当前位置：首页 > news >正文

基于MATLAB的禁忌搜索算法解决物流网络枢纽选址问题

news 2025/10/11 11:30:35

一、问题建模

1. 数学模型

目标函数：最小化总成本（建设成本+运输成本）

\(S\)：选中的枢纽集合
\(C_i\)：候选点i的建设成本
\(w_{kj}\)：需求点k到枢纽j的货物量
\(d_{ik}\)：候选点i到需求点k的距离
\(x_{ijk}\)：需求点\(k\)是否通过枢纽i运输

约束条件：

选中枢纽数量约束：\(∣S∣=p\)
每个需求点仅分配一个枢纽：
非负流量约束：\(x_{ijk}≥0\)

二、核心代码

1. 数据准备与初始化

function [nodes, demands] = load_data()% 加载候选节点坐标和需求点数据% 示例：20个候选枢纽，100个需求点nodes = rand(20,2)*100;  % 候选枢纽坐标demands = [randi([1,50],100,1), rand(100,2)*100];  % [需求量,坐标]
end% 参数设置
p = 5;          % 选中枢纽数量
num_iter = 500; % 最大迭代次数
tabu_tenure = 10; % 禁忌长度

2. 距离矩阵计算

function D = calc_distance(nodes, demands)% 计算枢纽-需求点距离矩阵num_hubs = size(nodes,1);num_demands = size(demands,1);D = zeros(num_hubs, num_demands);for i = 1:num_hubsfor j = 1:num_demandsD(i,j) = norm(nodes(i,:) - demands(j,2:3));endend
end

3. 禁忌搜索算法主体

function [best_solution, best_cost] = tabu_search(nodes, demands, p, num_iter, tabu_tenure)% 初始化[num_hubs, ~] = size(nodes);[num_demands, ~] = size(demands);% 初始解：随机选择p个枢纽current_sol = randperm(num_hubs, p);current_cost = calculate_cost(current_sol, nodes, demands);% 初始化禁忌表tabu_list = containers.Map('KeyType','char','ValueType','double');best_solution = current_sol;best_cost = current_cost;for iter = 1:num_iter% 生成邻域解neighbors = generate_neighbors(current_sol, num_hubs);% 评估邻域解for i = 1:size(neighbors,1)neighbor = neighbors(i,:);if ~is_tabu(neighbor, tabu_list)cost = calculate_cost(neighbor, nodes, demands);if cost < best_costbest_solution = neighbor;best_cost = cost;end% 更新禁忌表tabu_key = mat2str(neighbor);tabu_list(tabu_key) = iter + tabu_tenure;endend% 更新当前解current_sol = neighbors(1,:);current_cost = calculate_cost(current_sol, nodes, demands);end
end

4. 辅助函数

function cost = calculate_cost(solution, nodes, demands)% 计算总成本（建设+运输）p = length(solution);total_cost = 0;% 建设成本C = [5,4,5,6,3,6,4,5,4,6,4,5,4,6,5]; % 示例建设成本total_cost = sum(C(solution));% 运输成本D = calc_distance(nodes, demands);for k = 1:size(demands,1)[~, idx] = min(D(solution,k));total_cost = total_cost + D(solution(idx),k) * demands(k,1);end
endfunction neighbors = generate_neighbors(solution, num_hubs)% 生成邻域解（通过交换两个枢纽）neighbors = [];for i = 1:length(solution)for j = 1:length(solution)if i ~= jneighbor = solution;neighbor(i) = solution(j);neighbor(j) = solution(i);neighbors = [neighbors; neighbor];endendendneighbors = unique(neighbors,'rows');
endfunction is_tabu = is_tabu(solution, tabu_list)% 检查解是否在禁忌表中key = mat2str(solution);is_tabu = isKey(tabu_list, key);
end

三、算法优化

1. 邻域结构改进

变邻域搜索：结合交换、插入、反转操作

function neighbors = vns(solution, num_hubs)% 变邻域搜索生成neighbors = [];% 交换操作for i = 1:length(solution)-1for j = i+1:length(solution)neighbor = solution;[neighbor(i), neighbor(j)] = deal(neighbor(j), neighbor(i));neighbors = [neighbors; neighbor];endend% 插入操作for i = 1:length(solution)for j = 1:length(solution)if i ~= jneighbor = [solution(1:i-1), solution(j), solution(i:j-1), solution(j+1:end)];neighbors = [neighbors; neighbor];endendend
end

2. 多目标优化扩展

function [f1,f2] = multi_objective(solution, nodes, demands)% 多目标函数：成本+碳排放[f1, ~] = calculate_cost(solution, nodes, demands);% 碳排放计算distances = calc_distance(nodes, demands);for k = 1:size(demands,1)[~, idx] = min(distances(solution,k));f2 = f2 + 0.5 * distances(solution(idx),k) * demands(k,1); % 碳强度系数0.5end
end

参考代码在MATLAB平台，实现利用禁忌搜索算法，解决物流网络的枢纽选址问题 www.youwenfan.com/contentcni/64659.html

四、性能评估与可视化

1. 收敛曲线分析

function plot_convergence(best_costs)figure;plot(best_costs, 'LineWidth', 2);xlabel('迭代次数'); ylabel('最优成本'); title('禁忌搜索收敛曲线');grid on;
end

2. 结果可视化

function visualize_solution(nodes, solution)figure;hold on;% 绘制候选枢纽plot(nodes(:,1), nodes(:,2), 'bo', 'MarkerSize', 10);% 绘制选中枢纽selected = nodes(solution,:);plot(selected(:,1), selected(:,2), 'rx', 'MarkerSize', 12, 'LineWidth', 2);% 绘制需求点demand_points = demands(:,2:3);plot(demand_points(:,1), demand_points(:,2), 'go', 'MarkerSize', 8);legend('候选枢纽', '选中枢纽', '需求点');title('物流网络枢纽选址结果');hold off;
end

该方案通过禁忌搜索算法有效解决了物流网络枢纽选址问题，在保证解质量的同时显著降低计算复杂度。

查看全文

http://www.hskmm.com/?act=detail&tid=28523