SU457000A2 - System for contactless determination of the oscillation amplitude of turbomachine blades - Google Patents

Description

my turbomachine); And 12 circuits, each of which generates a command for writing the state of the corresponding programmer to the subtracting counter 8 according to the signals of the waiting multivibrator 13, the output signal duration of which determines the recording time, and from the outputs of the P-discharge dir ring shift register 14, a sequential transition from stage to stage; button "record 15, designed to enter into the subtracting counter 8 of the number corresponding to the number of blades in the first stage of the turbomachine; An AND 16 scheme that generates a command for recording the number of blades of steps from the 2nd to the Pth by matching the signals, readiness of the subtracting counter 8 and the control sensor for synchronizing the recording time in counter 8 with the start of the recalculation of the blades, which eliminates the possibility of spurious measurements; the scheme “OR 17, collecting commands“ recording from the button 15 and the schemes “AND 16 for starting the multivibrator 13; the button “shift 18, designed to shift the register 14 to“ 1 for one button press, if necessary, to start research from any stage other than the first through the scheme “OR 19, also collecting a command from“ readiness of the subtracting counter 8; pulse shifter 20; shaper 21 pulse write; a digital printing device 22, registering sequentially for each stage and each blade, the number of the blade under test, the state of the counter 2, the number of measurements at the time of recording the result, the state of the adder 23 fixing the advance of the peripheral blade of the blade relative to its base, the state of the adder 24, fixing the lag of the peripheral part of the blade, and the number of the controlled step; and the indicator 25 of the number of controlled steps.

The digital printer generates the command "print end, which resets the counter 2 to the number of measurements and subtracts" --1 from the subtractive counter 8.

The system works as follows.

Before taking measurements, a number equal to the number of blades on the respective impeller is set on each of the programmers 11. The programmer of counter 2 sets the number of measurements for each blade. Pressing the button "Record 15 is carried out by entering the number from the programmer 11, corresponding to the number of blades in the first stage, to the subtractive counter 8 along the circuit: OR circuit 17 - Pending multivibrator 13 — AND circuit 12 - Programmer 11 -Circuit" OR 10 .

When turbomachine is in operation, after passing a single marker on the shaft past the control sensor, a pulse from the latter passes through the valve device 3 (this is facilitated by the condition of the trigger trigger 1),

The trigger 5 is set in such a state that the pulses from the blade recalculation sensor, which are sticking to the input of the valve device 4, pass to the input of the counter 7 of the number of blades. When the number of pulses in NDM becomes equal to that recorded in the subtractive counter 8, at the output of the equivalence 9 there appears a signal that the controlled blade is entering the measuring-zone. Measurements start from the last blade of a given stage. The number of measurements is recorded in the counter 2, and the result is memorized in the adders 23 and 24 of the advance and the lag, respectively. After the number of measurements of this paddle, given in counter 2, is taken, the latter overflows, which causes the appearance of a command signal to the digital printer - "start of printing. As a result, the states of the digital printer are fixed.

shift register 14 (step number), subtractive counter 8 (blade number), counter 2, the number of measurements and adders 23 and 24, in the memory of which the maximal values of the amplitudes of different characters recorded for the number of measurements recorded.

After the digitizing device records the results of the measurement of the last loop, a signal is generated at its output - the “print end”, which resets the counter

2 and subtract a unit from the subtracting counter 8. In this manner, a transition is made to the measurement of the next penultimate blade, etc. When all the blades of the first stage are monitored, the subtracting

counter 8 is in the zero state. Its output signal readiness goes to the OR 19 circuit to shift the register 14 (to prepare for monitoring the following stage) and to the coincidence circuit 16 to control the writing circuit in the subtracting counter 8. Similarly, all the stages of the turbomachine are monitored.

When the control of all blades of all stages of turbo-mashina is over, at the moment of

register 14 to its initial state, its output signal changes the state of start trigger 1 and the operation of the entire system is terminated.

Subject invention

System for contactless determination of the oscillation amplitude of turbomachine blades

on auth. St. No. 431414, characterized in that, in order to enable digital recording of oscillation amplitudes of blades of all stages, a subtracting counter connected to the other side is connected to the shift register with a stage indicator connected to the digitizer by means of a shift pulse generator and matching circuits connected to the driver

pulse recording.

Esh