In this paper, the nonlinear oscillations induced by friction in a ball-on-socket system are investigated. The time response was obtained solving differential equations of friction-noise model finite element ball with multiple modes. different patterns motion were analyzed via bifurcation diagram, Poincare map, and recurrence plot. Lyapunov exponents discontinuous distributed contact calculated...

High-performance robot control is one of the most investigated topics in both research and industry. Being able to compensate for dynamics indeed major challenge. Joint friction commonly main issue, especially sensorless (i.e., no availability torque/force sensors) compliance-controlled robots interaction application purposes. The presented paper aims propose a methodology Cartesian impedance c...

Lubricin and hyaluronic acid (HA), molecular constituents of synovial fluid, have long been theorized to play a role in joint lubrication and wear protection. While lubricin has been shown to function as a boundary lubricant, conflicting evidence exists as to the boundary lubricating ability of hyaluronic acid. Here, we use colloidal force microscopy to explore the friction behavior of these tw...

OBJECTIVE To quantify the concentration of superficial zone protein (SZP) in the articular cartilage and synovial fluid of patients with advanced osteoarthritis (OA) and to further correlate the SZP content with the friction coefficient, OA severity, and levels of proinflammatory cytokines. METHODS Samples of articular cartilage and synovial fluid were obtained from patients undergoing electi...