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Machinery health prognostics: A systematic review from data acquisition to RUL prediction

Arthur Chickering is Distinguished Professor of Higher Education at Memphis State University. On leave from the Directorship of the Center for the Study of Higher Education at Memphis State, he is Visiting Professor at George Mason University. Zelda Gamson is a sociologist who holds appointments at the John W. McCormack Institute of Public Affairs at the University of Massachusetts-Boston and in the Center for the Study of Higher and Postsecondary Education at the University of Michigan.

Seven Principles for Good Practice in Undergraduate Education: Faculty Inventory. Institutional Inventory.

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Principles Of Heat Transfer In Porous Media

Heat and mass transfer in packed beds

The trochoidal gear pump, also known as gerotor, owing to its remarkable advantages compared to other hydraulic pumps is chosen for many engineering applications. As each application is unique, the...

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Methodology based on best practice rules to design a new-born trochoidal gear pump:

This paper describes a numerical analysis of the dynamics of the shaft in the journal bearing of a gear pump. The modulus and direction of the load is a function of the relative position of the gears, causing a precession motion around an equilibrium position. The mean load is the function of the working pressure of the gear pump. The numerical analysis presented in this paper combines the equation of motion of the journal-gear set, based on the linearization of the fluid film load, with calculation of the load due to the pressure distribution on the gears. The damping and stiffness coefficients for the motion equation are calculated with the distributions around the shaft of the pressure and its derivatives. These distributions are calculated from the Reynolds equations using an in-house 2D finite element code with quadrangular elements; the equation of motion is solved with a fifth-order Runge-Kutta scheme. The results provide the stabilized position of the shaft for certain conditions, and allow limitation of the working pressure and the angular velocity of the pump in order to minimize, or to avoid, metal-metal contact and consequent wear of material. The results are compared with experiments and previously reported numerical results.

Numerical Analysis of the Shaft Motion in the Journal Bearing of a Gear Pump

In the last few years, wall shear stress (WSS) has arisen as a new diagnostic indicator in patients with arterial disease There is a substantial evidence that the WSS plays a significant role, together with hemodynamic indicators, in initiation and progression of the vascular diseases Estimation of WSS values, therefore, may be of clinical significance and the methods employed for its measurement are crucial for clinical community Recently, four-dimensional (4D) flow cardiovascular magnetic resonance (CMR) has been widely used in a number of applications for visualization and quantification of blood flow, and although the sensitivity to blood flow measurement has increased, it is not yet able to provide an accurate three-dimensional (3D) WSS distribution The aim of this work is to evaluate the aortic blood flow features and the associated WSS by the combination of 4D flow cardiovascular magnetic resonance (4D CMR) and computational fluid dynamics technique In particular, in this work, we used the 4D CMR to obtain the spatial domain and the boundary conditions needed to estimate the WSS within the entire thoracic aorta using computational fluid dynamics Similar WSS distributions were found for cases simulated A sensitivity analysis was done to check the accuracy of the method 4D CMR begins to be a reliable tool to estimate the WSS within the entire thoracic aorta using computational fluid dynamics The combination of both techniques may provide the ideal tool to help tackle these and other problems related to wall shear estimation

/pdf/estimation-of-wall-shear-stress-using-4d-flow-cardiovascular-1c1tmlmtf6.pdf

Estimation of wall shear stress using 4d flow cardiovascular mri and computational fluid dynamics

Experimental study on the impulsion port of a trochoidal wheeled pump

The movement of the shaft of a driven gear in a gear pump is experimentally studied. Three different methods are considered, and the use of a laser micrometer measurement method is validated. In order to use the laser micrometer, some modifications are made to the gear pump. Experimental results for different working pressures and rotational velocities are shown. For a low nondimensional working pressure, defined in a similar way as the Sommerfeld load, experimental and numerical results agree very well for relative eccentricity. Nevertheless, experimental results made clear that the role of the lateral plate of the pump is very important for high nondimensional working pressure. A value of 100 is given for the critical nondimensional working pressure in order to avoid wear and slant in the lateral plate. Frequency analysis of the outlet pressure, as well as the precise measurement of the wear in the pump case, support experimental observation of the inability of the journal to retain the shaft for high nondimensional pressure.

P. J. Gamez-Montero

Papers

Methodology based on best practice rules to design a new-born trochoidal gear pump:

Numerical Analysis of the Shaft Motion in the Journal Bearing of a Gear Pump

Estimation of wall shear stress using 4d flow cardiovascular mri and computational fluid dynamics

Experimental study on the impulsion port of a trochoidal wheeled pump

Experimental Study of the Shaft Motion in the Journal Bearing of a Gear Pump