液压驱动双曲肘斜排列七支点合模机构的分析研究

双曲肘斜排列七支点合模机构是一种创新的注射机合模机构,液压驱动系统根据肘杆机构的特性进行设计,两者之间相辅相成使机构的性能进一步提高。研究了机构的运动学、力学的性能,分析了机构运行性能与液压驱动性能之间的关系,提出了机构的机械和液压的主要技术参数的理论计算和设计准则,并通过实例验证了设计理论计算和公式的可行性,为机构的开发和应用提供了理论基础和工程设计方法。实例研究表明,双曲肘斜排列七支点合模机构同比双曲肘斜排列五支点合模机构,行程比大于一倍,液压驱动节能35%,系统液压驱动装载功率下降40%。     

基于ADAMS的注塑机合模机构动力学仿真研究

基于多体系统动力学理论和机械系统动力学仿真分析软件ADAMS,建立了注塑机双曲肘合模机构的虚拟样机模型,并应用刚柔耦合动力学模型对合模机构进行了柔体动力学的仿真分析,仿真的结果符合实际情况,表明基于ADAMS进行注塑机双曲肘合模机构动力学仿真分析研究的可行性。     

基于Pro/E的注塑机双曲肘合模装置设计

简述了Pro/E软件在注塑机液压双曲肘合模机构设计中的运用,并对其设计过程及方法进行了概括,说明了软件设计及运动仿真的辅助功能在液压双曲肘合模装置设计中的作用。     

双曲肘合模机构的多目标优化设计

分析了双曲肘合模机构的运动特性和力学特性,采用多目标模拟退火优化算法MOSA(MultiObject Simulated Annealing),基于多目标优化平台modeFRONTIER,以合模油缸推力和机构总长度为目标函数建立多目标优化设计模型,对双曲肘合模机构的关键结构参数进行多目标优化计算.结果表明,优化后合模油...     

注塑机双肘杆锁模机构的优化设计

推导了双曲肘合模机构行程比和力的放大比与肘杆尺寸及肘杆轴线夹角的关系公式,并应用MATLAB优化模块探讨了肘杆机构的尺寸优化问题.所取得的满意解明显优于现行设计.为实际工程设计方案的选择提供了依据.     

用MathCAD对注射机增力机构进行优化设计

对注射机五铰链斜排双曲肘增力机构进行了运动和力学特性分析,用MathCAD时增力机构进行了优化设计,并验证优化结果具有鲁棒性。     

技术文摘专栏

七支点合模机构及其液压驱动的两者互联关系的分析设计 【摘要】：双曲肘斜排列七支点合模机构是一种创新发明的新颖的合模机构,液压驱动系统基于肘杆机构的特性进行设计,两者之间相辅相成使机构的性能得到进一步提高。研究了液压驱动系统与机构的运动学、力学的性能之间的关系,     

基于MATLAB软件GUI技术的双曲肘合模机构优化程序设计

通过对双曲肘合模机构详细的理论分析,提取出该机构设计过程中所涉及的主要变量和目标优化函数,基于Matlab软件的GUI技术开发了图形化的优化设计程序,有效提高了合模机构参数优化的效率。     

液压驱动双曲肘斜排列七支点合模机构的分析研究(续)

双曲肘斜排列七支点合模机构是一种创新的注射机合模机构,液压驱动系统根据肘杆机构的特性进行设计,两者之间相辅相成使机构的性能进一步提高.研究了机构的运动学、力学的性能,分析了机构运行性能与液压驱动性能之间的关系,提出了机构的机械和液压的主要技术参数的理论计算和设计准则,并通过实例验证了设计理论计算和公式的可行性,为机构的...     

七支点合模机构及其液压驱动的系统的分析及设计的研究

双曲肘斜排列七支点合模机构是一种创新发明的新颖的合模机构,液压驱动系统基于肘杆机构的特性进行设计,两者之间相辅相成使机构的性能得到进一步提高.研究了液压驱动系统与机构的运动学、力学的性能之间的关系,提出了液压驱动系统的主要技术参数的计算理论和设计准则,并通过实例验证了设计计算理论和公式的可行性,为机构的开发和应用提供了理论基础和工程设计方法.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.     

Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking

This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern...     

奥氏体不锈钢表面双辉等离子渗锆的动力学

利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013)cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。     

气化炉三维扫描测量与数据处理

以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可.