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Kulsum Kulsum
Jurusan Studi Teknik Industri, Fakultas Teknik, Universitas Sultan Ageng Tirtayasa
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Penjadwalan distribusi produk dengan metode distribution requirement planning (Studi kasus produk air minum dalam kemasan) Kulsum Kulsum; Yusraini Muharni; Mochamad Rifky Mulyawan
Jurnal Teknika Vol 16, No 1 (2020): Edisi Juni 2020
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v16i1.7800

Abstract

Studi kasus dilakukan di bidang produksi air minum dalam kemasan, produk yang diteliti adalah air minum kemasan cup berisi 240 ml. Permasalahan yang cukup sering terjadi di perusahaan ini adalah perusahaan mengalami keterlambatan dalam pengiriman produk ke salah satu DC (distribution center) karena tidak tersedianya produk jadi di dalam gudang pusat yang kosong sehingga pemenuhan permintaan konsumen di salah satu DC terganggu. Permasalahan tersebut ternyata terjadi karena kurang terintegrasinya proses pendistribusian produk ke setiap DC diakibatkan oleh perencanaan dan penjadwalan distribusi produk yang belum tersusun secara sistematis oleh perusahaan. Hal itu mengakibatkan biaya distribusi tambahan yang harus dikeluarkan perusahaan apabila pengiriman yang dilakukan melebihi kapasitas truk yang ada. Tujuan penelitian ini adalah menyelesaikan masalah tersebut menggunakan metode distribution requirement planning atau DRP. DRP sangat efektif diterapkan dalam saluran distribusi bertingkat karena metode tersebut dapat membantu merencanakan stock barang di setiap DC. Pada penelitian ini data diolah dalam beberapa langkah yaitu melakukan peramalan permintaan, menentukan safety stock dan order quantity dengan metode lot sizing LFL (lot for lot) dan EOQ (economic order quantity), serta membuat usulan penjadwalan DRP untuk periode satu tahun mendatang. Didapatkan total biaya distribusi DRP dengan LFL mengalami penurunan sebesar 3.12% dengan frekuensi pengiriman lebih sedikit yaitu 52 kali. The case study was carried out in producing bottled water. The product being investigated was a 240 ml cup of bottled drinking water. The problem that is quite common in this company is the company experiencing delays in sending products to one of the DC (distribution center) due to the unavailability of finished products in an empty central warehouse so that the fulfillment of consumer demand in one of the DCs is disrupted. The problem turned out to occur because of the lack of integration of the product distribution process to each DC caused by planning and scheduling product distribution that the company has not systematically arranged. This problem results in additional distribution costs incurred by the company if the shipments made exceed the capacity of the existing trucks. The purpose of this study is to solve the problem using the distribution requirements planning or DRP method. DRP is very effective in multilevel distribution channels because this method can help plan the stock of goods in each DC. In this study, the data is processed in several steps, namely forecasting demand, determining safety stock and order quantity using the lot sizing method LFL (lot for lot) and EOQ (economic order quantity), and making proposed DRP scheduling for the next one year period. Obtained the total cost of distribution of DRP with LFL decreased by 3.12%, with 52 times fewer delivery frequencies.
Usulan pengoptimalan tata letak gudang W12 menggunakan kebijakan dedicated storage dengan penerapan simulasi (Studi kasus: PT. XYZ) Kulsum Kulsum; Yusraini Muharni; Al-Atur Akbar Felayani
Jurnal Teknika Vol 16, No 2 (2020): Edisi November 2020
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v16i2.9177

Abstract

PT. XYZ memiliki gudang baru yaitu warehouse 12. Warehouse 12 ini belum memiliki pengaturan mengenai tata letak bahan baku. Adapun bahan baku yang dimaksud adalah bahan baku plate, sheet dan coil, serta material handling-nya yaitu forklift dan truk trailer. Agar menghindari kekeliruan saat penyusunan dan penempatan, diperlukan penempatan yang sifatnya tetap. Oleh karenanya metode dedicated storage digunakan pada penelitian ini. Dari tata letak tersebut diperlukan perbandingan dari kondisi eksisting dan 2 alternatif usulan untuk mengetahui alternatif terbaik agar mendapatkan layout optimal, dan juga diperlukan simulasi menggunakan ProModel untuk perbandingan terkait utilitasnya. Penempatan bahan baku plate, sheet dan coil di warehouse 12 berdasarkan kebijakan dedicated storage dari perbandingan antara throughput dengan space requirement menghasilkan urutan dari yang terbesar sampai terkecil yaitu P2 – P4 – S4 – S3 – S2 – S5 – C4 – P1 – C1 – C5 – P5 – S1 – P3 – C2 – C3. Jumlah biaya material handling pada warehouse 12 berdasarkan kebijakan dedicated storage dengan masing-masing kondisi eksisting, diperoleh total biaya material handling sebesar Rp 2.825.467.122,19 dan untuk kondisi usulan 1 diperoleh total biaya material handling sebesar Rp 2.310.973.601,76 serta untuk kondisi usulan 2 diperoleh total biaya material handling sebesar Rp 142.795.485,50. 5. Persentase utilitas penggunaan alat material handling efisien pada warehouse 12, dimana untuk kondisi eksisting utilitas forklift 1 sebesar 99,86%, forklift 2 sebesar 99,86% dan forklift 3 sebesar 98,10%. Untuk kondisi usulan 1 utilitas forklift 1 sebesar 99,86%, forklift 2 sebesar 99,86% dan forklift 3 sebesar 98,58%. Sedangkan untuk kondisi usulan 2 utilitas forklift 1 sebesar 99,86%, forklift 2 sebesar 99,86% dan forklift 3 sebesar 98,66%. PT. XYZ has a new warehouse, warehouse 12. Warehouse 12 does not have any arrangements regarding the layout of raw materials. The raw materials referred to are plate, sheet, and coil raw materials, as well as material handling, i.e forklifts and trailer trucks. To avoid confusion when drafting and placing, a fixed placement is required. Therefore, the dedicated storage method is used in this study. From this layout, it is necessary to compare the existing conditions and 2 proposed alternatives to find out the best alternative to get the optimal layout, and also a simulation using ProModel is required for comparison related to its utility. Placement of plate, sheet, and coil raw materials in warehouse 12 based on dedicated storage policy, from the comparison between throughput and space requirements, results in the order from largest to smallest, i.e P2 - P4 - S4 - S3 - S2 - S5 - C4 - P1 - C1 - C5 - P5 - S1 - P3 - C2 - C3. The total material handling costs in warehouse 12 based on the dedicated storage policy with each existing condition, obtained a total material handling cost of Rp. 2,825,467,122.19 and for proposed condition 1, the total material handling cost is Rp. 2,310,973,601.76 and for the condition proposal, 2 obtained a total material handling cost of Rp. 142,795,485.50. 5. Percentage of utility for efficient use of material handling tools at warehouse 12, where for the existing conditions the utility for forklift 1 was 99.86%, forklift 2 was 99.86% and forklift 3 was 98.10%. For the proposed condition, forklift 1 utility is 99.86%, forklift 2 is 99.86% and forklift 3 is 98.58%. Meanwhile, for the condition of the proposed 2 utility forklift 1 was 99.86%, forklift 2 was 99.86% and forklift 3 was 98.66%.
Co-Authors Al-Atur Akbar Felayani Mochamad Rifky Mulyawan Muharni, Yusraini