A design-oriented system elasticity evaluation method

Abstract

The application provides a design-oriented system elasticity evaluation method, and the specific steps are as follows: step (1): based on the component entities and implementation logic of the system, all path sets for achieving the system target are found; step (2): the number of path sets is counted, and the height of the path set space is calculated; step (3): the length of each path set is counted, and the length of the path set space is calculated; step (4): the redundancy of the system entity composition is counted, and the width of the path set space is calculated; step (5): the elasticity of the system is calculated, and the elasticity measurement evaluation of the system is realized. The application provides a design-oriented elasticity evaluation method for the elasticity evaluation of the system. Starting from the logic and path set of the system, the path set space of the system oriented to elasticity is formed. On this basis, the redundancy of the entity is defined, and the length, height and width of the path set space are calculated, and finally the elasticity evaluation of the system is realized. The evaluation method starting from the implementation approach effectively improves the operability of the system elasticity design.

Description

(I) Technical Field

[0001] This invention relates to the field of system resilience assessment, and more specifically to a design-oriented system resilience assessment method. (II) Background Technology

[0002] Resilience, as a fundamental attribute of a system, is increasingly linked to general quality characteristics such as reliability and maintainability. Under normal circumstances, a system can operate smoothly, but due to human or natural factors, it inevitably suffers disturbances or shocks. Resilience involves multiple aspects, including the system's stable operating state, its ability to withstand disturbances, and its recovery effectiveness; therefore, it is considered an important system characteristic.

[0003] Existing resilience assessment methods are mostly geared towards systems in operation, focusing on evaluating the system's recovery performance after disturbances and shocks, making them difficult to apply to the design phase. However, like other quality characteristics such as system reliability, maintainability, and supportability, the design phase should receive sufficient attention. Therefore, it is essential to develop a new resilience assessment method from a design perspective to guide system designers in their design process. (III) Summary of the Invention

[0004] To address the shortcomings of existing resilience assessment methods in guiding the design process and improve the operability of system resilience design, this invention proposes a design-oriented system resilience assessment method. This method rationally assesses system resilience from the perspectives of system logical structure, implementation process, and resource allocation. The specific steps are as follows:

[0005] Step (1): Based on the system's constituent entities and implementation logic, find all path sets that achieve the system's objectives;

[0006] Step (2): Count the number of road sets and calculate the height of the road set space;

[0007] Step (3): Calculate the length of each path set and the length of the path set space;

[0008] Step (4): Calculate the redundancy of the system entities and the width of the path set space;

[0009] Step (5): Calculate the system's resilience and realize the system's resilience assessment.

[0010] In step (1), based on the system's constituent entities and implementation logic, and referring to the functional execution of each entity, all path sets are found. First, the operations that each type of entity can perform are determined. Then, under each layer of logic, i.e., the combination of each type of operation, the entity combination that implements each type of operation is found to form the minimum path set. Let N be the total entities, and define any entity as Agent. iAnd the operations that each entity can perform are known. Then M path sets can be formed, denoted as MP = {MP1, MP2, ..., MP...} m ,…,MP M},MP m ={Agent i Agent j Agent k}

[0011] In step (2), a path set space is formed based on all path sets from step (1), as follows: Figure 2 As shown. Count the number of all path sets, which is the height H of the path set space, i.e., H = M.

[0012] In step (3), let a certain path set MP m Length L m Define and calculate the length of the system path set space as:

[0013]

[0014] In step (4), starting from each path set, the required number of entity types and their corresponding quantities, as well as the total number of entities in the system, are counted. Clearly, for a given path set MP... m The required number of entity types and the path set length L m Similarly, for a certain entity Agent k The required number is denoted as n. m,k The Agents possessed by the system k The number is s k Then, in the path set corresponding to the current logic, for Agebt... k The number of redundant entities is:

[0015] r m,k =s k -n m,k

[0016] In a certain path set MP m In the middle, define Agent k The redundancy is:

[0017]

[0018] Clearly, the higher the redundancy of an entity, the higher the redundancy of the path set, and the greater the improvement in system resilience. Similarly, the higher the redundancy of a path set, the greater its contribution to achieving the system goal. Therefore, the redundancy of a path set is defined based on the degree of entity redundancy as follows:

[0019]

[0020] This formula represents the redundancy per unit step length of the road set. This demonstrates that reducing the length of the road set (simplifying the design) or increasing the width of the road set (redundant design) can effectively improve the resilience of the road set.

[0021] It is easy to see that increasing the redundancy of each path set will improve system resilience, so the width of the path set space can be defined and calculated based on this indicator:

[0022]

[0023] In step (5), the resilience of the entire system is evaluated based on the set characteristics of the path set space. A path set represents one way to achieve the system's objective; therefore, multiple logic designs and multiple entity selections create multiple path sets for the system, effectively resisting external disturbances and achieving resilient design. From this perspective, the resilience of the system is defined using the path set space as follows:

[0024]

[0025] As can be seen from this formula, increasing the redundancy RA of a certain entity m,k Shorten the length L of the path set m In addition, improving M through multi-logic design can effectively enhance system resilience, which greatly improves the operability of system resilience design. (iv) Description of the attached drawings

[0026] Figure 1 System resilience assessment flowchart

[0027] Figure 2 Schematic diagram of the system's flexible design scheme

[0028] Figure 3 System Target Implementation Logical Structure Diagram

[0029] Figure 4 Redundancy of each path set (V) Detailed Implementation

[0030] Exemplary embodiments of the present invention have been described in detail below with reference to the accompanying drawings. The following description includes specific details to aid understanding, but these details should be shown as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various instances described herein without departing from the scope and spirit of this disclosure. Furthermore, descriptions of well-known functions and structures have been omitted for clarity and brevity.

[0031] The terms and words used in the following description and claims are not limited to their literal meaning, but are intended only for the clear and consistent understanding of the inventors in carrying out the invention. Therefore, it will be clear to those skilled in the art that the following description of various exemplary embodiments of the invention is provided for illustrative purposes only and is not intended to limit the invention as defined by the appended claims and their equivalents.

[0032] The following uses the method proposed in this patent to evaluate the flexible design of a certain system.

[0033] Step (1): First, determine the logical process for achieving the system goal based on the objective, specifically as follows: Figure 3 As shown in Table 1. Then, based on the entities and their functions in the system (as shown in Table 1), all path sets are found, and the path sets are shown in Table 2.

[0034] Step (2): Find the available entity types and functions in the current system, as shown in Table 1.

[0035] Table 1 Entity Types and Their Functions

[0036]

[0037] Based on the current entity functions, the minimum path set is formed under three logics as shown in Table 2.

[0038] Table 2 Minimum Path Set for System Objectives

[0039]

[0040] Step (2): Count the number of path sets in the path set space. As shown in Table 2, under the design logic in 3 and the design conditions of 6 entities, there are a total of 5 minimum path sets, so H = 5.

[0041] Step (3): Calculate the length of each path set, as shown in Table 3.

[0042]

[0043] Calculate the length of the path set space:

[0044]

[0045] Step (4): The required entity types and number of redundancies for each road set are shown in Table 3.

[0046] Table 3 shows the number of redundancies (r) of each entity in the path set. m,k )

[0047]

[0048] Calculate the redundancy RA of each entity in the path set. m,kThe redundancy of each path set is shown in Table 4 and... Figure 4 As shown.

[0049] Table 4. Redundancy (RA) of each entity in the path set m,k )

[0050]

[0051] Depend on Figure 4 It can be seen that, with the same road set length, such as MP3 and MP5, MP3 has higher road set redundancy due to its higher entity redundancy, resulting in better flexibility. Calculate the width of the road set space:

[0052]

[0053] Step (5): Calculate the system's elasticity based on the length, width, and height of the path set space.

[0054]

[0055] The system resilience value is 0.4797. Increasing the height of the road set space by adding to the system's implementation logic, adjusting the system's entity composition to increase the width of the road set space, and shortening the length of the road set space can all effectively improve the system's resilience, greatly facilitating system resilience design.

Claims

1. A design-oriented system resilience evaluation method, characterized in that, include: Step (1): Based on the system's constituent entities and implementation logic, find all path sets that achieve the system's goals; Step (2): Count the number of road sets and calculate the height of the road set space; characterized in that, a road set space is formed based on all road sets in step (1), and the number of all road sets is counted. Define the height of the path set space. ; Step (3): Calculate the length of each path set and the length of the path set space; characterized in that, let a certain path set... Length is Define and calculate the length of the system path set space as: ； Step (4): Calculate the redundancy of the system entities and the width of the path set space; characterized in that, for a certain path set... The required number of entity types and the length of the path set Same, for a certain entity The required number is denoted as The system possesses Number of Then, in the path set corresponding to the current logic, for The number of redundant entities is: ， In a certain road set In the middle, the definition The redundancy is: ， The redundancy of this path set is defined based on the redundancy of the entities: ， Based on redundancy Define and compute the width of the path set space: ， Where H is the path set space height defined in step (2); Step (5): Calculate the system's resilience and realize the system's resilience assessment. Its characteristic is that, starting from the path set space, i.e., the means to achieve the system's objective, the system's resilience is defined using the path set space as follows: ， In the formula, For system resilience, the other relevant parameters have the same meaning as in the aforementioned steps.

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