This paper reviews the design of a combination variable I fixed-step port unloader system for moderate capacity refrigeration screw compressors. The general specification of an unloader system to meet application requirements and specific issues of port and flowpath design are discussed. The paper demonstrates use of a comprehensive compressor simulation and a commercial pipe flow analysis prog...

Introduction Gait modification is frequently used as conservative management in knee osteoarthritis (OA). Knee orthoses, such as knee sleeves and unloader knee braces, are nonpharmacological treatment for gait modification in symptomatic knee OA. Previous studies lack systematic investigation of biomechanical effect and functional capacity, particularly walking capacity. This study investigated...

This paper establishes a granular mechanics model for the stable movement of material particle group in vertical screw unloader with mechanics, continuum and theory innovatively proposed hypothesis that speed changes radially spiral groove. Through analysis movement, characteristic parameters are determined. The study found free surface type longitudinal section conveyor its identification solu...

BACKGROUND Unloading knee braces can provide good short-term pain relief for some patients with unicompartmental osteoarthritis (UOA). Their cost is relatively small compared with surgical interventions. However, no previous studies have reported their use over a duration of 5 years or more. METHODS Up to 8 years of prospective data were collected from 63 patients who presented with UOA. Afte...

This study presents a pilot investigation into the effectiveness of unloader knee braces for osteoarthritis subjects. The unloading effect of the brace was modeled by applying a knee abduction moment as a function of the brace deflection angle, eliminating the need for load sensors on the knee brace. The use of a detailed musculoskeletal model provided the means to evaluate the relative importa...