Abstract: A head unit device for controlling motion of an object includes a chamber filled with a shear thickening fluid (STF) and a piston. The piston is housed within the chamber and exerts pressure against the STF from a force applied to the piston from the object. The STF is configured to have a decreasing viscosity in response to a first range of shear rates and an increasing viscosity in response to a second range of shear rates. The piston includes at least one piston bypass between opposite sides of the piston that controls flow of the STF between the opposite sides of the piston to selectively react with a shear threshold effect of the first range of shear rates or the second range of shear rates.

Abstract: A radome constructed using a rigid or semi-rigid foam core and sandwich construction is described. The foam core radome virtually eliminates water absorption problems associated with present technology radomes. The radome also provides greater impact strength and consistent, high radar transparency without sacrificing weight and structural stability, thereby providing a much longer service life in moisture/impact critical environments. Preferably, the radome includes a vinyl rigid closed-cell foam core consisting of a polymeric alloy of a cross-linked aromatic polyamide urea and a linear vinyl polymer.

Abstract: This invention relates to punch presses having a transfer die and a work transfer mechanism for advancing individual workpieces progressively through successive tooling stations of such die at high speed comprising dual intermittent-feed transfer bars slidingly mounted for rotary movement and lifting of said workpieces off the tooling stations of said die, and associated clampbars which retain each workpiece on the transfer bars by free retention of the edges of the workpiece during transfer movement, and which transfer bars deposit said workpieces at the next successive tooling station by rotary movement to release the lifting support of each workpiece from below the same and from the free-retention clamping thereof from above in readiness for the next tooling operation.