Research on synchronous gear pump

Based on a comprehensive analysis of the structure and existing problems ofthe gear pump, provided a structure principle of a synchronous gear pump.The discussionsfocused on the working principle, construction features and finite element analysis ofthe hydraulic gear.The research indicates that the new pump has such advantages aslower noise, better distributed flow and a high work pressure, and it can be widely used inhydraulic systems.

The Original Connection of Synchronous Motor

The proposed mechanism was described earlier in the article: Synchronous Motor for the Vehicle, Volume 9, Number 3, March 2017. This article contains some explanations about a synchronous motor with a built-in excitation generator, the stator of which can rotate and is connected through an asymmetric differential.

Research on Instantaneous Angular Speed Signal Separation Method for Planetary Gear Fault Diagnosis

Planetary gear train is a critical transmission component in large equipment such as helicopters and wind turbines. Conducting damage perception of planetary gear trains is of great significance for the safe operation of equipment. Existing methods for damage perception of planetary gear trains mainly rely on linear vibration analysis. However, these methods based on linear vibration signal analysis face challenges such as rich vibration sources, complex signal coupling and modulation mechanisms, significant influence of transmission paths, and difficulties in separating damage information. This paper proposes a method for separating instantaneous angular speed (IAS) signals for planetary gear fault diagnosis. Firstly, this method obtains encoder pulse signals through a built-in encoder. Based on this, it calculates the IAS signals using the Hilbert transform, and obtains the time-domain synchronous average signal of the IAS of the planetary gear through time-domain synchronous averaging technology, thus realizing the fault diagnosis of the planetary gear train. Experimental results validate the effectiveness of the calculated IAS signals, demonstrating that the time-domain synchronous averaging technology can highlight impact characteristics, effectively separate and extract fault impacts, greatly reduce the testing cost of experiments, and provide an effective tool for the fault diagnosis of planetary gear trains.

DETECTION OF INCIPIENT LOCALIZED GEAR FAULTS IN GEARBOX BY COMPLEX CONTINUOUS WAVELET TRANSFORM

As far as the vibration signal processing is concerned, composition ofvibration signal resulting from incipient localized faults in gearbox is too weak to be detected bytraditional detecting technology available now. The method, which includes two steps: vibrationsignal from gearbox is first processed by synchronous average sampling technique and then it isanalyzed by complex continuous wavelet transform to diagnose gear fault, is introduced. Twodifferent kinds of faults in the gearbox, i.e. shaft eccentricity and initial crack in tooth fillet,are detected and distinguished from each other successfully.

CAN-based Synchronized Motion Control for Induction Motors

A control area network （CAN） based multi-motor synchronized motion control system with an advanced synchronized control strategy is proposed. The strategy is to incorporate the adjacent cross-coupling control strategy into the sliding mode control architecture. As illustrated by the four-induction-motor-based experimental results, the multi-motor synchronized motion control system, via the CAN bus, has been successfully implemented. With the employment of the advanced synchronized motion control strategy, the synchronization performance can be significantly improved.

Multi-motor Drive System Based on Adjacent Coupling Error Strategy

A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the synchronous error among adjacent motors simultaneously. In the strategy, due to non-linear effects of the two mentioned errors to the motion control of motor i, an adaptive fuzzy logic controller is designed to decide the control variable of the motor drive system. The multi-motor drive system is modeled and simulated by SIMULINK. The simulated researches show that the proposed strategy improves the synchronization, stabilization, and convergence of the multi-motor system.

基于BA-BP的汽车同步器齿毂误差溯源

同步器齿毂是汽车变速器装置的重要零件,其加工质量对变速器的性能、可靠性有直接影响。针对人工经验判断齿毂误差源范围效率较低的问题,本文提出一种基于蝙蝠算法优化BP神经网络的误差溯源方法,分析齿毂加工过程中的误差来源,利用蝙蝠算法对权值和阈值进行优化,获取最优值后构造BA-BP误差溯源模型,并采集数据样本对模型进行验证并与未优化之前的BP神经网络的误差溯源方法进行对比。与未优化之前BP神经网络溯源模型准确率83.56%相比,优化后的准确率为96.34%,该方法使溯源准确率明显提高,支持生产人员对后续的超差工件进行误差原因追溯,对生产过程中存在的问题直接进行处理排除,提高生产效率。

双驱同步橡胶齿轮泵式滤胶机滤网孔径对胎侧胶性能的影响

采用一种双驱同步橡胶齿轮泵式滤胶机对轮胎胎侧胶进行过滤,研究滤网孔径对胎侧胶性能的影响。结果表明:经过过滤的胶料的性能优于未过滤的胶料,且采用孔径0.070 mm(200目)滤网过滤的胶料的硫化特性、物理性能和耐屈挠性能最优,Payne效应最弱,动态力学性能较好;与未经过过滤的硫化胶相比,采用0.070 mm孔径滤网过滤的硫化胶的拉伸强度提高33.0%,撕裂强度提高33.3%,平均龟裂等级降低3级。

混合动力汽车无同步器AMT主动同步控制策略

以混合动力商用车电控机械式自动变速器(Automated Mechanical Transmission,AMT)换挡过程为研究对象,以减小换挡冲击和缩短换挡时间为目的,使用Simulink搭建了包含动力源动态协调与基于最优控制原理的电动机主动同步控制的无同步器换挡控制模型,并使用AMESim建立了动力系统及整车动力学仿真模型;以5挡升至6挡为例,采用AMESim与Simulink开展联合仿真分析,并与传统换挡策略的换挡性能进行了对比。仿真结果表明,换挡过程中,同步时间缩短21.42%,最大冲击度减少24.88%,整个换挡时间缩短18%。最后,基于dSPACE半实物仿真平台对所提控制策略进行了实时验证。

自升式海工平台升降系统改进优化设计

以自升式钻井平台改造为自升式风机作业平台为研究对象,以提升升降系统抬升能力及安全性为目标,通过对升降系统的抬升齿轮、驱动电机、动力系统、控制与检测系统进行选型计算,选择满足平台需要的合适的设备替换旧系统,使升降系统满足预定用途,同时满足规范及安全性要求。通过抬升试验及FMEA验证了改造后的系统的稳定性。

国家会议中心二期开合屋面传动系统技术研究与应用

国家会议中心二期项目开合屋面的传动系统技术应用为国内首创,驱动系统采用齿轮-齿条机构和浮动啮合驱动装置,最大的开合屋面45 m×10.5 m,重达约55 t,由7个动力系统同步驱动。机械及电气控制系统的重复运动定位精度达到3 mm范围,保证达到同步精确要求;轨道凹坑设计,实现屋盖竖向提升,解决密封胶条的压紧与松弛。开合屋面即能满足下面花园自然通风,又可达到消防排烟功能。

双轴桨叶混合机的几种结构形式探讨

混合是饲料配料和面粉配粉生产加工过程中的重要环节之一,配料效果很大程度上取决于混合机,随着配料工艺的提升,对混合机的要求也越来越高,混合机也经历了多种形式和规格的发展。通过对几种双轴桨叶混合机结构形式的研究,对几种双轴桨叶混合机的结构形式和优缺点进行阐述,为工艺设计和工厂选择提供参考。

某变速箱同步器齿毂粉末冶金成形模具设计

针对某变速箱同步器齿毂的结构特点,以及粉末冶金模具设计中成形速度和成形速率相等原理设计同步器齿毂成形模具。采用变模数设计法设计成形阴模,对定位孔用成形芯棒设计方案,将设计的模具图建立模具组立图,分析设计模具方案可行性。通过模具装机实验,验证成形模具设计合理性。结果表明,试生产的齿毂经过整形烧结等工艺均符合汽车公司在尺寸、精度及功能等方面要求,成功实现了降本增效和同步器齿毂成形模具的开发。

拉线制作用钢绞线折弯机齿轮同步伺服控制方法

钢绞线折弯机齿轮控制受到多种干扰因素的影响,如负载变化、摩擦力、温度等,导致控制精度降低,甚至可能引发安全事故。因此,提出了拉线制作用钢绞线折弯机齿轮同步伺服控制方法。初步确定钢绞线折弯机齿轮的控制参数,计算钢绞线折弯机齿轮的雅可比矩阵,构建拉线制作用钢绞线折弯机齿轮的同步控制函数,求解钢绞线折弯机齿轮的最优同步控制值。实验结果表明,该控制方法具有优异的伺服控制能力。

双电机刚性齿轮传动系统转矩均衡控制

传统双电机刚性齿轮传动系统长时间运行后,齿轮的磨损和形变增大,导致两台电机间输出的电磁转矩差值随之增大,此时单台电机存在过载的风险。针对上述问题,提出一种基于交叉耦合控制算法的转矩均衡控制策略,通过设计转矩同步控制器,将两台电机转矩控制作为一个整体来考虑,选取合适的耦合同步系数,通过交叉反馈对各台电机的转矩给定值分别进行补偿,最终实现输出转矩的均衡控制。仿真和实验结果验证了所提控制策略的正确性和有效性。

电动客车AMT换挡过程控制策略的研究

针对电动客车BK6122EV存在的换低挡困难问题,通过建立换挡过程的数学模型和仿真,分析了换挡控制参数对换挡过程的影响,提出了根据目标挡位选取适当的目标调速值以改善换挡质量的控制策略;接着对基于Pro/E和ADAMS建立的模型进行了动力学仿真,提出了目标调速值的设定原则;最后通过实车试验验证了该策略可缩短换挡时间,提高换挡的平顺性。

钢丝绳传动在航空光学遥感器上的应用

针对某航空光学遥感器扫描组件和消旋组件需以高精度同步旋转的要求,提出一种通过双电机驱动,采用独立的位置环和速度环控制的钢丝绳精密传动方法。首先,详细介绍了钢丝绳精密传动的结构形式和控制方法,并简要分析了钢丝绳的传动刚度,最后,通过实验对钢丝绳精密传动的精度进行测试,同时分析了预紧力和负载力对精度的影响。实验结果表明:本钢丝绳精密传动系统实现了扫描组件和消旋组件旋转同步精度0.03°,旋转速度为5°/s时稳速精度达1.5%,满足设计要求。实验结果验证了本钢丝绳精密传动应用方法的可行性,为钢丝绳精密传动在航空光学遥感器上的应用提供了一种新的方法。

同步双驱动多级混合齿轮减速器的刚体动力学研究

建立内部激励及外部激励共同扰动下的单级齿轮系统刚体啮合耦合振动分析数学模型,以同步双驱动的多级混合齿轮减速器为研究对象,利用ADAMS动力学仿真平台,添加由轮齿间啮合刚度、阻尼系数及轮齿间摩擦等内部激励计算得到的Impact碰撞函数,并考虑同步驱动时波形负载的外部激励影响,完成减速器动力学模型建立和仿真。对关键零部件进行时域动力学仿真并进行FFT变换,得到轮齿间啮合力的时域及频域动力学曲线图,由分析结果可知,仿真值与理论值吻合度较高。

同步双频感应加热电源的研究

针对齿轮等具有凹凸结构的工件对感应加热淬火的特殊要求,同步双频感应加热电源应运而生。同步双频感应加热齿轮淬火不仅精简了齿轮的制造工艺,也降低了能耗,提高了效率。对感应加热电源及同步双频感应加热电源进行了研究,详细分析了同步双频感应加热电源的电路结构及应用优势,并进行了理论分析和仿真研究。采用1台MPS系列MOSFET高频感应加热电源以及1台IPS系列IGBT冲频感应加热电源搭建试验台,对一件12齿的齿轮工件进行同步双频感应加热的试验,验证了该双频拓扑结构和参数的正确性,得到的电路波形与仿真波形基本吻合。

基于同步角的单输入齿轮分流传动系统均载特性分析

针对某单输入齿轮分流传动系统,给出系统存在误差情况下同步角的原理,推导双联轴的扭转变形、齿轮的啮合变形和齿轮的中心位移引起的分流级大齿轮偏转角。在此基础上,研究双联轴的扭转刚度、支撑刚度、阶梯轴的弯曲变形及系统误差对传动系统静态均载特性的影响。研究结果表明:影响分流级大齿轮偏转角的主要因素为双联轴的扭转变形和齿轮的中心位移;减小双联轴的扭转刚度可改善系统的均载性能;阶梯轴的弯曲变形对系统的均载特性有影响;系统的均载特性对双联轴的支撑刚度敏感;并车级综合误差对系统均载特性的影响比分流级综合误差的大。