Pada dasarnya, khususnya di Indonesia rata-rata perkebunan hidroponik itu masih menggunakan sistem manual, termasuk dalam pengaturan nutrisi petani masih menggunakan sistem manual dalam pengaturannya. Hal tersebut memakan banyak waktu dalam melakukan pemberian nutrisi secara manual tersebut, petani harus telebih dahulu memberi air untuk setiap tandon nutrisi, lalu setelahnya petani harus memberi pupuk atau nutrisi A dan B untuk dicampur dengan air lalu diaduk. Tujuan dari penelitian ini adalah merancang dan mengimplementasikan sistem pengecekan dan pengaturan komposisi nutrisi dengan metoda logika fuzzy untuk mendapatkan dan menjaga kondisi ideal nutrisi untuk tanaman hidroponik jenis pakcoy. Dengan menggunakan metode fuzzy, sifat ketidakpastian yang sering muncul akan teratasi. Dengan membuat 19 himpunan keanggotaan input dan juga 19 himpunan keanggotaan output yang sudah dibuat dengan cara mengambil data untuk nilai konsentrasi nutrisi mencapai set point yaitu 1050-1400 ppm, sistem akan mampu membuat dan juga mempertahankan nilai konsentrasi nutrisi pada range ideal. Dari pengujian sistem yang dilakukan didapatkan kesimpulan berupa, penambahan nutrisi A dan B terbanyak yaitu 5100 mL dengan waktu 17 menit dalam keadaan wadah nutrisi maksimal, dan penambahan nutrisi A dan B paling sedikit adalah 300 mL dengan waktu 1 menit dalam keadaan wadah nutrisi maksimal. Kata kunci : fuzzy, nilai konsentrasi, nutrisi, pakcoy, PPM
Magnetic suspension in high-speed ground transport systems is an alternative to the rail wheel. The successful solution to the development of high-speed ground transport is largely determined by the creation of operationally efficient linear motors, the main task of which is to convert electrical energy into mechanical energy and create tractive force to ensure the movement of the crew according to a given program in the range of operating speeds. The article investigates linear asynchronous motors with longitudinal closure of magnetic flux of single-ended design. As a result of investigation of physical processes in linear motors caused by edge problems it was found that the cause of the transverse edge effect is the finite width dimensions of the reactive bus, the change of which causes closure of eddy currents within the active area of inductor, leads to weakening of magnetic field in the central zone and to reduction of tractive force. The discrepancy between the calculated and experimental indicators of physical processes in linear asynchro- nous motors due to significant idealization of mathematical models led to the development of a three-dimensional theory, brought to the calculation programs. The developed calculation program of electromechanical characteristics of linear induction motors with inductor and reactive bus layout, as well as their geometrical and physical parameters allows to determine the necessary integral motor characteristics in the form of a levitation function.
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