insensitive Munitions (IM) compliant when exposed to either a Fast Cook-Off or a Slow Cook-Off environment.

Key Features

• • Slow or Fast Cook-Off sensors available
  • Meets JOTP-50 safety requirements
  • Long life span
  • Multiple sensor ports
  • Cannot be duded by near slow cook off temperatures
  • Very low weight
  • MIL-STD-1901A compliant