Induction motors have become a major part of the industry because of strong construction, cheap in purchasing and maintenance, high efficiency, and easy to operate. Preventive maintenance must always be carried out on all industrial equipment, including induction motors to last long and prevent further damage. Based on research in the industry, around 42%-50% or almost 50% is bearing damage. One reason is the occurrence of misalignment during the installation of the load on the induction motor. This study tries to identify the condition of the motor and classify the level of misalignment damage that occurs. In the process, the mother wavelet like as Daubechis, Symlet and Coiflet discrete wavelet transform (DWT) are selected as tools in processing motor vibration data. The level of DWT applied is 1st to 3rd level. Then, the three types of signal extraction, namely sum, range, and energy, which are obtained from a high-frequency signal of DWT, are used as input to Quadratic and Linear Discriminant Analysis. Then, discriminant analysis analyzes and classifies them into normal operation and two misalignments conditions. The simulation shows that 1st level of Daubechis DWT combined with quadratic discriminant analysis generates the best classification. It results 0% error of classification with Db3, Db4 and Db5, 4.17% error with Db1 and 8.33% error with Db2.
PT Hanampi Sejahtera Kahuripan perusahaan pembuat pupuk pelepasan terkendali terdapat beberapa tempat penyimpanan untuk menampung bahan baku produksi maupun hasil produksi dipantau dengan level transmitter. Kerusakan pada level transmitter buatan China yang terhubung dengan program DCS Advantrool menyebabkan terganggunya proses produksi menyebabkan kerugian. Untuk mengatasinya maka dibuat alat alternatif monitoring berbasis mikrokontroler ATMega 16 dengan menggunakan sensor ultrasonik. Untuk memantau level diunit-unit hopper.Dalam penelitian ini dibuat desain monitoring menggunakan komputer sebagai master yang berkomunikasi serial memakai RS 232 dengan mikrokontroller dan sensor ultrasonic sebagai komponen pengirim dan penerima gelombang suara..Metode pengujian alat ini memanfaatkan refleksi gelombang ultrasonik pada medium yang dilalui mulai dari kerapatan rendah pada zat cair hingga padat. Jika gelombang ultrasonik berjalan melalui sebuah medium, secara matematis besarnya jarak dapat dihitung.Dari hasil Penelitian ini desain pengendali secara terprogram dapat ditampilkan di komputer menggunakan program Borland Delphi sebagai pusat monitoring dan controlling terhadap dinamika proses berupa data level untuk mengetahui persentase volume material di dalam hopper, pengggunaan clok 16.0 MHz diperlukan untuk menstabilkan penerimaan dan pengiriman data.
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