SU861965A1 - Multi-poit device for registering vibration parameters - Google Patents

Description

  . - 1 The invention relates to a vibratory measurement technique. The closest to the invention according to the technical essence and the achieved result is a multipoint device for recording vibration parameters, containing a group of vibration sensors associated with the research, objects, a signal generation circuit, including a group of preamplifiers connected respectively to the outputs of the vibration sensors, switch block, the inputs of which are electrically connected to the corresponding outputs of the preamplifiers, the integrator, a two-input switch, connected by one input to the output of the switch unit, the other - to the integrator's output, and a delay unit, a clock generator connected to the input of the delay unit and a control input of the switch unit, and a recording circuit including a serially connected one-vibrator two-input inhibit unit, the second input of which is connected to the output of the two-input switch, and a recording unit l. The disadvantage of the device lies in the fact that at the moments of interference the recorder cannot register useful signals, and this leads to an increase in the time of registration. The aim of the invention is to reduce the registration time. The goal is achieved in that the device is equipped with an additional group of vibration sensors, a signal generation circuit, two two-input triggers with pairwise connected inputs connected between the output of the delay unit and an integrator input, respectively, one to the main and additional signal conditioning circuits, and a two-input OR circuit connected between the input one-shot recording circuit and the first and second inputs of additional triggers, and the clock pulse generator has a second input connected to the input of the grain block An additional signal conditioning circuit. FIG. 1 shows a block diagram of a multipoint device for registering vibration parameters; FIG. 2 - voltage diagrams at the outputs of the blocks. A multipoint device for registering vibration parameters contains a group of vibration sensors 1 connected to the objects under study, a signal circuit 4) OVAN signal including a group of preamplifiers 2 connected respectively to the outputs of vibration sensors 1, a switch unit 3 whose inputs are electrically connected to the corresponding outputs preamplifiers, integrator 4, two-input switch 5, connected by one input to the output of switch unit 3, other. to the output of the integrator, and delay unit 6, generator of 7 clock pulses, connected to the input of the delay unit and the control input of the switch unit, and the registration circuit, including one-shot 8 connected in series, a two-input prohibition block 9, the second input of which is connected to the output of the two-input switch, the registration block 10, an additional group of vibration sensors 11, a signal conditioning circuit including a group of preamplifiers 12, switch unit 13, integrator 14, two-input switch 15 and delay unit 16, two two-input triggers 17 and 18 with pair-wisely connected inputs connected between the output of the delay unit and the input of integration tori, respectively, one by one into the main and additional signal conditioning circuits, and the two-input circuit 19 OR connected between the input of the one-vibrator of the detection circuit and the first and second inputs of additional triggers, and the clock generator has a second input connected ifio to the input of the delay block of the additional signal shaping circuit .

The device works as follows.

Switch units 3 and 13 are controlled by pulses from equal outputs of a generator of 7 clock pulses, producing two sequences of impulses shifted one relative to the other by half of their follow-up period (see Figures a, b, Fig. 2). In the initial state, all vibration sensors with preamplifiers are disconnected, and keys 5 and 15 are closed with signals from the outputs of the flip-flops 17 and 18. Send the first pulse from the sequence (see plot a, figure 2) to the vibration sensor 1 through the preamplifier 2 and the switch unit 3 is connected to the input of the key 5. When the time expires, equal to the sum of the bounce times and transients, and 1 pulse from the output of the delay block 6 (see diagram in figure 2), the trigger 17 is set to allow the passage useful signal vibrodatchky k.lyu 5 (see the eshora g, figure 2). Upon receipt of the pulse from the sequence (see plot b, figure 2) the useful signal from the vibration sensor 11 through the preamplifier 12 and

the switch unit 13 is fed to the input of the key 15, which is closed by the alarm; from the output of the trigger 18. Before the termination of the bounce and transients in the vibration sensor 11 - preamplifier 12, the switch unit 13 to the input of the detection circuit remains connected to the useful signal from the vibration sensor 1. when ATj has elapsed, the pulse from the output of delay unit 16 (cw. plot d, fig. 2) flip-flop 18 is set to the state allowing the passage of the useful signal through the switch 15 (see e, fig. 2), and flip-flop 17 returns to initial state. The device remains in this state until the next pulse and the sequence (ohm. A, Fig. 2) /,:,:

Upon receipt of the last cr to the input of the private key 5 through the pre-amplifier 2 and block 3 of the co.1 mutator, the following is connected: vibration sensor: 1 and the cycle repeats.

In order to separate the information of neighboring sensors, a device 19 is introduced into the device, whose inputs are connected to the outputs of blocks b and 1-6 delays. From the output of circuit 19, OR, the signal is fed to the input of a one-shot 8, which produces an impulse of duration T (see plot g, Fig. 2). With this impulse, the prohibition block 9 is closed for the duration of its duration, as a result between the frames of information recorded from the neighboring: x; sensors, there appears a split with a zero level from the alt (see the plot for, figure 2),

The voltage plots at the outputs of block 3 and 13 of the switch are depicted in FIG. 2, 3, and, the type of registration and information in FIG. 2, k.

The use of the described device makes it possible to shorten the time for polling all vibration sensors and, consequently, the vibration tests of an item H.J, a value equal to the sum of times dTc in the chains of all vibration sensors. Increased: 1 reading of the recording density due to elimination of the carrier blank during the action of interference will allow 3 times to reduce the consumption of media per unit of useful information.

Claims (1)

1. USSR author's certificate 437076, cl. G 01 M 7/00, 5 G 01 N 1/04 (rubbed). 0ffi.f ffg.l