Temperature and pressure distribution analysis on deformable short hydrodynamic bearings

This paper presents a discussion on the study of thermal and elastic effects resulting from the support bearing. It was proposed a mathematical model based on the short bearings equations within the cavitation region, using the principle of mass continuity. Then, the used equations are deduced from [1] and energy equations applying a modified solution for the Ocvirk’s solution [2]. All the equations are numerically solved by the Backward Finite Difference Method. In addition of the treatment of fluid mechanics, this paper agrees the thermal analysis on bearings discussed by [3]. To calculate the deformation of the structure, it was used a Finite Element Model for a specific geometry and an evaluation of the variation of the pressure field is done to determinate how this difference affects other fluid properties. Finally, it was calculated within the full model to predict the short bearing properties. Comparing the similarities among the presented by [4] and the calculated ones, the mean results present a difference of 2.33% between the maximum pressure, and one about 1.78% for eccentricity ratio for a length-diameter bearing ratio (LDR) of ½. These results demonstrates that the model has an interesting relevant and accurate approximation for experimental data, reducing the time for calculate some initial properties or making qualitative decisions about its operation.The authors gratefully acknowledge the funding by Mechanical Engineering Department of the Polytechnic School, USP, Brazil, and the scholarship provided by CAPES

Applications residual control charts based on variable limits

The main purpose of this paper is to verify the stability of a productive process in the presence of the effects of autocorrelation and volatility, in order to capture these characteristics by a joint forecast model which produces residuals that are evaluated by a control chart based on variable control limits. The methodology employed will be the joint estimation of the residuals by ARIMA – ARCH models and the conditional standard deviation from residuals to establish the chart control limits. The joint AR (1)-ARCH (1) model shows that an appropriate forecasting model brings a great contribution to the performance of residual control charts in monitoring the stability of industrial variables using just one chart to monitor mean and variance togetherinfo:eu-repo/semantics/publishedVersio

Métodos para produção de mudas de jatobá (Hymenaea courbaril Linnaues) e colubrina (Colubrina glandulosa Perk) em condições de viveiro na Amazônia.

O objetivo deste trabalho é produzir mudas de Hymenaea courbaril e Colubrina glandulosa em diferentes recipientes além de avaliar os parâmetros de crescimento, para poder se estabelecer um protocolo de produção para mudas de boa qualidade com baixo custo e em menor tempo no viveiro

Influência dos fatores edáficos no crescimento da Bertholletia excelsa H.B.K. na Amazônia.

O objetivo deste trabalho foi determinar a influência dos fatores edáficos (físicos e químicos) na variabilidade do crescimento da Bertholletia excelsa H.B.K. (castanheira-do-brasil) em distintas condições de solo na Amazônia

Embrapa agrienergy and bioinformatics.

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