Dimensional accuracy in machined parts depends on the precision of spindle, which is highly affected by applied forces, itself. This precision of spindle becomes more serious when it is used for a period of long times. Therefore, stress and strain analysis of spindle is very important in the behavior and preservation of its precision. In this paper, the forces applied to the spindle of a turnin...

Abstract The spindle runout of unit 2 in a hydropower plant seriously exceeded the standard during startup test, and its main frequency was consistent with conversion frequency, which did not meet test acceptance specification. Through analysis variable speed data unit, it is judged that reason for excessive mass imbalance generator rotor, affects vibration shafting frame. A dynamic balance met...

The brake disc spindle of the electromechanical braking system will be accompanied by vibration unbalanced fault during rotation operation, which affect performance system. In view this phenomenon, based on ensemble empirical mode decomposition algorithm and related energy operation theory, an offline purification program for axial trajectory are designed. Meanwhile, online control feedback pro...

abstract gastrointestinal mesenchymal tumors are a group of tumors originating from the mesenchymal stem cells of the gi tract. digestive tract schwannomas are rare mesenchymal tumors which occur most frequently in the stomach. we report a 56-yearold woman who was examined endoscopically for dyspepsia which she had suffered from since 3 years ago. around gastric antral mass was seen. surgical r...

New forms of adjustable fluid film hydrodynamic bearings have shown great potential for suppressing vibrations and maintaining accuracy of location of rotational centres. First demonstrated on a simulated grinding wheel machine tool rotor and spindle system, the principal has also been applied to the support bearings in a large marine gearbox application. In both cases the bearing adjustment fe...

An indicator which is calculated after the data reduction of a test data set may be used to estimate the (systematic) instrument error at a macromolecular X-ray source. The numerical value of the indicator is the highest signal-to-noise [I/sigma(I)] value that the experimental setup can produce and its reciprocal is related to the lower limit of the merging R factor. In the context of this stud...

background: the aim of this study was to assess effects of cysteamine as an anti-oxidant on rate of in vitro maturation of oocyte and determination of its effects on spindle size and shape. methods: pre-mature mice were primed with pregnant mare stimulating gonadotrophin (pmsg) and germinal vesicle (gv) stage oocytes were obtained 48 h after. the oocytes were cultured in tissue culture medium (...

Thin-walled parts are commonly used in the aerospace sector. However, there serious machining challenges, such as deflection, deformation and vibration. The final thin-walled component will deteriorate dimensional accuracy surface quality. This is due to vibration that occurs during flexible milling of structures since workpiece rigidity lower than cutting forces cutter. gradual reduction thin-...

The rock-breaking efficiency of a drilling tool directly affects the production costs and progress foundation construction. It is essential to understand mechanism mechanical improve efficiency. In this study, dynamic simulation research was carried out on drill bit based LS-DYNA platform. Additionally, influence rotational speed spindle feed rate force in process obtained. vibration also analy...