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【工具开发】用Excel复现ASML备件预测模型

【工具开发】用Excel复现ASML备件预测模型

为啥要折腾这个?

上一篇【经典导读】ASML基于Installed base的备件销售预测讲了ASML怎么用“Installed base”信息预测备件需求。按照本人的一贯做法,学了新方法,要验证后才真正算自己的。而验证方案最便捷的就是用Excel,抛开大数据量运算性能的问题,Excel叠加算法&VBA编程能力,堪称方案验证的神器。

下面我把自己验证过的步骤再捋一遍,大家照着做就行。

ASML方案的核心思路

预测需求 = 所有在用的备件 × 它们近期坏掉的概率

公式中“坏掉的概率”用威布尔分布算比较适配备件预测模型,需要不断调整两个参数β和η取值,以实现威布尔分布最逼近真实的概率分布。

从论文原文中我们知道,威布尔分布方法有两种模型:“基于寿命的方法和“基于需求方法”;考虑到真实场景下的数据可得性,我们选择基于需求的方法进行验证。

基于需求的方法”的意思就是:用历史耗用数据反推这两个参数,使基于这两个参数计算出的预测最接近真实的耗用。

具体验证步骤

1. Excel里创建4个数据表

  • Params表放参数(β、η、预测月数);

  • InstalledBase放各月各年龄段的装机数量;

  • Actual放历史实际耗用(需求);

  • Evaluation用于计算误差

1)Params表:

维护威布尔分布相关的几个关键参数信息:

可以给B2、B3、B4起个名字:选中B2 → 左上角名称框输入 i_val → 回车;同样,B3输入 beta_val,B4输入 eta_val。下图为选中B2后,设置i_val的示例。

这样做的好处是,eta_val可以在其他表里全局引用,公式里可以直接写eta_val,不用写 =$B$4,清爽多了。

2)InstalledBase表:

按如下方式维护Installed base数据表,Age_0至Age10,表示在装机使用状态下最大寿命为10个月的备件数量;p_0至P_10,表示利用威布尔分布公式计算得到的近期坏掉的概率;

p_0=1-EXP((0/eta_val)^beta_val-((0+i_val)/eta_val)^beta_val )

p_1=1-EXP((1/eta_val)^beta_val-((1+i_val)/eta_val)^beta_val )

....依次类推,直至计算P_10

Pridicted=SUMPRODUCT(B2:L2, M2:W2)

预测数据:

选择相同的公式,只是最大寿命数据可能会增加一个月,出现P_11;

3)Actual历史实际耗用表

By月度统计备件的历史耗用(需求)。

4)Evaluation表

SME=SUM(D2:D8)/SUM(B2:B8)

MAE_model=AVERAGE(E2:E8)

MAE_naive=AVERAGE(ABS(Actual!B3:B25 - Actual!B2:B24))

MASE=MAE_model / MAE_naive

2. 利用Solver自动找最优参数(β&η

在Params表单创建目标函数min(ABS(SME) + MASE)

然后再Solver中设置如下参数设置,点击“求解”,计算得出最优参数β&η

优化前后对比(示例)

参数组
β
η
SME
MASE
瞎填的
1.2
20
0.71
21.30
优化后
0.57.14≈00.85
从21倍误差降到0.85倍,效果很明显。
3. 用最优参数预测未来

假设现在是23-07月底,想预测23-08月。

统计23-08月的备件Installed Base分布:

用最优参数(β=0.5, η=7.14)算条件概率p_0至p_11:

计算23-08月的需求预测=∑(数量 × 概率) = 19.76 ≈ 20件

总结:

这套备件预测方法落地门槛不高,企业只需做好两项基础数据记录:各品类备件月度寿命分布、月度历史消耗数据;然后选择相对简单的模型算法就能达到不错的效果。当前国产化设备装机规模快速攀升的场景下,这套方法适配性和实用价值都很高。

唯一需要注意的是,出保设备的真实寿命数据较难直接从 Fab 获取,后续还需与客户协同配合、共建数据机制才能落地。


👉 关注公众号,后台发消息:“ASML”,即可自动领取下载原论文。

相关文章:

【经典导读】ASML基于Installed base的备件销售预测

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  1. CONNECT:[ UseTime:0.000666s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000769s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000316s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000261s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000521s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000541s ]
  8. SELECT * FROM `article` WHERE `id` = 577393 LIMIT 1 [ RunTime:0.002427s ]
  9. UPDATE `article` SET `lasttime` = 1777947748 WHERE `id` = 577393 [ RunTime:0.002076s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000275s ]
  11. SELECT * FROM `article` WHERE `id` < 577393 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000521s ]
  12. SELECT * FROM `article` WHERE `id` > 577393 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000387s ]
  13. SELECT * FROM `article` WHERE `id` < 577393 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000668s ]
  14. SELECT * FROM `article` WHERE `id` < 577393 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002042s ]
  15. SELECT * FROM `article` WHERE `id` < 577393 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003862s ]
0.098322s