The nonlinear behavior of spudcan foundation will lead to the decrease rotational stiffness spudcan, leading increase stress at critical member offshore jack-up drilling platform. Secant is used represent value linear model when soil changes from elastic elasto-plastic and then plastic. In this paper, “wished in-place” small strain finite element analysis (SSFE) simulate load-displacement respo...

We introduce two essential building blocks with binary stiffness for mechanical digital machines. The large scale fully compliant mechanisms have rectilinear and rotational kinematics use a new V-shaped negative structure to create extreme states of by static balancing. bistable switch allows us toggle between near-zero-stiffness high-stiffness states, effectively turning off on stiffness. A re...

The dynamics of wind turbine planetary gears with gravity effects are investigated using an extended harmonic balance method that includes simultaneous internal and external excitations. This method along with arc-length continuation and Floquet theory is applied to a lumped-parameter planetary gear model including gravity, fluctuating mesh stiffness, bearing clearance, and nonlinear tooth cont...

The goal of this study was to quantify the relative contributions of each muscle group surrounding the spine to vertebral joint rotational stiffness (VJRS) during the push-up exercise. Upper-body kinematics, three-dimensional hand forces and lumbar spine postures, and 14 channels (bilaterally from rectus abdominis, external oblique, internal oblique, latissimus dorsi, thoracic erector spinae, l...

A system of two meshing gears exhibits a stiffness that varies with the number of teeth in instantaneous contact and the location of the corresponding contact points. A classical Newtonian statement of the equations of motion leads to a solution that contradicts the fundamental principle of mechanics that the change in total energy in the system is equal to the work done by the external forces,...

The aim of this paper is to present a new six degree-of-freedom (dof) haptic device using two parallel mechanisms. The first one, called orthoglide, provides the translation motions and the second one produces the rotational motions. These two motions are decoupled to simplify the direct and inverse kinematics, as it is needed for real-times control. To reduce the inertial load, the motors are ...

Different spine models have placed the IAR at various locations in the spine; more commonly, the central region of the intervertebral disk, the middle region of the subjacent vertebra, and the central region of the vertebral body. A computer simulation model of the cervical spine (C2-T1) was developed to investigate sagittal plane kinematics for different placements of the vertebral axis of rot...