Metode Nyquist - Metode Nyquist 1 Tinjau sistem loop...

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Metode Nyquist : 1. Tinjau sistem loop tertutup dengan fungsi alih sebagai berikut G ( s ) H ( s )= K S ( T 1 s + 1 ) +( T 2 s + 1 ) Periksalah kestabilan dengan menggunakan kriteria kestabilan Nyquist. Jawaban : Diagram Nyquist fungsi alih loop terbuka dengan nilai K kecil dan nilai K besar diperlihatkan pada gambar dibawah. Jumlah kutub G(s)H(s) dalam setengah kanan bidang s adalah nol. Dengan demikian, agar sistem ini stabil diperlukan N=Z=0 atau tempat kedudukan G(s)H(s) tidak mengelilingi titik –1+j0. Untuk nilai K kecil, tidak ada yang mengelilingi titik –1+j0. maka sistem adalah stabil untuk nilai K kecil. Untuk nilai K besar, tempat kedudukan G(s)H(s) mengelilingi –1+j0 dua kali dalam arah jarum jam, menunjukan dua gaya kutub loop tertutup dalam setengah kanan bidang s dan sistem tidak stabil. Untuk ketelitian yang baik, K harus besar. Akan tetapi, dari pandangan kestabilan, nilai K besar menyebabkan kestabilan yang jelek atau bahkan tidak stabil.
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