Mel’nick V.N.

National Technical University of Ukraine “KPI”

INFLUENCE OF ULTRASONIC WAVES ON THE GYRO’S GIMBAL

We will take into consideration eight values of the turning angle of the ДУСУ body relative about its longitudinal axis, i.e. every starting with conditional zero (denoted by). When the gyromotor power is off we mark "zero shift" on the diagrams of the output signal of the angle rate sensor by a thin line. A thick line marks the output signal when the gyromotor power is on (Fig. 1, Fig. 2). The first five - seven seconds and last five- seven seconds of implementations can be excluded because it is time for a nominal mode of the gyro radiator and a stoptime, respectively. The device and the radiator operate in a non-stationary mode.

The gyrodevice is “off”. As it can be seen, the output signal of the angle rate sensor in the ultrasound beam undergoes stochastic changes at the value and the sign. The value of "zero shift" can grow to (in terms of angle rate). At the "zero shift" is practically missed, more exactly, it is below the sensitive threshold of the sensor.

Minor changes in sign in the output signal occur in (Fig. 1). Instead, when , they do not only range in sign, but have a substantial range in the amplitude. If the angle , the range of values is greater than , but always an unchanged sign.

Obviously, the existing "zero shift" in the ultrasonic ДУСУ sensor rays when the gyromotor is off is determined the integral reaction of the gyroscope gimbal components. First of all, it concerns the current-collectors of the potentiometer, which look like a console.

Not the least part play the nonlinear oscillations of the "float" surface as well as emerging caustic areas which are results of resonance phenomena of wave coincidence.

The gyrodevice is “on”. Of course, under these conditions serious changes of the output signal of the device will take place due to a gyroscopic reaction. If , the device error is being increased almost in ten times and changes its sign (Fig. 1). The maximum value of it reaches. The average value equals .

Fig. 1. The ДУСУ output signal at _;a thin line – the gyrodevice is “off” ; a thick line – the gyrodevice is “on”

If , the average error and its maximum value is slightly decreased in magnitude, but changes its sign for the opposite (Fig. 2):

, .

A turn of the ДУСУ body at the angle allows stabilize the error of the device in time at the level .

A turn of the ДУСУ body at the angle allows reduce the average error to the value. . However, the range of values will be. In addition a superposition of short-period and long-period components take place.

If the angle , the ДУСУ output signal has a minimal variation in amplitude, and the average error does not exceed .

A turn of the ДУСУ body at the angle practically does not change the situation. The same concerns the numerical values.

At the turning angles and the diagram of the error is not changed. The average value also won’t be changed.

and remains stable over time. At the same time a slight range appears. Thus, the angular orientation of the ДУСУ body at values ,, and practically have no effect on the diagram of the device’s error over time.

t, s

Fig. 2. The ДУСУ output signal at : a thin line – the gyrodevice is “off”; a thick line – the gyrodevice is “on”