SU470794A1 - Device for determining static characteristic of saturation nonlinearity - Google Patents

Description

connected to the inverse of the zero-body.

Such a device allows automatically and with high accuracy to determine the parameters of a piecewise linear approximation of a real nonlinear element such as "saturation in the mode of its normal excluatacin, solve the parametric identity problem and the linear and nonlinear part of the system and the parametric control problem when the system parameters are unsteady.

The block diagram of the device shown in the drawing.

It contains a nonlinearity model 1, a sensitivity model 2, an amplifier 3 with controlled gain, a polarized relay 4 with a controlled output signal level, a zero-organ 5, a switch 6, keys 7 and 8, parameter setting block 9, a polarized relay 10 with a single output, nonlinearity of tin saturation 11 and subtraction circuit 12.

The device works as follows.

Before switching on the device at amplifier 3 with controlled gain 3 and polarized relay 4 with controlled output level, arbitrary gain values and output level are set, which corresponds to piecewise linear modeling of the studied nonlinearity with arbitrary parameters (gain coefficient of the linear part, level saturation). When the device is started up, the parameters of an arbitrarily given initial characteristic of the nonlinearity model are changed until the model corresponds to the real nonlinearity from the point of view of the minimum of the mean square of the approximation error.

There are two characteristic modes of operation of the device: the mode in the linear zone of the approximating model and the mode in the saturation zone of nonlinearity.

When in the linear zone of the approximating model, the value of the output signal of the amplifier with controllable gain 3 is less than the value of the output signal of the polarization relay 4. In the inverse output of the zero-organ 5 in this case there is a potential leading to the operation of the key 8, which leads to opening the output circuit of a polarized relay 10 with a single output, and the absence of a signal at the main output of the zero-body leads to the operation of switch 6 and key 7. Switch 6 in this mode connects the output of amplifier 3 to the input the subtraction circuit 12, and the key 7 - the nonlinearity input to the input of the parameter setting unit 9, which changes the gain of the amplifier 3 until the system enters the second mode.

In the second mode, the value of the output signal module of amplifier 3 is less than the value of the output signal module of polarized relay 4, which triggers the zero-organ 5. In this case, switch 6 and keys 7 and 8 operate in the reverse order; switch 6 connects the output of the polarized relay to the input of subtraction circuit 12,

the key 7 opens the direct circuit of the sensitivity model, the key 8 connects the output of the polarized relay 10 to the input of the parameter setting unit 9, which changes the output level of the polarized relay 4 until

In the scheme, the next transition to the linear mode will not come. In the setup mode of controlled parameters of model nonlinearity 1, the signals of the differential motion of the model and

the object n is the signal of the sensitivity function in terms of the amplification coefficient from the output of the sensitivity model, as well as the signal of the difference motion of the model and the object and the signal of the sensitivity function in terms of the saturation level.

In parameter setting block 9, the signals are multiplied in pairs for each channel and integrated.

The cyclical process of adjusting the parameters of the nonlinearity model 1 is considered complete when the difference between the output signals of the real nonlinearity type "saturation 11 and the nonlinearity model 1 is minimal. After completion of the tuning process (only a few seconds long), the gain value of amplifier 3 with a controlled factor corresponds to the gain of the linear part of the optimal approximate static characteristic, and the output level of the polarized relay 4 is

the saturation level of the static characteristic.

Subject invention

A device for determining the static nonlinearity characteristic of the "saturation" type, containing a parameter setting unit n a subtraction circuit, one input of which is connected to the nonlinearity output and the output

To the input of the parameter setting unit, which differs from 1 to 1, in order to increase accuracy and increase the speed of the device, it contains an amplifier with a controlled gain (}) of gain gain and a polarized relay with

a controllable output level, the inputs of which are connected to the nonlinearity input, a zero-organ and a non-switch, the first inputs of which are connected to the amplifier output with controllable gain, the second inputs are connected to the output of a polarized relay with a controllable output level, with another input of the subtraction circuit, a polarized relay with a single output and two keys, the inputs of the first and

polarized relays with a single output are connected to the nonlinearity input, the output of a polarized relay with a single output is connected to the input of the second key, the outputs of the keys are connected to the corresponding inputs

a parameter setting unit whose outputs are connected to the control inputs of the amplifier with controllable gain and a polarized relay with a controllable output level, the control input of the first switch connected to the forward zero-organ output and the control input of the switch The second input of the second key is connected to the inverse output of the null organ.