A young man presented with a perineal mass that was found to be secondary to partial priapism of the proximal corpora cavernosa. This ia a rare condition with only 2 previously recorded cases in the urologic literature. Definitive treatment required a corpus cavernosum-spongiosum shunt. The patient has had a good recovery and was able to resume sexual activity.
With the aim of connecting the subject Dynamics with the real world, an educational software has been developed to assist teaching the course to first-year undergraduate industrial engineering students. The software simulates the 3D movement of the oscillating group of a washing machine that includes some of the familiar elements of a mechanical system: motors, pulleys, springs, or shock absorbers. The student is able to set up, run, and analyze the output of the mechanical model, which enhances the students' appreciation of the potential and utility of the mathematical model obtained for a mechanical system and helps them to reinforce some relevant mechanical concepts by changing the input parameters of a specific system. ß
In horizontal-axis washing machines, the front gasket as well as the damping system are crucial owing to the possible collision of the tub with the housing during the transient period. However, most dynamic models for predicting tub motion focus on the steady state and consider only the suspension system without including the gasket. We conducted an experimental study to analyze the effect of the gasket on the transient motion of the tub. The results obtained indicate the necessity of implementing the gasket in the multibody model of a washing machine to accurately predict the tub behavior during this period. The gasket model is formed by a combination of Voigt elements. Stiffness parameters are determined using a load cell, and damping factors are estimated using a process that integrates Adams/View, Matlab optimization algorithms, and displacement measurements that are taken using accelerometers. A D-optimal design used to predict the effect of the gasket parameters reveals that the tub displacement is most sensitive to the changes in linear stiffness in the transversal direction. Finally, the model of the gasket provides a better approach for predicting the tub movement during resonance that can be used in the design phase to avoid tub collision.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.