Apparatus and method for controlling a resonant testing machine

摘要: A machine for testing the strength of material specimens by applying a mean and cyclical load thereto includes hydraulic actuator connected to specimen, servo valve controlling flow fluid from sensor specimen. The is controlled train pulses directed its actuating coil. use as forcing function allows system attain higher operating efficiency. feedback signal utilized correct repetition rate resonant frequency specimen under test and, after attained, maintain at frequency. are area supply more or less energy required in resonance desired load. on also maintained selected value. may be used standard, non-resonant changing position few switches.