Mechanical Engineering and Design
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Open Access journal
ISSN (Print) 2327-0543 - ISSN (Online) 2327-0624
Published by Ivy Publisher [25 journals]
- The Design of a Vertical-travel Electromagnetically Controlled Focal Plane
Shutter, and the Study of the Shutter’s Test Method
Abstract: The Design of a Vertical-travel Electromagnetically Controlled Focal Plane Shutter, and the Study of the Shutter’s Test Method
Author Lei Zha
Due to the limitations of the optical systems certain type of high-altitude plane array aerial camera, a suitable narrow space, high-frequency, large format shutter has been needed. The ordinary focal plane shutter which was widely used by aerial camera is unable to meet the requirements. For this purpose, the design of a vertical-travel electromagnetically controlled focal plane shutter, and the study of the shutter prosecutors makes the fine adjustment of the shutter moving parts of the shutter of the camera requirements. The shutter has small size, high frequency and large format, which has broad application prospects in the fields of aerial camera.
- The Effect of Creep on Stress and Strain Fields nearby Crack Tip
Abstract: The Effect of Creep on Stress and Strain Fields nearby Crack Tip
Author Fuqiang YangHe Xu
Stress and strain nearby crack tip are key factors in quantitatively predicting the growth rate of stress corrosion cracking (SCC). Metals will creep in high temperature water environments, which will lead to the variation of stress and strain distribution nearby crack tip and affect the SCC growth rate. The effects of creep on the stress and strain fields nearby crack tip are studied with one inch compact tension (1T-CT) specimen by finite element method in this paper. The results indicate that the stress nearby crack tip reduces dramatically because of the action of creep, but the variation of strain and plastic zone nearby the crack tip are insignificant.
- Research on Workflow Management Model in PDM System of Tunnel Drilling
Rigs in Coal Mine
Abstract: Research on Workflow Management Model in PDM System of Tunnel Drilling Rigs in Coal Mine
Author Guiqin Li
To improve the operation efficiency of workflow of tunnel drilling rig design, it introduce the workflow management model and the definition of workflow, and according to the characteristics of the workflow in the design of tunnel drilling rigs, built the design process and the drawing change process of tunnel drilling rig in the PDM system, realize the workflow management in the development of tunnel drilling rig.
- Statics Analysis and Fatigue Analysis on Double Telescopic Column of
Abstract: Statics Analysis and Fatigue Analysis on Double Telescopic Column of Hydraulic Support
Author Youjin GaoTingsheng Zha
The statics analysis and fatigue analysis on double telescopic columns are studied in this paper. First, based on the actual mechanical conditions, which the column are subjected, the mechanical calculation model is established. The reasonable assumptions of the load and boundary conditions for the model are proposed. Considering the actual force and deformation state of the column, the revised deformation compatibility conditions for the longitudinal bending beam model are presented. For each column component, the deflection, angle, maximum bending moment and its position are calculated under two load conditions, respectively. Then, according to the fourth strength theory, the combined stress of each part are calculated. The numerical results show that the revised continuity boundary conditions reflect actual force and deformation state of the column better. Second, according to the fatigue test datum of the double telescopic column, the strain history is processed statistically to determine the working cycle by the rain flow counting algorithm. Based on the linear cumulative fatigue damage theory and the assumption of equivalent damage, fatigue life of each column component is estimated.