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USULAN PERBAIKAN SISTEM PERSEDIAAN UNTUK MINIMASI BIAYA TOTAL PERSEDIAAN PADA PT. SEMARANG AUTOCOMP MANUFACTURING INDONESIA

*Sri Hartini  -  Industrial Engineering Departement Diponegoro University , Indonesia
Heru Prastawa  -  Industrial Engineering Departement Diponegoro University , Indonesia
Sitoarum Jayaningtyas  -  Industrial Engineering Departement Diponegoro University , Indonesia

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Abstract

Sistem pemesanan produk dari customer mengijinkan adanya revisi demand dengan fluktuasi
yang telah disepakati. Sistem persediaan PT. SAMI selama ini belum dapat mengakomodasi perubahan
demand tersebut. Sering terjadi shortage dan overstock yang berpengaruh pada besarnya biaya total
persediaan yang harus dikeluarkan. Minimasi biaya total persediaan dapat dicapai dengan peramalan
demand aktual dan sistem persediaan yang tepat. Saat ini PT. SAMI tidak melakukan peramalan untuk
memperoleh perkiraan demand aktual. Perkiraan kebutuhan produksi dan sistem pemesanan materialnya
hanya berdasarkan pada perkiraan demand dari customer tanpa pertimbangan apapun dengan
menganggap bahwa fluktuasi perkiraan demand dari customer dalam batas yang telah disepakati. Melalui
identifikasi pola data masa lalu, diusulkan 5 metode peramalan dan metode Winter Eksponential
Smoothing (WES) mempunyai tingkat error paling kecil. Selanjutnya metode WES yang terpilih. Selain
itu, diusulkan 3 alternatif dalam sistem pemesanan, yaitu perbaikan perkiraan demand, sistem order up tolevel
dan sistem optional replenishment. Ketiganya mampu menurunkan biaya total masing-masing
18,81%, 22,55%, 23,58%.
Kata kunci: biaya total persediaan, peramalan, order up to-level, optional replenishment

 


The product ordering system from customer is allowing for demand revision with the fluctuation
which has been agreed before. The inventory system that now day PT. SAMI run couldn’t accommodate
those demand change. There’s often happen shortage & over stock which impact on the total inventory
cost that PT. SAMI have to spend. Minimalisation of total inventory cost could be achieved with the
effective actual demand forecasting and inventory system. Today PT. SAMI is not conducts forecasting to
get the actual demand forecast. The production requirement forecast and material order system is based
only on demand forecast from supplier without any consideration and PT SAMI just assume that demand
forecast fluctuation from customer is still within range of agreement that have been approved. Through
past data pattern identification, we tried 5 method and we can get Winter Exponential Smoothing
forecasting method proposal with better degree of accuracy than the current demand forecast method.
Besides,this article proposes 3 alternatives in ordering system, such as demand forecast improvement, up
to-level order system and optional replenishment system. Three of them could cut the total cost down until
18,81%, 22,55%, 23,58%.
Keyword: Total inventory cost, forecasting, up to-level order, optional replenishment.

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Section: Case Studies
Language : EN
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