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Investigation of the Influence of Pitch/Lag on Helicopter AirResonance Stability

Xue Haifeng,Xiang Jinwu,Zhang Xiaogu,Li Shuqiang

Strategic Study of CAE 2007, Volume 9, Issue 9, Pages 58-62

Abstract:

The influence of pitch/lag coupling on helicopter air resonance is investigated First, helicopter air resonance equations of motion considering pitch/lag coupling is derivedair resonance through the eigenvalue of the system.air resonance considering pitch/lag coupling are explicated. The results indicated that the positive pitch/lag coupling can restrain the instability of helicopter

Keywords： helicopter dynamics instability helicopter air resonance pitch/lag coupling

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Damage Tolerance Approach in Life Management of Helicopter Dynamic Components

Liu Wenlin,Mu Zhitao, Duan Chengmei

Strategic Study of CAE 2005, Volume 7, Issue 2, Pages 76-80

Abstract:

Several life management methods of helicopter dynamic components were discussed, such as safe-lifeaspects, which can make the damage tolerance approach very difficult to apply in practice to every helicopterSeveral key technical settlements when damage tolerance method was put in practice in life management of helicopter

Keywords： helicopter damage tolerance life management nondestructive inspection

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Future Development of Helicopter and Transport Aircraft in China

Zhang Yanzhong

Strategic Study of CAE 2002, Volume 4, Issue 8, Pages 1-7

Abstract:

The actual state, future development principle and plan of china*s helicopter and transport aircraftThe helicopter in production such asZ-11, Z-9, Z-8, and the transport aircraft in production such asThe development principle of three generations is put forward, i.e. to improve Z - 11, Z - 9, Z - 8 helicopter, develop 6-ton class helicopter, research 10-ton class helicopter, and to improve Y - 8, Y - 12, developThe key technological plan for helicopter’s composite materials, rotor system, transmission system

Keywords： China helicopter transport aircraft development

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Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

Frontiers of Structural and Civil Engineering Pages 981-993 doi: 10.1007/s11709-023-0979-5

Abstract: of a linear elastic simple Euler–Bernoulli beam, and investigated the forced modal oscillation and resonanceThe analysis revealed that a moving load induces high-harmonic forced resonance amplification when theTo verify the occurrence of high-harmonic forced resonance, numerical tests were conducted on single-spanThe forced resonance amplification characteristics of the fundamental mode for beam response estimationThe results reveal that the high-harmonic forced resonance may be significant for the investigated beams

Keywords： forced vibration linear Euler beam moving load harmonic structure frequency modulation end restraints

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The Development of Civil Helicopter in China

Jiang Xintong

Strategic Study of CAE 2000, Volume 2, Issue 7, Pages 10-15

Abstract:

This paper discusses the strategy significance and urgency of the development of civil helicopteron the basis of the present development of helicopter in the world, and especially in connection withOwing to its high tech content and unique flight ability, helicopter is playing a more and more importantthe civil helicopter industry on the existing foundation.The policy suggestion is also put forward on the development of the civil helicopter for the future.

Keywords： helicopter high tech industry economic increase point development plan policy suggestion

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Sectional model test study on vortex-excited resonance of vehicle-bridge system of Shanghai Bridge over

Li ZHOU, Yaojun GE

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 1, Pages 67-72 doi: 10.1007/s11709-009-0007-4

Abstract: It is necessary to study how vehicles influence the vortex-excited resonance of vehicle-bridge systems, because lock-in wind speed is low and vortex-excited resonance is sensitive to any change in the mainBased on the Shanghai Bridge over the Yangtse River, the vortex-excited resonance of a 1∶60 scale sectionalThe result indicates that: 1) for the bridge with vehicles, the vertical vortex-excited resonance isTherefore, the influence of vehicles on vortex-excited resonance performance of vehicle-bridge systems

Keywords： vehicle-bridge system sectional mode vortex-excited resonance wind tunnel test mode shape correction

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Discovery of the mechanisms of acupuncture in the treatment of migraine based on functional magnetic resonance

Frontiers of Medicine Pages 993-1005 doi: 10.1007/s11684-023-0989-7

Abstract: The functional magnetic resonance imaging (fMRI) data were analyzed for investigating brain changes induced

Keywords： acupuncture migraine fMRI metabolome proteome

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Extended stochastic resonance (SR) and its applications in weak mechanical signal processing

Niaoqing HU, Min CHEN, Guojun QIN, Lurui XIA, Zhongyin PAN, Zhanhui FENG,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 450-461 doi: 10.1007/s11465-009-0072-3

Abstract: This paper presents a method based on stochastic resonance (SR) to detect weak fault signal.

Keywords： extended stochastic resonance (SR) stability analysis of SR scale transform weak signal detection incipient

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Mars Helicopter Exceeds Expectations

Mitch Leslie

Engineering 2021, Volume 7, Issue 11, Pages 1511-1512 doi: 10.1016/j.eng.2021.09.003

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Design of hydraulic resonance of pulsed water - jet

Pu Jianing,Chen Ming

Strategic Study of CAE 2009, Volume 11, Issue 2, Pages 36-42

Abstract:

By setting a sinusoidal pulsed flow generator and an air chamber at theconduit respectively , and elaborately structuring conditions of water jet system , a strong hydraulic resonanceThe conditions of desirable resonance are searched by direct search algorithm of Matlab .

Keywords： pulsed water- jet hydraulic resonance method of characteristics variable time step method Matlab

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Modeling and analysis of landing collision dynamics for a shipborne helicopter

Dingxuan ZHAO, Haojie YANG, Carbone GIUSEPPE, Wenhang LI, Tao NI, Shuangji YAO

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1, Pages 151-162 doi: 10.1007/s11465-020-0617-z

Abstract: model is established based on small-angle approximation to improve the simulation model for shipborne helicopterResults show that the proposed dynamic model can simulate the collision motion of helicopter landingSeveral suggestions for helicopter pilot landing are likewise provided.

Keywords： shipborne helicopter landing model Lagrange equations dynamics validation

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Intercontinental transport of air pollution

Lin ZHANG,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 1, Pages 20-29 doi: 10.1007/s11783-010-0014-7

Abstract: There is an increasing interest on the intercontinental transport of air pollution among the three mainAir pollutants with sufficient long lifetime can be transported from one continent to another.from ground sites, aircraft and satellites have demonstrated this intercontinental-scale transport of airmodeling studies of intercontinental transport of ozone and its precursors, and the resulting impacts on air

Keywords： intercontinental transport ozone air pollution

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Health impacts of air pollution in China

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 4, doi: 10.1007/s11783-020-1367-1

Abstract:

•Impacts of air pollution on various body systems health in China were

Keywords： Health impacts Air pollution China Advances

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Machine learning for detecting mesial temporal lobe epilepsy by structural and functional neuroimaging

Baiwan Zhou, Dongmei An, Fenglai Xiao, Running Niu, Wenbin Li, Wei Li, Xin Tong, Graham J Kemp, Dong Zhou, Qiyong Gong, Du Lei

Frontiers of Medicine 2020, Volume 14, Issue 5, Pages 630-641 doi: 10.1007/s11684-019-0718-4

Abstract: Mesial temporal lobe epilepsy (mTLE), the most common type of focal epilepsy, is associated with functional and structural brain alterations. Machine learning (ML) techniques have been successfully used in discriminating mTLE from healthy controls. However, either functional or structural neuroimaging data are mostly used separately as input, and the opportunity to combine both has not been exploited yet. We conducted a multimodal ML study based on functional and structural neuroimaging measures. We enrolled 37 patients with left mTLE, 37 patients with right mTLE, and 74 healthy controls and trained a support vector ML model to distinguish them by using each measure and the combinations of the measures. For each single measure, we obtained a mean accuracy of 74% and 69% for discriminating left mTLE and right mTLE from controls, respectively, and 64% when all patients were combined. We achieved an accuracy of 78% by integrating functional data and 79% by integrating structural data for left mTLE, and the highest accuracy of 84% was obtained when all functional and structural measures were combined. These findings suggest that combining multimodal measures within a single model is a promising direction for improving the classification of individual patients with mTLE.

Keywords： mesial temporal lobe epilepsy functional magnetic resonance imaging structural magnetic resonance imaging

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Experimental investigation on desiccant air-conditioning system in India

Vijay MITTAL, B. Kant KHAN,

Frontiers in Energy 2010, Volume 4, Issue 2, Pages 161-165 doi: 10.1007/s11708-009-0070-5

Abstract: in a room with a volume of 86.4 m, air ducts and a blower.The experiment was made in such a way that the percentages of return air, outdoor air and indoor airmixed with the air leaving the desiccant and desiccant bed thickness could be adjusted.The optimum percentages of air ratios were as follows: 10% of outdoor air, 10% of return air (mixed togetherat the desiccant bed inlet) and 80% of indoor air mixed with the dry air leaving the desiccant.

Keywords： air ratios ambient conditions desiccant air-conditioning silica gel