DEVICE FOR AUTOMATIC CONTROL OF LOADING DURING PROGRAM ENDURANCE TESTS OF MECHANICAL STRUCTURES Russian patent published in 2009 - IPC G05B19/00 

FIELD: mechanical engineering.

SUBSTANCE: invention refers to the field of automatic control systems for testing machines and benches for endurance tests of mechanical structures. To solve defined task for each subgroup of local extrema (maxima and minima) including homonymous extrema of the same value, own accumulators of differences are used which provide correction of extrema for program control signal for each subgroup. Differences for each subgroup are accumulated until difference between feedback signal extremum and corresponding program signal extremum becomes equal to zero. To calculate true corrections correcting control signal extrema, the device has additionally included elements determining moments for calculating mentioned corrections and regulating order of information transmission between separate units of device. Such elements include service signals delays, service signal pulse width shapers, switches, registers containing updated from section to section of program information about extremum numbers and their ordinates, and memories successively storing after interpolation all intermediate points about currently generated program sections. To maintain constancy of average load rate, the device uses summing unit computing program section span, registers for temporary storing of this information and dividers dividing reference frequency depending on program section span value in such a way that constant average speed of each program section generation is provided independently from its span value change.

EFFECT: improvement of accuracy of loading for tested structures in the points of local extrema of testing program resulting in improvement of accuracy of products life time determination, as well as maintaining constant average loading rate for tested structures.

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