Plain correlation asymptotes to predict the center and mean temperatures and total heat transfer in simple solid objects with uniform surface temperature at limiting small-time conditions

Campo, Antônio; Sieres, Jaime; Macía, Yunesky Masip

doi:10.1016/j.ijheatmasstransfer.2018.10.098

Cited by 2 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additional comparisons were made for the dimensionless center and mean temperatures θmtrue(τtrue) and θctrue(τtrue) in a wall, cylinder, and sphere determined with accurate correlation equations in the small-time sub-regions by Campo et al. 14 In all cases, the comparisons for θctrue(τtrue) and θmtrue(τtrue) were considered of excellent quality.…”

Section: Presentation and Discussion Of Resultsmentioning

confidence: 99%

The Numerical Method of Lines facilitates the instruction of unsteady heat conduction in simple solid bodies with convective surfaces

Campo

2020

International Journal of Mechanical Engineering Education

Self Cite

View full text Add to dashboard Cite

The present study on engineering education addresses the Method of Lines and its variant the Numerical Method of Lines as a reliable avenue for the numerical analysis of one-dimensional unsteady heat conduction in walls, cylinders, and spheres involving surface convection interaction with a nearby fluid. The Method of Lines transforms the one-dimensional unsteady heat conduction equation in the spatial and time variables x, t into an adjoint system of first-order ordinary differential equations in the time variable t. Subsequently, the adjoint system of first-order ordinary differential equations is channeled through the Numerical Method of Lines and the powerful fourth-order Runge–Kutta algorithm. The numerical solution of the adjoint system of first-order ordinary differential equations can be carried out by heat transfer students employing appropriate routines embedded in the computer codes Maple, Mathematica, Matlab, and Polymath. For comparison, the baseline solutions used are the exact, analytical temperature distributions that are available in the heat conduction literature.

show abstract

Section: Presentation and Discussion Of Resultsmentioning

confidence: 99%

The Numerical Method of Lines facilitates the instruction of unsteady heat conduction in simple solid bodies with convective surfaces

Campo

2020

International Journal of Mechanical Engineering Education

Self Cite

View full text Add to dashboard Cite

show abstract

“…For the numerical integration, the Euler-Maclaurin summation formula can be used for a general analysis [22]. Furthermore, it is also useful for calculating the area of a periodic function.…”

Section: A Preliminary Of Numerical Integralmentioning

confidence: 99%

Velocity Control for Ripple Reduction in Permanent Magnet Synchronous Motors With Low Performance Current Sensing

2020

View full text Add to dashboard Cite

In this study, a velocity control method is proposed for minimizing velocity ripples in permanent-magnet synchronous motors with low-performance current sensing. The proposed method involves the use of desired currents, peak estimation, and a proposed tracking controller. The desired currents are used to achieve velocity control with only the current sensing. Peak estimation is performed to estimate the peak of the measured distorted current that occurs due to low-performance sensing. The proposed tracking controller is developed based on a proportional-integral controller using the estimated peak obtained from the measured currents. The proposed method aids in reducing velocity ripples and improving velocity tracking performance of permanent-magnet synchronous motors. The primary contribution of this method is the improvement of velocity-control performance with low-performance current sensing. The stability of the closed loop is proven by employing the input-to-state stable property. To verify the effectiveness of the proposed method, we performed simulations and experiments with different three cases. INDEX TERMS Velocity control, ripple reduction, peak estimation, low-performance current sensing, permanent-magnet synchronous motor.

show abstract

Plain correlation asymptotes to predict the center and mean temperatures and total heat transfer in simple solid objects with uniform surface temperature at limiting small-time conditions

Cited by 2 publications

References 11 publications

The Numerical Method of Lines facilitates the instruction of unsteady heat conduction in simple solid bodies with convective surfaces

The Numerical Method of Lines facilitates the instruction of unsteady heat conduction in simple solid bodies with convective surfaces

Velocity Control for Ripple Reduction in Permanent Magnet Synchronous Motors With Low Performance Current Sensing

Contact Info

Product

Resources

About