Tokyo Aircraft Instrument Co., Ltd.

Japan Aerospace Exploration Agency

Fuji Heavy Industries Ltd.

National Aerospace Laboratory of Science Technology Agency

Toru Iwata

Teruomi Nakaya

Seizo Suzuki

Hiroshi Wakai

Akira Koike

Naoaki Kuwano

Makoto Ueno

Masashi Shigemi

Asao Hanzawa

Yoshio Hayashi

Masao Ebihara

Takashi Saitow

Tomonari Hirotani

Mitsuo Usami

It is an object of the present invention to solve the problem of a drop in precision in conventional systems using a square pyramid type five-hole probe due to the drop in atmospheric pressure in high altitude ranges, and to provide a wide velocity range flight velocity vector measurement system that can prevent a drop in measurement precision. Furthermore, it is also an object of the present invention to provide a method for eliminating the effects of detection fluctuations caused by adhering water droplets, ice particles or dust in a wide velocity range flight velocity vector measurement system. The flight velocity vector measurement probe of the present invention comprises means in which a static pressure hole is formed in the tube wall surface of the probe, so that a static pressure value is obtained from the pressure detected by this static pressure hole, the Mach number M is calculated on the basis of an equation approximated by a fourth-order polynomial of the static pressure/total pressure signal and the angle of attack, and in cases where an abnormal detection value is detected, this is replaced by the preceding detection value.

High-altitude capable wide velocity range flight velocity vector measurement probe and measurement system

A flight velocity detection system using a truncated pyramid-shape multi-e Pitot probe in which an extreme end portion has a truncated pyramid-shape, a cylindrical hole is provided at the apex thereof, a total pressure tube of a smaller diameter than that of the cylindrical hole is secured at a position by a predetermined length determined by a relationship with the diameter of the cylindrical hole from the extreme end of the cylindrical hole, and groups of pressure holes comprised of a plurality of pressure holes are arranged in each of the truncated pyramid surfaces of the truncated pyramid shape. Items of pressure information detected by the probe are input into a velocity vector processor to convert them into electric signals, and signals are processed using pressure coefficients of the holes of the probe with respect to the velocity vector stored in advance in the velocity vector processor to calculate flight velocity vector (V, .alpha., .beta.) with respect to the probe axis from the pressure information and air density.

Truncated pyramid-shape multi-hole pitot probe and flight velocity

Growing community of inventors

Tokyo, Japan

Toru Iwata