Salsabila, Zinda (2026) Proses Simulasi Beban Untuk Pelurusan Ulang Silinder Rod Unit Bulldozer D85a-2 Komatsu Yang Mengalami Buckling (Studi Kasus Di Pt. United Tractors Pandu Engineering Plant Rbpm-Balikpapan). Other thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 2039221018-Undergraduete_Thesis.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
2039221018-Undergraduete_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (3MB) | Request a copy |
Abstract
Silinder hidrolik merupakan salah satu komponen utama pada sistem hidrolik alat berat yang berfungsi mengubah energi fluida menjadi gerak mekanis. Pada unit Bulldozer Komatsu D85A-21, rod silinder hidrolik blade lift berpotensi mengalami kerusakan berupa pembengkokan (buckling) akibat beban kerja yang tinggi dan penggunaan dalam jangka waktu lama. Kondisi tersebut dapat menurunkan kinerja sistem hidrolik, mengurangi efisiensi kerja alat, serta meningkatkan risiko kegagalan komponen. Oleh karena itu, diperlukan analisis terhadap kondisi rod silinder untuk mengetahui tingkat kerusakan, kemampuan menahan beban kerja, dan upaya peningkatan keandalan komponen melalui proses perbaikan dan optimasi material. Metode penelitian dilakukan melalui observasi lapangan, pengukuran kelurusan rod menggunakan metode Total Indicator Reading (TIR), perhitungan dimensi rod dan beban kritis buckling menggunakan metode Johnson, analisis efisiensi silinder hidrolik, serta simulasi pembebanan menggunakan perangkat lunak SolidWorks. Selain itu, dilakukan optimasi material dengan membandingkan material existing S45C dengan material alternatif SCM440 berdasarkan sifat mekanik dan kemampuan menahan beban kerja. Data yang diperoleh kemudian dianalisis untuk mengevaluasi kondisi aktual rod silinder serta pengaruh pembebanan terhadap perilaku struktur rod. Hasil penelitian menunjukkan bahwa proses straightening berhasil menurunkan nilai TIR menjadi 0,13 mm sehingga rod memenuhi batas toleransi dan layak digunakan kembali. Rod silinder memiliki diameter 65 mm dan panjang 1220 mm dengan gaya kritis Johnson sebesar 700342 N serta safety factor sebesar 3,82 yang menunjukkan bahwa rod masih aman terhadap risiko buckling pada kondisi kerja aktual. Nilai efisiensi silinder hidrolik sebesar 86% menunjukkan kinerja sistem masih berada dalam rentang normal. Hasil simulasi SolidWorks menunjukkan bahwa peningkatan pembebanan menyebabkan kenaikan tegangan dan deformasi pada rod silinder. Sementara itu, hasil optimasi material menunjukkan bahwa material SCM440 memiliki yield strength sebesar 800 N/mm² yang lebih tinggi dibandingkan material S45C sebesar 340 N/mm², sehingga direkomendasikan sebagai material pengganti untuk meningkatkan ketahanan dan keandalan rod silinder hidrolik terhadap beban kerja.
======================================================================================================================================
Hydraulic cylinders are a key component in heavy equipment hydraulic systems, converting fluid energy into mechanical motion. In the Komatsu D85A-2 bulldozer, the blade lift hydraulic cylinder rod is prone to buckling due to high workloads and prolonged use. This condition can degrade hydraulic system performance, reduce equipment efficiency, and increase the risk of component failure. Therefore, an analysis of the cylinder rod condition is necessary to determine the extent of damage, its load-bearing capacity, and efforts to improve component reliability through repair and material optimization. The research method used was field observation, rod straightness measurements using the Total Indicator Reading (TIR) method, rod dimension calculations and critical buckling loads using the Johnson method, hydraulic cylinder efficiency analysis, and loading simulations using SolidWorks software. Material optimization was also performed by comparing the existing S45C material with the alternative SCM440 material based on its mechanical properties and load-bearing capacity. The data obtained was then analyzed to evaluate the actual condition of the cylinder rod and the effect of loading on the rod's structural behavior. The results showed that the straightening process successfully reduced the TIR value to 0.13 mm, ensuring the rod met the tolerance limits and was suitable for reuse. The cylinder rod had a diameter of 65 mm and a length of 1220 mm, with a critical Johnson force of 700342 N and a safety factor of 3.82, indicating that the rod remained safe from buckling under actual operating conditions. The hydraulic cylinder efficiency value of 86% indicated that system performance remained within the normal range. SolidWorks simulation results indicated that increased loading caused increased stress and deformation in the cylinder rod. Meanwhile, material optimization results indicated that SCM440 material had a yield strength of 800 N/mm², which was higher than S45C material at 340 N/mm². Therefore, it is recommended as a replacement material to improve the durability and reliability of the hydraulic cylinder rod under working loads.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Silinder hidrolik, Rod silinder, Buckling, Straightening, Efisiensi hidrolik, SolidWorks, Hydraulic cylinder, Rod cylinder, Buckling, Straightening, Hydraulic efficiency, SolidWorks. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ174 Maintenance and repair of machinery T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design T Technology > TJ Mechanical engineering and machinery > TJ840.A2+ hydraulic machinery |
| Divisions: | Faculty of Vocational > Mechanical Industrial Engineering (D4) |
| Depositing User: | Zinda Salsabila |
| Date Deposited: | 03 Aug 2026 05:05 |
| Last Modified: | 03 Aug 2026 05:05 |
| URI: | http://repository.its.ac.id/id/eprint/142480 |
Actions (login required)
 |
View Item |