If the screw speed of parallel pressure stabilization apparatus is varied corresponding to the pressure fluctuation, the pressure and output fluctuation of extrusion can be fully compensated.

Even with the stabilization of financial markets in many developed economies, unemployment and under-utilization of capacity continue to rise, putting downward pressure on the global economy.

Commencing with one brief joist rack optimizing design issue in the engineering practice, this paper discussed that optimizing design of two bar joist rack structures about pressure bar stabilization.