模拟退火的SAW木工开料优化排版C#代码
时间: 2023-10-19 16:04:23 浏览: 37
以下是一个简单的模拟退火算法的SAW木工开料优化排版的C#代码:
```csharp
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SAWWoodcuttingOptimization
{
class Program
{
static void Main(string[] args)
{
int[] board = { 10, 12, 14, 16 }; // 定义木板尺寸
int[] wood = { 2, 3, 4 }; // 定义木材尺寸
// 初始化随机解
int[] solution = new int[wood.Length];
Random rand = new Random();
for (int i = 0; i < solution.Length; i++)
{
solution[i] = rand.Next(0, board.Length);
}
// 初始化温度和退火系数
double temperature = 100.0;
double coolingRate = 0.03;
// 迭代直到温度降到0
while (temperature > 0.1)
{
// 随机生成相邻解
int[] neighbor = new int[solution.Length];
Array.Copy(solution, neighbor, solution.Length);
int index = rand.Next(0, neighbor.Length);
neighbor[index] = rand.Next(0, board.Length);
// 计算当前解和相邻解的代价函数值
int currentCost = CostFunction(solution, board, wood);
int neighborCost = CostFunction(neighbor, board, wood);
// 如果相邻解更优,则接受它
if (neighborCost < currentCost)
{
solution = neighbor;
}
// 否则以一定概率接受它
else
{
double acceptanceProbability = Math.Exp(-(neighborCost - currentCost) / temperature);
if (rand.NextDouble() < acceptanceProbability)
{
solution = neighbor;
}
}
// 降低温度
temperature *= 1 - coolingRate;
}
// 输出最终结果
Console.WriteLine("Optimal Solution:");
for (int i = 0; i < solution.Length; i++)
{
Console.WriteLine("Wood {0} on Board {1}", i + 1, solution[i] + 1);
}
Console.WriteLine("Total Cost: {0}", CostFunction(solution, board, wood));
Console.ReadKey();
}
// 计算代价函数值
static int CostFunction(int[] solution, int[] board, int[] wood)
{
int[] boardLengths = new int[board.Length];
for (int i = 0; i < solution.Length; i++)
{
boardLengths[solution[i]] += wood[i];
}
int totalCost = 0;
for (int i = 0; i < board.Length; i++)
{
totalCost += Math.Abs(board[i] - boardLengths[i]);
}
return totalCost;
}
}
}
```
在这个示例中,我们假设有4种长度为10、12、14和16的木板,和3种长度为2、3和4的木材需要切割。我们的目标是将这些木材排列在木板上,使得每个木板的浪费最小。我们使用模拟退火算法来寻找最优解。
首先,我们随机初始化一个解。然后,我们以一定的温度开始迭代,生成相邻解并计算它们的代价函数值。如果相邻解更优,则接受它。否则,以一定概率接受它。在每次迭代中,我们都会降低温度,直到温度降到0.1为止。最终,我们输出最优解和代价函数值。
在代价函数中,我们将每个木板上的木材长度相加,然后计算与木板长度的差值的绝对值之和。这个值就是我们的代价函数值。