WO2022170719A1 - 基于有效区域的多目标优化设计方法 - Google Patents
基于有效区域的多目标优化设计方法 Download PDFInfo
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- WO2022170719A1 WO2022170719A1 PCT/CN2021/102975 CN2021102975W WO2022170719A1 WO 2022170719 A1 WO2022170719 A1 WO 2022170719A1 CN 2021102975 W CN2021102975 W CN 2021102975W WO 2022170719 A1 WO2022170719 A1 WO 2022170719A1
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- bacteria
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- fitness value
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- 238000013461 design Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 31
- 241000894006 Bacteria Species 0.000 claims abstract description 243
- 230000001580 bacterial effect Effects 0.000 claims abstract description 115
- 238000004891 communication Methods 0.000 claims abstract description 45
- 230000002431 foraging effect Effects 0.000 claims abstract description 13
- 230000014759 maintenance of location Effects 0.000 claims abstract description 5
- 101150055297 SET1 gene Proteins 0.000 claims description 83
- 238000005457 optimization Methods 0.000 claims description 65
- 230000001149 cognitive effect Effects 0.000 claims description 40
- 230000033001 locomotion Effects 0.000 claims description 21
- 230000001174 ascending effect Effects 0.000 claims description 20
- 230000010076 replication Effects 0.000 claims description 16
- 101150117538 Set2 gene Proteins 0.000 claims description 15
- 230000005012 migration Effects 0.000 claims description 14
- 238000013508 migration Methods 0.000 claims description 14
- 238000012216 screening Methods 0.000 claims description 14
- 230000036541 health Effects 0.000 claims description 12
- 101100042371 Caenorhabditis elegans set-3 gene Proteins 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000009182 swimming Effects 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000010415 tropism Effects 0.000 claims description 2
- 230000035605 chemotaxis Effects 0.000 abstract description 3
- 230000003044 adaptive effect Effects 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/142—Network analysis or design using statistical or mathematical methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/004—Artificial life, i.e. computing arrangements simulating life
- G06N3/006—Artificial life, i.e. computing arrangements simulating life based on simulated virtual individual or collective life forms, e.g. social simulations or particle swarm optimisation [PSO]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the invention relates to the field of communication system design, in particular to a multi-objective optimization design method of a cognitive communication system.
- the present invention proposes a multi-objective optimal design method based on an effective area.
- the design method can ensure that the Pareto optimal solution obtained by optimization is set in the effective area of the system, the convergence speed is fast, and the complex multi-objective optimization problem faced by the current communication system design is effectively solved.
- Cognitive radio has the ability to perceive its own environment, the ability to learn about environmental changes, the ability to mine spectrum resources, and the ability to reconfigure system functions. Applying the cognitive radio technology to the emergency communication system to build a cognitive radio-based emergency communication system-cognitive emergency communication system can meet the requirements of large capacity, high density and low delay of emergency communication systems in emergency scenarios.
- the cognitive emergency communication system Considering that most emergency communication users in the cognitive emergency communication system use rechargeable batteries as the power source, it is difficult to charge at the disaster site, so when designing the cognitive emergency communication system, the main goal of the system design is to achieve emergency communication. Maximize the user's transmission rate while maximizing the life cycle of emergency communication users. This is a typical multi-objective optimization problem for communication systems.
- the third method has been widely used in multi-objective problems dealing with conflicting objectives, such as multi-objective bacterial foraging algorithm and multi-objective particle swarm optimization algorithm.
- multi-objective bacterial foraging algorithm and multi-objective particle swarm optimization algorithm.
- how to ensure that the solution of multi-objective optimization is within the effective area of the communication system to meet the actual scene requirements of the communication system, achieve the global optimum, and further accelerate the convergence speed of the optimization algorithm is a difficult problem that has not been completely solved.
- the present invention proposes a multi-objective optimal design method based on an effective area.
- the design method can ensure that the Pareto optimal solution obtained by optimization is set in the effective area of the system, the convergence speed is fast, and the complex multi-objective optimization problem faced by the current communication system design is effectively solved.
- the present invention adopts the multi-objective optimization design method based on the effective area, and adopts the bacterial foraging algorithm to jointly optimize the multiple design objectives of the communication system by using the optimal design objective function of the communication system as the fitness value of the bacterial trend movement.
- Bacteria swim to the global optimal position using adaptive step size and direction within the set effective area, and at the same time use dynamic retention ratio to continuously update the bacterial colony, and finally obtain the optimal design of the system by finding the best harmonic solution of the bacterial colony Program.
- the method of the invention applies the effective area to the multi-objective optimization design of the communication system, and uses the set effective area to screen the bacteria, so that the bacteria always swim to the global optimal position with an adaptive step size and direction in the set effective area , quickly reach the global optimum, and solve the complex multi-objective optimization design problem faced by the communication system design.
- This can produce the following beneficial effects:
- step size and direction of bacterial trend movement are related to the global optimal bacterial position, which ensures that the multi-objective optimization design scheme of the system is globally optimal;
- the direction of bacterial trend movement is related to the number of bacterial trend operations and the individual historical optimal position of bacteria, which speeds up the algorithm convergence speed;
- the bacterial update adopts the dynamic retention ratio method, which improves the diversity of the multi-objective optimization design scheme of the system
- FIG. 1 is a schematic diagram of the emergency communication system model of the present invention.
- FIG. 2 is a comparison of the convergence of the solution of the present invention and other algorithms.
- Fig. 3 is the design flow chart of the scheme of the present invention.
- FIG. 1 is a schematic diagram of the model of the cognitive emergency communication system of the present invention.
- the cognitive emergency communication system includes at least 3 cognitive emergency users and 2 main users.
- the present invention implements a multi-objective optimization design method based on an effective area, including the following steps:
- Step 1 Determine the system optimization goal
- an appropriate cognitive emergency user transmit power P s is designed to maximize the cognitive emergency communication user's life cycle while maximizing the cognitive emergency user transmission rate.
- f 1 is the optimal design objective function of the cognitive emergency user transmission rate
- f 2 is the optimal design objective function of the cognitive emergency communication user life cycle
- B is the system channel bandwidth
- p 0 is the channel idle probability
- p 1 is the channel busy probability
- P s is the transmit power of the cognitive emergency user
- h ss is the end-to-end power gain of the cognitive emergency user
- h sp is the system cognitive
- Q v is the maximum transmit power of the cognitive emergency user
- P p is the primary user transmit power
- h ps is the interference power gain of the primary user to the cognitive emergency user
- I th is the primary user
- the optimization target number of the system is determined according to the actual communication system requirements, and the more the target number is.
- Step 2 Set the effective area of system optimization design
- the search area for the optimal solution of the system optimization design is set as f 1min ⁇ f 1 ⁇ f 1max , f 2min ⁇ f 2 ⁇ f 2max , the Pareto optimal set of its distribution is set1, and the system is optimized
- the effective area for designing the optimal solution is f 1min ⁇ f 1 ⁇ a, f 2min ⁇ f 2 ⁇ b 2
- the Pareto optimal set of its distribution is set2
- the screening area for the optimal solution of the system optimization design is f 1min ⁇ f 1 ⁇ a, f 2min ⁇ f 2 ⁇ b 1 , b 1 ⁇ b 2
- the Pareto optimal set of its distribution is set3, where f 1min , f 1max , f 2min , and f 2max are the optimal design for system optimization
- the boundary of the solution search area, f 1min , f 2min , a, b 2 are the boundaries of the effective area of the optimal solution of the system optimization design
- the search area, effective area and screening area range are set according to the business characteristics and application scenarios of the actual communication system.
- f 1min -28.5
- f 1max 0
- f 2min -1
- f 2max 0
- a -14
- b 1 -0.65
- b 2 -0.6.
- Step 3 target optimization algorithm selection
- the transmission power P s of the system cognitive emergency user is taken as the position value of the bacterial movement
- the objective functions f 1 and f 2 of the system optimization design are taken as the fitness value F 1 and the fitness value F 2 of the bacterial group (bacteria collection) movement, respectively.
- the bacterial foraging algorithm optimizes the transmit power P s of the cognitive emergency user in the system, and the optimal reconciliation solution of the bacterial motion position obtained is the optimal transmit power of the cognitive emergency user in the emergency communication system.
- the fitness value F 1 and the fitness value F 2 are the fitness value sets of the flora corresponding to the objective functions f 1 and f 2 of the system optimization design, respectively.
- the system target optimization algorithm may adopt the bacterial foraging algorithm, or may adopt other optimization algorithms, such as the ant colony algorithm.
- Step 5 Calculate the bacterial fitness value
- the fitness value of the bacteria is calculated according to the optimization objective of the system, and the fitness value of the bacteria movement is in a one-to-one correspondence with the objective of the system optimization design.
- Step 6 Determine the global optimal bacterial position gbest
- (i) Construct the Pareto optimal set set1 of the search area.
- the selection of the global optimal bacterial position gbest is selected according to the area set in step 2, which directly affects the swimming step length and direction of the bacteria in the chemotaxis operation.
- the swimming step size of bacteria is adaptive, and its size depends on the difference between the global optimal bacterial position gbest selected in step 6 and the current position, which ensures that the bacteria swim to the global optimal position.
- Step 10 If i ⁇ 1, go back to (ii) in step 9.
- Step 11 Update the global optimal bacterial position value gbest
- Step 12 Update the next trend movement direction of all bacteria:
- c 1 , c 2 are the acceleration constants (c 1 , c 2 ⁇ 0) of bacterial tropism movement
- r 1 , r 2 are random numbers in [0,1]
- w is the inertia weight of bacterial tendency to move
- w max is the maximum value of bacterial tendency to move inertia weight
- w min is the minimum value of bacterial tendency to move inertia weight.
- c 1 0.6
- c 2 0.4
- w max 0.9
- w min 0.4.
- the direction of bacterial trend movement is not only related to the global optimal position and the individual historical optimal value, but also to the original trend movement direction of the bacteria, and its weight is related to the number of trends.
- the bacterial replication operation adopts the method of dynamic retention ratio, which improves the diversity and uniformity of the algorithm solution.
- Step 18 Determine the optimal transmit power.
- the location value where the best reconciled bacteria is located is the optimal transmit power for the cognitive emergency user.
- the multi-objective optimization design method of this embodiment is simulated and tested, and the test results are shown in Table 1 and FIG. 2 .
- the number of trending operations adaptively updates the step size and direction of bacterial swimming, which speeds up the convergence of the algorithm and ensures the global optimality of the best harmonic solution.
- the effectiveness of the embodiment of the present invention (the number of bacteria in the Pareto optimal set set2 and the number of bacteria in the Pareto optimal set set1) The ratio of numbers) is increased from 37.59% and 38.65% to 61.18% respectively, and the convergence of the embodiment of the present invention is reduced from more than 2000 iterations to about 500 iterations. It can be seen that, compared with the existing multi-objective optimization design method, the embodiment of the present invention significantly improves the effectiveness and convergence of the Pareto optimal set of the algorithm.
- the invention is applicable to the system of multi-objective optimal design and also to the system of single-objective optimal design.
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Abstract
Description
平均值 | 本发明方案 | 多目标细菌觅食算法 | 多目标粒子群算法 |
set1 | 245.35 | 247.25 | 175.8 |
set2 | 148.7 | 92.9 | 67.9 |
比值 | 0.6118 | 0.3759 | 0.3865 |
Claims (7)
- 基于有效区域的多目标优化设计方法,所述通信系统中至少包括1个认知应急用户和1个主用户,认知应急用户有数据业务要传输,其特征在于所述多目标优化设计方法包括如下步骤:步骤1、确定系统优化目标根据下式设计认知应急用户发射功率P s:式中,f 1为认知应急用户传输速率的优化设计目标函数,f 2为认知应急通信用户生命周期的优化设计目标函数,B为系统信道带宽, 为系统信道高斯噪声功率,p 0为信道空闲概率,p 1为信道忙碌概率,P s为认知应急用户发射功率,h ss为认知应急用户端到端功率增益,h sp为系统认知应急用户对主用户的干扰功率增益,Q v为认知应急用户的最大发射功率,P p为主用户发射功率,h ps为主用户对认知应急用户的干扰功率增益,I th为主用户接收机的干扰门限;步骤2、设置系统优化设计有效区域设置系统优化设计最优解的搜索区域为f 1min≤f 1≤f 1max,f 2min≤f 2≤f 2max,其分布的帕累托最优集为set1,系统优化设计最优解的有效区域为f 1min≤f 1≤a,f 2min≤f 2≤b 2,其分布的帕累托最优集为set2,系统优化设计最优解的筛选区域为f 1min≤f 1≤a,f 2min≤f 2≤b 1,b 1≤b 2,其分布的帕累托最优集为set3,其中f 1min、f 1max、f 2min、f 2max为系统优化设计最优解搜索区域的边界,f 1min、f 2min、a、b 2为系统优化设计最优解的有效区域的边界,f 1min、f 2min、a、b 1为系统优化设计最优解的筛选区域的边界;步骤3、目标优化算法选取将系统认知应急用户的发射功率P s作为细菌运动的位置值,系统优化设计目标函数f 1和f 2分别作为菌群运动的适应值F 1和适应值F 2,选取细菌觅食算法对系统认知应急用户的发射功率P s进行优化,所得的细菌运动位置的最佳调和解就是应急通信系统中认知应急用户的最佳发射功率;其中,适应值F 1和适应值F 2分别是菌群对应于系统优化设计目标函数f 1和f 2的适应值集合;步骤4、初始化假设有I个细菌参与觅食优化算法,构成细菌集合set,对集合set中的每个细菌进行编号,在可行区域[0,Q v]范围内随机生成每个细菌的初始位置 在-1和1之间随机生成每个细菌的初始运动方向Δ(i),i=1,2,3,…,I;设细菌泳动的最大步数为N s,细菌的最大趋向 次数为N c,细菌的最大复制次数为N re,细菌的最大迁移次数为N ed,迁移概率为P ed;步骤5、计算细菌适应值步骤6、确定全局最优细菌位置gbest(i)构建搜索区帕累托最优集set1,在细菌集合set中两两比较细菌的适应值,如果细菌i的两个适应值 和 都不大于且不同时等于细菌m的两个适应值 和 i=1,2,...,I,m=1,2,...,I且m≠i,那么细菌m被细菌i支配,将细菌m丢弃,在剩余的细菌中重复这样的细菌适应值比较,直到被其它细菌支配的细菌都被丢弃,最后由这些剩余的非支配细菌构成搜索区域中分布的帕累托最优集set1;(ii)对集合set1中的所有细菌进行编号,编号为n,n=1,2,...,N,N为集合set1中细菌的个数;(iii)根据细菌适应值F 1的大小,对集合set1中细菌按升序进行排序,构成新的集合set1 1,并按升序对set1 1中的所有细菌进行重新编号,编号为u,u=1,2,...,N,同时保留细菌在集合set1中的编号n;(iv)根据细菌适应值F 1计算集合set1 1中细菌u,u=2,3,...,N-1,与它前后两个细菌的间隔(v)根据细菌适应值F 2的大小,对集合set1中细菌按升序进行排序,构成新的集合set1 2,并按升序对set1 2中的所有细菌进行重新编号,编号为v,v=1,2,...,N,同时保留细菌在集合set1中的编号n;(vi)根据细菌适应值F 2计算集合set1 2中细菌v,v=2,3,...,N-1,与它前后两个细菌的间隔(viii)根据细菌的拥挤距离大小,对集合set1中细菌按降序进行排序;(x)选择最优集set3中拥挤距离前10%的个体组成集合gbestpool,从集合gbestpool中随机选择一个细菌的位置作为全局最优细菌位置gbest;步骤7、细菌迁移令l=1,在集合set中对所有细菌执行迁移操作;步骤8、细菌复制令k=1,在集合set中对所有细菌执行复制操作;步骤9、细菌趋向令j=1,集合set中所有细菌执行趋向操作;(i)令i=0,细菌i泳动;(iii)细菌泳动,细菌i泳动一次,更新其位置:(iv)边界控制,检查细菌i是否在可行区域内(vii)如果sn<N s,返回步骤9中的(iii);(viii)选取细菌i的个体历史最优值pbest i比较细菌i在趋向操作前后的适应值,如果细菌i在趋向操作后的两个适应值f 1 i和 都不大于且不同时等于细菌i在趋向操作前的适应值 和 那么此时细菌i的位置就是个体历史最优值pbest i,即 如果细菌i在趋向操作前的两个适应值 和 都不大于且不同时等于细菌i在趋向操作后的适应值f 1 i和 那么细菌i在趋向操作前的位置就是个体历史最优值pbest i,即pbest i=P old;否则,细菌i在 和P old之间等概随机选择其中的一个作为其个体历史最优值pbest i;步骤10、如果i<I,返回步骤9中的(ii);步骤11、更新全局最优细菌位置值gbest(i)更新搜索区中帕累托最优集set1在细菌集合set中两两比较细菌的适应值,如果细菌i的两个适应值f 1 i和 都不大于且不同时等于细菌m的两个适应值f 1 m和 i=1,2,...,I,m=1,2,...,I且m≠i,那么细菌m被细菌i支配,将细菌m丢弃,在剩余的细菌中重复这样的细菌适应值比较,直到被其它细菌支配的细菌都被丢弃,最后由这些剩余的非支配细菌构成搜索区域中分布的帕累托最优集set1;(ii)对集合set1中的所有细菌进行编号,编号为n,n=1,2,...,N,N为集合set1中细菌的个数;(iii)根据细菌适应值F 1的大小,对集合set1中细菌按升序进行排序,构成新的集合set1 1,并按升序对set1 1中的所有细菌进行重新编号,编号为u,u=1,2,...,N,同时保留细菌在集合set1中的编号n;(iv)根据细菌适应值F 1计算集合set1 1中细菌u,u=2,3,...,N-1,与它前后两个细菌的间隔(v)根据细菌适应值F 2的大小,对集合set1中细菌按升序进行排序,构成新的集合set1 2, 并按升序对set1 2中的所有细菌进行重新编号,编号为v,v=1,2,...,N,同时保留细菌在集合set1中的编号n;(vi)根据细菌适应值F 2计算集合set1 2中细菌v,v=2,3,...,N-1,与它前后两个细菌的间隔(viii)根据细菌的拥挤距离大小,对集合set1中细菌按降序进行排序;(x)选择最优集set3中拥挤距离前10%的个体组成集合gbestpool,从集合gbestpool中随机选择一个细菌的位置作为全局最优细菌位置gbest;步骤12、更新所有细菌的下一次趋向运动方向:其中i=1,2,...,I,c 1、c 2为细菌趋向运动的加速常数(c 1,c 2≥0),r 1、r 2为[0,1]内的随机数,w为细菌趋向运动的惯性权重,w max为细菌趋向运动惯性权重的最大值,w min为细菌趋向运动惯性权重的最小值;步骤13、如果j<N c,令j=j+1,返回步骤9中的(i),对所有细菌继续执行下一轮趋向操作;否则结束本轮趋向操作,进入复制操作;步骤14、复制操作(i)根据细菌的适应值计算细菌集set中所有细菌的健康值J 1health、J 2health和J health,细菌i的健康值分别为:其中i=1,2,...,I。(ii)更新细菌集set将细菌集合set中的细菌按其健康值J 1health进行升序排列,选择其中的前50%-t个体组成pop 1;将细菌集合set中的细菌按其健康值J 2health升序排列,选择其中的前t个体组成;将细菌集合set中的细菌按其健康值J health升序排列,选择其中的前50%个体组成pop 3。更新后的细菌集set由集合pop 1、pop 2和pop 3合并构成,其中 λ为共同调节系数以保证在第一次复制时,即k=1时,t的值为0.25;步骤15、如果k<N re,令k=k+1,返回到步骤9,对所有细菌执行下一轮趋向操作;否则结束本轮复制操作,进入迁移操作;步骤16、迁移操作(i)细菌集set中每个细菌均以概率P ed离开集合set而消失,同时在可行区域[0,Q v]范围内随机生成与消失细菌数量相同的细菌加入细菌集set,保持细菌总数稳定,如果l<N ed,令l=l+1,返回到步骤8,对所有细菌执行下一轮复制操作和趋向操作;否则结束迁移操作。步骤17、选取最佳调和解(i)根据细菌适应值对帕累托最优集set1中的细菌进行筛选,保留适应值在有效区域(f 1min≤f 1≤a且f 2min≤f 2≤b 2)内的细菌,得到有效区域中分布的帕累托最优集set2,并对集合set2中的所有细菌重新编号,编号为m,m=1,2,...,M,M为集合set2中的细菌个数;(ii)计算帕累托最优集set2中第m个细菌的隶属度其中(iii)在帕累托最优集set2中选取隶属度最大的细菌作为细菌觅食算法的最佳调和解;步骤18、确定最佳发射功率最佳调和解细菌所在的位置值就是认知应急用户的最佳发射功率。
- 根据权利要求1所述基于有效区域的多目标优化设计方法,其特征在于:步骤2中,系统优化设计的搜索区域、有效区域和筛选区域是根据实际通信系统的业务特性和应用场景而设置的。
- 根据权利要求1所述基于有效区域的多目标优化设计方法,其特征在于:步骤3中,系统目标优化算法采用细菌觅食算法或蚁群算法。
- 根据权利要求1所述基于有效区域的多目标优化设计方法,其特征在于:步骤5中,细菌的适应值根据系统优化设计目标函数计算获得,细菌运动的适应值与系统优化设计的目标是一一对应的。
- 根据权利要求1所述基于有效区域的多目标优化设计方法,其特征在于:步骤6中,全局最优细菌位置gbest根据步骤2中设置的区域进行筛选选取。
- 根据权利要求1所述基于有效区域的多目标优化设计方法,其特征在于:步骤9中,细菌的泳动步长是自适应的,其大小取决于步骤6中选取的全局最优细菌位置gbest与当前位置差值。
- 根据权利要求1所述基于有效区域的多目标优化设计方法,其特征在于:步骤14中,细菌的复制操作采用了动态保留比例的方法。
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