Fastener Lock

Compliant Control of Threaded Fastener Insertion

Controlled compliance and accommodation matrix techniques are considered for robust insertion of threaded fasteners. Errors in translational positioning are shown to be easily corrected. Errors in the angle of tilt between the threaded parts are shown to be much more diicult to correct and constrain the region of convergence for simple linear techniques.

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Figure 2. Current Path and Sparking in Typical Fastener during Lightning Discharge Figure 1. Cross Section of Typical Fastener

! ABSTRACT —;> Lightning protection of modern aerospace vehicles must prohibit sparking in critical fuel vapor areas. In the past, it has been particularly difficult to keep mechanical fasteners from sparking during a lightning event. Attempts to seal off the fasteners from the critical fuel vapor area by manual application of sealant material have proven to be ineffective due to gaps and voids...

RH Lock: A Scalable Hierarchical Spin Lock

Scalable architectures with non-uniform memory access time (NUMAs) have gained increased popularity in recent years. The increased scalability have increased the demand for scalable lock implementations, such as the queue-based locks of Mellor-Crummey and Scott (MCS lock), and of Craig, Landin and Hagersten (CLH lock). This paper demonstrates that the first-come first-served nature of queue-bas...

Power Lock

The concept of Grid computing has been in the making since the 1960’s, but it took quite some time up to the late 1990’s, with the advent of faster networks and better understanding of distributed computing, that some of those concepts were realized. Even now, the world’s computer networks are very primitive as compared to other networks, such as the electrical power grid, the telephone network...