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采用机理分析与统计分析相结合的方法,对对硝基苯胺生产过程进行了调优,得出了“变温操作”的结论。反应过程的保温时间缩短了20%,产品质量稳定。在不增加设备的情况下,每年可增加产量48.5吨。 相似文献
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《Calphad》2017
The Au-Ni nanoparticles (NPs) were prepared by oleylamine solvothermal synthesis from metal precursors. The Au-Ni phase diagram prediction respecting the particle size was calculated by the CALPHAD method. The hydrodynamic size of the AuNi NPs in a nonpolar organic solvent was measured by the dynamic light scattering (DLS) method. The average hydrodynamic sizes of the nanoparticle samples were between 18 and 25 nm. The metallic composition of the AuNi NP samples was obtained by inductively-coupled plasma atomic emission spectroscopy (ICP-OES). The metallic fraction inside AuNi NPs was varied Au-(30–70) wt%Ni. The steric alkylamine stabilization was observed. The individual AuNi NPs were investigated by transmission electron microscopy (TEM). The dry nanopowder was also studied. The structures of the aggregated samples were investigated by scanning electron microscopy (SEM). The AuNi NPs reveal randomly mixed face-centered cubic (FCC) crystal lattices. The phase transformations were studied under inert gas and air. The samples were studied by differential scanning calorimetry (DSC). 相似文献
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Simulation of partially observed Markov decision process and dynamic quality improvement 总被引:1,自引:0,他引:1
Computer simulation is used to compare three quality policies. The first policy is ‘do-nothing’. The second is an appraisal policy. The third policy includes prevention that leads to process quality improvement. The simulation model is based on a Partially Observed Markov Decision Process (POMDP). The unobserved states of the process depend on the failure rate, λ. The observed process output is the number of conforming and nonconforming products. The process performance is measured by quality costs per unit. The simulation language used is SLAM II. The power of using computer simulation to model the dynamics of process quality improvement is discussed. 相似文献
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基于ALE方法分析楔形体入水问题,楔形体采用拉格朗日网格离散,空气和水采用ALE网格离散。将楔形体视为刚体,空气和水的力学行为分别采用Gamma定律和GRUNEISEN状态方程模拟。讨论ALE流固耦合关键字中罚函数罚因子的取值方法,提出相应的建议原则;分析水域截断边界对楔形体响应的影响,给出模拟无限水域的截断边界位置的建议值;分析楔形体表面压力振荡的原因,提出楔形体表面压力获取方法。通过试验结果对比分析,验证方法的合理性。 相似文献
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分析了可视化仿真在车间规划方面的研究现状,指出了可视化仿真的优势。介绍了ProModel可视化仿真技术,并对建模步骤给予说明。最后运用ProModel对车间规划问题进行仿真,分析了仿真结果并提出了改进方案。 相似文献
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介绍基于WEB的网络型应用系统,将电能质量的在线监测与技术监督有机结合,建立电能质量数据中心及供电企业内部查询系统,对电网整体电能质量进行评估,仿真分析,提出整治建议,实现科学、有效地治理电网谐波污染。 相似文献
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The present paper deals with the variational approach for solving a clamped rectangular plate under a uniform load. The increasing use of composite materials for plate-type structures intensified the need for solutions of rectangular plates. The variational approach has a broad range of applications in solid mechanics. The methods used to solve the problem consider the minimum total potential energy approach. The maximum deflection is obtained for a square plate by the Ritz, Galerkin and Kantorovich methods. The aim of this paper is to find an approximate solution of higher accuracy. Numerical results for various components of stresses are found and plotted in the form of curves. The results obtained by various methods are compared with those reported earlier. The results show reasonable agreement with the known results, but with a simple and practical approach. The physical aspect of the concept is the immediate use of these results in solid and structural mechanics. 相似文献
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The problem of optimum control of a distributed parameter system with boundary control is studied. The distributed parameter system considered is described by theN -dimensional wave equation. The error measure is quadratic. The control function is unconstrained. The Riccati equation for optimum boundary control is derived. Methods for solving the Riccati equation and calculating optimum control are discussed. The resulting control is closed loop. 相似文献
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基于采样数据的线性变换,提出了一种曲线变形的思想;设计一种以Lagrange插值为基础的曲线变形算法,并进行算法复杂度分析。该方法能实现代数曲线间的变形处理,具有普遍的适用性和较高的计算精度。通过给出数值实例,验证了算法的有效性和可行性,该算法提供了曲线变形的一种有效途径。 相似文献
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介绍了一种微机配料控制系统是在现有多种微机配料控制系统的基础上,采用了微机配料集散控制方式,它是由一台主机和多台从机通过网络联结起来,主机将控制任务交给各个从机完成。整个微机配料系统分为工业控制计算机和配料控制器。工业控制计算机采用了ADVANTECH610型计算机;微机配料控制系统软件使用汇编和VB6.0编程,进行了相关软件的设计。 相似文献
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讨论了交—交变频调速系统故障诊断的重要性,在当前的检测方法与故障诊断手段研究的基础上,提出了基于DSP和小波分析的变频调速系统故障诊断方法,建立了故障诊断系统;采用了基于小波能量的机电设备状态检测方法,充分利用了DSP强大的数据处理功能,以及小波分析所具有的对非平稳信号的分析处理能力和多分辨力的特性;建立了交—交变频调速系统的数学模型。经仿真实验证明:该方法适用于变频调速系统的故障诊断。 相似文献
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A design sensitivity analysis for the transient response of the non-viscously damped dynamic systems is presented. The non-viscously (viscoelastically) damped system is widely used in structural vibration control. The damping forces in the system depend on the past history of motion via convolution integrals. The non-viscos damping is modeled by the generalized Maxwell model. The transient response is calculated with the implicit Newmark time integration scheme. The design sensitivity analysis method of the history dependent system is developed using the adjoint variable method. The discretize-then-differentiate approach is adopted for deriving discrete adjoint equations. The accuracy and the consistency of the proposed method are demonstrated through a single dof system. The proposed method is also applied to a multi-dof system. The validity and accuracy of the sensitivities from the proposed method are confirmed by finite difference results. 相似文献
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介绍了扩频通信中抗窄带干扰的频域方法,对其中的关键技术门限检测和干扰处理技术进行了分析,研究了基于高斯分布的确定门限算法和基于指数分布的自适应门限检测算法,给出了算法流程,基于延迟重叠的FFT算法,建立了仿真模型,针对单音干扰、多音干扰、窄带干扰进行了仿真,仿真结果表明,自适应门限算法对各种干扰具有较强的适应性。 相似文献
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传统的塔板结构设计方法重复计算工作量大 ,设计质量不理想、效率低、周期长。本软件采用一种新方法负荷性能图法 ,提高了塔板结构设计的质量 ;缩短了设计周期。并采用动态数据库和面向对象的编程技术 ,应用可视化编程语言VisualBasic5 0开发板式塔塔板结构尺寸设计软件。软件可以脱离VisualBaisc5 0开发环境独立运行 ,界面友好、操作方便、运行可靠稳定 相似文献