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振动声学技术利用锤击法在螺栓疲劳开裂检测方法研究
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作者 贾永刚 《中国科技期刊数据库 工业A》 2024年第3期0075-0079,共5页
工程应用对结构可靠性的迫切需求使螺栓连接的健康监测成为焦点。本研究针对M30×200 mm螺栓,提出并验证了一种基于振动声学技术的裂纹缺陷检测方法。结合锤击试验、模态仿真及理论推导,实验数据揭示该方法可准确识别至少2 mm的裂... 工程应用对结构可靠性的迫切需求使螺栓连接的健康监测成为焦点。本研究针对M30×200 mm螺栓,提出并验证了一种基于振动声学技术的裂纹缺陷检测方法。结合锤击试验、模态仿真及理论推导,实验数据揭示该方法可准确识别至少2 mm的裂纹深度。振动声学不仅能定位裂纹,还能估其深度,特别是螺栓的1/2和1/4位置。考虑到工程中螺栓的疲劳断裂,该方法具备显著的实际应用潜力。本研究亦融合模态仿真与机器学习,为螺栓损伤的智能检测开辟新方向。 展开更多
关键词 振动声学技术 螺栓裂纹缺陷 锤击试验 模态仿真模拟 理论推导 疲劳断裂 机器学习。
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A Quasi-steady-state Model for Numerical Simulation of Batch Extractive Distillation 被引量:2
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作者 方静 李春利 +1 位作者 王洪海 孙立军 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第1期43-47,共5页
Batch extractive distillation(BED)is a special method used in the distillation process by adding a solvent into the batch distillation column to alter the relative volatility of the components and improve the separati... Batch extractive distillation(BED)is a special method used in the distillation process by adding a solvent into the batch distillation column to alter the relative volatility of the components and improve the separation. A comprehensive design and simulation method is required due to the complexity of BED.In this study,a quasi-steady-state model for BED is proposed,the derivation and solution of the model are presented.This shortcut model can be used to simulate the composition and temperature of the reboiler,the top and other plates of the column in a batch extractive distillation operation.The calculated values are in good agreement with the experimental data.The results show that the quasi-steady-state model is a practical method because of some advantages such as high precision and fast calculation. 展开更多
关键词 batch distillation extractive distillation SIMULATION MODEL
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Control strategy for energy recovery system in hybrid forklift
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作者 龚俊 何清华 +3 位作者 张大庆 赵喻明 刘昌盛 唐中勇 《Journal of Central South University》 SCIE EI CAS 2014年第8期3119-3125,共7页
After analyzing the working condition of the conventional diesel forklift,an energy recovery system in hybrid forklift is considered and its simulation model is built.Then,the control strategy for the proposed energy ... After analyzing the working condition of the conventional diesel forklift,an energy recovery system in hybrid forklift is considered and its simulation model is built.Then,the control strategy for the proposed energy recovery system is discussed,which is validated and evaluated by simulation.The simulation results show that the proposed control strategy can achieve balance of the power and keep the state of charge(SOC) of ultra capacitor in a reasonable range,and the fuel consumption can be reduced by about 20.8% compared with the conventional diesel forklift.Finally,the feasibility of the simulation results is experimentally verified based on the lifting energy recovery system. 展开更多
关键词 hybrid power forklift truck energy recovery control strategy ultra capacitor
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Does defensive posture increase mimetic fidelity of caterpillars with eyespots to their putative snake models? 被引量:2
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作者 Thomas John HOSSIE Thomas N. SHERRATT 《Current Zoology》 SCIE CAS CSCD 2014年第1期76-89,共14页
Organisms often evolve behaviours that increase or reinforce the protection from predators afforded by their morpho- logical defences. For example, mimetic animals may adopt postures or locomotory behaviours that emul... Organisms often evolve behaviours that increase or reinforce the protection from predators afforded by their morpho- logical defences. For example, mimetic animals may adopt postures or locomotory behaviours that emulate a characteristic fea- ture of their model to increase predator deception. Caterpillars with eyespots are thought to mimic snakes, and when threatened many of these caterpillars adopt a posture that appears to enhance this resemblance. Herein we evaluate the quantitative strength of evidence of behavioural mimicry in the caterpillars of 14 species by comparing how closely a series of putative snake-mimicking caterpillars resemble snakes while at rest and when threatened. Specifically, we quantified the head morphology and eye position of a range of snake species, as well as the shape of the apparent head (i.e. anterior body segments) and position of eyespots in caterpillars resting or in their defensive posture. This allowed us to objectively examine evidence for an increased resemblance to either snakes generally, or to Viperidae snakes specifically, upon adopting the defensive posture. Widening the anterior body segments during the defensive posture typically made caterpillars appear more viper-like as opposed to more snake-like in general. Enhanced resemblance to vipers upon mounting the defensive posture was apparent only from the dorsal view. Laterally, caterpillars more closely resembled snakes in the resting posture and shifting to the defensive posture instead reduced mimetic fidelity, Overall we found evidence for behavioural mimicry in all 14 species examined. We highlight that objectively quantifying mimetic fidelity can help identify key features involved in deception . 展开更多
关键词 Behaviour Geometr!c morphometrics Protective colouration MIMICRY Morphology Vipers
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Rigid-Flex Coupling Modeling and Simulation on Multistage Gear Transmission System
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作者 周杰 贾云献 +2 位作者 刘鑫 方彬 侠文强 《Journal of Shanghai Jiaotong university(Science)》 EI 2016年第4期457-461,共5页
As multistage gear transmission systems are complex and precise, the flexibility of shaft can influence the dynamic response of system. In order to study dynamic response of the system, we build the rigid model of gea... As multistage gear transmission systems are complex and precise, the flexibility of shaft can influence the dynamic response of system. In order to study dynamic response of the system, we build the rigid model of gear system and the finite element model of the gear shaft. virtual prototype technology, and a contrast between rigid The rigid-flex coupling model is established with the model and rigid-flex coupling model is constructed. With these methods, the dynamic responses with different rotation speeds and different loading magnitudes are examined. We also analyze the influence of shaft flexibility, rotation speeds and loading magnitudes on the vibration characteristics of gear transmission systems. 展开更多
关键词 gear transmission system virtual prototype flexible body
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