The Characteristic of Variable Frequency Drive for Water Flow Control in the SFC Plant

One of several techniques to control fluid flow-rate through a pump is using variable frequency drive.  This paper presents how experiment be able to perceive the characteristic of variable frequency drive (VFD) to control water flow-rate in the Simulator Flow Control (SFC) plant. The SFC plant is developed for a fluid course learning simulator. The user would be able to set the desired value of frequency or flow-rate through a convenient interface. To provide it, the characteristic of VFD-frequency-to-flow-rate must be firstly observed, as reported in this paper. The fluid flow-rate control is designed without an electric valve, but using VFD to drive the 250 Watt water pump. In this first development, the SFC Plant successfully work with various water flow-rate from 2 Liter per minute until 20 Liter per minute by changing the frequency input of VFD. The water flow-rate was measured by manual rotameter, the flow sensor has not been applied yet in this first development. In this experiment, the VFD’s frequency was set from 10 Hz to 36 Hz with 2 Hz intervals. Result showed that VFD frequency is proportional to water flow-rate. The higher frequency given to VFD, the faster rotational motor of water pump generated and then given rise to water flow-rate. Using linear graphic approach, the characteristic is shown through the linearity coefficient of 0,68 and constant value of 3.43. This characteristic value would be useful for open-loop-control and user interface programming in next step of development

Design and Development of Fuzzy-PID Controller for Four-Wheeled Mobile Robotic Stability: A Case Study on the Uphill Road

Design intelligent control to maximize the performance of the Four-Wheeled Mobile Robot (FWMR) in case of uphill road problems. The variation of slope angle and load variation on the uphill road is applied to know the performance of the automatic control system on FWMR. The research is divided into three two covering, system identification, design system and simulation testing. The Rotary speed control system response with fuzzy-PID control method has a good performance by anticipating various tilt angle 5o. The system can through uphill with loads 11N with a steady time and fast travel time. The best travel time in the 5o tilt angle condition is 2 seconds with a 4m circuit length. This research concludes that fuzzy-PID control can be implemented and increase the dynamic response of the FWMR effectively on the uphill road problems

SISTEM PENCATATAN DAN PELAPORAN DOWNTIME PADA AREA KONVEYOR DENGAN KOMUNIKASI WIFI

Pencatatan downtime di beberapa industri menengah masih menggunakan sistem manual (misalnya pada PT. Jatim Autocomp), yaitu berdasarkan perhitungan lama waktu terjadinya downtime di area konveyor menggunakan stopwatch dan dicatat pada papan laporan setiap 2 jam sekali. Untuk itu dibuatlah sistem yang mempermudah pegawai pada proses pemantauan waktu downtime pada konveyor secara otomatis. Metode yang digunakan untuk mendapatkan waktu selama downtime yaitu dengan cara menghitung selisih antara waktu selesai downtime dikurangi dengan waktu pertama mengalami downtime. Data yang didapat akan dikelola oleh Arduino Mega yang dilengkapi dengan Ethernet Shield dan akan ditampilkan dalam database pada web menggunakan komunikasi Wifi. Sensor yang digunakan yaitu proximity induktif yang diletakkan pada konveyor. Setelah dilakukan pengujian, hasilnya menunjukan bahwa jarak maksimal erthenet shield tanpa penghalang 50 meter dan menggunakan penghalang 40 meter serta lama pencatatatan waktu downtime ± 5 detik dalam pengiriman data ke web

Fiber Optik Berstruktur Singlemode-Multimodesinglemode (Sms) U-Bent Sebagai Sensor Alkohol

Telah diusulkan rancang bangun sebuah sensor kadar alkohol berbasis fiber optik hetero-struktur. Struktur sensing-probe yang digunakan dalam penelitian ini adalah sambungan singlemode-multimode-singlemode (SMS) dan dibengkokkan menyerupai huruf U, yang selanjutnya disebut dengan u-bent. Struktur SMS dipilih untuk memperoleh sensitivitas yang tinggi. Penelitian ini memanfaatkan efek makrobending dan prinsip multimode interference dimana dilakukan rekayasa medium cladding dengan memvariasikan larutan alkohol dari 0% - 5%. Pengujian performansi sensor dilakukan dengan mengukur daya keluaran sensor akibat adanya pengaruh dari parameter panjang MMF-section, diameter lengkungan dan konsentrasi alkohol yang digunakan. Cahaya infrared (1310 nm) ditransmisikan melalui fiber optik SMS u-bent yang medium cladding-nya telah dimodifikasi oleh variasi kadar alkohol. Adanya variasi kadar alkohol menyebabkan karakteristik daya yang ditransmisikan berubah. Dari hasil pengujian sensor secara eksperimen, sensor fiber optik SMS u-bent dengan diameter lengkungan 50 mm dan variasi panjang MMF sebesar 63 mm memiliki kinerja yang terbaik ditinjau dari sensitivitas tertinggi yaitu 3.38 dB/% ============================================================================================== An alcohol sensor based on fiber optic hetero-structured has been proposed. The structure of sensing probe is Singlemode-Multimode-Singlemode (SMS) which has been bent into U shaped, and soon called as SMS u-bent. SMS structured is used to develop higher sensitivity of sensor. This research utilize the macrobending effect and multimode interference principle by varying alcohol concentration from 0% - 5% as the modified cladding. The performance test of the sensor has been done by measuring power output sensor. The value of power output sensor is affected by the lenght of MMF-section, bending diameter and alcohol concentration. An infrared (1310 nm) has been excited through fiber optic SMS ubent which has a modified cladding. The various alcohol concentrations cause the characteristic of transmited power changed. According to the result of sensor testing experiment, SMS u-bent sensor with 63 mm MMF lenght and 50 mm bending diameter has the highest sensitivity of 3.38 dB/