BED FOR IMPACT TEST ( VARIANTS ) Russian patent published in 2003 - IPC

FIELD: rocket engineering, air-operated beds testing component parts of rocket engines for impact loads. SUBSTANCE: piston implemented in the form of hollow sleeve is placed tightly in guiding barrel and is located with open butt in high-pressure chamber. Piston-sleeve is linked to displaced nose of funnel via diaphragm and with guiding cylinder which interacts with largest diameter with immobile funnel of nozzle located on supporting element of high-pressure chamber. Braking unit comes in the form of mobile inert mass structurally joined to damper and mechanism catching piston-sleeve, for example, of harpoon type. According to another variant of implementation of bed, in addition to above-mentioned, damper is manufactured in the form of elastic inflated shell with fast-operating valve for pressure drop. In compliance with third variant of implementation of bed design of braking unit provides for mechanism catching pistonsleeve which includes ring comb anchored on piston-sleeve with teeth deformed in radial direction and uniaxial bushing with annular grooves put on inert mass. In agreement with fourth variant of bed cylindrical shell of piston-sleeve has profiled holes to regulate motion force or specified law of its change which ensure outflow of air through them with interaction of air with diaphragm which enables force to be altered to rise or fall. Usage of given invention makes it feasible to reconstruct flight loads of impact process of interaction of components with simulation of condition of automatic matching ( displaced nose and immobile funnel ) and design of telescopic nozzle. It is sufficient to secure installation of tested parts of nozzle in mix of bed embodied in the form of scale models which present weight, rigidity, materials and geometrical dimensions of elements of structure of nozzle for maximum approximation of impact process of connection of parts of nozzle to flight loads. Proposed design of bed makes it possible to execute fast videofilming of impact process of matching of displaced nose with funnel of telescopic nozzle with control over force moving displaced nose within wide range. EFFECT: improved functional efficiency of bed. 3 cl, 4 dwg