Operation Of Shaft Research Articles

Guest Editorial

Guest Editorial

The Research on Turning Operation of Varied Diameter Slender Shaft

By analysing the processing characteristics of varied diameter slender shaft parts, and according to the basic vibration theory of slender shaft, a production machine is designed,moreover, a solution with flexible hydraulic follower rest and elastic tailstock is adopted creatively. Experimental results show that this machine tools can effectively improve radial dimensional accuracy,surface quality and production efficiency of the varied diameter slender shaft parts and it has a wide range of engineering significance.

Hybrid intelligent control for optimal operation of shaft furnace roasting process

A hybrid intelligent control method is proposed to control the technical indices into their desired range. This is realized by on-line adjusting the set-points of control loops for optimal operation of the shaft furnace in response to changes in operating points. The controller consists of six modules, namely a pre-setting model for control loop set-points, a predictive model for technical index, a feedforward compensator using predictive model, a feedback compensator, a fault working situation diagnosis and a fault tolerant control model. The proposed approach has been successfully applied to the roasting process of shaft furnace in a mineral processing plant in China and its efficiency has been verified by the practical application results.

Error Compensation in Turning Operation of Slender Shaft Using a Fuzzy PID Controller

Turning operation of slender shaft poses a great challenge in machining field. It is due to the fact that the accuracy of machined workpiece depends almost completely on the operator’s skill by using conventional methods. To improve the accuracy of slender shaft with less operation skill, this paper presents an error compensation system, which includes a fuzzy PID controller. As a part of the controller, the traditional PID controller is used to control a follower rest for improving the dimensional accuracy. And the fuzzy controller incorporates skilled operators’ knowledge into an automatic machining system. At the end, turning experiments are carried out to verify the efficacy of the error compensation system. The experimental results indicate that the dimensional accuracy of slender shaft using the system is higher and more stable than that by using conventional methods.

Reactive power sharing in ship energy systems with shaft generators

This paper deals with the well-based mathematical formulation of active and reactive load sharing of the synchronised generators of a ship’s electric energy system. Thus, both the first- and second-stage regulation during load sharing is presented via mathematical equations. The novelty introduced in the paper is, on the one hand, that the hybrid parallel operation of shaft and conventional generators is covered, while on the other hand, that the analysis results in solving the combined reactive and real load sharing within the generator rated capacity. Furthermore, the dynamic behaviour of the machines and their controllers during the load sharing problem is also discussed with the aid of simulations in the MATLAB/Simulink environment. The entire analysis, which it is hoped can also be used for educational purposes, is enriched by figurative results obtained from an actual ship case study, in which this work assisted in resolving a series of load sharing problems

Treatment of femoral shaft comminuted fractures with interlocking intramedullary nail

目的 探讨使用交锁髓内钉治疗股骨干粉碎性骨折的手术方式选择、疗效.方法对1998年1月～2002年10月使用交锁髓内钉治疗67例(76肢)股骨干粉碎性骨折的疗效进行回顾性分析.手术采用闭合、小切口或有限切开复位,用三维瞄准器锁定骨折远近端.结果平均随访14.1个月,肢体、关节功能恢复优良率92.5%(62/67),一期骨折愈合率90.8%(69/76).平均骨临床愈合时间6.7个月.2例软组织感染,感染率2.6%,2例髓内钉断裂.结论交锁髓内钉治疗股骨干粉碎性骨折应常规静力固定,不剥离或少剥离骨膜,不强求解剖复位,尽量闭合复位、有限扩髓,是目前治疗股骨干粉碎性或多节段骨折的有效方法。