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基于三线制热敏电阻的温度控制系统 被引量:2
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作者 李幸 周凤星 严保康 《仪表技术与传感器》 CSCD 北大核心 2019年第7期61-66,共6页
为满足某氮氧化物(NO x)传感器精度测试系统“传感器内部温度应维持在750 ℃以确保测试结果的准确性”的要求,通过三线制加热电路加热传感器内部热敏电阻,利用滤波算法对所采集电压信号进行预处理,并借助于电阻-电压多项式拟合法及阻-... 为满足某氮氧化物(NO x)传感器精度测试系统“传感器内部温度应维持在750 ℃以确保测试结果的准确性”的要求,通过三线制加热电路加热传感器内部热敏电阻,利用滤波算法对所采集电压信号进行预处理,并借助于电阻-电压多项式拟合法及阻-温特性分段最小二乘法非线性校正得到温度-电压关系式,最后辅以模糊自适应PID控制以达到控温750 ℃的目的。实验证明:该温度控制系统能使传感器内部温度稳定在(750±2)℃,满足了检测系统的需要。 展开更多
关键词 三线制加热 多项式拟合 最小二乘法 非线性校正 模糊自适应 PID
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Darcy–Forchheimer Three-Dimensional Flow of Williamson Nanofluid over a Convectively Heated Nonlinear Stretching Surface 被引量:4
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作者 Tasawar Hayat Arsalan Aziz +1 位作者 Taseer Muhammad Ahmed Alsaedi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2017年第9期387-394,共8页
The present study elaborates three-dimensional flow of Williamson nanoliquid over a nonlinear stretchable surface. Fluid flow obeys Darcy–Forchheimer porous medium. A bidirectional nonlinear stretching surface genera... The present study elaborates three-dimensional flow of Williamson nanoliquid over a nonlinear stretchable surface. Fluid flow obeys Darcy–Forchheimer porous medium. A bidirectional nonlinear stretching surface generates the flow. Convective surface condition of heat transfer is taken into consideration. Further the zero nanoparticles mass flux condition is imposed at the boundary. Effects of thermophoresis and Brownian diffusion are considered. Assumption of boundary layer has been employed in the problem formulation. Convergent series solutions for the nonlinear governing system are established through the optimal homotopy analysis method(OHAM). Graphs have been sketched in order to analyze that how the velocity, temperature and concentration distributions are affected by distinct emerging flow parameters. Skin friction coefficients and local Nusselt number are also computed and discussed. 展开更多
关键词 three-dimensional flow Williamson fluid nanoparticles Darcy-Forchheimer porous medium con-vective boundary condition nonlinear stretching surface
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