Objectives: Altered movement strategy and postural control has been observed in Low Back Pain (LBP) patients. Objective of this study was to determine postural response following support surface translation, also correlations between postural response related measures and disability caused by LBP. Methods: 20 healthy subjects and 20 patients with recurrent non specific LBP participated in th...

A real-time dynamic displacement estimation technique is developed by data fusion of laser Doppler vibrometer (LDV) and light dectection and ranging (LiDAR). The velocity measurement of LDV is low level of noise and sampled at high frequency, but has accumulated error during integration. Also, the LiDAR displacement measurement has high level of noise and low sampling frequency. The proposed te...

in this paper, multi-objective uniform-diversity genetic algorithm (muga) with a diversity preserving mechanism called the ε-elimination algorithm is used for pareto optimization of 5-degree of freedom vehicle vibration model considering the five conflicting functions simultaneously. the important conflicting objective functions that have been considered in this work are, namely, vertical accel...

during the past decades, attempts have been made to develop an early warning system for coming destructive earthquakes a few seconds before the ongoing ground motion. in this paper, a practical method for the early warning of earthquakes in south iran is presented. this region is selected for study because it has high potential for generating earthquakes and has a more complete strong ground mo...

This paper introduces an optical measurement system for shock wave characteristics. The system works by mountinga metal plate attached to spring mounts against the shock wavefront. This set is sealed and can plot the shock wave pressure diagram by measuring plate's displacement, radiation and changing the reflection of light during shock wave conflict, and converting these optical data to volta...

Accelerating displacements preceding some catastrophic landslides has been found empirically to follow a time-to-failure power law, corresponding to a finite-time singularity of the velocity v ∼ 1/(tc − t) [Voight, 1988]. Here, we provide a physical basis for this phenomenological law based on a slider-block model using a state and velocity dependent friction law established in the laboratory a...

A method is given by which the response of a rotating or non-rotating Timoshenko beam can be determined, subjected to an accelerating fixed direction distributed surface force. The beam mode1 includes the gyroscopically induced displacement transverse to the direction of the load. The solution for pinned supports is set up using multi-integral transforms, and the inversion is expressed in terms...