JPH0920296A - Trailing cone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit pressure measurement by means of an electric signal and to perform rapid and accurate measurement, in a trailing cone for measuring the position error of the pressure altitude system of an aircraft. SOLUTION: A trailing cone 1 is tagged through a tagging rope 4 from an aircraft 7. A wind pressure sensor 2 is embedded in the tagging rope 4, a cable 3 through which a detecting signal is transmitted is arranged along the tagging cable 4 and connected to an amplifier 5 in the aircraft 7, and indicated by an indicator 6. Since a pressure signal in an uniform flow is directly guided by means of an electric signal compared with a conventional case wherein a pressure signal is directly guided, a rapid and accurate position error is measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailing cone (bomb) applied to aircraft flight test measurement.

[0002]

2. Description of the Related Art PE in conventional aircraft flight tests
As shown in FIG. 4, the trailing cone used for measuring (Position Error) pulls the towing pipe 12 from the prototype aircraft 10 which is to measure the static pressure of the uniform flow, thereby towing the cone 11 to pull the pipe 12. Is stabilized in a uniform flow, and B
As shown in FIG. 5 of the details of the section, a uniform flow static pressure was introduced into the aircraft 10 through a static pressure detection hole 13 formed at the end of the tow pipe 12, and this was measured by an altimeter or the like.

[0003]

According to the prior art, FIG.
As shown in (4), since the towing pipe 12 that pulls the uniform flow from the airframe is long, it takes a long time to give a signal detected from the static pressure detection hole 13 at the end to the indicator in the aircraft 10, and a delay during that time. was there. In addition, since the signal directly measures atmospheric pressure and transmits it, a large noise is generated even in the subtle turbulence of the air flow, and it is not possible to distinguish the actual air flow from the noise, which causes an error.

In order to solve the above problems, the present invention aims to adopt a method of wind pressure detection by an electric signal so that the wind pressure can be transmitted by an electric signal having a fast signal transmission instead of the conventional pressure transmission. I am trying.

[0005]

Therefore, the present invention provides a trailing for towing a cone from an aircraft, measuring wind pressure in the vicinity of the cone and guiding the wind pressure into the aircraft, and measuring a position error of a barometric altitude system. In the cone, a tow line for towing the cone, embedded in the tow line, a wind pressure sensor for measuring wind pressure near the cone, and a wire along the tow line, the electric signal from the wind pressure sensor And a cable for transmitting to an indicating instrument in an aircraft.

According to such a trailing cone,
A wind pressure sensor is embedded on the surface of the towline that tows the cone so that the surface does not generate turbulence of the air flow, and this converts the wind pressure detected in a uniform flow into an electrical signal. This electric signal is immediately introduced into the aircraft by a cable that runs through the towline, and the signal is given to the indicator without delay. When there is turbulence in the air flow, the needles and the like generate vibrations, so that the turbulence in the air flow can be recognized. In this way, the uniform flow static pressure can be known quickly and without error, and the position error in the barometric altitude system of the prototype aircraft can be accurately measured.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a trailing cone according to an embodiment of the present invention, and FIG. 2 is a detailed view of part A thereof. In these figures, 1 is a trailing cone, 2 is a wind pressure sensor, 3 is a cable for transmitting a detection signal of the wind pressure sensor 2, 4 is a tow line for connecting the trailing cone 1 and towing, and the wind pressure sensor 2
Is attached, and the cable 3 for transmitting the electric signal is also wired along the inside thereof. The sensor 2 is embedded in the surface of the towline 4 so that the turbulence of the air flow does not occur on the surface. 5 is an amplifier, 6 is an indicator, and the wind pressure sensor 2
The signal from is amplified by the amplifier 5 and transmitted to the indicator 6.

FIG. 3 is a block diagram showing the signal system of the trailing cone of the present invention. The detection signal from the wind pressure sensor 2 is guided to the amplifier 5 by the cable 3 and to the indicator 6 to rotate its needle. Let

In an embodiment having such a structure, FIG. 1 shows a state in which the trailing cone 1 is towed from an aircraft 7, and an attempt is made to measure a static pressure position error of an advanced system such as a prototype aircraft. In this case, the wind pressure sensor 2 is pulled out by a cone 1 or a bomb connected to the towline 4 to start a uniform flow, and a static pressure is detected by a sensor 2 attached thereto.

In FIG. 3, the signal detected by the wind pressure sensor 2 becomes an electric signal and is transmitted through the cable 3 to the aircraft 7
It is amplified by the amplifier 5 installed inside, and the pointer of the indicator 6 is rotated to a level commensurate with the signal, and the static pressure level is instructed to the measurer or pilot. In this way, the static pressure in the uniform flow can be quickly shown in the machine.

According to the embodiment described above, the wind pressure sensor 2 is embedded on the rope 4 towing the trailing cone so as not to generate turbulence of the air flow on the surface, thereby converting the wind pressure into an electric signal. To do. This electric signal is immediately guided to the inside of the aircraft 7 by the electric cable 3 extending through the tow line 4, and instructs the indicator 6 without delay.

Since the turbulence of the air flow is generated in a vibrating manner on the pointer or the like, it can be understood, and such data can be deleted. In this way the uniform flow static pressure can be known quickly and without error.

[0013]

As described above in detail, the present invention is a trailing cone for measuring a position error of a barometric altitude system of an aircraft. The trailing cone is a tow line for towing the cone and is embedded in the tow line. And a wind pressure sensor, and a trailing cone that is wired along the towline and has a cable that guides the detection signal of the wind pressure sensor to the indicator inside the aircraft. If the measurement is performed, the signal is transmitted quickly, and the static pressure indication error of the Pitot system can be measured more accurately. In addition, the turbulence of the air flow can be easily discriminated, and the accuracy can be expected to be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a trailing cone according to an embodiment of the present invention.

FIG. 2 is a side view showing details of an A part in FIG.

FIG. 3 is a block diagram showing a trailing cone signal system according to an embodiment of the present invention.

FIG. 4 is a side view showing a state where a conventional trailing cone is towed by an aircraft by a towing tube.

5 is a side view showing details of a B part in FIG. 4. FIG.

[Explanation of symbols]

 1 Trailing cone 2 Wind pressure sensor 3 Electric cable 4 Towline 5 Amplifier 6 Indicator

Claims (1)

[Claims] 1. A towing line for towing a cone from an aircraft, measuring wind pressure in the vicinity of the cone and guiding the wind into the aircraft, and towing the cone in a trailing cone for measuring a position error of a barometric altitude system. And, embedded in the tow line, a wind pressure sensor for measuring the wind pressure near the cone, and wired along the tow line, for transmitting an electrical signal from the wind pressure sensor to an indicating instrument in the aircraft A trailing cone equipped with a cable.