Consider the following problem of a temperature control system. Pertimbangkan masalah bagi sistem kawalan suhu berikut. [a] The process reaction curve of the process gave the values Lengkungan tindak balas proses bagi proses tersebut adalah K=10=2mintd=0.1min Compute the settings of a PID controller using the Cohen-Coon tuning methodology. Kirakan set-set kawalan PID menggunakan kaedah penalaan Cohen-Coon. [8 marks/markah] [b] If the process is treated as a first order system, determine the amplitude ratio when it happens at corner frequency. Sketch the Bode diagram and indicate on the diagram the important parameters. Jika proses ini dianggapkan sebagai sistem tertib pertama, tentukan nisbah amplitud apabila ia berlaku pada frekuensi sudut. Lakarkan gambarajah Bode dan tunjukkan parameter-parameter penting pada gambarajah tersebut. [8 marks/markah] [c] For only the proportional control, determine the setting using Ziegler-Nichols method. Compare to the value obtained if Cohen-Coon tuning method is used. State your observation. Bagi kawalan berkadar sahaja, tentukan setnya menggunakan kaedah ZieglerNichols. Bandingkan nilai yang diperolehi jika kaedah penalaan Cohen-Coon digunakan. Nyatakan pemerhatian anda. [9 marks/markah]