Shaft fatigue testing involves long test times (~3 months), high energy consumption and high test equipment maintenance costs owing to the high bending and twisting moments required (~1600 Nm), high number of cycles (~107) and large sample sizes (~30). To reduce testing time, we designed, manufactured and evaluated a resonant plate test bench. Using finite element analysis and topological optimization, we redesigned the traditional resonant flat plates for higher resonant frequency and lower deflection at the plate free ends. We found that the optimal topology is an I‐beam; it doubles the frequency of flexion tests, up to 100 Hz, and exhibits 2 mm of deflection under a load of 1 kN. To measure the moments induced on the shaft sample during testing, we measured the surface deflection of the resonant plates. Tests on a calibration axle showed that the induced shaft moment has very high linear correlation (R2 > 0.99) with the plate's surface deformation. We used our test bench to evaluate fatigue resistance for a type of crankshaft manufactured by a local company. We found that their fatigue resistance limit was 1250 Nm at 107 cycles and that their mean useful life was 104 cycles when they are subjected to a 1400 Nm moment. These results agree with previous results on this type of crankshaft using other methods.
Currently, the number of companies that provide diagnosis, repair and maintenance services to the electronic control modules — ECMs of the vehicles is very limited. Even though the demand of the service is still unsatisfied, the possibility of expansion of the existing companies is limited by the need of an engine simulator to semi-automate the ECMs diagnosis process. To fulfill this requirement, the present paper describes the design, implementation and testing of an electronic device that simulates the electrical signals generated by the sensors and transducers commonly installed on engines. The device was programmed to simulate different models of commercial engines and to perform automatically the standard procedures followed to identify the most common failures of the ECMs. This device incorporates systems to guarantee the safety of the information gathered during the diagnosis process and the physical integrity of the ECMs being diagnosed.
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