DEVICE TO TEST ITEMS FOR VIBRATION STRENGTH Russian patent published in 1994 - IPC

FIELD: test equipment. SUBSTANCE: device to test items for vibration strength has programmable digital synthesizer of sinusoidal oscillations, a train of power amplifier and vibration table, digital-to-analog converter, reference voltage source, vibration converter, installed on the vibration table, feedback signal amplifier with input connected to vibration converter output, and reference voltage source output connected to digital-to-analog converter controlling input, the digital input of which is connected to digital synthesizer output. The device has two commutators, key, four diodes, two shapers, two differentiators, two inverters, pulse counter, trigger, two integrators, memory unit and peak detector. Digital-to-analog converter output is connected to the first commutator input, the first output of which is connected through the first integrator to the power amplifier input. The second input of the first integrator is connected through the key to the second output of the first commutator, which is connected through a train of the first diode in the forward direction, the first shaper, the first differentiator, and the second diode in the forward direction to counting input of pulse counter. Overflow output of the counter is connected to trigger S- input, the direct output of which is connected to controlling inputs of the key and memory unit. Trigger R- input is connected through a train of the third diode in the reverse direction and the second inverter to the first differentiator output. Key output is connected through a train of the second shaper, the second differentiator, the forth diode in the reverse direction, and the second inverter to "Zero setting" input of pulse counter. Feedback signal amplifier output is connected to the second commutator input. The first output of the commutator is connected to the first input of the second integrator. The second input of the second integrator is connected through a train of peak detector and memory unit to the second output of the second commutator. Controlling inputs of both commutators are connected to controlling input of the device. EFFECT: wider area of use. 1 dwg