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New nonlinear stiffness actuator with predefined torque‒deflection profile

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0721-3

Abstract: A nonlinear stiffness actuator (NSA) could achieve high torque/force resolution in low stiffness rangestructure were given by analyzing the weight of the NSA and the mechanic characteristic of the leaf springrollers were used in the cam-based mechanism, the sliding displacement between the cam and the leaf spring

Keywords： compliant actuator nonlinear stiffness actuator nonlinear spring predefined torque−deflection profile

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Pull-through capacity of bolted thin steel plate

Zhongwei ZHAO, Miao LIU, Haiqing LIU, Bing LIANG, Yongjing LI, Yuzhuo ZHANG

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5, Pages 1166-1179 doi: 10.1007/s11709-020-0641-4

Abstract: The loading capacity in the axial direction of a bolted thin steel plate was investigated. A refined numerical model of bolt was first constructed and then validated using existing experiment results. Parametrical analysis was performed to reveal the influences of geometric parameters, including the effective depth of the cap nut, the yield strength of the steel plate, the preload of the bolt, and shear force, on the ultimate loading capacity. Then, an analytical method was proposed to predict the ultimate load of the bolted thin steel plate. Results derived using the numerical and analytical methods were compared and the results indicated that the analytical method can accurately predict the pull-through capacity of bolted thin steel plates. The work reported in this paper can provide a simplified calculation method for the loading capacity in the axial direction of a bolt.

Keywords： bolted thin steel plate refined numerical model loading capacity nonlinear spring element analytical

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Analysis and characterization of wind-solar-constant torque spring hybridized model

Shantanu ACHARYA,Subhadeep BHATTACHARJEE

Frontiers in Energy 2014, Volume 8, Issue 3, Pages 279-289 doi: 10.1007/s11708-014-0312-z

Abstract: This paper presents a model of wind and solar thermal hybrid power plant with a spring storage systemturbine, solar energy is utilized by a Stirling engine, and the surplus energy is stored in a winding spring

Keywords： hybrid vertical axis wind turbine Stirling engine solar-thermal energy wind energy constant torque spring

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Back to the spring of Wuhan: facts and hope of COVID-19 outbreak

Guangbiao Zhou, Saijuan Chen, Zhu Chen

Frontiers of Medicine 2020, Volume 14, Issue 2, Pages 113-116 doi: 10.1007/s11684-020-0758-9

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Static balancing of planar articulated robots

Giuseppe QUAGLIA,Zhe YIN

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4, Pages 326-343 doi: 10.1007/s11465-015-0355-9

Abstract: aspects: One is the optimization for the position of the balancing system; the other is the design of the spring

Keywords： robotics static balancing pneumatic spring mechanical spring torque compensation

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A perspective of “Nuclear Hot Spring” for long-term sustainable economy of the world

Yingzhong LU

Frontiers in Energy 2011, Volume 5, Issue 4, Pages 349-357 doi: 10.1007/s11708-011-0168-4

Abstract: The proposed full-power natural circulation “Nuclear Hot Spring (NHS)” reactor could operate solely on

Keywords： natural safety reactor full power natural circulation sustainable world economy

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Spectral reflectance indices as proxies for yield potential and heat stress tolerance in spring wheat

Caiyun LIU, Francisco PINTO, C. Mariano COSSANI, Sivakumar SUKUMARAN, Matthew P. REYNOLDS

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 3, Pages 296-308 doi: 10.15302/J-FASE-2019269

Abstract: assessed the usefulness of 27 SRIs for indirect selection for agronomic traits by evaluating an elite spring

Keywords： genome-wide association study (GWAS) heat tolerance spectral reflectance spring wheat

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Host protection against Omicron BA.2.2 sublineages by prior vaccination in spring 2022 COVID-19 outbreak

Frontiers of Medicine 2023, Volume 17, Issue 3, Pages 562-575 doi: 10.1007/s11684-022-0977-3

Abstract: symptomatic patients without earlier infection histories during a SARS-CoV-2 outbreak in Shanghai in spring

Keywords： SARS-CoV-2 COVID-19 host response bronchoalveolar lavage fluid (BALF)

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Dynamic Simulation and Optimization of Rubber Suspension System of Articulated Dump Truck

Xu Zhihua,Sun Qinghong,Sun Beibei,Ma Zhu ,Li Suoyun ,Wang Huajun

Strategic Study of CAE 2005, Volume 7, Issue 9, Pages 34-39

Abstract:

Virtual prototyping technology has been used to analyze the dynamic characteristics of rubber springindicate that the good and constant ride comfort can be satisfied under different load because of the nonlinearThe results provide a basis for the parameter optimization of rubber spring suspension.

Keywords： articulated dump trucks suspension rubber spring dynamics nonlinear

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Comparative proteomic analysis of cold responsive proteins in two wheat cultivars with different tolerance to spring

Shujuan ZHANG,Guoqi SONG,Yulian LI,Jie GAO,Jiao WANG,Guiju CHEN,Haosheng LI,Genying LI,Zhendong ZHAO

Frontiers of Agricultural Science and Engineering 2014, Volume 1, Issue 1, Pages 37-45 doi: 10.15302/J-FASE-2014008

Abstract: Spring radiation frost (SRF) is a severe environmental stress which impairs wheat yield and productivity

Keywords： common wheat spring radiation frost proteomic analysis 2-DE MALDI-TOF-TOF MS

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Reliability Optimization Design for Coil Tube-spring

Zhang Yimin,He Xiangdong,Wen Bangchun

Strategic Study of CAE 2002, Volume 4, Issue 5, Pages 71-74

Abstract: to present the practical and effective method for the reliability optimization design for coil tube-springrespective program can be used to obtain the reliability optimization design information of coil tube-spring

Keywords： coil tube-spring reliability optimization design second moment method

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Reliability Sensitivity Design of Vehicle Familiar Spring

Zhang Yimin,Liu Qiaolingi,Wen Bangchun

Strategic Study of CAE 2004, Volume 6, Issue 1, Pages 74-80

Abstract: reliability design theory and sensitivity analysis method, the reliability sensitivity of the familiar springreliability sensitivity are obtained and the effects of design parameters on reliability of the familiar springpresented in this paper provides the theoretic basis for the reliability design of the vehicle familiar spring

Keywords： vehicle familiar spring reliability design sensitivity arbitrary distribution parameters

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Analysis of the dynamic hysteresis characteristic of finger seal

LEI Yanni, CHEN Guoding

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1, Pages 32-36 doi: 10.1007/s11465-007-0005-y

Abstract: A mass spring damper dynamics model of FS system was proposed and the hysteresis characteristic of the

Keywords： FS necessary hysteresis characteristic optimization spring

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Mean wind load induced incompatibility in nonlinear aeroelastic simulations of bridge spans

Zhitian ZHANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3, Pages 605-617 doi: 10.1007/s11709-018-0499-x

Abstract: Mean wind response induced incompatibility and nonlinearity in bridge aerodynamics is discussed, where the mean wind and aeroelastic loads are applied simultaneously in time domain. A kind of incompatibility is found during the simultaneous simulation of the mean wind and aeroelastic loads, which leads to incorrect mean wind structural responses. It is found that the mathematic expectations (or limiting characteristics) of the aeroelastic models are fundamental to this kind of incompatibility. In this paper, two aeroelastic models are presented and discussed, one of indicial-function-denoted (IF-denoted) and another of rational-function-denoted (RF-denoted). It is shown that, in cases of low wind speeds, the IF-denoted model reflects correctly the mean wind load properties, and results in correct mean structural responses; in contrast, the RF-denoted model leads to incorrect mean responses due to its nonphysical mean properties. At very high wind speeds, however, even the IF-denoted model can lead to significant deviation from the correct response due to steady aerodynamic nonlinearity. To solve the incompatibility at high wind speeds, a methodology of subtraction of pseudo-steady effects from the aeroelastic model is put forward in this work. Finally, with the method presented, aeroelastic nonlinearity resulted from the mean wind response is investigated at both moderate and high wind speeds.

Keywords： bridge aerodynamics nonlinear aeroelastic model Pseudo-steady mean wind loads

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General expression for linear and nonlinear time series models

Ren HUANG, Feiyun XU, Ruwen CHEN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 15-24 doi: 10.1007/s11465-009-0015-z

Abstract: However, some nonlinear factors are within the practical system; thus, it is difficult to fit the modelThis paper proposes a general expression for linear and nonlinear auto-regressive time series modelsexperiments show that the GNAR model can accurately approximate to the dynamic characteristics of the most nonlinear

Keywords： linear and nonlinear autoregressive model system identification time series analysis