Vol. 13 No. 3 (1998)

In obtaining the dynamic response of a dynamic system, its uncouple modal equation of movement simplifies the usage of superposition modal method. This paper proposes a strategy to obtain the uncouple modal equation based an hypotheses of Basile: "Although the presence of modal-damping-couple, the modal equations of movement are dynamically uncoupled for a structure having small damping coefficient if its natural frequencies are well-separated"(1). This hypotheses is justified by several authors, i. e. by Hasselman(1). Thus, by separating the natural frequencyof a dynamic system using…

In general, the gas exits from gas turbine still has a high temperature. To recover its energy, a Rankine cycle is installed to receive thermal input energy from the gas. For each value of pressure ratio of the Brayton cycle, the optimum total efficiency is largely controlled by the pressure and temperature of steam entering turbine and the steam"”air mass flow rate ratio of the system. With the environment, the fluid entering temperature to the turbines, the minimum fluids temperatures difference in heat exchangers, and the quality of steam at the exit of steam turbine as constraints,…

Turbo Mixer with 350 kg capacity is designed to mix greensand by mixing it using turbo blade rotation so it creates a mix using scatter method. Using this method, the greensand will not be damaged during the process. The turbo blade rotation with lateral mixing arm was set in a way that the mixer could work efficiently. The construction of this turbo mixer is rigid but simple to ensure the easiness of operating, maintenance and manufacturing. In other application, Turbo Mixer could be developed for mixing of fertilizers, drugs etc. Several design practice figures for 350 kg turbo mixer, are…

This paper discusses the implementation of a fuzzy logic controller on a precision straight-line motion mechanism. The precision straight-line motion mechanism, which is studied in this research, is a mechanism that was built to study methods of precision positioning. For this mechanism, a conventional PID (Proportional, Integral, and Derivative) controller will not beable to produce good performances because of non-linearity behavior of this mechanism. This paper shows that a fuzzy logic controller based on knowledge of a human (an operator) can solve this nonlinearity problem.

In this experiment, the study focusses on reactor core thermohydraulic aspects especially the distributions of fuel surface temperature, fluid temperature and fluid axial velocity. Simulation data were obtained in the middle, at the edge and at the comer sub-channels. In this experiment, modeling of hexagonal configuration of reactor core and reflector was carried out. The power generations were assumed constant at 250 kwatt, 375 kwatt and 5 00