Flight test


aircraft and its power devices and mechanical equipment under real flight environmental conditions. It is generally divided into four types: (1) Development aircraft test. Weapons and equipment have begun to experiments with the identification of the identification. (2) Identification of the stereotype test. A test for the new weapon equipment in a stereotype state to achieve tactical technical indicators and use requirements. (3) Test flight test. Tests for testing the quality of the weaponry or the basic performance of its inventory. (4) Use the flight test. In order to assess the test of the tactical properties of weapons under practical use conditions, use the method of use.

Flight Test Program

usually has two types of flight test procedures - business and military. Commercial flight tests to prove that the aircraft meets all applicable safety and performance requirements of government certification bodies. In the United States, it is the US Federal Aviation Administration (FAA); in Canada, the Canadian Transportation Bureau (TC); in the UK, the Civil Aviation Administration; in the EU, the European Aviation Safety Agency (EASA). Since commercial aircraft development is usually funded by aircraft manufacturer or private investors, the certification body has no stakeholder's business success on the aircraft. These civil institutions pay attention to the safety of the aircraft, and the pilot's flight manual accurately reported the performance of the aircraft. The market will determine the applicability of the aircraft on operators. Typically, civil certification bodies do not participate in flight testing until the manufacturer discovers and fixes any development problems and is ready to find certification.

Flight test

The military program is different from business programs, as the government has signed contracts, designs and manufacturing aircraft with aircraft manufacturers to meet specific task capabilities. These performance requirements are recorded in the aircraft specification, the details of the flight test procedure (requirement in many other programs) to be described in detail in the operating manual. In this case, the government is a customer and has a direct interest relationship with the ability to perform tasks with the aircraft. Because the government funds the plan, it participates in the aircraft design and test from the early days.

UAV flight test

This flight test total flying operation 3 times. The first test is mainly to verify the imaging ability of the drone remote sensing system. The second time, the track plan is carried out according to the requirements of the remote sensing operation, and the latitude and longitude of the start point will automatically start shooting, and the remote sensing device is automatically closed according to the latitude latitude and longitude of the end point. Verify the functions such as track planning, remote sensing air control subsystem, and data acquisition, data transfer, and fast view display. The third test focused on verifying the compression decompression function, and the previous two tests have some problems have achieved better results. Since the focus of the trial is different, in the three flight test, the second flight test is designed in accordance with the requirements of the air remote sensing. The design of the route is flying in the direction, so the curvature of the route can be calculated according to the latitude of the actual flight route. According to the requirements of the seim, the route bend is not more than 3%. The maximum curvature of the route of this flight test is 1.4% to meet the requirements of flight.

Wind tunnel virtual flight test

Traditional static wind tunnel test, small amplitude forced oscillation test, tail rotable wind tunnel test, single axis and multi-axis coordination large amplitude forced oscillation test, etc. Unable to effectively simulate the aircraft motor motion process, need to develop a trial method that can be more realistic simulated real-world flying process --- wind tuning virtual flight test. The wind tunnel virtual flight test is to mount the aircraft model on a special support device with three rotational degree of freedom in the wind tunnel, so that three angular dispersion can be freely rotated or manipulated in real time according to the flight requirements of the aircraft, and achieve more realistic Simulate the aircraft motor motion process, and measure the aircraft pneumatic and motion parameters, test the aircraft response and manipulation control characteristics, and achieve pneumatic / motion integration research, explore the purpose of pneumatic / motion coupling mechanism. In response to a typical missile, the flight simulation of the opening-loop control and closed loop control of the three-degree-degree of pitch movement in lead-flapping plane was carried out, and the main differences between wind tunnel virtual flight tests and real flights were analyzed. Simulation method for wind tunnel virtual flight test.

Missile open loop control motion simulation results show that there is a significant difference between the movement of the open-loop control of the offline displacement constraint, and cannot realize the real flight. Therefore, the wind tunnel virtual flight test cannot be used to open loop control. To this end, there is a milestive pitch motor closed loop control flight simulation method to analyze the simulation method of wind tunnel virtual flight test.

Controlled the classic three-circuit automatic driver, using a closed-loop control method of pitch angle velocity feedback, the wind tunneling virtual flight test can compensate for the influence of line displacement constraints, and achieve more realistic simulation real flight. However, due to the impact of speed changes, it will cause some differences between wind tunneling virtual flight tests and real flights.

Foreign ultrasound flight test Enlightenment

From many flight test projects, there are two timing of flight test schedules: one is in basic research and key technology research, unable The project is verified by the ground test, and the flight test is required; the other is a flight test when the key technical research is progressing to a certain extent, and it is necessary to perform a flight test when pneumatic, power, structure, control and other technical integration verification. Most of the United States a flight test project in 2000 belongs to the former one. The flight test projects conducted after 2000 belong to the latter kind, and the current flight test items currently in other countries are the former situation.

Flight test is an important research method for high ultrasound research abroad, take step-by-step, gradually verification technology route, from the short-term self-directed flight, and then fly from single technology to Multiple technical integration verification.

Initial, US, Russia and other countries choose to use mature technology to develop flight test platforms, conduct research and flight demonstrations for key technologies such as supermunitary stamping engine, body / advancement, flight control, and focus It is a research and verification of over-combustion engine technology.

The air skyline is a long-term goal. On the current research level of countries, it is not possible. At present, countries still start from mechanism and basic issues, and use domestic and international cooperation methods to carry out basic research.

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