异齿宽齿轮泵的研究

概述了直齿轮泵和斜齿轮泵的困油特性及目前解决困油问题的方法。通过对齿轮泵的结构调整，得出消除齿轮泵的困油现象的新方法。通过与卸荷槽法进行比较，总结出异齿宽齿轮泵的优点及其技术要点，并给出了轴套的结构尺寸。     

数控车床加工效率的优选研究

以齿轮零件为例,介绍了数控车床加工时对怎样合理安排加工顺序,走刀路线、刀具的选择及切削要素的确定进行了分析,对在数控车床上加工类似零件有一定的参考价值。     

脉冲磁致振荡(PMO)凝固均质化技术在特殊钢中的应用

摘要：脉冲磁致振荡（PMO）凝固均质化技术是由上海大学先进凝固技术中心基于外场下金属凝固原理提出的原创技术。经过15年的研发,该技术已成功走向工业应用。介绍了PMO技术的原理以及在GCr15轴承钢、20CrMnTi齿轮钢和锚链钢等特殊钢工业生产中的应用情况。工业应用表明,PMO技术不仅可以显著增加铸坯等轴晶比例,改善铸坯偏析,而且可以提高铸坯拉速,并放宽对中间包过热度控制的要求。     

Effect of electromagnetic stirring methods on solidification structures of Sn-11% Sb binary alloy

In this paper,a spiral magnetic field electromagnetic stirrer,which can separately induce two different magnetic fields,is introduced. The corresponding central magnetic flux curves of the stirrer were measured by two different probes of the Tesla meter. Meanwhile,the mentioned spiral magnetic field electromagnetic stirrer was used,the effect of the two different magnetic fields on solidification of Sn-11% Sb binary alloy was studied,and the segregations and metallographic structures of the ingot samples were analyzed. The research results show that,with the same electromagnetic stirring parameters,the spiral magnetic field electromagnetic stirring is more effective in reducing the composition difference between the upper and lower parts of the ingot. The microstructure photos show that the grain size was more refined.     

齿轮毛坯正火处理后硬度不均匀的原因及改进措施

分析了Φ115mm Z20CrMoH钢齿轮毛坯正火处理后硬度不均匀的原因,采用等温正火工艺代替普通正火工艺后,齿轮毛坯得到了合适、均匀的硬度值,满足了切削加工工序对硬度的要求。     

高强度φ9.00mm螺旋肋预应力钢丝的研制

阐述了高强度Φ9.00mm螺旋肋预应力钢丝的生产工艺、力学性能和科学的几何外形。生产该钢丝所用原料是77B-1或S82BΦ13.00高线盘条。该钢丝用于建筑构件,可替代热轧带肋钢筋和冷轧带肋钢筋,简化构件生产工艺,节约钢材,降低构件成本,改善建筑结构,增大建筑物有效空间。     

故障振动信号的小波包分解与诊断

本文讨论了故障振动在小波分解下的信号特征,给出了小波包分解处理故障振动信号的原理和方法,论述了诊断信号的表达方式及其特点,给出并分析了一个变速箱多故障源的诊断实例.实践证明,作者给出的小波包分解与诊断方法具有理论和实际价值.     

变风载下风电齿轮箱内部激励规律研究及动态特性优化

风电齿轮箱作为风电机组的关键部件,其动态特性直接影响整个机组的运行。以某兆瓦级风电齿轮箱为研究对象,考虑箱体、行星架的结构柔性后,建立风电齿轮箱耦合动力学模型,并分析了其动态响应。针对单一工况所得的齿轮修形量未必适用于其它工况的问题,对各工况下的风电齿轮箱各级齿轮副内部激励进行了加权处理,以各齿轮内部激励和最小为优化目标,基于遗传算法寻求适用于多工况的最优修形量,并结合齿轮宏观参数优化来改善风电齿轮箱的动态响应。结果表明,通过宏观参数优化及齿轮修形后,各工况下风电齿轮箱的振动加速度及结构噪声均得到了有效改善。研究结果为兆瓦级风电齿轮箱动力学特性优化提供了依据。     

基于球齿轮柔性轴的姿态算法

为了实现移动平台具有轮式行进和跨步行走的双重功能,柔性轴的姿态算法根据移动平台的运动特点,建立了控制机构和轴姿态之间的关系。文中概述了柔性轴工作原理。建立了坐标变换矩阵,并计算出直线电机伸长量与柔性轴姿态之间的关系。与此同时,还对两者关系的一一对应性进行了证明,为下一步进行控制系统设计做出了数学铺垫。     

On‐Chip Spiral Waveguides for Ultrasensitive and Rapid Detection of Nanoscale Objects

Ultrasensitive and rapid detection of nano‐objects is crucial in both fundamental studies and practical applications. Optical sensors using evanescent fields in microcavities, plasmonic resonators, and nanofibers allow label‐free detection down to single molecules, but practical applications are severely hindered by long response time and device reproducibility. Here, an on‐chip dense waveguide sensor to monitor single unlabeled nanoparticles in a strong optical evanescent field is demonstrated. The spiral nanowaveguide design enables two orders of magnitude enhancement in sensing area compared to a straight waveguide, significantly improving the particle capture ability and shortening the target analysis time. In addition, the measurement noise is suppressed to a level of 10^?4 in the transmitted power, pushing the detection limit of single particles down to the size of 100 nm. The waveguide sensor on the silicon‐on‐isolator platform can be fabricated reproducibly by the conventional semiconductor processing and compatible with surface functionalization chemistries and microfluidics, which could lead to widespread use for sensing in environmental monitoring and human health.