Aplikasi Metode Neuro-Fuzzy Pada Sistem Pengendalian Antisurge Kompresor

Operating condition that unstabil to compressor is called surge, which defined as self oscillations between pressure and flow, that can cause serious damage to compressor. Because of this problem, it is necessary to design of antisurge compressor control. Using conventional control like PI (Proportional and Integral) controller, effective only for certain condition but uneffective for condition with non linier systems. To handle this problems, it is proposed using Neuro-Fuzzy controller. Application of these system will improve performance indicator of PI controller applied in combination Neural Network and Fuzzy Logic Control to get robust performance system. For respon transient experiment, with differential pressure ( P) 37.91 kg/cm2, Neuro-Fuzzy controller result better performance corcerning to PI controller with settling time 7.3 seconds, maximum overshoot 11.6223 %, error percent 0.0563013 % and error steady state 0.0213438 kg/cm2. Whereas, PI controller result settling time 22.3 seconds, maximum overshoot 17.8996 %, error percent 0.185294 % and error steady state 0.0702449 kg/cm2. For respon transient system simulation with noise and respon transient simulation with noise and load, Neuro-Fuzzy controller also shows better performance with settling time, maximum overshoot and error steady state smaller than PI controller

Pengaruh Kondisi Cuaca Penerbangan Terhadap Beban Kerja Mental Pilot

In modes of transportation, air transportation is the mode that is very dependent on weather conditions, either the aircraft will take off and on the cruise, weather phenomena which are beyond the control of human existence are often inserted into the factors which may be the cause of a accident. This study was conducted to determine whether the differences as a pilot mental workload in the weather phenomenon condition that occurs when operating the aircraft in terms of differences pilot age. Mental workload measurements performed using the Subjective Workload Assessment Technique (SWAT) method, this method using combine of three dimensions with their levels. The dimensions are time load, mental effort load, and psychological stress load. The results of studies showed that for overall, the level of the highest relative importance is the dimension of time, then all subjects have an agreement and assume that the time load is the most important factor in determining the level of pilot mental workload on the face weather conditions were influential in the world of aviation, while for the most burdened condition or pilot mental workload in the highest level either for both group is when aircraft face of changing wind conditions

Pengkajian Tingkat Beban Kerja Mental Pilot Pesawat Terbang Dalam Melaksanakan Tahap Fase Terbang (Phase of Flight)

Peristiwa kecelakaan pesawat terbang dapat terjadi pada tahap pengoperasian pesawat terbang, diawali sejak taxi, tinggal landas (take off), menanjak (climb), penerbangan jelajah (cruise), dan tahap pendaratan yang dimulai dari descent, awal pendaratan (approach) kemudian menyentuh landasan (touch down) sampai pesawat terbang berhenti di apron Bandar udara tujuan pendaratan. Penelitian dilakukan untuk mengetahui seperti apakah perbedaan beban kerja mental seorang pilot pada saat melaksanakan tahapan fase terbang (phase of flights). Pengukuran beban kerja mental dilakukan menggunakan metode Subjective Workload Assessment Technique (SWAT), metode ini menggunakan tiga kombinasi dari tiga dimensi dengan tingkatannya. Dimensi tersebut adalah beban waktu (time), beban USAha mental (effort), dan beban tekanan psikologis (stress). Hasil penelitian menunjukkan secara keseluruhan, tingkatan kepentingan relatif yang paling tinggi adalah dimensi beban USAha waktu (time), maka semua subyek mempunyai kesepakatan dan menganggap bahwa faktor beban waktu (time) merupakan faktor yang paling penting dalam menentukan tingkatan beban kerja mental pilot, sedangkan untuk kondisi yang paling terbebani atau beban kerja mental pilot akan meningkat (level tertinggi) apabila pilot dihadapkan pada saat pesawat akan melakukan prosedur pendaratan (landing)