基于磁弹性效应的磁头型扭矩传感器

开发了一种新的扭矩测量系统 ,此系统由磁弹性扭矩传感器、数字信号处理器和旋转编码器等组成。通常 ,磁弹性扭矩传感器的性能在很大程度上取决于轴材料 ,如果轴材料的磁特性不均匀一致、各向同性 ,则作用扭矩的瞬时值不可能检测。然而采用本文开发的系统 ,可以准确地实时测量作用扭矩的瞬时值 ,因此这种系统可以广泛地应用于扭矩的在线实时测量。     

旋转编码器在斗轮堆取料机上的应用

介绍了旋转编码器在斗轮堆取料机的应用情况,实践证明,利用可编程序控制器的高速计数器功能配合旋转编码器的使用,可有效地实现对回转角度的测量和对设备的回转保护功能,能够达到定位准确、调整方便、安全可靠的目的.     

一种塑料排水板插板设备的自动化控制系统

本发明公开了一种塑料排水板插板设备的自动化控制系统,其包括电控系统和机械传动系统,电控系统由主令控制器、可编程逻辑控制器和旋转编码器组成,机械传动系统由电动机、减速器、离合器和制动器组成;主令控制器控制可编程逻辑控制器,旋转编码器与卷扬机     

优化桁架式鹤管旋转编码器维护方式

用于桁架鹤管对位的旋转编码器出现故障时，会使鹤管伸入槽车长度迭不到安全要求，甚至损坏桁架鹤管和装运槽车。而原始的维修过程耗时长。劳动强度大。研究旋转编码器安装作用方式，对旋转编码器维护方式进行合理优化，大大提高检修效率。     

高速和低速设备测速方案的实际应用

结合现场设备,对高速运转设备采用接近开关结合齿盘的方式获取脉冲输入源,对低速旋转设备采用高脉冲数编码器获取脉冲输入源,同时通过设计编码器和旋转设备的连接轴,实现了可靠的测速以及不停机在线维护。     

基于旋转编码器的喷涂线控制系统设计

根据喷涂流水线的工作流程及控制要求,设计了基于PLC的喷涂线喷枪控制系统,该系统是由光电传感器检测工件的位置、旋转编码器和PLC内部的高速计数器实现工件的位置控制,并通过PLC的运算和逻辑控制能力控制光电传感器和旋转编码器的信号,以实现对喷枪工作状态的控制.     

AMR磁传感器横轴效应两种补偿方法的对比研究

对三轴各向异性磁电阻(AMR)磁传感器横轴误差的旋转补偿法和非旋转补偿法进行对比分析,结果表明:旋转补偿法的偏差为0.002,非旋转补偿法的偏差为0.004;旋转补偿法的精度比非旋转补偿法的精度提高了将近一倍。     

可逆配料小车变频定位系统

设计了一套可逆配料小车变频定位系统。系统由S7-200PLC、变频器、旋转编码器和无线通信模块组成。该系统在新疆某矿业应用后,运行稳定、可靠。     

光学式旋转编码器在轮胎硫化机上的应用

指出了主令控制器的缺点，简要介绍了光学式旋转编码器在１３１０Ⅱ型子午线轮胎定型硫化机上的应用。     

全干熄模式的CDQ提升机安全控制技术

介绍了全干熄模式的CDQ提升机的配置模式和控制特点,对CDQ提升机安全控制技术所涉及的位置旋转编码器安全控制、提升机同时走行安全控制和提升机区间监测技术进行了剖析,提出了相应的解决方案,供采用类似工艺的自动控制系统参考。     

Dynamic mechanical properties of magnetorheological elastomers based on polyurethane matrix

Magnetorheological elastomers (MRE) are mainly composed of soft magnetic particles and rubber‐like matrix. Previous studies have shown that the matrix has a greater impact on mechanical properties of MRE. In this article, a new kind of polyurethane material was fabricated and used as the matrix of MRE. The effect of several factors on the mechanical properties of MRE samples was experimentally studied, such as fabrication condition, content of iron particles, different weight ratio of castor oil and diphenylmethane diisocyanate, plasticizer. Their microstructures were observed, and the mechanical properties were measured using a testing system in the presence of an external magnetic field. The experimental results demonstrate that these factors have different impact on shear storage modulus, magneto‐induced modulus, MR effect and damping property. In addition, the damping property of these MRE is also higher than that of MRE based on the other matrix. This study can hopefully be applied to optimize the mechanical properties of MRE. POLYM. COMPOS., 37:1587–1595, 2016. © 2014 Society of Plastics Engineers     

Enhancement of the rheological properties of magnetorheological elastomer via polystyrene-grafted carbonyl iron particles

In this work, carbonyl iron particles (CIP) was grafted with polystyrene coating on its surface via polymerization method, and the coated-CIPs were then embedded into a silicone rubber with the ratio of 70:30 of CIP to silicone rubber in order to enhance the rheological properties of magnetorheological elastomer (MRE) in terms of lower initial storage modulus and higher MR effect. By using field emission scanning electron microscopy (FESEM) that is equipped with the energy dispersive X-ray spectroscopy for elemental analysis, it was observed that elements of C, N, O, Si, Fe, Br, Cu, and Sn were detected, confirming that the coating layer has been successfully developed on the CIP. Additionally, the investigation of the rheological characteristics was conducted at 25°C with three different sweep conditions using rheometer MCR 302. Firstly the strain amplitude was swept from 0.001% to 10% strain with 1 Hz frequency. Then, the frequency was varied from 1 Hz to 100 Hz under 0.01% strain at an applied current of 0–5 A. Lastly, the current was swept from 0 to 5 A under 0.01% strain amplitude and 1 Hz excitation frequency. It was discovered that the storage modulus of the polystyrene-coated CIP MRE is lower than that of uncoated-CIP MRE in all three sweep profiles. Advantageously, the magnetorheological (MR) effect of the coated-CIP MRE sample is higher than that of the uncoated-CIP MRE by 28.04%. Moreover, it was found that the coated-CIP MRE exhibited higher damping behavior with more than 0.14 loss factor than 0.12 loss factor of the uncoated sample. The dimensional stability of polystyrene coating on the CIP was an attributing factor to this enhanced damping behavior of the coated-CIP MRE. Thus, it became clear that the polystyrene-coated CIP embedment in MRE is more desirable than that of MRE with uncoated CIP.     

Magnetic (ethylene–octene) elastomer composites obtained by extrusion

Most research on magnetorheological elastomer (MRE) composites is focused on achieving the best magnetic and magnetorheological properties of composites. Less attention is paid to obtain adequate strength properties. The aim of this study was to receive MRE composites with the best mechanical characteristics. Thermoplastic ethylene–octene rubber composites, filled with different magnetoactive particles were reported. The use of extrusion method instead of traditional preparation processes (two‐roll mill, mixer) of composites was also presented. Ferromagnetics: micro‐ and nano‐sized iron oxides, as well as gamma iron oxide and carbonyl iron powder were found to be an active fillers improving both mechanical and magnetic properties of rubber. Application of extrusion process affected mechanical properties of MRE composites and the dispersion of magnetic fillers. Dynamic mechanical analysis (DMA) indicates the presence of strongly developed secondary structure in vulcanizates. Studies investigated by vibration sample magnetometer (VSM) proved that all composites exhibit adequate magnetic properties, predispose them for plenty of applications with the most promising being nowadays tunable vibration absorbers. POLYM. ENG. SCI., 57:520–527, 2017. © 2016 Society of Plastics Engineers     

Magneto-piezoresistive characteristics of graphene/room temperature vulcanized silicon rubber-silicon rubber magnetorheological elastomer

The effect of graphene with different content on the magneto-piezoresistive characteristics of graphene/room temperature vulcanized silicon rubber (GR/RTV) magnetorheological elastomer (MRE) was studied, and the relationship between the content of graphene and conductivity of GR/RTV-MRE was described based on the general effective medium theory. A magneto-piezoresistive model was established to describe the relationship among resistance, pressure, and magnetic field based on the magnetic dipole and tunneling theory. The samples of GR/RTV-MRE with different content of graphene were prepared. The experimental platform with magneto-piezoresistive characteristics controlled by magnetic field was built. The effect of graphene with different content on piezoresistive coefficient of GR/RTV-MRE was obtained under different magnetic flux density. The experimental results showed that the piezoresistive coefficients of samples with different content of graphene decrease with the increase of magnetic flux density in the range of 0 ~ 80mT. For the same magnetic field, when the volume fraction of graphene is less than 12%, the piezoresistive coefficient is positively correlated with it, when the volume fraction of graphene is more than 12%; the increase of content has little effect on the piezoresistive characteristics. The experimental results are compared with theoretical calculations for correction and error analysis. The results showed that the modified model can well describe the variation of the resistance of GR/RTV-MRE under magnetic field and pressure.     

各向同性与各向异性天然橡胶磁流变弹性体的导热性能及磁流变性能（英文）

采用羰基铁粉粒子填充天然橡胶磁流变弹性体(MRE),研究了各向同性与各向异性MRE的磁流变性能及导热性能。结果表明,各向异性MRE的热扩散系数和导热系数比各向同性MRE分别提高了30. 1%和41. 9%。同时,随着应变的增大,MRE的相对磁流变效应呈下降趋势,而在相同应变下,各向异性MRE的储能模量以及相对磁流变效应均高于各向同性MRE。     

PVC基磁流变弹性体的制备及性能表征

制备了以聚氯乙烯(PVC)糊树脂为基体的磁流变弹性体(MRE);研究了其静态力学性能、动态力学性能、SEM形貌和热降解性能.实验结果表明:PVC基磁流变弹性体的断裂强度随铁粉含量呈现出先上升后下降的趋势,磁致模量、相对磁流变效应和损耗因子均随铁粉含量的增加而增大,损耗因子几乎不依赖于磁场强度.当铁粉质量分数为80％时,最大磁致模量为1.06 MPa,损耗因子最大为0.35.TGA结果说明:随着铁粉含量的增加,PVC基MRE的热降解趋势增强.     

Influence of magnetic field upon the electric capacity of a flat capacitor having magnetorheological elastomer as a dielectric

The flat capacitor is built of two non-magnetic plates (with dimensions 0.065 m × 0.050 m) between which there is a layer of magnetorheological elastomer (MRE). The thickness of the layer is 0.0015 m ± 10%. MRE is based on silicone rubber and iron particles. The iron particles diameter ranges between 0.12 μm and 0.75 μm. The electric capacity, in absence of the magnetic field, is 377 ± 1 pF. In cross magnetic field with strengths up to 94 kA/m, the flat capacitor's capacity increases by up to 200%. For well chosen values of the intensity of the magnetic field, the capacity of the flat capacitor with MRE changes with time. The experimental results obtained in this manner are discussed.     

油田用磁流变弹性体室内研究

磁流变弹性体（MRE）是将磁性粒子分散在高聚物基体中,固化后形成的复合材料.相较于磁流变液,具有不易沉降、性能稳定、控制可逆、响应迅速等优点,MRE作为新兴的智能材料,在石油钻采领域有广泛的应用前景.制备了以天然橡胶（NR）为基体,不同磁性粒子含量的各向同性和各向异性MRE,分析了样品的磁流变性能、物理机械性能和耐油性能.结果表明,随着磁性粒子含量的上升,样品的磁流变性能、交联密度、热稳定和耐油性能都明显提升,但力学性能所下降.在500 mT外加磁感应强度下,50％的各向异MRE相对磁流变效应为26.87％,绝对磁流变效应为0.61 MPa.     

NR/SBR并用橡胶基磁敏橡胶的制备及性能的研究

通过湿法预处理,用偶联剂KH-570对羰基铁粉进行表面改性,制备了综合性能较好的并用橡胶基实用型磁敏橡胶,研究了羰基铁粉含量对天然橡胶/丁苯橡胶(NR/SBR)并用橡胶基磁敏橡胶性能的影响;同时利用扫描电镜研究了改性羰基铁粉表面和磁敏橡胶复合材料断面的微观结构。结果表明,通过偶联剂改性的羰基铁粉其晶体结构未发生变化,且表面有一层致密的包覆层;以NR/SBR并用橡胶为基体的磁敏橡胶,当羰基铁粉用量为300份时,可表现出较好的机械性能和磁流变效应。     

Investigation on variable shear modulus of magnetorheological elastomer based on natural rubber due to change of fabrication design

A magnetorheological elastomer (MRE) is a smart material that has a reversible and variable modulus in a magnetic field. Natural rubber (NR), which has better mechanical properties than other rubbers, was used as the matrix. Carbonyl iron powder (CIP) was selected for the generation of a magnetic field‐dependent modulus in the MREs. The MRE specimens were cured in an anisotropic mold, which was used to induce a magnetic field. SEM images validated the CIP orientation. The shear modulus of the MREs was evaluated under a magnetic field induced by a magnetic flux generator (MFG). An evaluation system was designed that includes an MFG, which is a device that generates a magnetic field via a continuously variable‐induced current to determine the magnetic field‐dependent shear modulus. The variations of the shear modulus were observed with increasing CIP volume fraction and induced current. The experimental results revealed that the maximum variation rate of the shear modulus was 76.3% for 40 vol% of CIP and an induced current of 4 A. Using these results, the appropriate CIP volume fraction and induced current can be proposed as the guidelines in fabrication design of MREs based on NR. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers