Under the right parameters, flutter occurs in an airfoil when aerodynamic forces drive a dynamic structure to an oscillatory, possibly divergent condition. The presence of a rotational stiffness nonlinearity at the root of an all-moving airfoil has been shown to decrease the freestream velocity at which flutter occurs. Since this is a somewhat common configuration for flight structures and othe...

Traumatic damage to the brainstem occurs frequently when the brain skull complex experiences injurious loading especially during those traumatic situations that produce diffuse axonal injury (DAI). DAI has been shown to be dependent on load direction and correlated with regional tissue deformation in response to rotational inertial loads. Possible mechanisms for the selective vulnerability of t...

Five normal subjects (two females, three males) were evaluated twice on the same day, and five patients with low back problems (four females, one male) were evaluated with the A-ATM before and after each of two treatments, with approval by NJIT IRB. The ATM rotates a passive supine subject’s pelvis, collecting torsion data that plots a hysteresis loop. By measuring the displacement as the loads...

This paper is devoted to the kinematic design of a new six degree-of-freedom haptic device using two parallel mechanisms. The first one, called orthoglide, provides the translation motions and the second one, called agile eye, produces the rotational motions. These two motions are decoupled to simplify the direct and inverse kinematics, as it is needed for real-time control. To reduce the inert...

Abstract The performance of an optical system with sensitive line-of-sight (LOS) is influenced by rotational vibration. In view this, a design methodology proposed for passive vibration isolation in LOS. Rotational attributed to two sources: transmitted from the mounting base and generated modal coupling. Therefore, elimination caused coupling becomes important part system. Additionally, decoup...

BACKGROUND Rotational osteotomy is frequently indicated to correct excessive femoral anteversion in cerebral palsy patients. Angled blade plate is the standard fixation device used when performed in the proximal femur, but extensile exposure is required for plate accommodation. The authors developed a short locked intramedullary nail to be applied percutaneously in the fixation of femoral rotat...

Beams, made in brittle materials like concrete or cement, show increasing crack development during their service life due to mechanical and environmental loadings. This local damage can often be translated into reduction of the local bending stiffness values. This paper presents a scanning method to identify the local stiffness values of thin beams using experimentally measured resonance freque...

In this study, the buckling and free vibration of Timoshenko beams resting on variable elastic foundation analyzed by means of a new finite element formulation. The Winkler model has been applied for elastic foundation. A two-node element with four degrees of freedom is suggested for finite element formulation. Displacement and rotational fields are approximated by cubic and quadratic polynomia...

The development of local buckling in the web-post and the compressive regions around the openings of cellular beams is often a critical design consideration. The current buckling assessment of such scenario is still based on simplified models, which are calibrated against detailed finite element models only for specific geometries including layout and range of dimensions, Moreover, the direct u...

Methods of wide-field fluorescence microscopy for measuring membrane dynamics of living cells are described, including spectral imaging as well as anisotropy imaging of the membrane marker 6-dodecanoyl-2-dimethylamino naphthalene (laurdan). Plasma membranes are selected by illumination with an evanescent electromagnetic field and distinguished from intracellular membranes assessed by whole-cell...