Conformance testing of a rebuilt motor includes disposing a motor under test in a motor test stand, coupling a plurality of sensors to the motor under test including a first vibrational sensor to the motor under test; a first temperature sensor to the motor under test; a first rotational speed sensor to the motor under test. A set of test parameters are received comprising parameters for a conformance test, the test parameters including a vibrational sensor parameter, a temperature sensor parameter, and a rotational speed parameter. A motor under test is placed in an on-state and a processing device receives sensor data simultaneously from the sensors, determines that the rotational speed satisfies the rotational speed parameter, and stores time sampled sensor data received from the plurality of sensors relative to a time zero corresponding to a time when the rotational speed satisfies the rotational speed.

Conformance testing of a rebuilt motor includes disposing a motor under test in a motor test stand, coupling a plurality of sensors to the motor under test including a first vibrational sensor to the motor under test; a first temperature sensor to the motor under test; a first rotational speed sensor to the motor under test. A set of test parameters are received comprising parameters for a conformance test, the test parameters including a vibrational sensor parameter, a temperature sensor parameter, and a rotational speed parameter. A motor under test is placed in an on-state and a processing device receives sensor data simultaneously from the sensors, determines that the rotational speed satisfies the rotational speed parameter, and stores time sampled sensor data received from the plurality of sensors relative to a time zero corresponding to a time when the rotational speed satisfies the rotational speed.

The invention relates to a method for controlling, more particularly in a closed-loop manner, a test bench for a powertrain with a real transmission, the method including calculating a desired value of a control parameter, more particularly a desired rotational speed, at the transmission output of the real transmission by means of a model that represents the transmission and at least one further component, more particularly a shaft, of the output side of the powertrain as virtual components, on the basis of at least one measurement parameter, more particularly a rotational speed and/or a torque, measured on the powertrain; and controlling the test bench, more particularly a load machine, on the basis of the desired value.

The invention relates to a method for controlling, more particularly in a closed-loop manner, a test bench for a powertrain with a real transmission, the method including calculating a desired value of a control parameter, more particularly a desired rotational speed, at the transmission output of the real transmission by means of a model that represents the transmission and at least one further component, more particularly a shaft, of the output side of the powertrain as virtual components, on the basis of at least one measurement parameter, more particularly a rotational speed and/or a torque, measured on the powertrain; and controlling the test bench, more particularly a load machine, on the basis of the desired value.

The invention relates to a device and to a method for controlling a test stand arrangement having a specimen and having a loading machine, which is connected to the specimen by a connecting shaft. An estimated value (T.sub.E,est) for for the internal torque (T.sub.E) of the specimen is determined and, from the estimated value (T.sub.E,est), while taking into account a natural frequency (f.sub.0) and a delay, a damping signal (T.sub.Damp) is determined and fed back into the control loop.

The invention relates to a device and to a method for controlling a test stand arrangement having a specimen and having a loading machine, which is connected to the specimen by a connecting shaft. An estimated value (T.sub.E,est) for for the internal torque (T.sub.E) of the specimen is determined and, from the estimated value (T.sub.E,est), while taking into account a natural frequency (f.sub.0) and a delay, a damping signal (T.sub.Damp) is determined and fed back into the control loop.

A test rig of the closed loop type for testing power transmission units of any geometry, in particular helicopter transmissions, comprising drives with friction belts, flat belts in particular. The belt drives have pulleys with diameters that compensate for the creep in the belts. In some embodiments, the test rig comprises ‘slave’ transmissions. In some embodiments the slave transmission is positioned and oriented in such a manner that all its input and output shafts, regardless their different space angles, become parallel and rotating in the same direction as their corresponding shafts on the tested transmission. The shafts can thus be connected by the flat belt drives to close the loops. In other embodiments, sets of gearboxes are run with their slave units; their orientation is also set so as to enable the parallelism and identity of the rotational direction of the shafts the belt drives are connected to. Still, in other embodiments, the close loops are implemented by belt drives only, including belt drives with twisted belts. Torquing the loops is accomplished either by tensioning the belts during operation or by a torque generator device.

Various aspects of the present disclosure are directed to a test bench and methods for carrying out a test run on a test bench. In one example embodiment, a test run method includes: connecting a test object to a load machine, specifying a target torque for a torque controller by a test bench automation unit according to the test run, adjusting an actual torque of the load machine by the torque controller, specifying a test object control variable for the test object by a test object controller, determining an actual rotational speed of the load machine, determining at least one deviation of at least one attribute of the actual rotational speed from at least one threshold value, and based on the at least one deviation, and determining at least one additive torque correction value and superimposing the at least one additive torque correction value on the target torque.

Various aspects of the present disclosure are directed to a test bench and methods for carrying out a test run on a test bench. In one example embodiment, a test run method includes: connecting a test object to a load machine, specifying a target torque for a torque controller by a test bench automation unit according to the test run, adjusting an actual torque of the load machine by the torque controller, specifying a test object control variable for the test object by a test object controller, determining an actual rotational speed of the load machine, determining at least one deviation of at least one attribute of the actual rotational speed from at least one threshold value, and based on the at least one deviation, and determining at least one additive torque correction value and superimposing the at least one additive torque correction value on the target torque.

Conformance testing of a rebuilt motor includes disposing a motor under test in a motor test stand, coupling a plurality of sensors to the motor under test including a first vibrational sensor to the motor under test; a first temperature sensor to the motor under test; a first rotational speed sensor to the motor under test. A set of test parameters are received comprising parameters for a conformance test, the test parameters including a vibrational sensor parameter, a temperature sensor parameter, and a rotational speed parameter. A motor under test is placed in an on-state and a processing device receives sensor data simultaneously from the sensors, determines that the rotational speed satisfies the rotational speed parameter, and stores time sampled sensor data received from the plurality of sensors relative to a time zero corresponding to a time when the rotational speed satisfies the rotational speed.