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128 Mihăiță Horodincă 3. Some Experimental Research Results on Monitoring Let be first a simple experiment. The belt drive transmission BT1 is switched-off (the belt was removed), no loading on EDM’s rotor anymore. Fig. 3 – The AEP evolution during EDM starting procedure (no loading on the EDM’s rotor). The evolution of AEP during the EDM starting procedure (star-triangle Fig. 4 – Gearbox start-stop clutching dynamics (on Kd1 configuration) mirrored in AEP evolution. connection) is given in Fig. 3. A strong transitory regime (high power, short
Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 129 time, sees Bs area) is observed, because of the dynamics of accelerated rotor motion, it needs a big amount of AEP stored as kinetic energy. In D the star connection is changed automatically in triangle connection, also a transitory regime (marked as Bt) occurs. Fig. 5 – Numerical filtered (with p=10) evolutions for AEP (given in Fig. 4) and REP. There is an interesting behavior of the EDM mirrored in AEP evolution, see the regions I and II. There are two free responses on 5.2 and 10.8 Hz frequency, due to the elastic system associated to the rotor (mechanical inertia, magnetic field stiffness and air friction damping). A second experiment describes (Fig. 4) the mirroring of the clutching dynamics of the gearbox (on Kd1). In A the MC3 clutch is engaged, the gearbox start the motion and the AEP consumption increases during a transitory regime B (with a 4.16 W·h average electrical energy stored as kinetic energy). The peak B1 indicates that the BT1’s driving belt start the sliding (the dynamic torque is bigger than the friction torque between the belt and the pulleys). In B2 the sliding disappears and immediately after (in C) starts the steady-state regime on 1000 rpm. Here the absorbed AEP is used to cover the waste of mechanical energy (dry and viscous friction). The AEP evolution seems to be noisily, but it will be proved later (Fig.7) that it is very useful for gearbox diagnosis. In D the clutch is disengaged (by switching-off the electrical supply) so the AEP suddenly decreases. The level of power in E is for a short time lower than in A, the difference (183 W) describes the viscous friction in MC3 clutch.
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BULETINUL INSTITUTULUI POLITEHNIC D
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Papers presented at THE INTERNATION
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SILVIU BERBINSCHI, VIRGIL TEODOR, N
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CONSTANTIN CHIRIȚĂ, ADRIAN HANGAN
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Bul. Inst. Polit. Iaşi, t. LVI (LX
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(6) ⎧ ⎪ ⎨ ⎪ ⎩⎪ FR 1 FR
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