CN112487660B - Civil aircraft reliability requirement capturing method - Google Patents
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Abstract
The invention provides a civil aircraft reliability requirement capturing method, S1, establishing a generalized reliability requirement transfer model of civil aircraft equipment, defining requirements of civil aircraft users, and setting a reliability requirement transfer model as a reliability requirement block RRC = G R +Sc R (ii) a S2, describing an initial use scene of the civil aircraft according to user requirements; s3, establishing an RRC (radio resource control) model for the civil aircraft according to the initial use scene of the civil aircraft determined in the step S2, and defining G for the initial level R And Sc R (ii) a S4, according to the structures and functions of the civil aircraft, the system and the equipment, the selection of the transfer mechanism of each level of demand blocks is completed; and S5, refining the reliability requirement blocks, so that the reliability requirements of the products of all levels of the civil aircraft are obtained. The invention makes clear definition on the reliability requirement of the user and the reliability requirement of the manufacturer from the perspective of the civil aircraft stakeholder, and provides the reliability requirement derived from the user requirement.
Description
Technical Field
The invention relates to the field of civil aircraft reliability requirement determination, in particular to a civil aircraft reliability requirement capturing method.
Background
In the reliability field, the requirement of model reliability is the basis for a bearing party to develop reliability design, analysis and test, and is also the basis for an ordering party to monitor, check and accept the product reliability. Wherein the requirements are as follows: the ordering party sets technical requirements and design principles for the design of the product in order to ensure the reliability of the product from the use efficiency and the use adaptability of the product. Furthermore, the measurement of the reliability level of the product, the quantitative requirement of reliability, is composed of two parts of a reliability parameter and an index thereof, wherein the magnitude of the parameter is called the index. For the technical index of the reliability of the civil aircraft, the index requirement which can be quantized with the civil aircraft is required, and the quantitative requirement of the reliability consists of a reliability parameter and an index thereof.
Reliability requirement capture is the first step of reliability engineering, and clear and complete requirements have important significance for improving research efficiency and reducing research difficulty and cost. However, there are two major difficulties in analyzing the reliability requirements of the device. Firstly, general demand engineering analysts lack reliability knowledge and may put forward unreasonable demands; and secondly, in the process of capturing the reliability requirements by traditional reliability engineers, the traditional reliability engineers determine the reliability requirements based on experience, are too subjective, do not closely combine the operation scenes of civil aircrafts in the process of transmitting the reliability requirements, and lack reasonable basis.
Disclosure of Invention
In order to solve the above-mentioned deficiencies of the prior art, the present invention aims to provide a method for capturing reliability requirements of a civil aircraft, which can clearly define the reliability requirements of users and the reliability requirements of manufacturers from the perspective of stakeholders of the civil aircraft, and provide the reliability requirements derived from the user requirements.
Specifically, the invention provides a civil aircraft reliability requirement capturing method, which comprises the following steps:
s1, establishing a generalized reliability requirement transfer model of equipment, defining user requirements of civil aircraft equipment, wherein the user requirements comprise a plurality of reliability requirement blocks of various levels, and the reliability requirement blocks RRC = G R +Sc R ，
Wherein G is R Sc as a requirement target for reliability R A demand scenario for reliability;
G R the description rule is as follows: g R Object + behavior + degree parameter, where object represents an entity of equipment, behavior represents an action of the equipment object, and degree parameter represents a qualitative or quantitative requirement;
Sc R is described as Sc R = activity flow parameter + atomic activity parameter, where the activity flow parameter represents the direction of transfer of activity and the atomic activity parameter is:<object + environmental State + behavior + purpose>；
S2, describing an initial use scene of the civil aircraft according to user requirements;
s3, establishing an RRC model for the civil aircraft according to the initial use scene of the civil aircraft determined in the step S2, and defining G for the initial level of the RRC model R And Sc R ；
S4, selecting a transfer mechanism of each level of reliability demand blocks according to the structure and the function of the equipment of the civil aircraft; the transmission mechanism of each level of reliability requirement blocks comprises the following three strategies: the three strategies are respectively a synthesis strategy, an optional strategy and a refining strategy; the synthesis strategy is used for discovering a new reliability requirement block of the AND relation with the same level as the original reliability requirement block, namely two target reliability requirement blocks need to be met simultaneously; the optional strategy is used for discovering a new reliability requirement block in OR relation with the same level as the original reliability requirement block, namely representing different modes reaching the same result; the refining strategy is used for exploring a lower-level refining target of the original reliability demand block;
wherein the selectable policy comprises the following substeps:
s41, determining a demand target of target reliability by using a first optional strategy rule, specifically:
s411, describing a target reliability requirement block G according to a target structure rule;
s412, determining optional associated parameters in the target reliability requirement block G;
G＝{G 1 ,G 2 ,…G n }
G 1 ＝<object, behavior, degree P 1 >
G 2 ＝<Object, behavior, degree P 2 >
G n ＝<Object, behavior, degree P n >
S413, selecting a feasible parameter combination in the target reliability requirement block G;
G＝{<object, behavior, P 1 ,P 2 ,…P n >}
S414, selecting valuable parameters in the target reliability requirement block G to form a new target by OR relationship
Standard reliability requirement block G i ；G i ＝{<Object, behavior, OR (P) 1 ,P 2 ,…P n )>}；
S42, determining a demand scenario of the target reliability by using a second optional policy rule, specifically:
s421, constructing a scene graph according to the scene structure rule of the initial use scene of the civil aircraft, wherein the scene graph comprises activities and paths;
s422, keeping the relevant parameters of the reliability demand block unchanged, and listing all scene paths for realizing the same target;
Sc＝{Sc 1 ,Sc 2 ,…Sc n }
Sc 1 ＝<active flow 1 ，<Object + environmental conditions 1 + behavior 1 + purpose>>
Sc 2 ＝<Active flow 2 ，<Object + environmental conditions 2 + behaviour 2 + purpose>>
Sc n ＝<Active flow n ，<Object + environmental conditions n + behaviour n + purpose>>
S423, analyzing all possible scene paths;
s424, selecting a required scene path to form a new target reliability requirement block;
Sc＝OR{Sc 1 ,Sc 2 ,…Sc n }；
s5, combining the reliability scene and the reliability target obtained in the step S4 to obtain a final reliability demand block, thereby obtaining the technical index of the system level reliability demand of the civil aircraft under different environmental conditions, and finishing the refinement of all the reliability demand blocks according to the step S4, wherein G is the thinning process R And Sc R And G and Sc respectively, and finally acquiring the reliability requirement of each level of the civil aircraft.
Preferably, the synthesizing of the policy rule in step S4 includes the steps of:
A. checking whether an initial state is included in a final state of the scene Sc;
B. for an initial state Is not included in a scene end state, whether a certain final state Fs blocks the arrival of the initial state needs to be analyzed;
C. and (3) mutually fusing Fs and Is to construct a brand new initial state scene and a brand new final state scene, and naming a new target according to the brand new initial state scene and the brand new final state scene, wherein the fusing process comprises the following steps:
Sc new ＝AND{F S ,I S }
＝<the flow of the activity is such that,<object + AND ((environmental conditions) F + behavior F ) (environmental conditions) I + behavior I ) + mesh)>>
In the formula, AND represents a merging process for events.
Preferably, refining the policy rules in step S4 comprises the steps of:
A. connecting the new target G with each atom action in the upper-level target scene Sc;
B. newly formed demand block<G i+1 ,Sc i >；
<G i+1 ,Sc i >＝<Object + environmental conditions + behavior + goal, degree parameter P>
D. The accuracy of the atomic action of the new demand block is evaluated, AND the appropriate demand block is selected AND connected by AND to obtain a new target G i 。
Preferably, the evaluation rule of step C in the refining policy rule comprises: whether the object is clear; whether the environmental conditions are accurate and comprehensive; whether the behavior expression meets the specification and whether the target is clear.
Compared with the prior art, the invention has the following beneficial effects:
1) The reliability requirement block model is defined, and a reliability requirement capturing method of civil aircraft equipment derived based on user requirements and use scenes is provided from the aspects of the use scenes of the civil aircraft and the user requirements.
2) Compared with the traditional reliability modeling and distribution method, the reliability acquisition and distribution process combines the functional requirements and the reliability requirements of the civil aircraft, and is convenient for realizing the reliability requirements in engineering.
3) The present invention is capable of communicating requirements based on reliability in a broad sense, and is capable of communicating reliability requirements from a user to an equipment manufacturer to an equipment engineer's process. The user sets forth a reliability requirement that the main manufacturer receives from the equipment engineer.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of the reliability requirement propagation of the present invention; and
fig. 3 is a diagram of the reliability requirement block RRC of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings.
Specifically, the invention provides a civil aircraft reliability requirement capturing method, as shown in fig. 1, which comprises the following steps:
s1, establishing a generalized reliability requirement transfer model of equipment, defining user requirements of civil aircraft equipment, wherein the user requirements comprise a plurality of reliability requirement blocks of various levels, and the reliability requirement blocks RRC = G R +Sc R Wherein G is R Sc as a requirement target for reliability R Is a demand scenario for reliability.
G R The description rule is as follows: g R = object + behavior + severity parameter, where object represents an entity of equipment, behavior represents an action of equipment object, and severity parameter represents a qualitative or quantitative requirement.
Sc R Is described as Sc R = activity flow parameter + atomic activity parameter, where the activity flow parameter represents the direction of transfer of activity and the atomic activity parameter is:<object + environmental State + behavior + purpose>。
Fig. 2 is a schematic diagram of the transmission of the reliability requirement of the present invention, and fig. 3 is a schematic diagram of the reliability requirement block RRC of the present invention.
And S2, describing an initial use scene of the civil aircraft according to the user requirements.
S3, establishing an RRC model for the civil aircraft according to the initial use scene of the civil aircraft determined in the step S2, and defining G for the initial level of the RRC model R And Sc R 。
S4, selecting a transfer mechanism of each level of reliability requirement blocks according to the structure and the function of the equipment of the civil aircraft; the transmission mechanism of each level of reliability requirement blocks comprises the following three strategies: the three strategies are respectively a synthesis strategy, an optional strategy and a refining strategy; the synthesis strategy is used for discovering a new reliability requirement block of the AND relation with the same level as the original reliability requirement block, namely two target reliability requirement blocks need to be met simultaneously; the optional strategy is used for discovering a new reliability requirement block in OR relation with the same level as the original reliability requirement block, namely representing different modes reaching the same result; the refining strategy is used for exploring a refining target at a lower level of the original reliability requirement block.
Wherein the selectable policy comprises the sub-steps of:
s41, determining a demand target of target reliability by using a first optional strategy rule, specifically:
s411, describing a target reliability requirement block G according to a target structure rule;
s412, determining optional associated parameters in the target reliability requirement block G;
G＝{G 1 ,G 2 ,…G n }
G 1 ＝<object, behavior, degree P 1 >
G 2 ＝<Object, behavior, degree P 2 >
G n ＝<Object, behavior, degree P n >
S413, selecting a feasible parameter combination in the target reliability requirement block G;
G＝{<object, behavior, P 1 ,P 2 ,…P n >}
S414, selecting valuable parameters in the target reliability requirement block G to form a new target reliability requirement block G in an OR relationship i ；G i ＝{<Object, behavior, OR (P) 1 ,P 2 ,…P n )>}。
S42, determining a demand scenario of the target reliability by using a second optional strategy rule, specifically:
s421, constructing a scene according to a scene structure rule of an initial use scene of the civil aircraft, wherein the scene comprises activities and paths;
s422, keeping the relevant parameters of the reliability demand block unchanged, and listing all scene paths for realizing the same target;
Sc＝{Sc 1 ,Sc 2 ,…Sc n }
Sc 1 ＝<active flow 1 ，<Object + environmental conditions 1 + behaviour 1 + purpose>>
Sc 2 ＝<Active flow 2 ，<Object + environmental conditions 2 + behaviour 2 + purpose>>
Sc n ＝<Active flow n ，<Object + environmental conditions n + behaviour n + purpose>>
S423, analyzing all possible scene paths;
s424, selecting a required scene path to form a new target reliability requirement block;
Sc＝OR{Sc 1 ,Sc 2 ,…Sc n }。
s5, refining all the reliability requirement blocks according to the step S4, so that the reliability requirements of all the levels of the civil aircraft are obtained, and G is carried out in the refining process R And Sc R Respectively represented by G and Sc.
Preferably, the step S4 of synthesizing the policy rule includes the steps of:
A. checking whether an initial state is included in a final state of the scene Sc;
B. for an initial state Is not included in a scene end state, whether a certain final state Fs hinders the arrival of the initial state needs to be analyzed;
C. and (3) mutually fusing Fs and Is to construct a brand new initial state scene and a brand new final state scene, and naming a new target according to the brand new initial state scene and the brand new final state scene, wherein the fusing process comprises the following steps:
Sc new ＝AND{F S ,I S }
＝<the flow of the activity is such that,<object + AND ((ambient conditions) F + behaviour F ) (environmental conditions) I + behaviour I ) + mesh of>>
In the equation, AND represents a merging process for events.
Preferably, refining the policy rules in step S4 comprises the steps of:
A. connecting the new target G with each atom action in the upper-level target scene Sc;
B. new composition requirement block<G i+1 ,Sc i >；
<G i+1 ,Sc i >＝<Object + environmental conditions + behavior + goal, degree parameter P>
E. The accuracy of the atomic action of the new demand block is evaluated, AND the appropriate demand block is selected AND connected by AND to obtain a new target G i 。
Preferably, the evaluation rule of step C in the refining policy rule comprises: whether the object is clear; whether the environmental conditions are accurate and comprehensive; whether the behavior expression meets the specification and whether the target is clear.
Where reliability-generalized demand delivery refers to the process of delivering reliability demands from a user to an equipment manufacturer to an equipment engineer. The user sets forth a reliability requirement that the main manufacturer receives from the equipment engineer.
In the following, taking a civil aircraft as an example, a reliability requirement capturing process based on target-scene mixing is performed.
The first step is as follows: establishing a generalized reliability requirement transmission process, defining user requirements of civil aircraft equipment, wherein the user requirements comprise a plurality of reliability requirement blocks of various levels, and the reliability requirement block RRC = G R +Sc R ，
Wherein G is R Sc as a requirement target for reliability R A demand scenario for reliability;
G R the description rules of (1) are as follows: g R = object + behavior + degree parameter, where object represents an entity of equipment, behavior represents an action of equipment object, and degree parameter represents qualitative or quantitative requirements;
Sc R is described as Sc R = activity flow parameter + atomic activity parameter, where the activity flow parameter represents the direction of transfer of activity and the atomic activity parameter is:<object + Environment State + behavior + Objective>；
The second step is that: establishing an initial scene according to user requirements; the user requirements include a time dimension, an environment dimension, a task dimension, and a stakeholder dimension, and the initial operational scenarios include take-off, climb, cruise, and landing.
Wherein, the time dimension: the operating phase of the aircraft comprises: ground phase, taxi, take-off, climb, cruise, land and land.
Environmental dimension: consider a macro climate, a micro weather, a gravitational field, an electromagnetic environment, a runway length, a runway height, containment, air salinity, etc.
And (4) task dimension: the mission of a commercial aircraft is relatively simple, but still involves normal airline operations, flight tests, maintenance, etc. for the development process.
Stakeholder dimension: from the stakeholder's perspective, scenarios are considered, such as normal flight scenarios for the flight crew, emergency evacuation scenarios for crew and passengers, kitchen operation scenarios for the flight crew, toilet operation scenarios for the passengers, and pre-flight maintenance scenarios.
The airplane is used for fixed routes in cities A-B. And establishing an initial operation scene scheme of the airplane.
The initial operation scene of the airplane comprises take-off, climbing, cruising for 1000 kilometers, landing and the like.
The third step: according to the initial use scene of the civil aircraft determined in the step S2, establishing an RRC model for the civil aircraft, and defining G for the initial level of the RRC model R And Sc R ；
Wherein, the reliability scene is: < airplane + environmental status + behavior + target >;
the reliability targets are: < airplane + behavior + severity parameter >;
thus, an initial demand block for the aircraft may be derived based on the initial reliability scenario and the reliability target.
The initial reliability requirement block obtained specifically is:
G R 1= aircraft + course line operation + reliability 1;
Sc R 1= airplane + various environments + flying + achieving reliability requirements;
the fourth step: and (3) completing the transmission process of the reliability requirement block:
because the aircraft manufacturer adopts the mode of host integration and supply of each onboard system, the aircraft functions are transmitted in the mode, and therefore, a refining strategy mechanism is adopted for transmitting the reliability requirement blocks.
Wherein, the initial reliability requirement block RRC1 is:
G R 1= aircraft + route operation + reliability of 1;
Sc R 1= airplane + various environments + flying + achieving reliability requirements;
then, the initial reliability requirement block is refined for the first time to obtain RRC2, RRC3 and RRC4:
RRC2, RRC3 and RRC4 are specifically:
G R 2= airplane + normal environment + reliability 1;
G R 3= airplane + heavy rain + reliability 1;
G R 4= airplane + strong wind + arrival route reliability of 1;
and then, respectively refining RRC, RRC3 and RRC4 for the second time to obtain a reliability scene as follows:
Sc R 21= airplane + normal environment + takeoff + meeting reliability requirements;
Sc R 22= airplane + normal environment + climb + meeting reliability requirements;
Sc R 23= airplane + normal environment + cruise + meeting reliability requirements;
Sc R 24= airplane + normal environment + landing + meeting reliability requirements;
Sc R 31= airplane + rainstorm + takeoff + meeting reliability requirements;
Sc R 32= airplane + rainstorm + climbing + meeting reliability requirements;
Sc R 33= airplane + rainstorm + landing + meeting the reliability requirement;
Sc R 41= airplane + strong wind + take-off + meeting the reliability requirement;
Sc R 42= airplane + strong wind + climbing + meeting the reliability requirement;
Sc R 43= airplane + strong wind + landing + meeting reliability requirements;
and fifthly, combining the reliability scene and the reliability target obtained in the fourth step to obtain a final reliability demand block, so as to obtain the reliability demand technical indexes of the engine and the flight control system under different environmental conditions.
RRC21= airplane + normal environment + airplane engine acceleration + reliability requirement 1;
RRC22= airplane + normal environment + airplane control plane and operation + meets the reliability requirement 1;
RRC31= aircraft + storm + aircraft engine acceleration + reliability requirement 1;
RRC32= airplane + rainstorm + airplane control surface and operation + meets the reliability requirement 1;
RRC41= airplane + strong wind + airplane engine acceleration + reliability requirement 1;
RRC42= airplane + strong wind + airplane control surface and operation + meets the reliability requirement 1;
compared with the prior art, the invention has the following beneficial effects:
1) The reliability requirement block model is defined, and a reliability requirement capturing method of civil aircraft equipment derived based on user requirements and use scenes is provided from the aspects of the use scenes of the civil aircraft and the user requirements.
2) Compared with the traditional reliability modeling and distribution method, the reliability acquisition and distribution process combines the functional requirements and the reliability requirements of the civil aircraft, and is convenient for realizing the reliability requirements in engineering.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. A civil aircraft reliability requirement capturing method is characterized by comprising the following steps: which comprises the following steps:
s1, establishing a generalized reliability requirement transfer model of civil aircraft equipment, defining user requirements of the civil aircraft equipment, wherein the user requirements comprise a plurality of reliability requirement blocks of each level, and a reliability requirement block RRC comprises a requirement target G of the reliability requirement blocks R And a requirement scenario Sc for reliability requirement blocks R ，
Requirement target G of the reliability requirement block R The system comprises three parameters of an object, a behavior and a degree, wherein the object represents an entity of equipment, the behavior represents an action of the equipment object, and the degree represents qualitative or quantitative requirements; requirement scenario Sc for reliability requirement blocks R The system comprises an activity flow parameter and an atomic activity parameter, wherein the activity flow parameter represents the transmission direction of the activity, and the atomic activity parameter comprises an object, an environment state, a behavior and a purpose;
s2, describing an initial use scene of the civil aircraft according to user requirements, wherein parameters of the user requirements comprise a time dimension, an environment dimension, a task dimension and a stakeholder dimension;
s3, establishing an initial RRC model for the civil aircraft according to the initial use scene of the civil aircraft determined in the step S2<G R ,Sc R >And respectively defining G for the initial level of the RRC model R And Sc R ；
S4, selecting one of a plurality of reliability requirement block transfer mechanisms according to the structure and the function of the equipment of the civil aircraft; wherein the plurality of reliability requirement block delivery mechanisms comprises the following three delivery mechanisms: an optional policy delivery mechanism, a composition policy mechanism, and a refining policy mechanism;
the optional policy delivery mechanism is used to discover new reliability requirement blocks having an OR relationship with the same level as the original reliability requirement blocks, i.e. representing different ways to achieve the same result;
the synthetic strategy transfer mechanism is used for discovering a new reliability requirement block of the AND relation with the same level as the original reliability requirement block, namely two target reliability requirement blocks need to be met simultaneously;
the refining strategy transfer mechanism is used for exploring a refining target reliability demand block which is one level lower than the original reliability demand block;
wherein, the selectable policy delivery mechanism comprises the following two substeps:
s41, determining a requirement target G of a target reliability requirement block by using a first optional strategy rule i The method specifically comprises the following steps:
s411, describing an initial target reliability requirement block G according to a target structure rule;
s412, determining all optional associated parameter combinations in the initial target reliability requirement block G;
G＝{G 1 ,G 2 ,…G n }
G 1 ＝<object, behavior, degree P 1 >
G 2 ＝<Object, behavior, degree P 2 >
G n ＝<Object, behavior, degree P n >
S413, selecting a feasible parameter combination in the target reliability requirement block G from all the associated parameter combinations in the step S412;
G＝{<object, behavior, P 1 ,P 2 ,…P n >}
S414, selecting valuable parameters in the target reliability requirement block G from all the related parameter combinations in the step S412, and forming the requirement target G of the target reliability requirement block by using OR relation i ；
G i ＝{<Object, behavior, OR (P) 1 ,P 2 ,…P n )>}；
S42, determining a requirement scene Sc of the target reliability requirement block by using a second optional strategy rule, specifically:
s421, constructing a scene graph according to a scene structure rule of an initial use scene of the civil aircraft, wherein the scene graph comprises activities and paths;
s422, keeping the relevant parameters of the reliability requirement block unchanged, and listing all requirement scene paths for realizing the same target;
Sc＝{Sc 1 ,Sc 2 ,…Sc n }
Sc 1 ＝<active flow 1 ，<Object + environmental conditions 1 + behavior 1 + purpose>>
Sc 2 ＝<Active flow 2 ，<Object + environmental conditions 2 + behaviour 2 + purpose>>
Sc n ＝<Active flow n ，<Object + environmental conditions n + behaviour n + purpose>>
S423, analyzing all possible scene paths;
s424, selecting a required scene path, and forming a required scene Sc of a new target reliability requirement block:
Sc＝OR{Sc 1 ,Sc 2 ,…Sc n }；
s5, combining the reliability scenes and the reliability targets obtained in the step S4 to obtain final reliability demand blocks, thereby obtaining the reliability demand technical indexes of all the systems of the civil aircraft under different environmental conditions, and finishing the refinement of all the reliability demand blocks according to the step S4, wherein G is the refinement process in the refinement process R And Sc R And G and Sc respectively, and finally acquiring the reliability requirement of each level of the civil aircraft.
2. Civil aircraft reliability requirement capture method according to claim 1, characterized in that: the synthetic strategy delivery mechanism in step S4 includes the following steps:
A. checking whether the final state of the demand scene Sc contains the demand scene of the initial state;
B. for the initial state Is not included in the final state of the scene, analyzing whether a certain final state Fs hinders the arrival of the initial state;
C. mutually fusing a final state Fs of a certain demand scene and an initial state Is of the demand scene, constructing a brand-new initial state and final state scene, and naming a new target demand scene according to the original initial state and the final state, wherein the fusion process comprises the following steps:
Sc new ＝AND{F S ,I S }
＝<the flow of the activity is such that,<object + AND ((ambient conditions) F + behavior F ) (environmental conditions) I + behaviour I ) + mesh of>>
In the equation, AND represents a merging process for events.
3. The civil aircraft reliability requirement capture method of claim 2, wherein: the refining strategy delivery mechanism in the step S4 comprises the following steps:
A. connecting the new target G with each atom action in the upper-level target scene Sc;
B. newly formed reliability requirement block<G i+1 ,Sc i >；
<G i+1 ,Sc i >＝<Object + environmental conditions + behavior + goal, degree parameter P>
C. Carrying out accuracy evaluation on the atomic actions of the new reliability demand blocks, selecting appropriate demand blocks AND connecting the demand blocks by AND to obtain a new target G i 。
4. The civil aircraft reliability requirement capture method of claim 3, wherein: the principle of the accuracy evaluation of the step C in the refining policy rule comprises the following steps: whether the object is clear; whether the environmental conditions are accurate and comprehensive; whether the behavior expression meets the specification and whether the target is clear.
5. The civil aircraft reliability requirement capture method of claim 3, wherein: the initial use scenario in step S2 includes takeoff, climb, cruise and landing.
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