基于CAE技术的歧管式催化转化器的设计与分析

结合歧管式净化器的性能特点及失效模式总结出了产品设计开发的一般流程，通过CFD分析、FEA 模态分析、FEA 流固耦合热应力分析等方法对歧管进行了分析，提出了歧管式净化器设计是否合理的性能评价标准，用于评判产品设计的优劣。     

基于ADAMS和ANSYS的机械臂刚柔耦合运动学分析

针对机械臂的设计要求,设计了一种由两个铰链四杆机构组成的双自由度机械臂,利用ADAMS建立机械臂的刚性体模型,仿真得到不同时刻的运动参数曲线;利用ANSYS建立指定部件的柔性体模型,得到不同阶数的模态频率和模态振型值;利用ADAMS和ANSYS进行联合仿真后,得到机械臂的刚柔耦合模型,仿真结果表明:柔性体模型在z方向发生了微小位移变化,x、y方向位移波动范围增加了10 mm。利用Altium Designer软件绘制控制电路图并进行了实物制作,实验结果表明该机械臂具有广泛的适用性。     

带压作业油管接箍探测仪的研制

研制的带压作业油管接箍探测仪主要由传感器、报警器、激磁器等部分组成。它利用油管接箍通过时对激磁器与传感器构成的稳定磁场的扰动行为,触发传感器发出脉冲信号并传递给报警器,报警器将信号处理后发出声光报警,为工作人员进行下一步的操作提供控制指令。现场应用证明:采用油管接箍探测仪可以使环形胶心工作寿命延长2倍,仅此一项,每年可节约成本84万元,取得了很好的经济效益;接箍探测仪的使用,提高了带压作业操作过程的安全性和可靠性,使生产效率大大提高;同时为带压作业实现自动控制奠定了一定基础,具有良好的推广应用前景。     

接箍夹紧变形测量与内壁圆度误差控制

油管接箍是典型的薄壁工件,在加工过程中,因夹紧力过大常造成接箍内壁螺纹圆度误差超差。为此,设计了3个传感器均布的测量方法。该方法利用3点误差分离法中的谐波抑制现象,运用NI的数据采集卡和Labview程序测量接箍在三爪卡盘下的夹紧变形量,分析夹紧变形量对加工后工件圆度的影响,得到夹紧变形量必须小于工件圆度公差要求的结论。实验结果表明,3点均布传感器的测量方法可靠,加工后接箍内壁的圆度误差和加工前的夹紧变形量基本相等。     

聚乙烯醇缩甲醛泡沫塑料负压渗水材料的改性与性能

为研究硅烷偶联剂KH550、聚硫橡胶(PR)对负压渗水材料聚乙烯醇缩甲醛泡沫塑料(PVFM)性能的影响,以聚乙烯醇、甲醛为原料,盐酸为催化剂,制备一系列改性PVFM,并测试其形貌、渗水性和力学性能等。结果表明,KH550改性PVFM可提高其饱和导水率,PR则表现相反;2种改性PVFM在-5kPa下累计入渗量比未改性PVFM少,且均随用量增加而降低;2种改性剂均对PVFM发泡点有较大程度提升;2%KH550样品密度降低43.5%,1.5%KH550样品硬度提升64.6%;5%PR改性PVFM硬度达最大值71,PR改性PVFM断裂伸长率提升29.7%~46.7%;KH550改性的PVFM孔径增大,弯曲度更简单,导致硬度减小、导水率增大;PR改性PVFM立体网状结构更致密,加之-SH疏水基团增加,导致PVFM输水能力、负压渗水性降低。综合考虑,建议使用5.0%PR改性PVFM可改善PVFM负压渗水性能与力学性能,提高其工作稳定性。     

苯酚废水电化学处理方法研究进展

苯酚的降解机理是将苯酚先降解为对苯二酚和邻苯二酚,然后降解为小分子乙二酸,最终降解为二氧化碳和水的过程。介绍了近年来苯酚废水电化学处理方法的研究进展,包括三维电极法、三维电极与电-Fenton耦合法、电催化氧化法、电-Fenton法。对这些方法做了比较,并对今后研究方向提出建议,需要在苯酚的降解工艺、降解率的影响因素及电级材料选取和制备方面做近一步的研究和探讨。     

Dynamic infant–parent affect coupling during the face-to-face/still-face.

We examined dynamic infant–parent affect coupling using the Face-to-Face/Still-Face (FFSF). The sample included 20 infants whose older siblings had been diagnosed with Autism Spectrum Disorders (ASD-sibs) and 18 infants with comparison siblings (COMP-sibs). A series of mixed effects bivariate autoregressive models was used to represent the self-regulation and interactive dynamics of infants and parents during the FFSF. Significant bidirectional affective coupling was found between infants and parents, with infant-to-parent coupling being more prominent than parent-to-infant coupling. Further analysis of within-dyad dynamics revealed ongoing changes in concurrent infant–parent linkages both within and between different FFSF episodes. The importance of considering both inter- and intradyad differences is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Evaluation of the effect of vinyltrimethoxysilane on corrosion resistance and adhesion strength of epoxy coated AA1050

The quality of surface treatment of aluminum alloy (AA1050) with vinyltrimethoxysilane (VTMS) was examined. Calculated surface energy with Van Oss, Chaudury and Good (VOCG) method showed higher surface energy of treated specimens. Chemical interaction between silane layer and aluminium surface was examined via FTIR-ATR. In addition, practical adhesion was measured in dry, wet and recovered states via pull-off method and compared to adhesion strength of desmutted and chromated specimens. Results showed good adhesion performance in dry state for silane treated specimens. Corrosion protective performance of epoxy coating in the presence of silane layer on aluminum was studied with Electrochemical Impedance Spectroscopy (EIS) and compared with coated desmutted and chromated specimens. Water sensitivity of silane layer resulted in poor protective performance of specimens treated at pH > isoelectric point (IEP).     

Synthesis and characteristics of polymacromonomers composed of alternating binaphthalene-phenylene main chain and polystyrene side chains

Well-defined polystyrene (PSt) based polymers containing middle- or end-chain 2,5- or 3,5-dibromobenzene moieties, prepared by Atom Transfer Radical Polymerization (ATRP) were implied in Suzuki type couplings with 1-naphthalene boronic acid. The resulting polymers, containing a conjugated sequence with 1-naphthyl groups at the extremities, were used as macromonomers in chemical oxidative polymerization in the presence of anhydrous FeCl₃. Polyarylenes, with a hairy-rod structure, having binaphthyl groups in the main chain and the respective PSt chains as lateral substituents, were obtained.All the starting, intermediate or final polymers were structurally analyzed by spectral methods (¹H NMR, IR) and GPC measurements. Thermal behavior of the macromonomers and final polymers was investigated by Differential Scanning Calorimetry (DSC) analyses. Optical properties of the polymers were followed by UV and fluorescence spectroscopies. The absorption spectra of the polymers indicate only a limited extend of conjugation as compared to the naphthalene functionalized polystyrenes. However, in the emission spectra of the polymers, a bathochromic shift with respect to the monomers was observed in all cases.