A new concept for controlling rotational machinery using a bio-rhythm has been proposed and realized in driving an electric fan and a lathe. The heartbeat signal was detected and the R-R interval of the signal was measured. An analog voltage derived from this interval controls the electric power of the fan or the lathe. In Part I, the experimental results on driving an electric fan as a representative of the environmental instrument were described. The heartbeat interval, the produced control voltage, the revolution of the fan and the wind velocity from the fan were measured and their power spectrum densities were computed. The so-called 1/f fluctuation and the effect of respiration on the heartbeat were found in each spectrum. In Part II, the experimental results were shown on driving the lathe as a representative of machining equipment. Turning was performed under the control of revolution of the spindle or speed of the tool slide. The revolution of the motor for spindle or tool slide and the roughness of the work machined were measured. Their power spectrum densities were computed from measured wave-forms. Using the heartbeat rhythm, the chatter vibration could be suppressed and surface roughness was improved. In addition, the surface of the work-piece machined with a diamond bit was more metallically brilliant than that machined with the conventional high speed steel bit. Though the 1/f fluctuation was observed in the power spectrum of the control voltage and the wave shape of the surface roughness, the effect of respiration was not found in the latter spectrum.
|Number of pages||13|
|Journal||Kikai Gijutsu Kenkyusho Shoho/Journal of Mechanical Engineering Laboratory|
|Publication status||Published - 1995 Jan|
ASJC Scopus subject areas
- Mechanical Engineering