Analisis Persediaan Suku Cadang Alat Bongkar Muat Petikemas dengan Vendor Managed Inventory - Consignment Stock

Zahra, Farah Afada (2025) Analisis Persediaan Suku Cadang Alat Bongkar Muat Petikemas dengan Vendor Managed Inventory - Consignment Stock. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Terminal penyedia jasa bongkar muat peti kemas menghadapi tantangan dalam pengelolaan persediaan suku cadang untuk alat seperti container crane, reach stacker, dan khususnya head truck. Penelitian ini menerapkan pendekatan Vendor managed inventory (VMI) dengan consignment stock (CS) dan menggunakan simulasi Monte Carlo. Tahap awal dilakukan klasifikasi suku cadang head truck sebanyak 1.036 item menggunakan metode ABC, FSN, dan ADI-CV. Hasil klasifikasi menunjukkan 40 item kategori A, 170 B, dan 826 C; kemudian 49 fast-moving, 112 slow-moving, dan 875 non-moving. Dari kategori non-nonmoving, diperoleh 11 smooth, 77 intermittent, 73 erratic, dan tidak ada lumpy. Sebanyak 12 suku cadang terpilih mewakili berbagai karakteristik untuk disimulasikan. Masing-masing item disimulasikan dengan kombinasi nilai min dan maks eksisting, serta 12 kombinasi nilai min maks, menggunakan pendekatan continuous review (s,S), periodic review (R,s,S), dan base stock (S-1,S). Simulasi menunjukkan bahwa kombinasi min–maks eksisting memang mampu memberikan service level tinggi, namun dengan total cost yang sangat besar. Berbagai skenario kombinasi nilai min–maks diuji menggunakan metode continuous review, periodic review (dengan berbagai interval), dan base stock policy. Hasilnya, continuous review paling sesuai untuk suku cadang fast moving dengan permintaan smooth atau erratic. Untuk slow moving, periodic review memberikan total cost lebih rendah, sementara base stock policy cocok untuk permintaan sangat rendah (1–3 unit/tahun). Penerapan VMI-CS menurunkan holding cost pembeli hingga 88% karena kepemilikan barang tetap di pemasok hingga digunakan. Pembeli hanya menanggung biaya gudang, sedangkan pemasok menanggung capital cost. Sistem ini juga meningkatkan service level mendekati 100% dan menurunkan risiko stockout karena lead time internal hampir nol, berbeda dengan sistem konvensional yang rawan keterlambatan karena proses panjang. Simulasi menunjukkan total cost pembeli dan pemasok lebih rendah dengan penyesuaian min–maks dan metode persediaan, rata-rata turun 38%. Beban modal tinggi yang ditanggung pihak pemasok dapat mempertimbangkan penyesuaian harga menunjukkan kenaikan rata-rata 4,93%, dan disarankan dalam kontrak untuk mengatur kewajiban pembeli terhadap sisa stok di akhir masa kontrak, untuk mencegah risiko kerugian logistik, penurunan kualitas, dan beban penyimpanan pada pemasok.
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Container terminal service providers face significant challenges in managing spare parts inventory for equipment such as container cranes, reach stackers, and particularly head trucks. This study applies a Vendor Managed Inventory (VMI) approach with Consignment Stock (CS), utilizing Monte Carlo simulation. In the initial stage, 1,036 head truck spare parts were classified using ABC, FSN, and ADI-CV methods. The classification results identified 40 items as category A, 170 as B, and 826 as C; 49 items as fast-moving, 112 as slow-moving, and 875 as non-moving. Further classification of the non-nonmoving items revealed 11 smooth, 77 intermittent, 73 erratic, and no lumpy demand patterns. Twelve representative spare parts were selected for simulation based on their varying characteristics. Each item was simulated using both existing min–max values and 12 alternative min–max combinations, across three inventory control methods: continuous review (s,S), periodic review (R,s,S), and base stock (S–1,S). The simulation results indicate that while existing min–max settings may achieve high service levels, they incur significantly high total costs. Among the tested approaches, continuous review proved most suitable for fast-moving items with smooth or erratic demand. For slow-moving items, periodic review yielded lower total costs, while base stock policy was optimal for items with very low demand (1–3 units per year). The implementation of the VMI-CS system reduced buyer holding costs by up to 88%, as inventory ownership remains with the supplier until use. Buyers only incur warehouse storage costs, while suppliers bear the capital cost burden. The system also improved service level approaching 100% and reduced stockout risks due to near-zero internal lead time, unlike conventional systems that are prone to delays from lengthy procurement processes. Simulation results also show that total costs for both buyers and suppliers decrease by an average of 38% with optimized min–max settings and inventory methods. Due to the high capital burden borne by suppliers, price adjustments may be justified, with simulations indicating an average increase of 4.93%. It is recommended that contracts include provisions requiring buyers to purchase any remaining stock at the end of the contract period to mitigate risks of logistical losses, quality degradation, and supplier inventory costs.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	persediaan suku cadang, stok konsinyasi, vendor managed inventory, consignment stock, spare part inventory
Subjects:	Q Science > QA Mathematics > QA76.9.D37 Data warehousing.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26201-(S1) Undergraduate Thesis
Depositing User:	Farah Afada Zahra
Date Deposited:	29 Jul 2025 14:13
Last Modified:	29 Jul 2025 14:13
URI:	http://repository.its.ac.id/id/eprint/123931

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