Blade oscillations

Rigorous design reviews must include the often highly complex resonance behavior of impellers and blading to ensure vibration-free or vibration-tolerant design of these critical turboexpander components. In other words, the manufacturer must perform comprehensive theoretical and experimental studies of the blade oscillations in the rotating system. 

Blade advance should be slow and smooth, but blade oscillation should be as high as possible. Deleterious effects as a result of tissue compression can be minimized by cutting from the side of the tissue block closest to the location of the cells of interest. Slicing is best observed under a dissecting microscope. 

Oscillating kneader extruder, based on a single helical screw blade which in addition to its rotary... 

Although the motor power consumption is strongly correlated with the torque on the impeller,it is less sensitive to high frequency oscillations caused by direct impact of particles on the blades as evidenced by Fast Fourier Transform (FFT) technique. ... 

In more recent times, the procedure was mechanized and what had been done by hand is now accomplished by motorized rotating or oscillating extrusion blades (Fig. 

Low pressure EXTRUDER in which the DIE PLATE resembles a basket, using rotating or oscillating EXTRUSION BLADES. 

The flow in the final stages of large steam turbines is transonic with maximum Mach numbers of about 2 and shock waves are always present. The flow may not always be steady relative to the blades and periodically oscillating waves of the type observed in nozzles by Barschdorff [1] and Skillings [2] may be the norm rather than the exception. The three-dimensional geometry of turbine blading is complex and most attempts to calculate nucleating and wet steam flows have adopted numerical rather than analytical methods. Because of this. 

Oscillating or reciprocating paddle flocculators may be on shafts mounted vertically, which move vertically up and down in the direction of the shaft axis, or they may be on frames swinging to and fro in a pendulum-like motion. Both types impart a harmonic motion to the blades. 

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