Computational design of accelerated life testing applied to frozen green beans

R. C. Martins, C. L. M. Silva*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Three different accelerated life tests (ALT) were designed by computer simulation to investigate their practical applicability to quantify kinetics of quality loss in frozen stored foods. Heat transfer and quality degradation inside a green bean were simulated, using a spectral finite element method (SFEM), to develop pseudo-experimental data. Temperature fluctuations inside a refrigerator were simulated, by a piecewise linear stochastic differential equation, and integrated into the SFEM program. Thereafter, the simulated data was treated by non-linear regression analysis to estimate the kinetic parameters. The different ALT tests were then compared in terms of precision and accuracy. This study shows that temperature fluctuations, inside a refrigerator, influence the accuracy of the kinetic estimates, and if the temperature spectrum is used to derive kinetic estimates, it is possible to apply accurately ALT methodologies to frozen foods.

Original languageEnglish
Pages (from-to)455-464
Number of pages10
JournalJournal of Food Engineering
Issue number4
Publication statusPublished - 1 Oct 2004


  • Accelerated life testing
  • Frozen stored foods
  • Green beans
  • Kinetics quantification
  • Simulation


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