TABLE OF CONTENTS Accelerated dynamometer testing is one of the components of accelerated reliability testing (ART). It's also often used as a separate braking testing systems for engines, electromotors, transmissions, etc.
The hydraulic dynamometer was invented over 120 years ago and has been continually developed to meet the ever changing needs of customers. This type of testing is seldom used for ART, because, as was mentioned earlier, ART is in development. As a second goal, separate dynamometer testing (or in combination with one or two other types of testing) is a traditional type and its development is geared to improving design and the system of control.
Most of these types of testing equipment (Magtrol, Inc [1], Froude Hoffman Gmbh [2], Burke Porter Co. [3], Kistler Instruments [4] , [5], MTS [6], and others) absorb power with a braking system which provides frictionless torque loading independent of shaft speed. For example, the Hysteresis Brake Magtrol, Inc. [1]) provides torque by the use of two basic components a reticulated pole structure and a special steel rotor/shaft assembly fitted together, but not in physical contact.
The role structure of the unit is energized, and the drag cup can spin freely on its shaft bearings. When a magnetizing force from the field coil is applied to the pole structure, the air gap becomes a flux field and the rotor is magnetically restrained, providing a braking action between the pole structure and the rotor.
