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- Circulation pump (1)
- Condition monitoring (1)
- Fatigue Life Evaluation (1)
- Fourier transformation (1)
- Impeller clogging (1)
- Impeller faults (1)
- Magnetics (1)
- Metallic Materials (1)
- Motor current signature analysis (1)
- Non-Destructive Testing (1)
Pumps have a wide range of applicat ions. Methods for fault detection of motors are
increasingly being used for pumps. In the context of this paper, a test bench is built to investigate
circulation pumps for faults. As a use case, the fault of impeller clogging was first measured and
then examined with the help of motor current signature analysis. It can be seen that there are four
frequencies at which there is an increase in amplitude in case of a fault. The sidebands around the
supply frequency are in particular f ocus. The clogging of three and four of a total of seven channels
leads to the highest amplitudes at the fault frequencies. The efficiency is reduced by 9 to 15% in case
of faulty opera tion. These results indicate that the implementation of fault detection algorithms on
the pump electronics represents added value for the pump operator. Furthermore, the results can be
transferred to other applications.
Weight-optimized component design as well as a reliable estimation of the lifetime of metallic materials and components requires a comprehensive understanding of fatigue processes and a systematic investigation of the underlying fatigue behavior. Therefore, nondestructive testing methods, digitalization of measurement techniques as well as signal processing can be combined with a short-term procedure in order to acquire potentially more information about fatigue processes, while experimental effort and costs are reduced significantly. This leads not only to considerable advantages over conventional methods for determining S-N curves, but also over established short-term procedures, due to the possibility of applying this information from just a few specimens to attain fatigue life calculations. The StressLifetc approach is a new short-term calculation method which considers the nonlinear relation between the elastic, elastic-plastic and plastic portion of the material response in the deformation process. Within the scope of the present work, the change in temperature of SAE 1045 (C45E) specimens was measured during fatigue tests via an infrared camera in order to feed the thermal response back into the new StressLifetc approach for a reliable fatigue life calculation.