Time-Frequency Analysis.

Methods of Feasible Directions. By G. Zoutendijk. Pp. 126. 30s. 1960. (D. van Nostrand Co. London)

http://dilbert.engr.ucdavis.edu/~suku/xfem/papers/xfem-abqefm.pdf

An Abaqus implementation of the extended finite element method

The numerical simulation of fatigue crack growth using extended finite element method

Engineering is evolving in the same way than society is doing. Nowadays, data is acquiring a prominence never imagined. In the past, in the domain of materials, processes and structures, testing machines allowed extract data that served in turn to calibrate state-of-the-art models. Some calibration procedures were even integrated within these testing machines. Thus, once the model had been calibrated, computer simulation takes place. However, data can offer much more than a simple state-of-the-art model calibration, and not only from its simple statistical analysis, but from the modeling and simulation viewpoints. This gives rise to the the family of so-called twins: the virtual, the digital and the hybrid twins. Moreover, as discussed in the present paper, not only data serve to enrich physically-based models. These could allow us to perform a tremendous leap forward, by replacing big-data-based habits by the incipient smart-data paradigm.

/pdf/virtual-digital-and-hybrid-twins-a-new-paradigm-in-data-31maeyy42f.pdf

Virtual, Digital and Hybrid Twins: A New Paradigm in Data-Based Engineering and Engineered Data

http://dilbert.engr.ucdavis.edu/~suku/xfem/papers/xfem-abqijss.pdf

Extended Finite Element Method for Fretting Fatigue Crack Propagation

Acoustic behavior of circular dual-chamber mufflers

Acoustic behaviour of elliptical chamber mufflers

Acoustic attenuation performance of perforated dissipative mufflers with empty inlet/outlet extensions

The study of the three-dimensional acoustic field inside an exhaust muffler is usually performed through the numerical solution of the linearized equations. In this paper, an alternative procedure is proposed, in which the full equations are solved in the time domain. The procedure is based on the CFD simulation of an impulsive test, so that the transmission loss may be computed and compared with measurements and other numerical approaches. Also, the details of the flow inside the muffler may be studied, both in the time and the frequency domains. The results obtained compare favorably with a conventional FEM calculation, mostly in the ability of the procedure to account for dissipative processes inside the muffler.

Francisco D. Denia

Papers

Extended Finite Element Method for Fretting Fatigue Crack Propagation

Acoustic behavior of circular dual-chamber mufflers

Acoustic behaviour of elliptical chamber mufflers

Acoustic attenuation performance of perforated dissipative mufflers with empty inlet/outlet extensions

A cfd approach to the computation of the acoustic response of exhaust mufflers