CN105203253A - Multi-range pressure measuring segmentation collecting control method suitable for wind tunnel experiment - Google Patents

Abstract

The invention relates to a multi-range pressure measuring segmentation collecting control method suitable for a wind tunnel experiment. The multi-range pressure measuring segmentation collecting control method comprises the four steps of setting range switching values, controlling range changing, conducting measuring and automatically changing ranges. According to the multi-range pressure measuring segmentation collecting control method suitable for wind tunnel experiment, the problems that when a range sensor is used for measuring in the full wind speed range of a wind tunnel in the past, precision is low and low-speed precision cannot meet requirements are solved, meanwhile, the situation that ranges are frequently switched due to volatility of data collected by the sensor, and the accuracy of pressure measurement is improved.

Description

Be applicable to the multirange pressure survey piecewise acquisition control method in wind tunnel test

Technical field

The present invention relates to a kind of multirange pressure survey piecewise acquisition control method be applicable in wind tunnel test.

Background technology

The requirement of icing mnncl tcst section true airspeed is for being generally 20m/s-150m/s, general use differential pressure method is measured, namely use differential pressure pickup carries out the range task within the scope of gamut, but the measuring accuracy of this gamut measuring method is limited, and precision in low-speed range is very low, only very high precision can be reached in the scope of range more than 60%, make to need the pressure acquisition precision of the experiment carried out in low wind speed range greatly to reduce, directly affect the accuracy of whole process of the test measuring wind speed.

Summary of the invention

Based on the weak point of above-mentioned single pressure transducer measuring method, for head it off, a kind of multirange pressure survey piecewise acquisition control method be applicable in wind tunnel test is proposed, namely in low speed and high-speed range, use the differential pressure pick-up of different range to carry out measuring wind, to improve wind-tunnel measurements precision, for controlling the automatic range switching of tunnel pressure collecting device.

Realizing the technical scheme that the object of the invention takes is: a kind of multirange pressure survey piecewise acquisition control method be applicable in wind tunnel test, and method is as follows:

Step (1) adopts two pressure transducers without range, then two wind-speed gears are set, be respectively low or first gear and top gear, the pressure transducer that range ability is little is used during low or first gear, top gear uses the pressure transducer that range is large, determined the gear used by the opening and closing of the solenoid valve with small-range sensor series, definition low or first gear is solenoid valve off status, and top gear is solenoid valve open state;

Step (2), judge that whether the setup pressure value of current wind-tunnel is equal with preset range switching value, if two values are consistent, then maintaining valve door state is constant;

Step (3), two zone bit flag1 and flag2 are set, the judgement of range switching is carried out under the prerequisite that two values do not wait in step (2), if the value of flag1 and flag2 is unequal, show to need to carry out range switching, otherwise again judge from step (2);

Step (4), carried out range switch after, need zone bit flag1 and flag2 to be reset to 0 state, rejudge from step (2).

The multirange pressure survey piecewise acquisition control method being applicable to wind-tunnel provided by the invention, while solving the low problem of single range sensors measuring accuracy, avoid the generation of the frequent opening and closing situation of solenoid valve caused due to sensing data fluctuation, improve the precision of measurement.

Accompanying drawing explanation

Fig. 1 is the equipment connection schematic diagram of multirange pressure survey piecewise acquisition.

Fig. 2 is logical schematic of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the present invention will be further described.

Embodiment 1

As shown in Figure 1; closed electromagnetic valve in low-speed range; use the pressure data of small-range sensor 2 collection as test data; in high-speed range, solenoid valve is opened; to protect small-range sensor 2; prevent its outrange and damage, and the pressure data using sensors of large measurement range 1 to gather is as test data.

As shown in Figure 2, a kind of multirange pressure survey piecewise acquisition control method being applicable to wind-tunnel, comprises following step:

(1) initialization, valve closing, two mark amount flag1 and flag2 zero setting;

(2) it is consistent whether the pressure judging to test wind speed setting switches pressure with the range preset, if two values unanimously, keep original electromagnetic valve state constant, after return step (2);

(3), under the condition that two values are inconsistent in (2), the image data using sensors of large measurement range 1 to return, judges that its pressure switches pressure higher or lower than range;

(4) if gather pressure to switch pressure higher than range, then arranging flag2 is 0, then judges whether flag1 is 1, if 1 illustrates that in double judgement, pressure is all within the scope of top gear, need solenoid valve be opened, and reset flag1=0, return step (2); Otherwise put flag1=1, return step (2);

(5) if gather pressure to switch pressure lower than range, then arranging flag1 is 0, then judges whether flag2 is 1, if 1 illustrates that in double judgement, pressure is all in low gear range, need closed electrical magnet valve, and reset flag2=0, return step (2); Otherwise put flag2=1, return step (2).

The present embodiment changes and adopts single range sensors to gather the problem that in the low-speed range that causes of pressure, precision is low in the past, avoid the fluctuation of sensor image data causes algorithm to lose efficacy simultaneously, the frequent opening and closing of valve and range frequently switch, and improve the pressure acquisition precision within the scope of gamut.

Claims (1)

1. one kind is applicable to the multirange pressure survey piecewise acquisition control method in wind tunnel test, it is characterized in that, method is as follows: step (1) adopts two pressure transducers without range, then two wind-speed gears are set, be respectively low or first gear and top gear, the pressure transducer that range ability is little is used during low or first gear, top gear uses the pressure transducer that range is large, the gear used is determined by the opening and closing of the solenoid valve with small-range sensor series, definition low or first gear is solenoid valve off status, and top gear is solenoid valve open state;

Step (2), judge that whether the setup pressure value of current wind-tunnel is equal with preset range switching value, if two values are consistent, then maintaining valve door state is constant;

Step (3), two zone bit flag1 and flag2 are set, the judgement of range switching is carried out under the prerequisite that two values do not wait in step (2), if the value of flag1 and flag2 is unequal, show to need to carry out range switching, otherwise again judge from step (2);

Step (4), carried out range switch after, need zone bit flag1 and flag2 to be reset to 0 state, rejudge from step (2).