Misalignment and

The surface noise is clearly visible, masking small flaw signal. This is the price paid by using a long excitation. This noise produces at the same time, an evolution of the thickness of the tube and of the lift-off, a misalignement and a miscentring of the... 

The disadvantages of this method ate the need for a torque meter, longer total length of the pumping unit, and greater susceptibiUty to misalignment and vibrations. This method is used only at a manufacturer s test faciUties or research laboratories. It is not used in the field. 

For creaking and harsh noises, check for misalignment and belt tension. 

Critical speeds correspond to the natural frequencies of the gears and the rotor bearings support system. A determination of the critical speed is made by knowing the natural frequency of the system and the forcing function. Typical forcing functions are caused by rotor unbalance, oil filters, misalignment, and a synchronous whirl. 

Forces applied to a rotor. Rotor-applied forces can be due to drive torques, couplings, gears, misalignment, and axial forces from piston and thrust unbalance. They can be destructive, and they often result in the total destruction of a machine. 

Use of heat emissions of machinery or plant equipment as a monitoring and diagnostic predictive maintenance tool. For example, temperature differences on a coupling indicate misalignment and/or uneven mechanical forces. 

There are four alignment conditions perfect alignment, offset or parallel misalignment, angular or face misalignment, and skewed or combination misalignment (i.e., both offset and angular). 

Both angular misalignment and offset can occur in the vertical plane. Vertical misalignment, which is corrected... 

Under operating conditions, perform thermographic scans for temperature differences on the coupling, which indicates misalignment and/or uneven mechanical forces. 

As noted before, short focal ratios imply severe difficulties in generating the aspherical departure from an ideal sphere. It is, however, directly related to the telescope length, hence to the structure and building sizes, which are major cost positions and performance issues in a telescope project -cost of large structures and buildings, improbable thermal equilibrium hence local turbulence, misalignments and flexures, etc. 

On occasion, pumps are not directly connected to either a motor or a turbine. There is an intervening gear, which can increase the pump s speed by multiplying the driver s speed. The gear is another source of possible misalignment and vibration. I have always considered such reduction or speed increaser gears to represent poor design practice, and an unnecessary complication as they often require their own lubrication system. 

---