MODAL ANALYSIS SYSTEMS
Pyrotechnical thrustor PL 81
vibratory analysis of aircraft structures , carried out by means of impulse excitation
applied through thrustors , offers positive advantages compared with other processes :
The PL 81 thrustor is a new model of simple design and of reliable and reproductible operation, allowing the synchronization of several thrustors controlled simultaneously.
It is composed of a rectangular bar made of a block of hollowed-out aluminium , equipped at one end with the firing relay (black powder plus firing tube) , and at the other end with the ejection nozzle for the gases , mounted perpendicular to the top face , including its security device.
The principal charge consists of propergol strips whose lenght and thickness are calculated to suit the desired force and combustion time.
The thrust time curve is similar to a "square wave" impulse.
The PL 81 thrustor meets the standard operating specifications and the particular ambient conditions for in-flight tests (temperature vibration , shock , pressure , etc...).