The NASA In-Space Propulsion (ISP) program has been sponsoring system design development and hardware demonstration activities of solar sail technology over the past 27 months. Validation of a 10-m system solar sail system is complete, and efforts to demonstrate and evaluate a 20-m system are underway. Descriptions of the evolution of the design, results of functional testing to date, and analy...

Real-time substructuring is a novel hybrid method for the dynamic testing of complex engineering structures. This technique involves creating a hybrid model of the entire structure by combining an experimental test piece with the remainder of the structure being modelled numerically. The essence of this technique is to emulate the dynamic behaviour of the complete original structure by using re...

Recent advances in radar techniques and systems have favoured the development of microwave interferometers, suitable for the non-contact vibration monitoring of large structures. The paper addresses the application of microwave remote sensing to the measurement of the vibration response in the stay-cables of cable-stayed bridges. The reliability and accuracy of the proposed technique were inves...

Dynamic testing was performed on a pool of guitars in the production facility of a major guitar manufacturer. The production process is highly automated, with the goal of improving quality and reducing build variation. However, no objective metric has yet been used to quantify the differences in the dynamic response of the instruments. We performed dynamic testing on the assembly line to measur...

This paper presents a dynamic technique for statistically estimating three program characteristics that aect a program's computational behavior: (1) the probability that a particular section of a program is executed, (2) the probability that the particular section aects the data state, and (3) the probability that a data state produced by that section has an eect on program output. These three ...

Purpose: To determine the more effective ankle brace (lace-up or Aircast ankle brace) at providing dynamic postural control in volleyball players with unstable ankle under functional fatigue conditions. Methods: Subjects of this study participated in 3 separate testing sessions and did not use or used a different brace at each session i.e. no brace (NB), lace-up ankle brace (AB), and Airca...