BACKGROUND Footballers constitute a unique group of patients with tibial shaft fractures. They tend to have excellent general health and well developed musculature in the leg, and their fractures are generally closed injuries caused by low velocity trauma. However, little has been reported on the outcome after tibial shaft fractures in this group. OBJECTIVE To identify patterns of injury, res...

Minimally invasive plate osteosynthesis (MIPO) has been used for humeral shaft fractures, but concerns exist about soft tissue injuries. The purpose of this study was to report the surgical technique and clinical outcomes of MIPO using a helical plate for metadiaphyseal complex humeral shaft fractures. Twelve patients with acute displacement involving proximal and middle third humeral shaft fra...

Shaft angular acceleration is one of the most important parameter of rotary machines, the error of angular acceleration increased when the shaft speed up. For this problem, a new high accuracy angular acceleration measurement system is presented, the principle of measurement is self-regulating the period of speed sampling signal according to the proportion of the shaft speed up. This measuremen...

Introduction: A bifocal non-union of shaft of radius associated with ipsilateral non-union shaft of ulna in an adult has not been reported in the literature till date to the best of our knowledge, though few similar cases of fresh fractures have been reported. The case being reported by us is the first of its kind. Case Presentation: We report a case of bifocal non-union of shaft radius with no...

This paper investigates the on-line estimation of parameters and the determination of the significance of several nonlinear and time varying linear effects in rotor dynamic systems. These effects include nonlinear spring restoring forces, nonlinear structural damping, and the asymmetric stiffness of the shaft. Since these effects are all linear in the parameter, a linear regression scheme can b...

simultaneous fractures of the femoral neck and shaft are not common injuries, though they cannot be considered rare. herein, we report our experience with a patient with bilateral occurance of this injury. up to the best of our knowkedge this is the first case reported in literature in which correct diagnosis was made initially. both femurs were fixed using broad 4.5 mm dynamic compression plat...

Roller bearing is one of the most widely used and critical elements in rotating machinery. In consequence, bearing fault diagnosis in machines, as well as to discriminate the different fault conditions have been a great interest. In this study, firstly, analytical model of a shaft-ball bearing system is developed. The shaft is assumed to be perfectly rigid and uniform, and supported by two radi...

This paper examines ac motor shaft voltages and the resulting bearing currents when operated under pulse width modulation (PWM) voltage source inverters. The paper reviews the mechanical and electrical characteristics of the bearings and motor in relation to shaft voltages and bearing currents. A brief review of previous work is addressed, including the system model and experimental results. Th...

A fault diagnosis system based on LabVIEW is researched to analyze the rotating machinery fault. By developing data acquisition, signal analysis, processing and simulation, pattern recognition and fault diagnosis modules, this system can automatically measure and identify the shaft orbit of a rotor and get fault results. A pattern recognition method on the basis of the invariant moment algorith...

In this paper, the nonlinear vibration behavior of a rotor with asymmetric shaft considering misalignment is studied. The system consists of a rectangular shaft and a disk which is connected to a motor through a flexible coupling. In order to consider higher order deformations, nonlinear Bernoulli beam is used for modeling the shaft. Gibbons’ equations are utilized to apply misaligned coupling ...