SU150301A1 - Multicomponent aerodynamic scales with computing device - Google Patents

Description

Known multi-component aerodynamic scales with a real-time computing device do not provide for printing the exact values of aerodynamic coefficients, since the forces and moments obtained on the scales must be divided into the model parameters and the speed and time, corrections for the blocking effect should be introduced pipes, flow boundaries, suspension or holder effects, and also the mutual influence between the individual components of the balance.

In the proposed scales, reliable reception of information, taking into account the sign from sensors placed directly in the wind tunnel, is achieved by the fact that the sensors with the aid of selsins are connected to a sector disk that enters the gap between the backlight unit and the block of two offset photodiodes, the output of which is connected through a logic circuit with a reversible counter.

FIG. 1 shows a block diagram of the described multi-component aerodynamic weights; in fig. 2 - construction of selsi} w-receiver.

A real-time computing machine that serves to block a wind tunnel contains a communication device with an object, an arithmetic device, a random access memory, and a control device and a printing device. A communication device with an object, intended to introduce variable values of a protocol into the machine, control various processing modes interlocked with the measuring elements of the pipe and its control system, consists of: a shaft-number converter unit including a sensor system / -i, - connected with the weight elements of the pipe and converting the amount

 150301-2 shaft turns into a series of shifted pulses, W-IS logic circuits, accumulating reversing counters 19-27 connected to a switch 28 with a local control unit 25, and a block of weights range coefficients for inputting machine numbers depending on the weight range number an item.

A drive 30 is inserted on the selsyn-receiver shaft connected to the weight element. The disk 30 is inserted into the gap between the backlight unit 5 / and the block 32 of two shifted photodiodes, the output of which is connected via a reversible counter through a logic circuit. The disk 30 is provided with ten slots. When the disk 30 rotates as information passes through one channel, the photodiodes emit pulses that are out of phase. The phase shift determines the direction of rotation, and the number of shifted im- pulses is the tenth part of a revolution. The shifted pulses are fed to the input of a logic circuit that determines the direction of rotation of the disk 30 and generates signals for the unit with its sign to the input of the reversible counter. A reverse binary counter, depending on the sign of the unit, adds or subtracts it from the numbers contained in it. On a reversible counter, a number is generated in the binary code corresponding to the number of tenths of a turn of the weight element shaft. Entering into the machine a number characterizing the price of the turnover of the weight element, calculate the force acting on the weight element. The weight range block is a one-way drive. Range coefficients are encoded in a diode number matrix 33, made on interchangeable cells to change coefficients when using different types of aerodynamic weights. The interrogation of numbers and their transfer to the arithmetic unit is carried out by the switch 34, controlled, on the one hand, by signals of changing the ranges of the weight elements, and on the other, by a special program command.

The arithmetic unit, made on the parallel-sequential principle, contains a register block 35, an adder block 36 and a shifter block 37. It performs operations on numbers in the binary number system — on addition, subtraction, special subtraction, multiplication, and a number of logical operations (selection of numbers, mark formation, sending the number to the operational print memory and sampling of range coefficients). The division is made according to the program. In order to increase the accuracy of the result and facilitate scaling, the device is equipped with a multiplication command with a simultaneous shift of the product by two bits to the left, and to maintain the linearity of the program, a special subtraction command is introduced, which, in addition to the subtraction operation, modifies the address of this command. All operations are performed in a single cycle of operation of the machine, and their results are recorded by the adder 36.

A random access memory consists of a magnetic drum 38 for storing a numerical material and a series, magnetic heads 39-44 for recording and reproducing a numerical material and series on a magnetic drum, a switch 45 for serving heads for switching magnetic heads, playback unit 46, intended for issuing a number to an arithmetic unit at a given address and issuing a series of control pulses, a block 47 for recording a numerical material on a magnetic drum, and a block 48 of a number address to generate signals that control the recording and playback of numbers.

The operation of the maschion devices is synchronized using two series (C and C) recorded on the magnetic drum 38 and

reproduced by magnetic heads 44 and 43. Seri C is used to generate control pulses during recording and playback by recalculating it with a six-bit counter in block 48 of the number address. At the same time, the high-order counter of the counter twenty-one times generates pulses corresponding to the address of five lower-order bits of the address code. Thus, the recording and reading of twenty-one-digit numbers is performed by a sequence of thirty-two C series pulses. Increasing the capacity of the operative memory device can be accomplished by increasing the number of magnetic heads and the density of recording on the magnetic drum.

A control device to ensure the coordinated interaction of all the nodes of the machine, is associated with the body of the control of the wind tunnel and automatically monitors the progress of the experiment. It consists of a program block 49 for storing on a punched tape and issuing a single point of the protocol to the program, as well as for entering the necessary numerical material into the operational memory, block 50 for generating working pulses and a series of pulses ensuring the operation of all devices of the machine, synchronization block 51 that extracts the working turn of the magnetic drum, the synchronous cycle of the program block, the command decoder block 52, which serves to convert the operation number code into an operation signal and generate a control complex their signal, s for the arithmetic unit, group operation unit 53, controlling the census of numbers from the tape to the random access memory, start / stop unit 54, starting and stopping the machine, initial resetting the machine and entering the commands and numbers from the manual control panel, block 55 of the counter intended for modifying the address when entering zero readings into the operational memory and executing the subtraction command, zero 56 of the manual control and automatic control block 57 providing the operation machines with an aerodynamic experiment and performing the functions of an automatic operator.

The automatic control unit 57 is connected to the pipe control devices and receives signals from them about the readiness to conduct the experiment, start the flow, start the dispenser program 58, balance the scales 59,, c of the dispenser program, the origin (a O, | 3 0) and the nature of experiment (at angles a or p angles). The balance 59 is connected to the model 60 and the conversion unit 61, which is connected to the sensors / -9 by means of the communication elements 62, 63, 64.

The printing device is designed to automatically convert numbers from a decimal-binary number system to a decimal and print them onto paper tape in the form of columns of numbers with letter designation of each value. It consists of a block 65 of a push-type printing mechanism, a block 66 of local control of print signals and a block 67 of mass channels.

The printing device receives the results of the calculations from the arithmetic unit of the machine in a decimal-binary code. The encoded number is sent from the control device of the machine to the register registers of the device's print, where it is fixed before decoding by the cam decoder into the decimal code. By a special command from the machine, numbers are deciphered and outputted by means of a block 65 printing mechanism onto a paper tape. For the period of one print, two calculated aerodynamic coefficients are recorded, unrolled on one line. In addition to printing n piznachno- 3 -L 150301

Ho 150301 is the 4th and their letter designation, the sequence number of the protocol point is also printed. The proposed device makes it possible to process a protocol point for six seconds.

The computational process of processing aerodynamic points; The experiment is as follows. The aerodynamic constants and parameters of the pipe and models are converted to binary number and are scaled. Before the start of the experiment, the resulting numerical material is inserted into the random access memory. After checking the correctness of the input, the number tape is removed, a program tape is inserted into block 49 of the program and then the machine is transmitted to the wind tunnel controllers. At the first stage of the experiment, zero readings of the counter 55 in the absence of flow are taken. .ManjH; ia is automatically translated into a mode in which the readings of the weight element corresponding to the specified angles a or P are recorded in consecutive cells of a random access memory with an automatically changing address. At the second stage of the experiment, the flow is switched on and the model again passes through the test angles a and p given by the Program. The machine automatically goes to the operation mode, which provides processing of protocol points according to the standard program. At each count, readings of all weight elements converted to binary code are recorded in specific random access memory cells. At the same time, a tape mechanism starts, which drives the tape with the program. To, the moment of the recording of the last weighing element for the reading brushes, the first command of the program is suitable, and the machine begins to process the removed raw data with simultaneous printing of the results on the printing device. The processing of both a and | 3 data is carried out according to a single program. Since in the experimental process the ranges of the weight elements of the aerodynamic weights vary, the device includes a block 68 of the weights range sensors, which is associated with the matrix 33.

Subject invention

Multicomponent aerodynamic scales with a real-time computing device, characterized in that, in order to reliably obtain information taking into account the sign from the sensors located directly in the aerodynamic rack, the sensors are connected with a sector disk entering the gap between the backlight unit and the block of two offset photodiodes, the output of which is connected through a logic circuit with a reversive counter.