Seno Darmawan Panjaitan

Development of Automation System for Room Lighting Based on Fuzzy logic Controller

This paper describes the development of fuzzy logic controller for room lighting system using AT89S51 microcontroller. The fuzzy logic system has two membership functions for the light sources as inputs and one membership function for the output. The first light source is from the outside and the second light source is available in the room. The other input to the control system is from the occupation sensor. The output membership function of the control system is used to determine the number of compact fluorescent lamp (CFL) that must be turned on. The control system will switch the CFL on or off according to the condition of the illuminance in the room. The room illuminance is based on Indonesian National Standard which is about 250 Lux. In case the room is empty, the controller will turn all lamps off. The result of experiment showed 23.9 % in power saving and 4.1 % in difference of control system output to the reference.

Comparative study of electric generator drive engine performance by various types of fuel

This paper discusses the performance of gasoline generator set (genset) by using gasoline, LPG, and biogas as the fuel. Combustion engine of the gasoline genset was modified in order to be able to operate using LPG and biogas fuels. A 850 W, 220 V, 50 Hz, single phase generator drive engine has been used in the experiment using 100-W and 200-W bulbs as the electrical loads. Five variables were compared based on the types of fuel and variations of load: fuel consumption (FC), specific fuel consumption (SFC), input energy (thermal energy), output energy (electrical energy), and thermal efficiency. As the results, SFC of the biogas was lower than gasoline and LPG. For 100-W bulb as the load, SFC of the gasoline, LPG, and biogas were 4.5294 kg/kWh, 2 kg/kWh, and 0.68 kg/kWh respectively. While 200-W bulb, SFC of the gasoline, LPG, and biogas were 2.2883 kg/kWh, 1.0742 kg/kWh, and 0.6476 kg/kWh respectively. In addition, the thermal efficiency of biogas was higher than gasoline and LPG. For 100-W bulb as the load, thermal efficiency by using gasoline, LPG, and biogas were 1.6741 %, 3.5884 %, and 10.5710 % respectively. For 200-W bulb, the thermal efficiency by using gasoline, LPG, and biogas were 3.3137 %, 6.6811 %, and 11.0996 % respectively.

A Formal Design of Automation Systems Based on Operation Modes Using High-level Petri Net

Several Operation Modes (OMs) guidelines and the related design are currently proposed by academicians and related organizations in informal way. However, the informal design has no verification method to analyze the design. This paper proposes a formal OMs-based design for automation systems by providing the template design modeled by using Colored Petri Net. Several analysis properties are considered, i.e. model statistic, home marking, boundedness, and deadlock. The design also describes the execution behavior of the used mechatronic components.