Couple/Torque

Descriptive Statistics (e.g., mean, median, variance, standard deviation) Hypothesis Testing (e.g., paired and un-paired t-tests chi-squared test) Principles of Statics (e.g., forces moments couples torques free-body diagrams)... 

Various coupling designs are available to transmit torque from the driver, eg, electric motor, to a pump. In order to contain the pumped fluid inside the pump and prevent the pumpage from leaking, several types of sealing methods are used. A few options are described herein. 

Disk Coupling. Diaphragms are used to transmit torque between the iaside and outside diameters of the flexible element ia disk coupling (Fig. 14b). Up to 0.1-mm (0.004-ia.) parallel misalignment can usually be tolerated. Whereas no oil lubrication is required as compared to gear couplings, disks ate limited to moderate torques. 

Special Types. Many other coupling types are available. These vary ia degree of complexity, maintenance time, torque capabiUties, and price. A good comparison study on coupling is available (36). An elastomer-type coupling is one of the most popular types used, particularly ia the chemical iadustry. 

Power for each Hquid and the soHd phase must be added to get Pp. P, the soHds process power, = T -AN for scroU decanters, where = conveyor torque and AN = differential speed between bowl and conveyor. Pp is the friction power, ie, loss in bearings, seals, gears, belts, and fluid couplings. P, the windage power, = K and fi = viscosity of surrounding gas p = density of gas D = rotor outside diameter N = rpm and K = shape... 

For instance, power can be transmitted from one machine to the other through shafts, flexible couplings, and gear reducers (mechanical equipment). Power can be transmitted through a torque converter (hydraulic equipment) or by a combination of mechanical and hydraulic equipment. 

Let us use a fluid coupling and start the motor lightly, similar to Figure 8.3. The revised accelerating torque and approximate clutching sequence of the coupling is illustrated in Figure 7.22. 

In the above two types of couplings the transmission of torque is linear, but now the driving torque rises as the square of the input speed (7 N"). These couplings... 

Adequate sizing of shafts, couplings, and bearings for maximum torque conditions... 

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. 

Impact torque. A function of system looseness or backlash. Generally, mechanical-joint flexible couplings have inherent backlash. 

The gas turbine is a high-speed, high-torque drive and requires that its coupling have the following characteristics ... 

There are three relevant bending moments caused by a gear coupling when transmitting torque with angular or parallel misalignment ... 

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