| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1999: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1998: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1997: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Research Abstract |
This research deals with decentralized transportation system which consists of a large work and some small vibratory machine instead of a large vibratory machine. The merits of this decentralized transportation system are compact in machine size, saving energy in machine operation and layout free in plant design. Vibration of the vibratory machine and movement of the large work are coupled through normal force and friction force. The coupled vibration is nonlinear, and a resonance curve in small excited voltage has a peak in low frequency region and a resonance curve in large excited voltage has a peak in high frequency region. Transportation velocity property shows the same tendency. Driving system of the vibratory machine using self-excited vibration, which is derived from displacement feedback control, follows the resonance frequency change automatically, and the driving system improves vibratory machine eciency and vibration transportation eciency. Velocity feedback control products self-excited vibration in lower frequency region, and realizes vibration transportation of larger work mass. Amplitude constant control of self-excited vibration pulls up the upper limits of vibration amplitude and transportantion velocity. Amplitude control using variable velocity feedback gain starts up self-excited vibration quickly and also suppresses vibration quickly. The vibration which is controlled by variable feedback gain is in a critical limit and therefore, it will not contain any higher-harmonic components, which make some noise. The detail mathematical model consists of equations of motion for the work and the vibratory machine, frictional property between the two bodies, electric dynamics of an electromagnet, power amplier property, velocity feedback controller property and amplitude constant controller property. The simulation using the detail mathematical model predicts actual machine behavior precisely.
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