This paper presents a new tape hinge for attenuating the deployment shock of a satellite solar array. This hinge uses the Martensite detwinning of Shape Memory Alloy (SMA). To attenuate the deployment shock, a NiTi SMA strip is assembled between two curved steel strips. The attenuation performance of the hinge is analyzed using a SMA detwinning constitutive equation. A prototype of the hinge is manufactured and its characteristics are measured in a bending test and in a deployment test. Finally, the deployment performance of the prototype hinge is investigated on a satellite model. It is shown that the new SMA damped tape hinge can effectively minimize the deployment shock and dynamic perturbation while also maintaining suitable deployment performance.
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http://dx.doi.org/10.1063/1.4943073 | DOI Listing |
Adv Sci (Weinh)
December 2024
Graduate School of Biomedical Engineering, Faculty of Engineering, and Tyree Institute of Health Engineering (IHealthE), UNSW Sydney, Kensington Campus, Sydney, NSW, 2052, Australia.
Hemodynamic stabilization is crucial in managing acute cardiac events, where compromised blood flow can lead to severe complications and increased mortality. Conditions like decompensated heart failure (HF) and cardiogenic shock require rapid and effective hemodynamic support. Current mechanical assistive devices, such as intra-aortic balloon pumps (IABP) and extracorporeal membrane oxygenation (ECMO), offer temporary stabilization but are limited to short-term use due to risks associated with prolonged blood contact.
View Article and Find Full Text PDFVascular
December 2024
Division of Cardiology and Interventional Cardiology, MedStar Health: Heart and Vascular Institute at MedStar Washington Hospital Center, Washington, DC, USA.
Heart Fail Rev
December 2024
Department of Interventional Cardiology, Cardiovascular Institute, Erasmus University Medical Center Rotterdam, Office Nt-645, Dr. Molewaterplein 40, Thoraxcenter, Rotterdam, 3015 GD, The Netherlands.
Cardiogenic shock related to acute myocardial infarction (AMI-CS) remains a severe condition associated with a high risk of mortality despite increased availability of primary percutaneous coronary intervention and improvements in pharmacologic and device-based therapy. The results of the DanGer Shock trial stand out compared with the outcomes of the previous trials and mark the first mechanical circulatory support (MCS) strategy to show a benefit in patients with AMI-CS, a population that has always been challenging to study. Notably, negative findings from previous trials may mask positive treatment effects in specific subgroups and patient category.
View Article and Find Full Text PDFMil Med
November 2024
Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA.
Introduction: Timely identification of the need for lifesaving intervention in battlefield conditions may be improved through automated monitoring of the injured warfighter. Technologies that combine maximal noninvasive insight with minimal equipment footprint give the greatest opportunity for deployment at scale with inexperienced providers in forward areas. Finger photoplethysmography (PPG) signatures are associated with impending hemorrhagic shock but may be insufficient alone.
View Article and Find Full Text PDFMed Biol Eng Comput
November 2024
Innovision LLC, Dayton, OH, 45440, USA.
Neck injuries from parachute opening shock (POS) are a concern in skydiving and military operations. This study employs finite element modeling to simulate POS scenarios and assess cervical spine injury risks. Validated against various conditions, including whiplash, the model replicates head/neck kinematics and soft tissue responses.
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