In order to study the stress characteristics of initial support and secondary lining large section tunnel solve problem cracking during operation. Taking in Zihong village, Qi County as research object, a numerical simulation method was used establish finite element model tunnel. So simulate analyze structure this Through second terms displacement, stress, plastic zone damage anchor shaft force...

A 29 year old woman, known to be eight weeks pregnant, presented to the accident and emergency department having twisted and fallen onto her left leg while playing netball. The limb was painful and she was unable to weight bear. On examination there was no deformity or swelling but the entire leg was painful and the patient was unable to locate an area ofmaximal tenderness. There was no neurova...

The reliability of any mechanical system, in which the linear displacement of a piston is converted into the rotation of a power transmission shaft, strongly depends on the reliability of the crankshaft. The crankshaft is the critical component and any damage occurring to the crankshaft may put the mechanical system out of order. The numerical finite element simulation of crankshafts with multi...

Turbo generator shafts are often subjected to cyclic torsion resulting in formation of large longitudinal cracks as well as circumferential cracks. The presence of these cracks could greatly impact the shaft resonance frequencies. In this paper, dynamic response of a shaft with longitudinal and circumferential cracks is investigated through a comprehensive analytical study. The longitudinally c...

The theoretical performance of some flammable refrigerants, namely, propane (HC290), butane (HC600), isobutane (HC600a), cyclopropane (HCC270), HFC152a and HCFC142b have been comparativelyassessed as alternatives to CFC12. Th~s has been done for a range of evaporating temperatures by using some standard refrigera~ion parameters like pressure ratio, ·specific compressor displacement, theoretical...

Previous experimental and numerical studies indicate that the stress state of sand at a specific depth changes significantly during installation displacement pile. At given level, horizontal in increases as end pile approaches reduces continues to penetrate go past element. This reversal, together with large-strain deformation shaft, may cause reduced accuracy calculation capacity. In this pape...

Piping vibration which is mainly caused by the torsional vibration of rotary compressor can be a major noise source of air-conditioner. Especially, the tangential vibration of rotary compressor which is due to the torsional vibration is much higher than the radial vibration or the vertical vibration of compressor. A study as to how the tangential vibration of rotary compressor is related with t...