CN-122020238-A - Method for evaluating risk level of envelope extension type flight test status point

CN122020238ACN 122020238 ACN122020238 ACN 122020238ACN-122020238-A

Abstract

The invention discloses a method for evaluating risk grades of envelope extension type flight test status points, which comprises the steps of designing an envelope extension type flight test status point according to initial safety value, limiting value and other information of an envelope to be extended (speed, overload, attack angle and the like) related in a flight subject, establishing a method for calculating risk metric values of single envelope extension type flight status points in a flight test, establishing a method for calculating risk metric values of a plurality of envelope extension type flight status points in the flight test based on the risk metric values of the single envelope extension type flight status points, designing a risk grading table, intuitively representing the risk grades of the flight status points through grades and color bands, obtaining the risk grades of the flight status points through the positions of the risk metric values of the flight status points in the risk analysis table, and forming an envelope extension type flight test status point optimizing method based on the risk grades of the flight status points. The embodiment of the invention solves the difficult problem of evaluating the risk level of the pilot flight state point in the envelope extension pilot flight design, and is beneficial to pilot flight design optimization by pilot flight designers according to the visual risk level so as to balance pilot flight progress, cost and pilot flight risk.

Inventors

Kou Baozhi
ZHANG HONGLIN
LEI MING
WANG DONGSEN
WANG ZEJI

Assignees

中国飞行试验研究院

Dates

Publication Date: 20260512
Application Date: 20251227

Claims (9)

1. A method for evaluating the risk level of a state point of a covered wire extension type flight test is characterized by comprising the following steps: Step 1, designing test flight status points of the test flight subjects of the envelope extension test flight subjects according to initial safety values and limit value information of the to-be-extended envelope related in the test flight subjects; Step 2, constructing a risk metric calculation model of a single envelope expansion test flight state point in a flight test; step 3, based on a risk measurement calculation model of a single envelope extension test flight state point, establishing a calculation model of risk measurement values of a plurality of envelope extension test flight state points in a flight test; step 4, according to the history data of the related subjects, designing a risk classification table, and visually representing the risk level of the test flight state point through the level and the color band; step 5, calculating the acquired risk metric value in the step 2, and comparing the positions of the risk classification scales designed in the step 4 to confirm the risk level of the test flight state point; And 6, intuitively judging whether the risk level of the state point is suitable for execution or not by a designer, if the risk level of the state point is higher, optimizing parameters of the test flight state point, performing calculation and evaluation in the steps 1 to 5, and if the risk level of the designed test flight state point accords with design expectations, executing tasks.
2. The method for evaluating risk level of a state point of a flight test of the envelope extension type according to claim 1, wherein in the step 1, the initial safety value represents a safety reference value of the envelope of the aircraft, that is, the state point has been flown a plurality of times before the extension test flight and is verified to meet design expectations.
3. The method for evaluating risk level of a test state point of a covered wire extension type flight according to claim 1, wherein three factors based on the calculation of risk metric values of a single covered wire extension test state point in the step 2 are: (1) The closer to the boundary, the higher the risk is in the area to be expanded of the envelope; (2) In extension, the larger the test step, the higher the risk thereof; (3) The more the accumulated flown state points are in the envelope expansion process, the lower the risk is; The risk metric value calculation method comprises the following steps: Step 21, respectively designing calculation formulas of risk metric values for three factors according to three factors on which the calculation of the risk metric value of a single envelope expansion test flight state point is based and the information such as an initial safety value, a limiting value and the like of the single envelope calculated in the step 1, wherein the calculation formulas of the risk metric values of the three factors are all 0-1, and the closer the risk metric value is to 1, the larger the risk is represented; Step 22, calculating or evaluating the weight coefficient of three factors according to which the risk metric value of the single envelope expansion test flight state point is calculated, wherein the three weight coefficients are all 0-1, and the sum of the three weight coefficients is 1; step 23, calculating the product sum of the risk metric value of each factor in step 21 and the weight coefficient of the corresponding factor in step 22, and forming the risk metric value of the single envelope extension test flight state point, wherein the closer the risk metric value is to 1, the greater the risk is.
4. A method for evaluating risk level of a test state point of a covered wire extension type flight according to claim 3, wherein in the step 21, the risk is higher as the test state point is located closer to the boundary in the covered wire to be extended for a single covered wire extension; the risk metric calculation model at the envelope expansion state point is: (1) Wherein, the The value is 0-1, and the risk degree is linearly increased as the expansion value gets closer to the boundary.
5. A method for evaluating the risk level of a test state point of a covered wire extension type flight according to claim 3, wherein in said step 21, the greater the test step length, the higher the risk thereof in the extension for a single covered wire extension test state point in said step 2; the risk metric calculation model at the envelope expansion state point is: (2) Wherein: The value is 0-1, and the risk degree is linearly increased along with the increase of the expansion step length.
6. A method for evaluating the risk level of a test state point of a package extension type flight according to claim 3, wherein in the step 21, the more the accumulated flown state points are in the package extension process for a single package extension test flight state point, the lower the risk thereof is; the risk metric calculation model at the envelope expansion state point is: (3) Wherein: the value of 0-1 is a description that the dot accumulation is more and more along with the flown expansion state, and the risk degree is gradually reduced by the reciprocal.
7. The method for evaluating risk levels of the status points of the envelope extension type flight test according to claim 3, wherein the method for forming the weight coefficients of the three factors in the step 22 comprises the following steps: Step 221, using initial suggested values of three weight coefficients as unknowns, adopting historical similar type aircraft related envelope extension test flight state point data, obtaining risk measurement value data of each test flight state point with the initial suggested values of the three weight coefficients, constructing an objective function according to the minimum variance of the risk measurement values of all design state points, using the value range of each weight coefficient as 0-1, using the sum of the three weight coefficients as 1, solving the constructed optimization problem as a condition of the optimization problem, and obtaining the initial suggested values of the three weight coefficients in single envelope extension; Step 222, directly adopting initial suggested values of three weight coefficients in single envelope expansion formed in step 221 as final weight coefficient values, or considering differences of different envelopes and different flight state point risks aiming at the three factors according to three factors in the expanded envelope, and adjusting the values of the three weight coefficients in step 221 at each flight state point based on the initial values of the three weight coefficients to determine final weight coefficient values, wherein the adjusted final weight coefficient values still need to meet the conditions that the value range of each weight coefficient is 0-1 and the sum of the three weight coefficients is 1.
8. The method for evaluating the risk level of the status point of the envelope extension type flight test according to claim 1, wherein the step 3 specifically comprises the following steps of; Step 31, calculating the state point risk metric value of each single envelope expansion in the designed test flight state points respectively; Step 32, selecting the maximum value of each single envelope expansion risk metric value in the test flight state point as the main value of the risk metric values of the plurality of envelope expansion test flight state points, taking the sum value of the products of each single envelope expansion risk metric value of the test flight state point as the coupling risk value brought by the plurality of envelope expansion, and adding the main value of the risk metric value and the coupling risk value as the reference value of the risk metric values of the plurality of envelope expansion test flight state points; step 33, if the reference value of the risk metric values of the plurality of envelope expansion test flight status points is greater than 1, directly taking 1, and finally forming the risk metric values of the plurality of envelope expansion test flight status points, wherein the closer the risk metric value is to 1, the greater the risk is.
9. The method for evaluating the risk level of the envelope extension type flight test status point according to claim 1 is characterized in that the risk classification table in the step 4 is filled with color bars within a value range of 0-1, risk areas are divided, danger prompts are marked, corresponding implementation suggestions are marked, and the risk level of the envelope extension type flight test status point is confirmed by comparing the calculated risk measurement value obtained in the step 2 with the position of the risk classification table designed in the step 3.

Description

Method for evaluating risk level of envelope extension type flight test status point Technical Field The invention belongs to the technical field of flight tests, and particularly relates to a method for evaluating risk grades of status points of an envelope extension type flight test. Background In the test flight engineering with the characteristics of remarkably high risk, high investment and high technical content, as newly-researched aviation equipment is more and more, the flight test faces the problems of task repetition, quick iteration of new technology verification requirements, tight development progress requirements and the like, so that the test flight safety problem is particularly outstanding. The first thing to face in the new machine platform test flight is the expansion task of important envelope such as speed, altitude, overload, angle of attack, etc., and envelope expansion type flight test often faces huge risk. At present, aiming at each test flight subject, the division criteria and the risk subject classification of each risk subject are specified in GJB626A-2006, but in the specific design and implementation links of typical envelope extension type flight test with high risk, the selection of test status points and the determination of extension step length often depend on the existing experience, a method for risk assessment of extension test flight status points is not yet available at present so as to guide the selection of test status points and intuitively express the risk grade of the test flight status points. Disclosure of Invention The embodiment of the invention provides a method for evaluating the risk level of a test flight state point in a test flight of an envelope extension class, which aims to solve the difficult problem of evaluating the risk level of the test flight state point in the test flight design of the envelope extension class, guide the selection of the test state point, intuitively express the risk level of the test flight state point and improve the operability of the risk evaluation of the test flight state point in the subject of the envelope extension class. An intuitive risk level assessment method is provided for flight design optimization of flight designers to balance flight progress, cost and flight risk. Meanwhile, the test flight risk brought by the fact that the designed state point does not consider the extension envelope range is ignored in the test flight design of the non-envelope extension test flight subjects in the initial test flight stage of the new machine is avoided. The embodiment of the invention provides a method for evaluating risk level of a state point of an envelope extension type flight test, which comprises the following steps: Step 1, designing test flight status points of a test flight subject according to initial safety values, limit values and the like of a to-be-expanded envelope (such as speed, overload, attack angle and the like) related in the test flight subject; Step 2, constructing a risk metric calculation model of a single envelope expansion test flight state point in a flight test; step 3, based on a risk measurement calculation model of a single envelope extension test flight state point, establishing a calculation model of risk measurement values of a plurality of envelope extension test flight state points in a flight test; step 4, according to the history data of the related subjects, designing a risk classification table, and visually representing the risk level of the test flight state point through the level and the color band; step 5, calculating the acquired risk metric value in the step 2, and comparing the positions of the risk classification scales designed in the step 4 to confirm the risk level of the test flight state point; And 6, intuitively judging whether the risk level of the state point is suitable for execution or not by a designer, if the risk level of the state point is higher, optimizing parameters of the test flight state point, performing calculation and evaluation in the steps 1 to 5, and if the risk level of the designed test flight state point accords with design expectations, executing tasks. Optionally, in the step 1, the initial safety value represents a safety reference value of the envelope of the aircraft, that is, the status point has been flown a plurality of times before the extended test flight and is verified to conform to the design expectations. Optionally, three factors according to which the risk metric value of the single envelope extension test flight status point in the step 2 is calculated are: (1) The closer to the boundary, the higher the risk is in the area to be expanded of the envelope; (2) In extension, the larger the test step, the higher the risk thereof; (3) The more flown state points are accumulated during the envelope extension, the lower the risk thereof. The risk metric value calculation method comprises the following steps: Step 21, respectively d