SU148852A1 - Strainer - Google Patents

Description

In known strain gauging devices, the processing of strain gauge results is done manually. The averaging of the experimentally obtained points is carried out approximately by drawing a straight line passing the closest to all the given points.

The present invention is equipped with a rewinding and lateral movement of a punched tape at the end of the measurement cycle at each load step and an electromechanical determining device.

The presence of these mechanisms makes it possible to arrange the readings of each sensor at different loading steps in one frame and ensures the subsequent automatic averaging of the measurement results by the least squares method.

FIG. 1 shows a block diagram of the device; in fig. 2 - converter.

The device consists of the following blocks: a point-to-point switch STN-100; electronic strain gauge EID-3 with MPC converter; perforator YAR; the processing unit of the results of tensometry according to the least squares BO method; the printing device, consisting of two blocks PU and PF type "Ural.

The present installation implements: connecting strain gauges to an electronic strain gauge using an automatical switch, recording meter readings onto a film in a binary code, processing the least squares of experimental data recorded on a film; digital print processing results representing the relative deformation values E of each sensor.

The STP-100 point switch is a step-up detector and provides a serial connection of one strain gauge no. 148852-2-ticks to the 5YaD-3 electronic strain gauge, which is an automatic self-balancing bridge with a minimum relay operating at the moment of a balanced bridge and by the converter of the binary MPC code, the indicator of the electronic strain gauge is a three-digit decimal number. The output shaft of the electronic strain gauge is connected to the input shaft of the converter. On the surface of the main disk / converter in the binary system, using seven binary bits, numbers from 0 to 99 are written. With the help of the converter, the first two bits of a three-digit number — the instrument readings — are converted into binary code. The third digit of the number — hundreds — is converted into a binary code with the aid of an EO additional disk 2, which receives a certain angular displacement through the mechanism of the Maltese cross 3 and a pinion 4 N 5 1: 3. every full turn of a converter disc. The additional disk 2 has four binary bits necessary for recording in the binary system decimal numbers from O to 9. Thus, the conversion of a three-digit decimal display of an electronic strain gauge into a binary code with a separate system for translating the first two digits-units and tens. and a range of hundreds is performed using eleven bits. The transducer readings are taken using eleven brushes 6 which are pressed against the surface of the disks at the moment of a balanced bridge condition. With the aid of the YAR perforator, the recordings of the indications of the electronic strain gauge EID-3 in a binary code on a tape (such as a film) are carried out by perforation. After each measurement and recording of the electronic strain gauge on the tape, the perforator draws the tape one step / 47.5 mm.

During the transition to the next load step, the following operations are performed. The tape is pulled in the opposite direction with the help of a special mechanism until the frame of the first strain gauge is under the punches of the perforator. The tape is shifted in the transverse direction to form the next line of the frame.

As a result of the tensometry of an object for a hundred strain gauges on a mite, one hundred frames appear, each of which contains a number of numbers representing the same strain gauge for a load of load steps.

The operation of the first three blocks of the installation is controlled by a cam program mechanism, which determines the sequence of operation of the individual elements of the blocks. In processing unit 50, averaging is performed according to the method of smallest squares of experimental data recorded on a tape. The experimentally produced tape is fed to a processing unit. The tape mechanism sequentially shifts the tape by frame. Each frame is read by a contact matrix, the readings of which are fed to an electromechanical device, which produces the experimentally obtained points at the instrument scale and averages them according to the method of the unit of smaller squares.

In addition to averaging the experimental points by the least squares method, in the processing unit n), the calculation of the relative deformation E of each sensor is performed using a special tangent mechanism. The output of the CW processing unit is interfaced with external devices of the Ural - With a PU printing device - for digital printing of processing results, with a NF perforator for printing the relative deformation values E of each sensor as digital material for further calculations on the electronic digital tool of the type " Ural

Subject invention

A strain gauge device containing a step switch, an electronic recorder of measured strains in binary code on a punched tape, and a measurement results processing unit with a digital printing mechanism, characterized in that, in order to ensure automatic measurement of the least squares results, it is equipped with a rewind mechanism and transverse displacement by one line of a punched tape at the end of a measurement cycle at each step of loading and by an electromechanical determination device .

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