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All Journal Jurnal Ilmiah Sport Coaching and Education Jurnal Teknologi dan Rekayasa Alat Berat (JTRAB)
Nugroho Santoso
Program Studi Diploma Teknik Mesin Sekolah Vokasi Universitas Gadjah Mada Yogyakarta
Automotive Engineering Control & Systems Engineering Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering Other

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PERBANDINGAN METODE LATIHAN PIRAMIDA DAN METODE LATIHAN MULTIPLE SET TERHADAP PENINGKATAN KEKUATAN OTOT TUNGKAI PADA TIM PUTERA HOKI UNIVERSITAS NEGERI JAKARTA Santoso, Nugroho; Matakupan, Octavianus; Marison, Roy Widyonarto
Jurnal Ilmiah Sport Coaching and Education Vol. 1 No. 2 (2017): Jurnal Ilmiah Sport Coaching and Education Vol 1 No 2 tahun 2017
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JSCE.01206

Abstract

ABSTRAK. Penelitian ini bertujuan untuk mengetahui beberapa hal yaitu 1) Metode latihan piramida meningkatkan kekuatan otot tungkai tim putera hoki Universitas Negeri Jakarta. 2) metode latihan multiple set meningkatkan kekuatan otot tungkai tim putera hoki Universitas Negeri Jakarta. 3) Efektivitas metode latihan piramida lebih efektif dibanding dengan metode latihan multiple set terhadap peningkatan kekuatan otot tungkai pada tim putera hoki Universitas Negeri Jakarta. Proses penelitian sampai tahap akhir yaitu pengolahan data, dilakukan mulai dari bulan Januari sampai bulan Juni 2016 di kampus b Universitas Negeri Jakarta. Menggunakan metode eksperimen, dengan jumlah pertemuan sebanyak 16 kali pertemuan. Populasi dan sampel yang diteliti ialah 30 orang atlet putera hoki Universitas Negeri Jakarta, penelitian ini menerapkan latihan single leg press menggunakan dua metode piramida dan metode multiple set. Berdasarkan hasil penelitian, 1) perbandingan data awal dan akhir pada metode latihan piramida, nilai standar deviasi dari difference 26,71, nilai standar error dari mean of difference 7,14, kemudian diperoleh nilai (thitung) 15,35 dan (t tabel) sebesar 2,14. Berarti terjadi peningkatan yang signifikan hasil metode piramida terhadap kekuatan otot tungkai tim putera hoki UNJ. 2) perbandingan data awal dan akhir pada metode latihan multiple set, nilai standar deviasi dari difference 17,76 , nilai standar error dari meanof difference 5,65, kemudian diperoleh nilai (t hitung) 15,84 dan (t tabel) sebesar 2,14. Berarti terjadi peningkatan yang signifikan hasil latihan single leg press menggunakan metode multiple set terhadap kekuatan otot tungkai tim putera hoki UNJ. 3) perbandingan data tes akhir antara metode metode piramida dan multiple set terhadap peningkatan kekuatan otot tungkai tim putera hoki UNJ, rata-rata variabel x (piramida) sebesar 506,73 standar deviasi 38,57 dan varian 1487,92. Rata-rata variabel y (multiple set) sebesar 481,46, standar deviasi 44,80 dan varian 2007,71. kemudian diperoleh nilai t-hitung 1,6. Sedangkan nilai t-tabel sebesar 2,05. Jadi t-hitung t-tabel. Sehingga dapat disimpulkan, metode piramida lebih efektif dibanding metode multiple set terhadap peningkatan kekuatan otot tungkai tim putera hoki Universitas Negeri Jakarta, hanya saja perbedaan hasil peningkatan kekuatan otot tungkai pada kedua metode tidak signifikan. Kata Kunci; Latihan Piramida, Latihan Multiple Set, Kekuatan Otot Tungkai, Hockey
Analisa Crack Coil Spring Track Adjuster pada Undercarriage Excavator CAT 320GC Aldi Lavandida Utama; Santoso, Nugroho; Setyana, Lilik Dwi; Hendaryanto, Ignatius Aris
Jurnal Teknologi dan Rekayasa Alat Berat Vol 2 No 1 (2025): JTRAB Volume 2, No 1, 2025
Publisher : Department of Mechanical Engineering, Vocational College, Gadjah Mada University.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtrab.v2i1.15209

Abstract

Heavy equipment, such as excavators, plays a crucial role in infrastructure and mining projects. The demanding worksite conditions and production targets require excavators to maintain high productivity, which can lead to material failures. A critical failure observed in the CAT 320GC excavator was the fracture of the coil spring in the undercarriage system. Several factors can contribute to coil spring failure, including worksite conditions, material defects, inadequate maintenance, and operational errors. This study aims to identify the root causes of coil spring fracture by analyzing its mechanical properties. The research methodology includes chemical composition analysis, visual and microstructural examination, hardness testing, and impact testing. The findings indicate that material failure was primarily caused by corrosion on the surface, which accelerated the fracture process. Additionally, repeated excessive loads from track shoe movements contributed to fatigue failure. The coil spring material was identified as high-carbon steel, closely resembling the 51xx (Chromium Steels) type. The fracture exhibited brittle characteristics with a granular or crystalline pattern, and the average impact energy was measured at 0.1541 J/mm². The coil spring material demonstrated an average hardness of 522.83 VHN, confirming its high hardness but brittle nature. The microstructural analysis revealed a predominance of fine lamellar pearlite in the dark regions of the fractured area.
Analisis Kegagalan Material Patahnya Coil Spring pada Track Adjuster Excavator PC 78 Leo Adi Saputra; Santoso, Nugroho; Setyana, Lilik Dwi; Basuki, Budi
Jurnal Teknologi dan Rekayasa Alat Berat Vol 2 No 1 (2025): JTRAB Volume 2, No 1, 2025
Publisher : Department of Mechanical Engineering, Vocational College, Gadjah Mada University.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtrab.v2i1.15707

Abstract

One of the critical components of an excavator's undercarriage is the coil spring, which frequently breaks due to extreme working conditions, lack of routine maintenance, and material defects. This coil spring failure often occurs in the PC 78 excavator unit. The resolution of this issue requires an undetermined period of time. This problem can lead to decreased and suboptimal excavator productivity. The objective of this study is to identify the causes of coil spring fractures, evaluate its mechanical strength, and determine the type of material used. The methods applied include chemical composition analysis, microstructure examination, hardness testing, and impact testing. Visual observations indicate that the coil spring failure is caused by material fatigue, crack initiation, propagation, and final fracture characterized by beach marks and striations. Chemical composition analysis reveals the dominance of iron (Fe), carbon (C), chromium (Cr), and manganese (Mn), classifying the material as AISI 51xx steel. Microstructural examination shows a dominance of bainite, which contributes to the material's hardness. Vickers hardness testing indicates high hardness values consistent with the observed microstructure. Impact testing results suggest that the fractured specimen exhibits ductile behavior.
Co-Authors Aji, Muhammad Sulistiyo Alamin, Rachmat Aldi Lavandida Utama Budi Basuki Ignatius Aris Hendaryanto Jibril Maulana Leo Adi Saputra Lilik Dwi Setyana Mandala, Wirawan Widya Marison, Roy Widyonarto Matakupan, Octavianus Radhian Krisnaputra Setiawan, Widia Setiawan, Widia Suharnadi, Bambang Surojo, Surojo Tarmudi, Achsan Winarto, Felixianus Eko Wismo Wiyadi Wiyadi