SU1422043A1 - Device for testing article for random vibration - Google Patents

Abstract

The invention relates to a test technique and can be used in instrument engineering when tested for the effects of random vibration. The purpose of the invention is to increase the accuracy of imitation of operating vibration. A wideband signal is formed in the formation blocks, the adder, amplifier and vibrator transducer receive the product, signals are removed from the M points of the product and sent to N analysis units through preamplifiers. The specified energy spectra at the M points of the product are carried out at different frequency response of the vibration path within the N analyzed bands in the blocks of analysis. Each band is divided into M subbands in each block, where the band is determined that is most sensitive to changes in the vibration signal for any of the M control points of the product (analysis channel: analyzing filters - dispersion meters - adder. The comparison and control blocks generate the signal necessary for formation units to maintain a given energy spectrum about each test point of the test product. The delay circuit and the sync pulse generator are used to control the operation after setting the mode of the analyzing channels when the device is powered on. 1 s, p. f-ly, 1 d.a.

Description

The invention relates to a test-TigjibHOH technique and can be used in instrumentation when testing parts for the effects of random vibration.

The purpose of the invention is to improve the symmetry of operational ibration,

; The goal is achieved due to the fact that. By introducing additional channels of formation, analysis and control unit, the vibrational field is excited at the M points of the product with the difference in the amplitude-frequency characteristics of the specified control points

; The drawing shows a functional diagram of the device.

; The device contains N blocks for- mirovani, each of which consists of (M shaping channels, including a gum generator 1 connected in series, forming a filter; 2j level regulator 3 and series connected adder 4j whose inputs are connected to outputs M of level 3 regulators A combination of N formation units, power amplifier 5, the vibrator 6s whose output is connected to the tested product 1, are sequentially connected respectively to M vibration sensors Sj installed on the product 7, M preamplifiers 9s N blocks each of which consists of M identical analysis channels, each of which consists of M circuits of series-connected analyzing filter 10, the input of which is connected to the output of the corresponding preamplifier 9, the meter 11 of the dispersion and the adder 12; the inputs of which are connected to the outputs M of the meter 1 of the dispersion of the corresponding analysis channel, N comparison units, each of which consists of M comparison circuits 13, the first inputs of which are connected to the outputs of the corresponding adders 12 of the N analysis units, the M controller 14 levels of specified dispersion values, the outputs of which are connected respectively to the second inputs of the comparison circuit 13, 15 control units, each of which consists of M max-iyMa selection circuits 15, the inputs of which are connected to TV and ts TW inputs by dispersion meters 11 each of the M channels

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analysis, the switch 16, the first control inputs of which are connected to the outputs of the maximum selection circuit 15, the second information inputs are connected to the outputs of the comparison circuits 13 of the corresponding comparison unit, each of the M outputs of the switch 16 is connected to the control input of the corresponding level controller 3 the main unit of the formation, the delay circuit 17, the output of the clock generator 18 of the clock pulse, the input of which is connected to the output of the delay circuit 17 connected to the enable input of the switch 16, and the output with the synchronous inputs of all the circuits 15 selects the maximum of each of the N control units.

The device works as follows.

The signals from the outputs of the shaping channels are summed in adder 4 and the power amplifier 5 receives the vibrator -6 on which the device 7 is installed with the M vibration sensors 8, the signals from which through the preamplifier 9 arrive at the inputs M of identical analyzing groups, each of which overlaps in frequency, the corresponding frequency band of the analyzed frequencies, the signals from the outputs of the analyzing groups are summed in the M group adders 12 and fed to the first inputs of the corresponding M comparison schemes 13, the second inputs of which are fed signal from the output of regulator 14 y1) s "dispersions predetermined values. In this frequency band for a given control point, the error signal from the output of the comparison circuits 13 is fed to the second information inputs of the switch 16. To determine the most sensitive points in the corresponding sub-lines within the corresponding frequency bands, the signals from the M equal to the identical analyzing channels, input The analyzing channels into different groups of channels are fed to the inputs M of maximum selection circuits 15, from whose outputs the control signals are fed to the control inputs of the switch 16, which yuchaet error signals from respective outputs of circuits 13 to the inputs of comparing regulators layer 3 forming the respective N channels.

After turning on the power of the device, the time t, ad, is required to set up the analyzing channels, therefore the signal permitting the operation of the switches 16 is fed to the enable inputs of the switches 16 from the output of the delay circuit 17 with the delay C ad as the sensitivity of the control strips of this product in the corresponding - the bands do not change with time, the information at the control inputs of the switches is set only at the time t by the sync pulse from the output of the sync pulse shaping circuit 18, which is formed upon arrival olozhitelnogo level output from the delay circuit 17.

Claims (2)

1. A device for testing products for random vibration, containing N blocks of I-shaped fop, each of which consists of a series-connected noise generator, a shaping filter and a level controller, the series-connected adder whose inputs are connected to the outputs of the level regulators of the forming blocks, a power amplifier, a vibrator, the output of which is connected to the tested product, a vibration sensor, a preamplifier, N analysis units, N comparison units, characterized in that, in order to increase the simulation accuracy, vibration, it is provided with a clock generator and the force of the M-1 series-connected vibration sensor and preamplifier, each analysis unit Completed in the form of M analysis channels, each of which consists of an adder and M circuits, an analyzing filter connected in series, the input of which is connected to the output of the corresponding preamplifier, and a dispersion meter, the outputs of each circuit are connected to the inputs of cyi-iMaTOpa, 0 comparison blocks are made in the form of M comparison circuits, the first inputs of which are connected to the outputs of the corresponding adders of the analysis channels, M controllers of the set values level 5 dispersions, the outputs of which are connected respectively to the second inputs of the comparison circuit, N control units 5, each of which consists of M schemes for selecting the maximum dispersions of each of 0 M analysis channels, and. the switch, the control inputs of which are connected to the outputs of the maximum selection circuit, the information inputs are connected to the outputs of the comparison circuits of the corresponding comparison unit, each output of the switch is connected to the control input of the corresponding level controller, the sync pulse generation output is connected to the synchronous inputs of all the maximum selection schemes of each control unit. 2. The device according to claim 1, which includes a delay circuit, the output of which is connected to the input of the clock generator and the enable input of the switch of each control unit. forming unit 1 Editor A. Shandor Compiled by B. Mamontov Tehred M.Morgental Proofreader M.Demchik Order 4418/39 Circulation 847 BNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raz vice nab. 4/5 Subscription