SU1073795A1 - Device for compensating vibroacoustic field - Google Patents

Description

The invention relates to means of controlling vibrations and noises and can be used to compensate (quenching) a vibro-acoustic field that occurs in mechanical structures and environments under the action of working sources of stationary oscillations, such as machines and mechanisms. A device for compensating vibrations in mechanical structures is known, comprising a series-connected oscillation receiver mounted on the structure, a filter and an emitter, as well as a reference receiver mounted in the compensation area T. The disadvantage of this device is the narrow frequency band, within which, it is possible to compensate for the vibrations of the structure. Closest to the invention of the technical essence and the achieved result is a device for compensating the vibroacoustic field,. containing a series-connected oscillation receiver, filter and emitter, as well as a control receiver installed in the compensation area 2. A disadvantage of the known device is the limited effectiveness of damping the sound field with changes in the signal spectrum, since there is no adaptation of the filter parameters to the signal parameters that change during device operation. The purpose of the invention is to increase the efficiency of compensation of the vibro-acoustic field. This goal is achieved by the fact that a device for compensation, a vibro-acoustic field containing, in turn, a connected oscillation receiver, a filter and an emitter, as well as a control receiver installed in the A-compensation area, connected in series with a control receiver by a series-connected power meter, a buffer, a buffer memory block, an output connected to the control input of the filter, and a calculator included between the output of the extreme regulator and the write input of the buffer block oh memory. In addition, the calculator is executed in the form of a Fourier transformer whose input is the input of the calculator, a logic block whose output is the output of the calculator, and a memory block of the transfer function of the feedback channel, and the outputs of the Fourier transform bodies and the buffer memory block are connected to the inputs block of logic. Figure 1 shows the block diagram of the device to compensate for the vibro-acoustic field; Fig.2 schematic calculator. The device consists of a series-connected oscillation receiver 1 installed on the structure 2, excited by mechanism 3, filter 4 and radiator 5, series-connected control receiver 6 installed in the blanking region, power meter 7, extreme regulator 8 and buffer memory block 9, the output of which is connected to the control input of the filter 4, as well as the calculator 10, the input of which is connected to the output of the extreme regulator 8, and the output to the recording input of the block 9 of the buffer memory. The calculator 10 consists of and, from the Fourier converter 11, the input of which is the input of the calculator, the memory block 12 of the transfer function of the feedback channel and the logic block 13, whose inputs are connected to the outputs of the Fourier converter 11 and the memory block 12, and logic is the output of the evaluator. The device works as follows. The signal of the oscillation receiver 1 is fed to the input of the filter 4 with the transfer function H.jC.jv;), which forms the excitation signal of the radiator 5. A non-recursive tunable filter can be used as the filter 4. The signal of the control receiver b is fed to the input of the power meter 7, the output signal Q, which is proportional to the average power of oscillations in the field of sound field compensation. The output control signals of the extremal regulator 8, to the input of which the signal a comes. are proportional to the discrete values of the impulse response of the filter 4 and changed in such a way that the signal C is reduced. The discrete values of the impulse response found are received at the input of the buffer memory block 9 and the calculator 10. If in a closed loop, oscillation receiver 1 is filter 4 emitter 5 is the feedback channel between radiator 5 and oscillation receiver 1 with transfer function i-.y (; stability conditions, for example; er :, (. - .-.. ГУ (:,} fc 1 with (.) - - -2 .i - О I are executed, then the calculator 10 generates at the input of the recording of block 9 memory pulse and discrete values of the filter impulse response found in the extreme controller 8; If the stability conditions are not met, the calculator 10 does not generate a pulse at the write input of the block 9 of the buffer memory, and the impulse response of filter 4 does not change. In calculator 10 discrete

the impulse response values of the filter 4 using the Fourier transducer 11 are converted into discrete values of the transfer function .lw) of the filter 4. Discrete values of the transfer function H (jw) and discrete values of the transfer function H2 (jw) of the feedback channel previously recorded in memory block 12 ti, are fed to the inputs of the logic block 13, in

which are checked the stability conditions of the system.

The use of the proposed device allows searching for the impulse response of the filter corresponding to the maximum compensation efficiency of the vibro-acoustic field while maintaining the stability of the system.

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Claims (2)

1. A DEVICE FOR COMPENSATION OF A VIBROACOUSTIC FIELD containing a vibration detector, a filter and an emitter connected in series, as well as a control receiver installed in the compensation area, characterized in that, in order to increase the compensation efficiency of the vibroacoustic field, it is equipped with a series receiver connected to the control receiver connected by a power meter, an extreme regulator, a buffer memory unit, an output connected to the control input of the filter, and a computer connected between you Odom extreme regulator and the input of the recording buffer memory block. 2. The device according to claim 1, characterized in that the calculator is made in the form of a Fourier converter, the input of which is the input of the calculator, a logic block whose output is the output of the calculator, and the memory block of the transfer function of the feedback channel, and the outputs of the converter Fourier and block buffer. The memory is connected to the inputs of the logic block.