4 publications
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Evaluation of Acceleration Signal Frequency Results on Bearing Shell Non-destructive Testing, Ultrasonic Waves, SimulationBy Esmaeil Mirmahdi, Aliasghar Ghamari Totmaj
Abstract: Bearings are used in many rotary machines. Defects in them can cause car breakdowns, loss of production, and even catastrophic accidents. This makes them difficult to maintain and will make it costly to repair and maintain. Therefore, detecting defects in bearing vibrations is an important issue for the industry. On the other hand, error-related frequencies may be identified as discrete frequency lines, and therefore error characteristics cannot be easily identified.For …
Published in Trends in Machine design · Vol. 8, Issue 1, 2021 · pp. 42–47 Read article →
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Measurement of Defects in Car Bearings and Its Effect on Ultrasonic WavesBy Esmaeil Mirmahdi, Mohammad Nazemi, Hossein Mohammadi, Ali Maroufi, Mohammad Hashemipour
Abstract: As one of the defects of roller bearings due to intermittent coupling forces and external impact loads,surface cracks due to corrosion or wear may have many defects for rotating machines. Surfacecracking on the bearing or its ball is one of the important factors in the efficiency of the bearing andits opening. It is useful to study these cracks and identify the type and size of these cracks for bearingsused in …
Published in Trends in Mechanical Engineering & Technology · Vol. 11, Issue 1, 2021 · pp. 44–49 Read article →
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Modeling and Acoustic Analysis of Noise Vibration in Automotive Gearbox by Non-destructive TestingBy Esmaeil Mirmahdi, Mohammad Hashemi Pour
Abstract: A gearbox is used for transferring power from the engine to the wheels. Predicting the vibration and noise radiation from a dynamic system like a gearbox gives designers an insight early in the design process. It was conducted experimental and modeling of vibration and noise for magnitude and pressure level variations in a Peugeot 206 automotive 5-speed gearbox. It was extract vibration data related to different periodic processing and then …
Published in Journal of Experimental & Applied Mechanics · Vol. 11, Issue 3, 2020 · pp. 54–63 Read article →
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Experimental Test for the Replacement of Aluminum Sheets Instead of Steel Sheets in the Automotive Industry and the Effect of this ReplacementBy Esmaeil Mirmahdi
Abstract: Nowadays, vehicles cause air pollution due to high fuel consumption, and it has a direct relationship with increasing vehicle weigh. The increase of pollution will lead to rise in greenhouse gases that will cause special damages during a long period time. In this paper, instead of using steel sheets, aluminum sheets are proposed for the vehicle body and its interior components. It is attractive to increase its speed by reduction …
Published in Journal of Automobile Engineering and Applications · Vol. 7, Issue 3, 2020 · pp. 34–39 Read article →