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带温度补偿的改进型注塑机锁模力传感器设计与实现

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传感技术学报 2024年第1期37卷 1-7页

作者：邓俊文颜幸尧胡美君陈潘布衣聂德明中国计量大学计量测试工程学院浙江杭州310018 杭州职业技术学院友嘉智能制造学院浙江杭州310018

目前国内外注塑机行业所使用的实时在线锁模力传感器均为双侧半桥模式,且大部分不带哥林柱温度补偿功能,因此在精度、分辨率等性能上还有较大的提升空间。设计了一款双侧全桥并带哥林柱温度补偿的改进型注塑机锁模力传感器,并进行了上... 详细信息

目前国内外注塑机行业所使用的实时在线锁模力传感器均为双侧半桥模式,且大部分不带哥林柱温度补偿功能,因此在精度、分辨率等性能上还有较大的提升空间。设计了一款双侧全桥并带哥林柱温度补偿的改进型注塑机锁模力传感器,并进行了上机验证。单个锁模力传感器主要由两片受力敏感片和两片不受力温度补偿片组成,每根哥林柱的两侧各使用一个传感器,组成双侧类全桥电路进行锁模力检测。实验结果表明,与目前行业普遍采用的双侧半桥模式锁模力传感器相比,本改进型传感器在不同锁模力载荷下,精度更高,线性度更好;四个通道的拟合决定系数R2均在0.9997以上,最大绝对误差为25 kN,最大相对误差为3.753%,最大锁模力重复性精度为2.430%。

关键词：锁模力传感器温度补偿锁模力应力测量哥林柱

A fluctuating lattice-Boltzmann model for direct numerical simulation of particle Brownian motion

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Particuology 2009年第6期7卷 501-506页

作者： deming nie Jianzhong Lin State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China China Jiiiang University Hangzhou 310018 China

A single-relaxation-time fluctuating lattice-Boltzmann （LB） model for direct numerical simulation （DNS） of particle Brownian motion is established by adding a fluctuating component to the lattice-Boltzmann equations （LBEs）. The fluctuating term is proved to be the random stress tensor in fluctuating hydrodynamics by recovering Navier-Stokes equations from LBEs through a Chapman-Enskog expansion. A three-dimensional implementation of the model is also presented, along with simulations of a single spherical particle and 125 spherical particles at short times. Numerical results including the meansquare displacement, velocity autocorrelation function and self-diffusion coefficient of particles compare favorably with theoretical results and previous numerical results.

关键词： Fluctuating hydrodynamics Lattice-goltzmann method Brownian motion Direct numerical simulation

安装扭矩对抱箍式锁模力仪测试结果影响的研究

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传感技术学报 2024年第7期37卷 1250-1257页

作者：胡美君颜幸尧邓俊文陈潘布衣聂德明杭州职业技术学院友嘉智能制造学院浙江杭州310018 中国计量大学计量测试工程学院浙江杭州310018

注塑机锁模力监测系统主要用于在三板式注塑机中对锁模力的实时监测,以控制产品质量和防止设备的损坏。其中抱箍安装方式的锁模力实时监测仪由于价格低,安装可靠性高等特点,被广泛采用。在实际使用中,抱箍式注塑机锁模力传感器信号的准... 详细信息

注塑机锁模力监测系统主要用于在三板式注塑机中对锁模力的实时监测,以控制产品质量和防止设备的损坏。其中抱箍安装方式的锁模力实时监测仪由于价格低,安装可靠性高等特点,被广泛采用。在实际使用中,抱箍式注塑机锁模力传感器信号的准确度,在一定范围内与所施加的抱紧力(安装扭矩)有一定相关性,对后期维护会有较大影响。对抱箍式传感器在使用中的受力情况进行了分析,根据硅胶需要满足和格林柱之间无滑移的测试条件,分析了硅胶上的拉伸摩擦力以及正压力必须满足的条件,并根据传感器头的安装结构,推导了满足硅胶受力条件时,抱箍收紧时所需的理论最小扭矩公式,最后基于自行研发的抱箍式注塑机锁模力监测仪,进行了实验。实验结果表明,在扭矩较小时(100%理论最小扭矩),抱紧力的大小对测试结果影响很大;当抱紧力达到一定阶段后(150%最小理论扭矩),测试结果趋于稳定;当抱紧力达到一定值后(≥200%最小扭矩),测试结果的精度基本不再变化。

关键词：注塑机锁模力测试仪抱箍式安装扭矩硅胶受力分析

New formula for drag coefficient of cylindrical particles

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Particuology 2011年第2期9卷 114-120页

作者： Xiaohui Guo Jianzhong Lin deming nie Institute of Fluid Mechanics ChinaJiliang University Hangzhou 310018 China State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

The drag force on a cylindrical particle is calculated using lattice Boltzmann method. The results show that the drag coefficient of a particle with different orientation angles decreases with increasing Reynolds number. When the principal axis of the particle is parallel to flow, the drag coefficient is much larger than that of others and decreases fastest with increasing Reynolds number, which becomes more obvious with increasing particle aspect ratio. When the principal axis of the particle is inclined to flow, the drag coefficient is nearly the same for different particle aspect ratios. In the case of flow with small Reynolds number （Re〈 100）, the drag coefficient decreases with increasing orientation angle at different aspect ratios and Reynolds numbers. The drag coefficient is more sensitive to particle orientation angle when the particle orientation angle is small and the aspect ratio is large. Finally, a new correlation formula for the drag coefficient of cylindrical particle is established, with which the drag force on a cylindrical particle can be directly calculated based on the Reynolds number, particle aspect ratio and orientation angle.

关键词： Cylindrical particleDrag coefficientCorrelation formulaLattice Boltzmann method

“体育课自甘风险”:构成要件辨析与应对策略

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四川体育科学 2024年第4期43卷 134-139页

作者：姜川聂真新聂德明张明艳云南师范大学体育学院云南昆明650000 四川大学法学院四川成都610000 云南格元律师事务所云南昆明650000

学校体育是我国体育强国建设的重要一环,而体育课伤害却对学校体育良性发展造成了一定的阻碍。本文将《民法典》中的自甘风险条款置于体育课之中加以讨论,并给出应对策略。基于对“一定风险的文体活动”“其他参加者”“明知”“自愿”... 详细信息

学校体育是我国体育强国建设的重要一环,而体育课伤害却对学校体育良性发展造成了一定的阻碍。本文将《民法典》中的自甘风险条款置于体育课之中加以讨论,并给出应对策略。基于对“一定风险的文体活动”“其他参加者”“明知”“自愿”“故意与重大过失”“教育、管理职责”等构成要件的辨析。拟从立法、司法、学校风险防控三个方面提出应对策略,以更好的发挥学校体育在我国体育强国建设中的价值。

关键词：自甘风险体育课民法典

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A LB-DF/FD Method for Particle Suspensions

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Communications in Computational Physics 2010年第3期7卷 544-563页

作者： deming nie Jianzhong Lin State Key Laboratory of Fluid Power Transmission and Control Zhejiang UniversityHangzhou 310027China College of Metrology and Technology Engineering China Jiliang UniversityHangzhou 310018China

In this paper, we propose a lattice Boltzmann (LB) method coupled with adirect-forcing fictitious domain (DF/FD) method for the simulation of particle suspensions. This method combines the good features of the LB and the DF/FD methodsby using two unrelated meshes, namely, an Eulerian mesh for the flow domain and aLagrangian mesh for the solid domain, which avoids the re-meshing procedure anddoes not need to calculate the hydrodynamic forces at each time step. The non-slipboundary condition is enforced by introducing a forcing term into the lattice Boltzmann equation, which preserves all remarkable advantages of the LBM in simulatingfluid flows. The present LB-DF/FD method has been validated by comparing its results with analytical results and previous numerical results for a single circular particleand two circular particles settling under gravity. The interaction between particle andwall, the process of drafting-kissing-tumbling (DKT) of two settling particles will bedemonstrated. As a manifestation of the efficiency of the present method, the settlingof a large number (128) of circular particles is simulated in an enclosure.

关键词： Lattice Boltzmann method direct-forcing fictitious domain method particle suspension numerical simulation

A Lattice Boltzmann-Direct Forcing/Fictitious Domain Model for Brownian Particles in Fluctuating Fluids

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Communications in Computational Physics 2011年第4期9卷 959-973页

The previously developed LB-DF/FD method derived from the lattice Boltzmann method and Direct Forcing/Fictitious Domain method is extended to deal with 3D particle’s Brownian *** the model the thermal fluctuations are introduced as random forces and torques acting on the Brownian *** hydrodynamic interaction is introduced by directly resolving the fluid motions.A sphere fluctuating in a cubic box with the periodic boundary is considered to validate the present *** examining the velocity autocorrelation function(VCF)and rotational velocity autocorrelation function(RVCF),it has been found that in addition to the two relaxation times,the mass density ratio should be taken into consideration to check the accuracy and effectiveness of the present ***,the fluctuation-dissipation theorem and equipartition theorem have been investigated for a single spherical ***,a Brownian particle trapped in a harmonic potential has been simulated to further demonstrate the ability of the LB-DF/FD model.

关键词： Lattice Boltzmann method fictitious domain Brownian motion

Direct Numerical Simulation of Multiple Particles Sedimentation at an Intermediate Reynolds Number

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Communications in Computational Physics 2014年第8期16卷 675-698页

作者： deming nie Jianzhong Lin Mengjiao Zheng Institute of Fluid Mechanics China Jiliang UniversityHangzhou310018China. State Key Laboratory of Fluid Power Transmission and Control Zhejiang UniversityHangzhou 310027China.

In this work the previously developed Lattice Boltzmann-Direct Forcing/Fictitious Domain(LB-DF/FD)method is adopted to simulate the sedimentation of eight circular particles under gravity at an intermediate Reynolds number of about *** particle clustering and the resulting Drafting-Kissing-Tumbling(DKT)motion which takes place for the first time are *** effects of initial particleparticle gap on the DKT motion are found *** addition,the trajectories of particles are presented under different initial particle-particle gaps,which display totally three kinds of falling patterns provided that no DKT motion takes place,*** concave-down shape,the shape of letter“M”and“in-line”***,the lateral and vertical hydrodynamic forces on the particles are *** has been found that the value of Strouhal number for all particles is the same which is about 0.157 when initial particle-particle gap is relatively *** wall effects on falling patterns and particle expansions are examined in the final.

关键词： Lattice Boltzmann method sedimentation fictitious domain falling pattern

Preparation of Rectorite-TiO_2 and Its Application in the Solar Photocatalytic Degradation of Dye Wastewater

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Wuhan University Journal of Natural Sciences 2007年第2期12卷 367-371页

作者： DENG deming nie Qiyang CHENG Kang LI Fugui GAN Fuxing School of Resource and Environmental Science WuhanUniversity Wuhan 430079 Hubei China

A photocatalyst consisting of TiO2 powder and rectorite was prepared and activated utilizing solar light and used for degradation of simulated dye wastewater （methyl solution）. The effects of roasting temperature, the way of adding rectorite, and the amount of the rectorite on the photocatalytic activity have been investigated. The results indicated that rectorite-TiO2 photocatalyst prepared with the right proportional amount of rectorite and titanium dioxide, could effectively degrade the methyl orange solution in sunlight. After reacting in sunlight for 8 hours, the methyl orange decolorization reached 96%. The photocatalytic activity of rectorite-TiO2 was much better than that of TiO2 in sunlight.

关键词： rectorite titanium dioxide photocatalytic activity solar light