Abstract: Various embodiments of the present disclosure are directed to methods for operating a test bench with a test object having at least two rotating masses connected by means of a loading shaft to a loading maching for driving or loading the test object. The loading maching controlled by a loading machine control unit. In one embodiment, the method includes: applying loads to the test object on the test bench, estimating an internal test object torque, determining a target loading machine speed, determining a shaft torque acting on the loading shaft, determining acceleration torques for accelerating the at least two rotating masses, addind the shaft torque with the correct sign with the correct sign to the acceleration torques, to form a corrected internal effective test object torque, and determining the target loading machine speed from the corrected internal effective test object torque or a torque derived therefrom.

Abstract: 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.

Abstract: To improve the identification of system parameters of a test setup of a test bench there is provision for the test setup to be dynamically excited on the test bench by virtue of a dynamic input signal being applied to the test setup. Measured values of the input signal of the test setup and of a resultant output signal of the test setup are recorded. A frequency response of the dynamic response of the test setup between the output signal and the input signal is determined using a nonparametric identification method. A model structure of a parametric model that maps the input signal onto the output signal is derived from the frequency response. The model structure and a parametric identification method are used to determine at least one system parameter of the test setup, and the at least one identified system parameter is used to perform the test run.

Abstract: Various embodiments of the present disclosure are directed to methods for operating a test bench with a test object having at least two rotating masses connected by means of a loading shaft to a loading maching for driving or loading the test object. The loading maching controlled by a loading machine control unit. In one embodiment, the method includes: applying loads to the test object on the test bench, estimating an internal test object torque, determining a target loading machine speed, determining a shaft torque acting on the loading shaft, determining acceleration torques for accelerating the at least two rotating masses, addind the shaft torque with the correct sign with the correct sign to the acceleration torques, to form a corrected internal effective test object torque, and determining the target loading machine speed from the corrected internal effective test object torque or a torque derived therefrom.

Abstract: 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.

Abstract: Aspects of the present disclosure are directed to a method for controlling the torque of a drive unit on a test stand. Accordingly, one embodiment of the present disclosure is a method for controlling an inner effective torque of the drive unit via a unit controlling unit, wherein an inner effective desired torque is determined from the given courses of the rotational speed and the torque of the drive unit and a known mass inertia of the drive unit, and an inner effective actual torque is determined during the operation of the drive unit on the test stand from measured values of the load machine and/or of the drive unit and/or of the connecting shaft and/or of a known mass inertia of the drive unit.

Abstract: Various aspects of the present disclosure are directed to, for example, methods of controlling a rotational speed of a maching. in one example embodiment, the method includes the steps of: generating a rotational speed reference variable for a controller from a rotational speed setpoint value; determining an adapted rotational speed setpoint value which considers a rotation angle actual value and a rotation angle setpoint value determined on the basis of the rotational speed setpoint value; and switching the rotational speed reference variable between the rotational speed setpoint value and the adapted rotational speed setpoint value as a function of the rotational speed.

Abstract: Aspects of the present disclosure are directed to controlling an inner effective torque or an effective torque of a drive unit via a unit controlling unit. In some embodiments, the control method may include providing desired values for the inner effective torque or the effective torque and determining actual values for the inner effective torque or the effective torque during operation of the drive unit on a test stand, and in that actuating dynamics of the drive unit are taken into account in the control by means of a transfer function by correcting the desired values of the control with the transfer function or in that for controlling the inner effective torque or the effective torque of the drive unit, a feed forward control of a manipulated variable of the drive unit is used.

Abstract: Aspects of the present disclosure are directed to a method for controlling the torque of a drive unit on a test stand. Accordingly, one embodiment of the present disclosure is a method for controlling an inner effective torque of the drive unit via a unit controlling unit, wherein an inner effective desired torque is determined from the given courses of the rotational speed and the torque of the drive unit and a known mass inertia of the drive unit, and an inner effective actual torque is determined during the operation of the drive unit on the test stand from measured values of the load machine and/or of the drive unit and/or of the connecting shaft and/or of a known mass inertia of the drive unit.

Abstract: Aspects of the present disclosure are directed to controlling an inner effective torque or an effective torque of a drive unit via a unit controlling unit. In some embodiments, the control method may include providing desired values for the inner effective torque or the effective torque and determining actual values for the inner effective torque or the effective torque during operation of the drive unit on a test stand, and in that actuating dynamics of the drive unit are taken into account in the control by means of a transfer function by correcting the desired values of the control with the transfer function or in that for controlling the inner effective torque or the effective torque of the drive unit, a feed forward control of a manipulated variable of the drive unit is used.

Abstract: In order to improve the identification of system parameters of a test setup of a test bench, in particular in terms of the quality of the identification, there is provision for the test setup (PA) to be dynamically excited on the test bench (1) by virtue of a dynamic input signal (u(t)) being applied to the test setup (PA) and, in the process, measured values (MW) of the input signal (u(t)) of the test setup (PA) and of a resultant output signal (y(t)) of the test setup (PA) being recorded, a frequency response (G(?k)) of the dynamic response of the test setup (PA) between the output signal (y(t)) and the input signal (u(t)) being determined from the recorded input signal (u(t)) and output signal (y(t)) using a nonparametric identification method, a model structure of a parametric model that maps the input signal (u(t)) onto the output signal (y(t)) being derived from the frequency response (G(?k)), the model structure and a parametric identification method being used to determine at least one system paramete

Abstract: A filter that is capable of filtering a noisy, periodic measurement signal having oscillations at a variable fundamental frequency and harmonic oscillation components of the fundamental frequency. The measurement signal is subjected to low pass filtering in a low-pass filter of the filter with a cutoff frequency greater than the fundamental frequency. A harmonic oscillation component of the measurement signal as an n-fold of the fundamental frequency is determined in at least one self-adaptive harmonic filter of the filter. The at least one harmonic oscillation component is added to the low-pass-filtered measurement signal, the resultant sum is substracted from the measurement signal, and the resultant difference is used as input into the low pass filter. The measurement signal subjected to low pass filtering in the low-pass filter is output by the filter as a filtered measurement signal.

Abstract: A dynamic system for an observer for estimating the internal effective torque of a torque generator, which can also process unfiltered measurement signals and is capable of mapping vibration effects in the estimated effective torque. An observer is designed with observer matrices and with an unknown input. The observer receives at least one noisy measurement signal of the input vector and/or the output vector. The observer estimates the state vector and the effective torque therefrom as unknown input in that the matrix, which determines the dynamic of the observer error as a difference between the state vector and the estimated state vector. The eigenvalues of this matrix lie in a range f2/5>?>5·f1, wherein f1 is the maximum expected change frequency of the at least one measurement signal, and the noise in the at least one measurement signal influences the frequency band which is greater than the frequency f2.