During the multistage fracturing of shale gas horizontal wells, casing damage frequently occurs, making it essential to evaluate stress and deformation. This paper establishes a mathematical model thermo-hydro-mechanical coupling finite element casing-cement sheath-formation (CCF). examines effects temperature, thickness, nonuniform in situ stress, mechanical properties cement sheath, treating ...

A three-dimensional motion capture system is a useful tool for analysing gait patterns during walking or exercising, and it frequently applied in biomechanical studies. However, most of them are expensive. This study designs low-cost detection with high accuracy reliability that an alternative method/equipment the field to widely used commercial system, virtual user concept (Vicon) system. The ...

dxl of calcaneus is a portable method for bmd. this study determined a cut off point for dxl in osteoporosis diagnosis. in 510 healthy postmenopausal women, bmd of axial regions with dxa (dpx-md, ge,lunar corp, madison, wi) and heel with dxl (demeteck- sweden), measured. the agreement of two methods and cut off point for dxl in defining osteoporosis, obtained. dxa found osteoporosis in 34.3% an...

The under-actuated foot rotation that the heel of the stance leg lifts off the ground and the body rotates around the stance toe is an important feature in human walking. However, it is absent in the realized walking gait for the majority of biped robots because of the difficulty and complexity in the control it brings about. In this paper, a hybrid control approach aiming to integrate the main...

Abstract Made a pioneering attempt to use the lattice sandwich structure in prosthetic foot design and pioneered study for lay-up of foot. An innovative carbon fiber bionic was designed using structure. The effect cross-ply on foot’s energy storage properties vibration characteristics investigated finite element model constructed under normal working conditions according international standards...

Gait detection technology is widely used in medical and military fields. The key of gait low cost, high accuracy portable equipment real-time algorithm. This paper introduces a system, this kind system using machine learning algorithm based on FCM clustering analysis calibration the sensor data filter rules, kinematic divided into five different events, namely heel strike , foot flat, off toe i...

Although the movement of the leg during swing phase is often compared to the unforced motion of a compound pendulum, the muscles of the leg are active during swing and presumably influence its motion. To examine the roles of muscles in determining swing phase knee flexion, we developed a muscle-actuated forward dynamic simulation of the swing phase of normal gait. Joint angles and angular veloc...

PURPOSE The aim of this study was to compare the biomechanical changes during natural heel-toe running with learned midfoot and Pose running. METHODS Twenty heel-toe runners were instructed in midfoot running and a novel running style in which the acromium, greater trochanter, and lateral malleolus are aligned in stance (Pose running). Clinical gait analysis was performed for each running sty...

The replacement of force sensitive resistors (FSRs) with a single vibratory gyroscope has been examined for use within a drop foot correction system. The sensor is small and lightweight enough to be easily attached to the shoe, and may be used (currently with an IBM compatible PC) to detect four gait events: heel contact, foot flat, heel rise and toe off. The cost of the gyroscopic sensor is co...

Wide variety of timings and techniques has been used based on the housing, production, availability of requirements etc. This current study was done for a morphologic evaluation of the cow's digit in different trimming times. A dairy herd with 2200 milking cow, free stalls barns, average daily production of 36 liters per cow was selected. Forty cows were assigned to four groups based on hoof tr...