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Simple accurate expressions for planar spiral inductances
Inductance spiral inductors inductance inductance measurement inductive circuit
2015/8/11
We present several new simple and accurate expressions for the inductance of square, hexagonal, and octagonal spiral inductors. We evaluated the accuracy of our expressions, as well as several previou...
无线通讯用硅基微小Spiral天线的设计和制作
微小 spiral天线 硅基底 IC工艺
2014/4/28
微小双波段天线通过采用微电子加工工艺在高电阻率硅片上被设计和制备，测试得到天线基本为全向辐射，增益为2.8dBi，谐振频率分别为7.6GHz 和20.2 GHz，反射系数分别为25dB 和23dB，此天线的设计制造利于IC集成。文章还重点对天线的制作工艺进行了详细地介绍，对于以后此类研究具有一定的参考价值。
四轴联动数控螺旋锥齿轮铣齿机的齿长曲率修正（4-axis CNC Spiral Bevel Gear Machine Tooth-profile Lengthwise Curvature Modification）
螺旋锥齿轮铣齿机 加工坐标系 轮齿接触分析
2010/12/28
常规机床对螺旋锥齿轮的齿长曲率进行修正时，需从机床上拆装铣刀盘，并重新调整其行程直径，过程繁琐。对此利用国产四轴数控铣齿机，建立铣齿加工坐标系，以及径向刀位、切削滚比变化多项式。用轮齿接触分析（TCA）的方法，以被加工齿面的接触路径、传动误差作为评价目标，研究径向刀位、切削滚比的变化对齿长曲率修正的规律。TCA分析及铣齿实验结果表明，不改变铣刀盘直径，即可实现对齿长曲率的修正，同时可更加灵活地控制...
金属板材数控渐进成形螺旋线轨迹生成（Generation of Spiral Tool Path for Sheet Metal CNC Incremental Forming）
无模成形 螺旋线 STL模型 成形轨迹
2009/11/24
在分析金属板材数控渐进成形特点的基础上，指出现行等高线运动成形方式存在的问题，提出了一种基于螺旋运动的数控渐进成形方式和基于STL数据模型的螺旋线成形加工轨迹的生成算法。利用顶点偏置方法生成STL模型的等距模型，采用一系列水平面和与Z轴平行的平面分别切割该等距模型，求出其交线的交点，并将其连接成螺旋线成形加工轨迹。算法应用实例表明，该算法能够生成无干涉的螺旋线成形加工轨迹。
重型弧齿锥齿轮铣齿机数控加工模型建立与仿真（Model and Simulation for Numerical Control Machining of Heavy Duty Spiral Bevel Gear Cutting Machine）
弧齿锥齿轮 重型铣齿机 数控加工模型
2009/11/3
通过分析弧齿锥齿轮加工原理及传统机械摇台式弧齿锥齿轮铣齿机的结构和机床运动关系，建立了弧齿锥齿轮铣齿机加工坐标系。采用刀盘主轴进给方式代替传统的整体工件箱部件或摇台部件进给方式，建立了重型弧齿锥齿轮铣齿机三维结构模型。分析了由传统机械摇台式弧齿锥齿轮铣齿机调整参数转变为重型数控弧齿锥齿轮铣齿机调整参数的原理和计算方法，建立了重型弧齿锥齿轮铣齿机的数控加工模型。通过计算实例，得到了重型数控弧齿锥齿轮...
HEAT TRANSFER STUDIES ON SPIRAL PLATE HEAT EXCHANGER
spiral plate heat exchanger Reynolds number nusselt number
2009/10/14
In this paper, the heat transfer coefficients in a spiral plate heat exchanger are investigated. The test section consists of a plate of width 0.3150 m, thickness 0.001 m and mean hydraulic diameter o...
A Sweep-Line Algorithm and Its Application to Spiral Pocketing
Monotone chain sweep-line self-intersection spiral pocketing line-offset
2009/8/19
This paper presents an efficient line-offset algorithm for general polygonal shapes with islands. A developed sweeplinealgorithm (SL) is introduced to find all self-intersection points accurately and ...
机床误差对螺旋锥齿轮齿形的影响规律（Effect of Machine Tool Errors on the Tooth Form of Spiral Bevel Gears）
螺旋锥齿轮 机床误差 齿形 理论齿面
2009/8/11
基于螺旋锥齿轮齿面分析的数学模型，采用最优化算法和一种新的计算齿形误差的方法，计算了误差齿面与理论齿面在理论齿面法线方向的齿形误差。通过引入机床调整误差和刀具参数误差，分析了各种误差对螺旋锥齿轮齿形的影响规律，以图形的方式表示了误差齿面相对于理论齿面的偏离方向以及误差值的大小，为机床的精度设计、齿形误差的修正以及指导实际加工提供了理论依据。通过实际的磨齿加工和检测对算法以及分析结果进行了验证。
阶梯螺旋孔口式孔板消能降压装置性能（Performance on the Orifice Energy Dissipation and Decompression Equipment of the Step and Spiral-orifice Style）
阶梯螺旋孔口 消能降压 装置
2009/5/22
提出一种管道孔板消能装置，利用孔板扭转形成阶梯螺旋孔口使水流强制扭转，因水流在短距离内瞬间作较大角度的扭转而形成强度较大的螺旋流，其消能降压比率较高，并可在较大范围内进行调节，是一种农业节水灌溉管道系统消能降压装置，可用于农业节水灌溉供水系统和其他类似需要消能降压的管道系统。
A Numerical Study on Fully Developed Fluid Flow and Heat Transfer in a Spiral Finned Tube
fluid flow and heat transfer numerical simulation finned tube
2009/4/28
In this paper, the standard k-ε two-equation model is adopted to numerically simulate fully developed fluid flow and heat transfer in a spiral finned tube within a cracking furnace for ethylene manu...
研究了基于数控加工螺旋锥齿轮齿面误差修正技术。提出了一种由摇台型机床调整参数向Free-Form机床转换的方法，建立了基于数控加工齿面误差模型；在此基础上，以齿面误差平方和最小为目标函数，优化摇台型机床调整参数，再将其转换为数控加工形式，从而实现数控齿面修正。最后通过算例表明，经过改变加权系数和优化可以达到齿面误差较高精度修正要求。 Based on NC machining, the tooth...
The Influence of Component Yarns’ Characteristics and Ring Twisting Frame Settings on the Structure and Properties of Spiral, Loop and Bunch Yarns
fancy yarns spiral loop bunch ring twisting statistical models
2009/2/11
The aim of this research is to provide reliable information, provided in the form of statistical models, regarding the possibilities of modifying the structure and the mechanical properties of fancy y...
Effects of the Spiral Grain on Some Physical Properties of Calabrian Pine（Pinus brutiaTen.）Wood
Spiral grain Physical properties Calabrian pine
2009/1/14
In this study, the effects of spiral grain on some physical properties of the Calabrian pine (Pinus brutia Ten.) wood were investigated. For this purpose, 17 sample trees with various spiral grain ang...
The Effects of Spiral Grain on some Mechanical Properties of Calabrian Pine（Pinus Brutia Ten.）Wood
Spiral grain Pinus brutia Mechanical properties
2009/1/14
The effects of spiral grain on some mechanical properties of Calabrian pine wood were studied. For this purpose, 17 sample trees were taken from Çakirlar region, Antalya district. The experime...
Development of a Spiral Mesh Bioreactor with Immobilized Lactococci for Continuous Inoculation and Acidification of Milk
immobilized lactococci continuous acidification immobilized cell bioreactor continuous inoculation
2008/3/18
A laboratory-scale bioreactor with lactococci immobilized in calcium alginate gel was developed for continuous acidification and inoculation of milk. Cells were entrapped in a calcium alginate film co...