This study presents results concerning the vibrational characteristics of a mild steel and carbon/epoxy composite hollow shaft system under different boundary conditions. Finite element analysis has been deployed for critical investigation. The effect of cutout profile and its geometric location over natural frequency and mode shape is studied in detail. From the results, it is clear that the introduction and increase in the number of cutouts leads to a drastic reduction in the natural frequency of the system for both the cases. Moreover, the geometric location of cutouts has a predominant effect in deciding natural frequencies and corresponding mode shapes. The results presented in this study will yield higher levels of interest for engineers dealing with topology optimization problems, where material removal is inevitable.
The research in this paper is a sequel of an earlier work by the author in which experimental and CFD results were compared for an absorber plate made of iron with and without fins for two flow rates. The research yielded a good comparative result between the experimental and computational process for an optimized flow rate and the effect of the fins. The objective of this paper is to verify the effect of the overlay composite absorber plate material on a solar air heater through experimental and computational fluid dynamics. The experimental setup consists of an absorber plate as an overlay composite of aluminum and copper for enhanced heat transfer. Experiments and CFD analysis were done in three configurations. In configuration one, only the aluminum absorber plate with fins was considered. In configuration two, the overlay composite was considered with copper on the top and aluminum at the bottom as fins, and in configuration three, the overlay composite was considered with aluminum at the top and copper at the bottom as fins. A transient 8 hours CFD analysis was carried out using these configurations. While validating the results it was found that the overlay absorber plate Cu-Al was capable of generating a high outlet temperature Max of 88 °C and capable of generating 83 °C air for 5 hours and had good thermal efficiency when compared to the other materials in the other two configuration. It was found that experimental and computational analysis were in very close agreement, and the margin of error between the experimental and computational processes was less than 8 %.
Hollow shafts are typically deployed in real world engineering application where strength to density ratio is highly desirable. Introduction of cutouts will also assist in achieving the same, where further material reduction is inevitable. This research work mainly focusses on assessing the impact of introducing cutouts on a hollow shaft system experimentally, followed by numerical validation. In this study the vibrational characteristics of a hollow shaft made up of linear elastic material is compared with a composite one for five different geometric profiles. Obtained results clearly reveal that introduction of cutouts and composite material significantly reduces the natural frequency of the system. Also, the experimental results are well in line with the values derived from the finite element method.
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