Test rigs are machines for testing the performance of manufactured machine components. The components can be tested under various loading, speed and ambient conditions. Accelerated tests can be done for millions of cycles of operations or till failure, as required.
To find a better method , for testing more than one components parallelly, with very less power, with a single loading / torqueing actuator.
One such component is the propeller shaft. Axles are also similar. These must be tested at speeds and loads compatible to actual and higher loads in case of accelerated tests. Generally, it involves running the machines consuming power and is undesirable.
Hence, an effort has been made to test 4 components-2 sets of 2 in series working against each other.
This essentially means that the first set delivers power to the second set and then it is fed back to the first set.
One such component is the propeller shaft. Axles are also similar. These must be tested at speeds and loads compatible to actual and higher loads in case of accelerated tests. Generally, it involves running the machines consuming power and is undesirable.
Hence, an effort has been made to test 4 components-2 sets of 2 in series working against each other.
This essentially means that the first set delivers power to the second set and then it is fed back to the first set.
As shown in the sketch, all the four shafts are connected. At the drive point, there is a mechanism with helical slot drive, which will induce torque in the whole system. The arrangement can vary the torque in the system while running. This is done using a servo motor - ball screw combination.
The main motor drives the whole system at the desired speed. Both the speed and torque are measured and can be plotted. Since the torque is produced by differential torsional feedback, there is no power required for achieving this. The power required for testing would only be frictional losses in the whole system.
Any rotating power transmission component can benefit from this test method.
The differential angular displacement in the system is achieved by a purely mechanical device.
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