BACKGROUND Lower extremity stiffness is thought to be an important factor in musculoskeletal performance. However, too little or too much stiffness is believed to increase the risk of musculoskeletal injury. PURPOSE To provide a current update of the lower extremity stiffness literature as it pertains to both performance and injury. SUMMARY It appears that increased stiffness is beneficial ...

Free and forced bending vibration of damped nonlocal nano-beams resting on an elastic foundation is investigated. Two types damping models, namely, strain-rate-dependent viscous velocity-dependent are considered. A frequency-dependent dynamic finite element method developed to obtain the response. Frequency-adaptive complex-valued shape functions used for derivation stiffness matrix. It shown t...

Widespread introduction into the industry of layered structures, in particular three-layer plates, shells and is impossible without effective methods their strength reliability. High rigidity at relatively low weight damping thermal insulation properties these structures have led to use modern construction mechanical engineering. Three-layer plates shells, as a rule, are combination materials h...

Nonlinear vibration behavior of beam is an important issue of structural engineering. In this study, a mathematical modeling of a forced nonlinear vibration of Euler-Bernoulli beam resting on nonlinear elastic foundation is presented. The nonlinear vibration behavior of the beam is investigated by using a modified multi-level residue harmonic balance method. The main advantage of the method is ...

The aim of this study is to investigatethe effective parameters on vibrations of circular cylindrical shells with fixed rotary speed andresting elastic foundation by means of analytical and finite element numerical simulation. First, the governing equations are derived using the theory of Donnell, considering the centrifugal forces,Coriolis acceleration, and the initial annular tension. Then, t...

  In this article, vibration analysis of an Euler-Bernoulli beam resting on a Pasternak-type foundation is studied. The governing equation is solved by using a spectral finite element model (SFEM). The solution involves calculating wave and time responses of the beam. The Fast Fourier Transform function is used for temporal discretization of the governing partial differential equation into a se...