Panel-fastening systems rely on a combination of oversized structural holes and nut-element float to accommodate panel removal and installation. Improvements in positional tolerances of tooling used to produce interchangeable panels, makes a new Panel Aligning Fastener System (PAFS) feasible.
PAFS differs from common panel fastening systems in that the access panel and its mating structure are treated as a stiff-spring system in which each fastener loads/unloads the spring system a small amount. With PAFS "pinning'' panels in place, it should be possible to design and manufacture improved, lighter weight, more efficient structure using fewer fasteners. Other advantages:
All male fasteners for a given panel can be identical, regardless of substructure thickness
The fastening system eliminates bending moment failures in the threads
Receptacle has no moving parts for high reliability
Improved fastener flushness
Improved fuel sealing (gasket chafing eliminated)
Inherent low cost
Panel hole misaligned with structure hole
With > 3 threads engaged, fastener becomes a jackscrew
Fastener chamfer engages receptacle barrel
Major diameter of bolt moves into the shear plane
Jim Landgrebe, Lockheed Martin Tactical Aircraft Systems, MZ 4266, Box 748, Fort Worth, TX 76101; (817) 763-2113.
Robots that walk have come a long way from simple barebones walking machines or pairs of legs without an upper body and head. Much of the research these days focuses on making more humanoid robots. But they are not all created equal.
The IEEE Computer Society has named the top 10 trends for 2014. You can expect the convergence of cloud computing and mobile devices, advances in health care data and devices, as well as privacy issues in social media to make the headlines. And 3D printing came out of nowhere to make a big splash.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This discussion will examine what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.