Abstract:Proper orthogonal decomposition (POD) is an effective statistical technique for data reduction and feature extraction of the random field including the wind field. This paper introduces the theory of the POD and illustrates engineering of structures. Using the POD technique, it is shown that wind pressure data can be accurately reconstructed with a limited number of modes using the wind pressure data from wind tunnel test. Comparing the reconstructed values by POD with the original measured values from the wind tunnel test both in the time and frequency domains, it is concluded that the proper orthogonal decomposition(POD) is an efficient and practical technique for deriving the random wind pressure field from limited known data as shown in the pitched roof example in this paper.
According to the periodic structure of the plate-fin heat exchanger, 3D model of the heat exchanger is established which simplifies the computation amount of the numerical simulation on flow field and temperature field. The relationship of fluid velocity, temperature, pressure drop and heat transfer coefficient is analyzed. The flow and heat transfer characteristics can be well predicted. Based on the simulation results, the conclusion makes reference to the design of plate-fin heat exchanger.
This paper takes the new type of mining truck bucket as research object and analyzes the strength and rigidity of the truck body in typical situations of dead load, swerve and slanting load. According to the analysis, the author will put forward four improvement measures in the stress concentration parts and give optimization design to those parts that have much allowance to the strength of the truck structure. The calculating result indicates that the improvement of the truck structure can significantly reduce the peak stress and improve the working life of the truck. In the premise of guaranteeing the strength of the truck structure, the weight of truck bucket induces from 30t to 27.1t achieves the goal of lightweight.
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