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All Journal VANOS Journal of Mechanical Engineering Education Journal of Educational Review and Research
Aditya Maulana
Universitas Negeri Semarang
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Energy Consumption Analysis on Ginger Extract Powder Mixer Machine Sarwi Asri; Prima Astuti Handayani; Djuniadi Djuniadi; Hanif Hidayat; Aditya Maulana; Muhammad Zhafran Dewantara; Siti Thoifatun Najiah
VANOS Journal of Mechanical Engineering Education Vol 9, No 2 (2024)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/vanos.v9i2.28785

Abstract

Ginger extract powder is a popular product in the beverage and health industry, requiring careful processing to produce high-quality results. This study aims to determine the efficiency of the stirring blade design on the ginger extract powder stirring machine. The intensive stirring process can lead to faster wear of the blades, making the selection of suitable materials crucial. The research was conducted through direct observation at UKM Bekti Pertiwi. The data collection process was structured to capture both quantitative data: 1) Energy consumption: energy used by the machine was measured in kilowatt-hours (kWh) using a standardized electricity meter, and 2) Cycle time: the time for a full cycle was recorded, from material input to the completion of the stirring process. A controlled sample of 2 kg of ginger essence was used in each test to standardize conditions and ensure consistent results. The sample size was chosen based on typical batch sizes processed by SMEs, aiming to represent common production volumes. The ginger essence sample was prepared with a standardized consistency and viscosity to reduce variability and ensure repeatability across tests. The stirring blade samples were manufactured from stainless steel with a Teflon coating, selected due to its corrosion resistance and durability in acidic environments. Blade dimensions were set to 504 mm in diameter and 3 mm in thickness, based on initial design research suggesting these dimensions as optimal for the desired mixing efficiency and wear resistance. Each test was conducted under the same operational settings, including motor speed and cycle duration, to maintain uniformity in testing conditions. Results indicate that a combination of stainless steel and Teflon in the stirring blades provides optimal performance, with energy consumption reaching 0.1072 kWh for 2 kg of ginger extract. The electricity cost for one production cycle is IDR 144.93. These findings can be used for future production planning, as well as to improve operational efficiency and the quality of ginger extract products.
KEEFEKTIFAN PROJECT BASED LEARNING UNTUK MENINGKATKAN KOMPETENSI TEKNIK PEMESINAN BUBUT DI SMK NEGERI 5 SEMARANG Aditya Maulana; Shohihatur Rohman; Kriswanto Kriswanto
Journal of Educational Review and Research Vol 9, No 1 (2026): VOLUME 9 NUMBER 1 JULY 2026
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/jerr.v9i1.8830

Abstract

Penelitian ini bertujuan untuk mengetahui keefektifan penerapan model pembelajaran Project Based Learning (PjBL) dalam meningkatkan kompetensi teknik pemesinan bubut siswa kelas XI Teknik Pemesinan di SMK Negeri 5 Semarang. Penelitian menggunakan pendekatan deskriptif kuantitatif dengan desain pre-eksperimen tipe one-group pretest–posttest. Sampel penelitian berjumlah 36 siswa yang dipilih menggunakan teknik purposive sampling. Instrumen penelitian berupa penugasan penyusunan jobsheet perencanaan pengerjaan bubut yang digunakan sebagai pretest dan posttest. Analisis data dilakukan secara deskriptif serta inferensial menggunakan uji normalitas Shapiro–Wilk, uji t berpasangan (paired sample t-test), dan uji N-Gain untuk mengukur tingkat efektivitas pembelajaran. Hasil penelitian menunjukkan bahwa nilai rata-rata siswa meningkat dari 54,36 pada pretest menjadi 82,14 pada posttest. Hasil uji hipotesis menunjukkan nilai t hitung sebesar 23,023 lebih besar dari t tabel 2,03 pada taraf signifikansi 0,05, sehingga terdapat perbedaan yang signifikan antara hasil belajar sebelum dan sesudah penerapan PjBL. Selain itu, nilai N-Gain sebesar 60,65% menunjukkan bahwa penerapan PjBL berada pada kategori cukup efektif dalam meningkatkan kompetensi pemesinan bubut siswa. Dengan demikian, model pembelajaran Project Based Learning dapat menjadi alternatif strategi pembelajaran yang efektif dalam meningkatkan kompetensi siswa pada pembelajaran teknik pemesinan bubut di SMK.
Co-Authors Djuniadi Djuniadi Hanif Hidayat Kriswanto Kriswanto Muhammad Zhafran Dewantara Prima Astuti Handayani Sarwi Asri Shohihatur Rohman Siti Thoifatun Najiah