IDENTIFIKASI KERUSAKKAN MESIN BERDASARKAN SINYAL GETARAN DALAM DOMAIN FREKWENSI, STUDI KASUS DI PT.FREEPORT INDONESIA
Abstract
Strategi pemeliharaan mesin sangat penting dalam industri pertambangan, industri produksi semen atau industri lain sehingga diperlukan strategi perawatan yang sesuai berdasarkan kondisi operasi industri. Strategi pemeliharaan untuk untuk produksi 24 jam tentu saja tidak sama dengan strategi pemeliharaan dalam kondisi kerja normal. Pada makalah ini disajikan strategi pemeliharaan pro aktif, dimana pada strategi pemeliharaan pro aktif mensyaratkan berbagai investigasi kerusakkan mesin, investigasi kerusakkan mesin pada makalah ini menggunakan analisa sinyal getaran, dimana sinyal getaran tersebut dapat memberikan informasi kondisi kesehatan mesin sebelum mengalami kegagalan. Analisa sinyal getaran dapat dilakukan dengan menggunakan analisa getaran dalam domain frekwensi atau analisa getaran dalam domain waktu. Analisa getaran dalam domain frekwensi umumnya dilakukan untuk melakukan analisa getaran dalam kasus ketidakseimbangan, misalignment, cacat bantalan, kavitasi, kerusakan motor listrik. Sedangkan analisa getaran dalam domain waktu digunakan anlisa cacat roda gigi dengan putaran dibawah 600 rpm. Pada makalah ini ditemukan kasus baru pada bantalan yaitu kondisi terjadinya gesekan antara inner race dengan poros puli yang menyebabkan getaran tersebut teredam dan tidak memberikan informasi yang tepat, hal tersebut diketahui setelah memeriksa turunnya amplitudo getaran setelah pemeriksaan satu bulan sebelumnya, kemudian amplitudo getaran tiba tiba menurun, dan terjadi kerusakkan secara tiba tiba tanpa dapat diprediksikan.
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