Satellite Attitude Determination and Control System (ADCS) uses an active actuator with a Reaction wheel. This study uses PID and genetic algorithms to control the Reaction wheel. The initial population was 200, and the crossover rate was 0.8, the mutation constant was 0.01 with a stop generation criteria of 50 generations. Reaction Wheel Control in a closed ring with optimized PID control The Genetic Algorithm has transient response characteristics that are 1 seconds rise time, 9 seconds set time, 33.2% overshoot with an ITAE performance index of 481,9479. Use the Matlab program to conduct a Smart Nanosatellite Attitude Propagator (SNAP) simulator to create a 3-axis reaction wheel model as its actuator. The satellite is the object of control, simulating the satellite conditions in a tumbling state having the initial angular velocity [0.5 0.5 0.5] ° / second then stumbling which makes the satellite angular velocity to [0 0 0] ° / second. Roll and yaw axes have a significant enough error that is1 rad / s and -1 rad / s while the pitch axis has a small error that is 1.5 10−3 / and −1.5 10−3 /s.
Seiring dengan pengembangan infrastuktur jalan tol, perlu kita antisipasi dan melakukan pemantauan efek yang ditimbulkannya, terutama bagi penduduk yang tinggal disekitar jalur tol. Efek getaran yang ditimbulkan oleh lalu lalang kendaraan dapat mengganggu kesehatan penduduk, jika melewati Batas Ambang Maksimal. Berdasarkan hal tersebut, dlama penelitian ini akan merancang alat ukur getaran yang dapat dipantau secara online getaran (percepatan) tersebut. Alat ukur getaran telah dirancang dengan menggunakan sensor accelerometer MMA7361, Pengiriman data dilakukan secara online menggunakan modul WiFi ESP8266 dan menggunakan sumber WiFi hotspot portable dari telepon selular. Pengukuran dilakukan selama sekitar 30 menit di tepi ruas jalan tol Jakarta-Serpong tepatnya di Km-11. Dengan menggunakan 4 buah sensor pengukuran getaran maka dilakukan variasi jarak sensor terhadap ruas jalan tol, jarak masing-masing antar sensor adalah sejauh 3 meter. Hasil pengukuran dan pengujian terhadap getaran kendaraan yang melintas di jalan tol sepong-Jakarta pada keempat sensor menunjukkan nilai percepatan <0,45m/s². Hasil pengukuran terhadap getaran kendaraan yang melintas di jalan tol Jakarta-Serpong Km 11 menunjukkan nilai percepatan yang dihasilkan adalah <0,45m/s². berdasarkan tingkat resiko terhadap paparan getaran bagi kesehatan nilai percepatan tersebut berada dalam kategori rendah sehingga jarak jalur tol berada pada zona aman bagi kesehatan penduduk disekitar Kata Kunci : soft track, accelerometer, MMA 7361, paparan getaran
<p><em>Measurement of Peak Particle Velocity (PPV) mm / sec in the Sabo dam construction project was carried out using seismic accelerometers. This study is to determine the value of PPV produced by construction equipment and then compared with the BS 6472-2: 2008 standard. The measurement method is carried out based on the applicable rules. PPV measurement results produced by each machine are different. In heavy equipment dump trucks, excavators, and front end loaders show PPV values at distances of 50 m, 100 m, 150 m and 200 m under safe conditions referring to the standard which is still in the range of 0.2 - 0.4 mm / sec. while for the pile driving device, demolition, vibrator pile driver at a distance of 50 meters are in unsafe conditions, because more than the range of 0.2 - 0.4 mm / sec, but at a distance of 100, 150, and 200 m PPV values are at safe condition</em></p><p><em><br /></em></p><p>Key words<strong>: </strong><em>PPV, Ground Vibration, Dam sabo</em></p><p><strong> </strong></p><p><em><br /></em></p>
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