Pile groups are designed to sustain complex loads in various engineering. During the design of a pile group, obvious group effect should be considered for closely spaced groups. However, by different scholars varies, which makes it hard engineers consider group. In this study, finite element (FE) method is proposed advance our understanding variations effects developed researchers, based on con...

A tool is needed to track several mode shape estimates from iterative or repeated (variability) testing. Modal Assurance Criterion (MAC) is a well known modal vector comparison tool, however it can compare only two modal vectors at a time. A method to compare multiple samples of modal vector is presented The approach begins with mode shape correlation and correspondence. Pseudo orthogonality is...

Runners are often categorized as forefoot, midfoot or rearfoot strikers, but how much and why do individuals vary in foot strike patterns when running on level terrain? This study used general linear mixed-effects models to explore both intra- and inter-individual variations in foot strike pattern among 48 Kalenjin-speaking participants from Kenya who varied in age, sex, body mass, height, runn...

This paper studies the efficiency of subgrade stiffening next to the track as a mitigation measure for railway induced vibrations by means of a two-and-a-halfdimensional coupled finite element – boundary element methodology. The pyhsical mechanism is interpreted in the frequency–wavenumber domain, illustrating that the stiffened block of soil next to the track can act as a wave impeding barrier...

It is well established that many physical properties of DNA at sufficiently long length scales can be understood by means of simple polymer models. One of the most widely used elasticity models for DNA is the twistable worm-like chain (TWLC), which describes the double helix as a continuous elastic rod with bending and torsional stiffness. An extension of the TWLC, which has recently received s...

Arm stiffness is a critical factor underlying stable interactions with the environment. When the hand moves freely through space, a stiff limb would most effectively maintain the hand on the desired path in the face of external perturbations. Conversely, when constrained by a rigid surface, a compliant limb would allow the surface to guide the hand while minimizing variations in contact forces....

Harmonic force and torque, which are caused by rotor imbalance and sensor runout, are the dominant disturbances in active magnetic bearing (AMB) systems. To eliminate the harmonic force and torque, a novel control method based on repetitive control and notch filters is proposed. Firstly, the dynamics of a four radial degrees of freedom AMB system is described, and the AMB model can be described...

A homogenization sampling procedure is introduced which allows computation of effective trabecular bone stiffness and individual trabecula level stress based on precise models of trabecular bone architecture. Three-dimensional digitized images of 53 trabecular bone specimens with a resolution of 50 microns per voxel were directly converted into three-dimensional finite element meshes by making ...

Following the withdrawal of the filtering track from the latest TREC conferences, there is a niche for new evaluation standards. Towards this end, we suggest, based on variations of TREC’s routing subtask, two new evaluation methodologies. The first can be used for evaluating single, multi-topic profiles and the second for testing the ability of a multi-topic profile to adapt to both modest var...

In this investigation, a pneumatic suspension model with orifice damping is developed and used to evaluate the performance of air in comparison coil-spring railroad highway transportation systems. railcars, springs are isolate car from vibrations caused by track irregularities, while trucks, often their rear suspensions allow adjusting characteristics depending on load conditions. The spring fo...