As a kind of complicated mechanical automation, most of key parts of breech mechanism are cams delivering forces and movements by parts’ outline and figure. The major fault mode of breech mechanism is grain abrasion caused by dry sliding friction. There are no feasible and practical technologies to simulate and predict the abrasion failure lives of key parts for breech mechanism. A new simulation and prediction method is firstly put forward in this paper. Based on Pro/E and ADAMS, the virtual prototype of breech mechanism of semiautomatic vertical sliding-wedge type is established. Key parts’ load spectrum can be obtained based on virtual prototype. Pin-on-disc friction and abrasion testing machine is designed and adopted to obtain typical materials’ abrasion rules. Finial simulation and prediction results are given as abrasion thresholds and operating items, which provide sufficient references for breech mechanism’s design and safeguard.
Torsion shaft is the important buffer and damping component of Self-Propelled Gun. Its main failure mode is fatigue fracture. In order to forecast the fatigue life of torsion shaft under stochastic loads, virtual prototyping of Self-Propelled Gun is established in Pro/E and ADAMS. A new kind of measurement method of load spectrums combining actual equipment experiment with virtual prototyping is firstly put forward in this paper and provides complete and accurate load spectrums of torsion shaft. Stress and strain spectrums can be obtained based on material’s S-N curve. The fatigue life of torsion shaft can be forecasted, which provide adequate reference for the maintenance cycle confirmation and mission reliability forecast.
Breech mechanism is the key and important device to improve reliability and maintenance for large caliber guns. It’s major fault mode is grain abrasion caused by dry sliding friction. There is no feasible and practical technologies to simulate and predict the abrasion failure life of key parts for breech mechanism. A new simulation and prediction method is firstly put forward in this paper. Based on Pro/E and ADAMS, the virtual prototype of breech mechanism of semiautomatic vertical sliding-wedge type is established. To validate its precision and effectivity, qualitative and quantitative verification method are adopted to check the virtual prototype of breech mechanism. Virtual prototype produces key parts’ load spectrums and failure theresholds. Dry sliding friction and abrasion experiment provides abrasion rules of typical materials. Finial simulation and prediction results are given as abrasion thresholds and operating items, which provide sufficient references for breech mechanism’s maintenance and safeguard.
Nautilus vertical axis wind turbine is a new breed which is being designed and developed through bionics and geometry, this kind of wind turbine is not only novel in appearance, and stable in structure, but also has excellent aerodynamic performance. Based on this type of wind turbine, combined with its structural characteristics, this paper designed 20 prototypes by continuously adjusting the structural parameters of the spiral blades. The performance of these prototypes is compared by simulation, the optimal structure of this kind of wind turbine is selected. This optimized wind turbine has a strong ability to collect wind energy and can obtain higher wind energy utilization in a wider range of wind speed, the maximum wind energy utilization rate reaches 32.842%. Then the wake characteristics are analysed, the reasonable arrangement is designed. This paper also built an equal scale reduced version of the real object using a 3D printer, and assembles it with a small disc type electric machine to construct a vertical axis wind power generation apparatus. Finally, experiments are conducted in a real environment to analyse the rotational speed and voltage waveform of this apparatus under different operating conditions experimentally.
KEYWORDS3D printing, blade optimization design, small disc type electric machine, vertical axis wind turbine, wake characteristics 1This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.