Research on Flexible Transfer Line Schematic Design Using Hierarchical Process Planning

Flexible transfer line(FTL)is now widely used in ma ny manufacturing domains to realize efficiently,high quantity and economic prod uction.These manufacturing domains include automobile,tractor,internal-combu stion engine,and so on.In today’s competitive business environment,it is vit ally important for machine tool manufacturers to design flexible transfer line m ore effectively and efficiently according to a wider variety of customer demand s.This paper proposes an approach to a bidding-based flexible transfer line sc hematic design system.By analyzing manual FTL design process,the architecture o f flexible transfer line schematic design system(FTLSDS)is established.The syst em consists:of four processes:part feature modeling,process planning,FTL fac i lity layout and FTL evaluation. For FTL schematic design.a five-level proces s planning strategy named hierarchical process planning method is proposed.This method includes selection of manufacturing feature machining operation;part se t-up planning,feature sequencing,operation sequencing and process plan genera ting.The major decision relies on setup planning.According to the proceeding o f the hierarchical process planning,the structure of reasoning is proposed base d on blackboard.Under this paradigm,a cooperative effort between a hybrid coll ection of knowledge sources is possible.Total reasoning task can be divided int o some subtasks,and recursive-reasoning system is formed.It is convenient for process planning with step-by-step solution.Meanwhile,the blackboard is use d as the global data exchange area during all reasoning process.By using modula r technology,special purpose machine tools can be designed more efficiently and rapidly.The framework of machine modular design system to support machine requ irement design for FTL is established.By synthesizing the FTL evaluation criter ia.five evaluation criteria of flexible transfer 1ine schematic design are take n into account.An exampie is supplied to demonstrate and verify the validity an d feasibility of flexible transfer line schematic design approach.

Research on Rapid Response Schematic Design for Flexible Transfer Line CAPP-Based

To meet the market requirements for Flexible Transf er Line (FTL), which consists of modular NC machining tools of high quality and co st saving, the methodologies and technologies of client-oriented FTL rapid resp onse schematic design CAPP-based, one of the key techniques, are presented in t his paper. In order to achieve this purpose, an integrated system for integrated design of CAD/CAPP/FTL with box-type parts is realized. In this paper, firstly the theory of the conceptual design of FTL based on CAPP is established and the software architecture is developed. The global-domain pr oduct model is put forward to meet with data representation. After the manufactu ring feature is analyzed and decomposed for machining operations, the feature-b ased part unified data model object-oriented is built. Secondly the knowledge- based CAPP system data model is established. The process planning unit model is formed by work element (WE), which is tool-cell based function abstraction meth od, and has unified layers with respect to designing and manufacturing. With WEs through dynamic response and simultaneous structure in process planning, the pr inciple solution for CAPP function system can be implemented. Lastly the mapping from process domain to module design domain is built. The unidirectional select ion process based on fuzzy matching technology is easily dealt with computer. Th e algorithm of decision with fuzzy synthetic evaluation method and technology is applied to estimate the feasibility of the results in local working procedure o f modular NC machine tools and make decision of designs in overall FTL, which co nsists of many different factors. The example shows that the rapid response desi gn in bidding-based FTL scheme design is realized.

An Operating Strategy for High-availability Multi-station Transfer Lines

Economic efficiency of a multi-station transfer line （TL） is evaluated directly by the quantity of parts produced; therefore, each single manufactured part counts. The contribution presents an approach which applies a reliability-adaptive operating strategy in combination with tool derating. It is the objective to hold the system harmonisation of tool changes as maintenance actions. The significant effectiveness of the approach is demonstrated by different configurations and contexts. The output-time function of a TL without reliability-adaptive control is compared with functions of a system with reliability-adaptive control.

Outlet Temperature Correlation and Prediction of Transfer Line Exchanger in an Industrial Steam Ethylene Cracking Process

Predicting the best shutdown time of a steam ethylene cracking furnace in industrial practice remains a challenge due to the complex coking process. As well known, the shutdown time of a furnace is mainly determined by coking condition of the transfer line exchangers (TLE) when naphtha or other heavy hydrocarbon feedstocks are cracked. In practice, it is difficult to measure the coke thickness in TLE through experimental method in the complex industrial situation. However, the outlet temperature of TLE (TLEOT) can indirectly characterize the coking situation in TLE since the coke accumulation in TLE has great influence on TLEOT. Thus, the TLEOT could be a critical factor in deciding when to shut down the furnace to decoke. To predict the TLEOT, a parametric model was proposed in this work, based on theoretical analysis, mathematic reduction, and parameters estimation. The feasibility of the proposed model was further checked through industrial data and good agreements between model prediction and industrial data with maximum deviation 2% were observed.

Magnet lattice design of the SSRF electron-beam transfer lines

Under three-dimensional plane geometrical constraints ( X,Y,θ ), with two asymmetric achromatic sections, the combined three-section structural FODO-like magnet lattice design is adopted and finely optimized in the SSRF electron-beam transfer lines. The magnet lattice has high flexibility and robustness, and the Courant–Snyder parameters can be easily adjusted within a wide range to meet the requirements of transmission and injection for different operation modes of the linear accelerator, booster synchrotron, and storage ring. In this article, the main parameters of the linear optics design of the SSRF electron-beam transfer lines are described, involving the physical design criteria, the total geometrical layout, the magnet lattice, and the beam Courant–Snyder parameters matching. The studies of the variant beam dynamic simulation program calculations show that the design purpose of the efficient beam transmission and injection will be basically achieved.

Analysis of transmission efficiency of SSRF electron beam transfer lines

In this article, the main factors which influence transmission efficiency of the SSRF electron beam trans- fer lines are described, including physical requirements for magnet system, vacuum system, beam diagnostic system, trajectory correction system, etc. The dynamic simulation calculation and transmission efficiency analysis of the SSRF electron beam transfer lines are presented, and the studies show that the design purpose of efficient beam transmission and injection will be achieved.

The transfer line design for the HEPS project

Purpose The high energy photon source(HEPS),a 6-GeV synchrotron radiation facility with ultralow emittance,is under construction in China.Three transfer lines are designed for HEPS.One low-energy transfer line is used to deliver the 500 MeV beam provided by the linac to the booster.Two high-energy transfer lines are used to connect the booster and the storage ring to realize beam accumulation in the booster at 6 GeV.Method The design of the transfer lines is closely related to the layout and optics design of the storage ring,booster and linac.Based on the physics design of the storage ring,booster and linac,the design of the transfer lines has been adjusted.Results and conclusion In this paper,the considerations and design of the latest lattice of transfer lines are described.The design satisfies the requirements of the high efficiency transmission and injection.

CONCURRENT PRODUCTION ENGINEERING SYSTEM FOR BUFFER SIZE AND FLEXIBLE TRANSFER LINE LAYOUT DESIGN

In this paper we propose a COncurrent Production Engineering System （COPES） for the flexible transfer line （FTL） layout design in a restricted area. COPES first determines the buffer size in front of the bay of each machine tool in the FTL and then initializes a computer aided design （CAD） system to draw the FTL in a restricted area. We develop a set of modules systems which have been integrated into a single framework, in accordance with the practice of concurrent engineering. Concurrent engineering involves the cooperation of these activities. It＇s expected that the developed COPES can improve the cooperation between production engineers＇ and the plant designer. This can be done by enabling the production engineers＇ to make better decision regarding FTL buffer size.

A Liability Division Method for Harmonic Pollution Based on Line-Transferred Power Components

The existing liability division methods for harmonic pollution are either inexplicit or incomplete in physical meaning. To compensate these defects, two new methods are proposed based on line-transferred power components in this paper. At first, all harmonic sources are represented by ideal equivalent current source, line current components and bus voltage components of a source are determined by stimulation of this source with all other sources disabled. Then, the line-trans- ferred power component owing to a source under all sources action together is determined by the theory of line-transferred power components, and called source’s line-transferred power component. At last, the liability of a source for line-end harmonic pollution is divided by two methods: the ration of the source’s line-transferred active power component to the total line-transferred power, and the ration of projection of the source’s line-transferred complex power component to absolute value of the total line-transferred complex power. These two methods are taken into account not only harmonic voltage but also harmonic current in the liability division. Simulation results show that the proposed liability division method based on active power component is the most effective and ideal one.

Forced Axial and Torsional Vibrations of a Shaft Line Using the Transfer Matrix Method Related to Solution Coefficients

这份现在的报纸处理对线性轴、扭力的颤动的数学描述。正常、正切的压力张肌部件在推进器和中间的柄由轴扭力的变丑和颤动生产了，在导致推进器的静电干扰的影响下面，可变水动力学刺激也被学习。与微分方程答案的经常的系数有关的转移矩阵方法被使用。当邻近的柄片断有一样的材料性质和直径时，作为与转移的一个著名方法相比，矩阵与州的向量联系了的后者的优点是减少乘的矩阵的数字的可能性。结果证明没有弄弯的风险并且证实轴线的强度取决于是应力张肌的最重要的部件的静态的正切的压力的价值。

Scheme for realizing quantum computation and quantum information transfer with superconducting qubits coupling to a 1D transmission line resonator

This paper proposes a simple scheme for realizing one-qubit and two-qubit quantum gates as well as multiqubit entanglement based on de-SQUID charge qubits through the control of their coupling to a 1D transmission line resonator （TLR）. The TLR behaves effectively as a quantum data-bus mode of a harmonic oscillator, which has several practical advantages including strong coupling strength, reproducibility, immunity to 1/f noise, and suppressed spontaneous emission. In this protocol, the data-bus does not need to stay adiabatically in its ground state, which results in not only fast quantum operation, hut also high-fidelity quantum information processing. Also, it elaborates the transfer process with the 1D transmission line.

轴向柱塞泵热特性及热力学建模实验研究

针对轴向柱塞泵在高压和高速工况下发热过快的问题,对柱塞泵热特性和热力学建模进行了仿真分析与实验研究。首先,在摩擦副发热理论基础上,考虑了泵内油液搅动摩擦与轴承摩擦发热源,研究了柱塞泵内发热机理和传热分析的热特性理论;然后,根据柱塞泵部件复杂和固流态域区分度高的特点,阐述了所采用的控制体积法原理,将泵划分为5个控制体积后,建立了以各个控制体温度变化为导向的热力学模型;最后,采用光纤光栅温度传感器和蓝牙无线温度传感器,针对不同的控制体节点设计了传感器封装结构和布置方法,共同组成了轴向柱塞泵在线热监测系统,并进行了在不同压力条件下的对照实验,对理论模型进行了有效性验证与分析。研究结果表明:对比实验和仿真结果,模型温度变化与实际误差值在5%左右,验证了该模型能准确地反映和预测泵热力学变化过程。该结果为柱塞泵热力学状态监测提供了故障诊断基础,并为液压系统热管理系统设计提供了理论基础和设计依据。

低频导波检测技术在输油场站应用的效果分析

本文主要是对低频导波检测技术原理和应用进行分析,进而选取本次最优开挖验证点,通过MsS长距离超声导波检测仪在姬塬外输总站管网腐蚀检测过程中的应用效果分析,判断其应用效果具有哪些局限性和优缺点,为后续输油场站常规检测工作提供参考依据。

基于近红外光谱模型转移的牛奶蛋白检测方法研究

目的研究基于近红外光谱模型转移的牛奶蛋白检测方法。方法分别采用实验室与在线检测近红外光谱仪采集生产过程中原料奶样品的近红外光谱,研究斜率截距法(slope/bias,S/B)、分段直接标准化(piecewise direct standardization,PDS)算法、Shenk’s方法在不同仪器测量光谱之间模型转移应用,优化模型参数,提高实验室仪器建立的校正模型应用于在线光谱仪器的预测精度。结果经过Shenk’s算法转移,主从机的光谱平均差异降低为0.0075,光谱校正率达到98.95%。利用模型转移方法与偏最小二乘模型结合,将实验室分析光谱仪建立的模型用于生产在线光谱仪测量光谱预测,显著提高了牛奶中蛋白质含量预测准确度,不同仪器之间模型预测相对均方根误差从5.52%下降到2.03%。结论本研究的方法实现了实验室分析与在线检测仪器测量光谱及定量分析模型转移共享,为近红外在线检测的智能化改进提供了基础。

基于域自适应迁移学习的有源配电网故障选线方法

基于数据驱动的人工智能模型,特别是卷积神经网络在配电网故障诊断领域取得了优异的表现。然而卷积神经网络严重依赖海量数据,模型性能会因数据量的减少而严重下降。为此,提出了一种基于域自适应迁移学习的有源配电网故障选线方法。首先,构造了一种嵌套注意力机制的卷积神经网络,提取有源配电网暂态零序电流的故障特征。然后,采用域自适应迁移学习方法,利用最大均值差异函数降低源域和目标域数据之间的分布差异,有效解决少样本故障选线问题。最后,在Matlab/Simulink中搭建不同运行方式的有源配电网对所提方法进行测试验证。结果表明,所提方法可在少样本情况下实现高精度、鲁棒性的有源配电网故障馈线识别。

飞机机载线槽结构对电磁防护性能的影响研究

针对雷击环境下,飞机机载平台内的线束易受到连接设备及外部辐射源的复杂电磁干扰问题,考虑线槽不同结构对线槽防护性能的影响,基于三同轴法,结合Van Helvoort形状系数,推导出线槽转移阻抗从低频到高频状态下的理论表达式。进而建立含不同高宽比线槽防护仿真模型,研究不同形状、尺寸的线槽防护性能。最后建立复合材料机身内线槽的雷击电磁防护仿真模型,分析机身不同位置、不同形状线槽的防护作用,进一步验证了不同结构线槽防护性能的差异性。结果表明:高宽比每增加1/2,线槽屏蔽效能约增加5 dB,且有效保护区域逐渐扩大;随着与机身蒙皮间距增大,机身内部线缆感应电流线性减小;线槽密封性与防护性能成正比。

1000 kV输电线路耐张塔等电位带电作业电位转移电流计算

特高压输电线路等电位带电作业过程中会出现电弧放电,产生高幅值、高能量的脉冲电流,因此提出准确的转移电流计算方法对作业人员的安全防护具有重要意义。文中提出了基于电弧模型的电位转移电流计算方法,可对进入等电位的过程进行模拟。基于PSCAD平台建立了1000 kV输电线路耐张塔等电位带电作业电位转移电流计算模型,同时分析了进入等电位的方式及速度对转移电流的影响。仿真与实测结果基本一致,表明该计算模型能够有效反映电位转移电流的动态变化特性。采用软梯法获得的转移电流峰值更小,提高进入等电位速度,可有效降低电位转移电流幅值。

基于格拉姆角场与ResNet的输电线路故障辨识方法

针对如何利用实际故障录波数据,提取和放大故障特征差异,开展故障类型与故障原因辨识的问题,提出了基于格拉姆角场与迁移学习-ResNet的输电线路故障辨识方法。首先,统计分析了输电线路故障类型和故障原因的分布特征,用于指导构建适用于类不平衡问题的故障分类器。然后,利用格拉姆角场变换将采集得到的故障电压、电流时序信号转化为格拉姆角场图像,放大故障特征差异,作为故障分类器的输入。进一步,将生成的图像集输入搭建好的故障分类器进行网络训练和测试,输出输电线路故障类型和故障原因。最后,完全采用真实故障录波数据开展了算例分析。结果表明:所提方法对故障类型的辨识准确率达到了97.51%,对故障原因的辨识准确率达到了94.23%。并且将训练的故障辨识网络迁移至其他地区时,仍然具有较好的故障辨识效果和泛化性能。所提方法为基于暂态波形数据驱动的故障辨识提供了新方法,可以用于实际电网的输电线路故障辨识。

深度潜水仪用HDI板金属化槽掩孔技术研究

该类型PCB产品主要应用于深度潜水仪设备,常规潜水仪设备下潜深度一般为50米,该产品经过特殊设计可满足水下150米的深度摄像,此类产品需要设计金属化包边制作且线宽线距≤50μm/50μm,因此按现有常规加工技术无法满足此类型产品的加工要求。本文主要采取对加工工艺及加工流程创新优化,既能满足精细线路加工,亦能显著提升金属化槽的掩孔能力,从而满足深度潜水仪金属化槽HDI板的批量化生产。