The article presents an adaptation of a parametric diagnostic method based on the square amplitude gains model, which was tested in experimental studies bearing damage detection (outer race, inner balls damage). described is shaft displacement signal analysis, affected by vibrations coming from bearings. model’s parameters are determined processing time domain to frequency few steps. Firstly, r...

Rolling-element bearings are one of the most important elements when predicting noise rotating machinery. As a major connecting point between and non-rotating parts, their dynamic properties have to be accurately known. In this investigation we present bottom-up approach characterising dynamics rolling-element bearing. A special test device was designed built assess quality well-established ana...

The connection method of lengthening the steel tube hollow concrete-filled sandwich circular tubes and threaded connections is proposed. length, depth position are basic parameters. Twelve concrete pipes with were designed subjected to axial compression tests. compressive loading–longitudinal displacement curves, loading strain curves failure mode specimens analyzed, effects different parameter...

Abstract Overconstrained mechanism has the advantages of large bearing capacity and high motion reliability, but its force analysis is complex difficult because system contains overconstraints. Considering limb axial deformation, taking typical 2SS+P 7-SS passive overconstrained mechanisms, 2SPS+P 7-SPS active passive-input mechanisms as examples, a new method based on idea equivalent stiffness...

Magnetic levitation is a technique to suspend an object without any support other than that of a magnetic field. The technique finds application in various fields where friction or abrasion between metallic surfaces (like bearings) or products of friction are detrimental to the environment or to the rubbing surfaces themselves. In a simple configuration, an electromagnet is used to lift up a fe...

A majority of proximal humeral fractures are preferably treated conservatively. However, surgical management may be beneficial in proximal humeral fractures with significant displacement or angulation. Unfortunately, the complication rates associated with current surgical procedures for fracture fixation, ORIF and IM devices, can be unacceptably high. A new technology, termed the PH Cage, addre...

Abnormal patellofemoral joint motion is a possible cause of patellofemoral pain, and patellar braces are thought to alleviate pain by restoring normal joint kinematics. We evaluated whether females with patellofemoral pain exhibit abnormal patellofemoral joint kinematics during dynamic, weight-bearing knee extension and assessed the effects of knee braces on patellofemoral motion. Real-time mag...

lateral and anterior displacements of mandible may cause malocclusion. the aim of this study was to determine the prevalence of these displacements in a population of 597 childrens age 12 in mashhad secondary schools. displacment of mandible was shown to be in 11.8 percent of the population (6.2 percent anterior and 5.6 percent lateral displacement).anterior displacement of mandible was diagnos...

In this paper, an intelligent controller to control a smart base-isolated masonry structure is proposed. The smart base isolation consists of rubber bearings and a magnetorheological damper. This semi-active scheme takes advantage of the low power requirement of magnetorheological devices to achieve structural control. The controller is capable of mapping the behaviour of the controlled structu...

BACKGROUND In this pilot study we wanted to evaluate the kinematics of a knee implanted with an artificial polycarbonate-urethane meniscus device, designed for medial meniscus replacement. The static kinematic behavior of the implant was compared to the natural medial meniscus of the non-operated knee. A second goal was to evaluate the motion pattern, the radial displacement and the deformation...