METHOD FOR CARRYING OUT QUALITY CONTROL OF ARTICLES MADE OF REINFORCED MATERIAL Russian patent published in 1995 - IPC

FIELD: quality control; medical engineering. SUBSTANCE: method involves preparing articles for being tested, creating sonic field by using sound pressure source, exciting elastic vibrations in a structure by means of the field, measuring structure vibration overloads with a point chopper in a preset range of frequencies in continuously changing frequencies, the chopper being mounted on the surface of the structure, building and then comparing amplitude- frequency characteristic parameters to be measured for standard and controlled articles. The standard and controlled articles are sequentially suspended on flexible bonds without touching sound pressure source and test bench. Vibration overloads and corresponding sound pressure are measured continuously varying frequency in a frequency range. Pressure applied to the sound pressure source is kept constant. Amplitude-frequency characteristic is built from sound pressure and vibration overload. Sound pressure amplitude-frequency characteristic corresponding to the standard article is used to detect the most long frequency range with the highest values of sound pressure. Then, a complex of mutually independent curve parameters relating both to standard and controlled articles is determined from vibration overload level, but on the amplitude-frequency characteristic. The parameters are compared and a decision concerning the technical condition of controlled articles is made based on unbalance of the parameter values. EFFECT: higher accuracy in determining deviation of parameters describing article technical condition from reference values. 6 dwg