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根据预期技术指标,确定燃油炉喷嘴类型为简单离心式喷嘴。使用经验公式法,选取经验系数,对喷嘴的几何参数进行计算与校核,根据几何参数分析雾化效果。结果表明:喷嘴直径,稳定段长度,旋流室直径,喷嘴内锥角,切向槽数目为个、宽度、深度,能够符合喷嘴流量、喷雾锥角及雾化效果的需求,适用于该燃油炉。 相似文献
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由于清洗器喷嘴几何尺寸相对较小,传统的扇形喷嘴结构对车灯的清洗效果不理想。根据车灯清洗要求,研制了一种实现重点清洗和辅助清洗功能相结合的新型喷嘴。并采用数值分析方法对其进行了仿真研究,应用VOF方法对喷嘴内部流场和外部雾化特性方面进行了气液两相流动计算,仿真结果表明新型喷嘴能够获得较大的雾化角,具有较大的轴向和径向动量,提高清洗效果。并与实验结果做了比较,二者吻合较好,为此方法应用到喷嘴设计提供了依据。 相似文献
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设计了一种新型带电水;中洗设备喷头机构,结构紧凑、使用方便,解决了防静电、防水等防护问题,并成功运用于生产实践,极大地提高了喷头运动的灵活性和可靠性。 相似文献
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介绍一种不需要EPROM和DAC芯片的数字化正弦波发生电路,产生的正弦波失真度低,频率和幅度稳定,调节方便,具有较高性价比。 相似文献
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The utility model is related to an injection- molding machine for wood-plastic composite materials, it features: including screw extruder, storage device and mould device; the exit of screw extruder is connected with storage device and the exit of storage device is connected with molds of mould device. 相似文献
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Metallic foams are a class of porous materials widely used in the industry because of their advantages. In recent years, extensive studies on the behavior of these materials have been conducted. Several constitutive equations have also been presented and applied. This study proposes a new constitutive equation that predicts metallic foam behavior using the stress–strain curve in uniaxial compression. The proposed model offers a new functionality for work hardening and is evaluated for both isotropic and combined hardening. The constitutive equations are implemented in MATLAB and integrated using return mapping algorithm. The material parameters are identified using genetic algorithm and through a comparison of the experimental and numerical results. The aluminum foams discussed in this paper are the commercially available types, Foaminal and Alporas. The comparison of numerical and experimental results indicate that this new constitutive equation predicts foam behavior in a reasonable manner. Moreover, a good agreement is observed between the experimental and computational curves. 相似文献
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新型并联机床的固有特性研究 总被引:5,自引:0,他引:5
新型并联机是空间多环机构在数控机床不上的应用,本文建立了该机庆的弹性动力学有限元模型,并确定了机床的结构参数种典型的加工轨迹,经过有限元实例计算得到了机床一阶有频率变化曲线,通过对计算结果的分析得出机床固有频率随机床结构参数和刀头姿态变化的规律。本文的研究对在机床设计阶段提高机床的动力学性能具有重要意义。 相似文献
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针对经典SVM对于样本噪声敏感的局限性问题,在经典SVM基础上,引入主成分分析(PCA)方法,提出一种改进SVM新方法-PSVM。这种新的机器学习方法,既利用了PCA降噪的特性,又具有经典SVM泛化能力强、分类快的特性。改善了经典SVM的鲁棒性。应用小波包分析对信号进行预处理,直接得到特征矢量,并作为PSVM的输入,提出满足实时性要求的分类模型WPSVM。通过实例分析,证明这种方法在分类正确率、分类速度以及适用的样本规模等方面都表现出了一定的优越性。 相似文献
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通过分析分组修配法的特点,提出了先通过设计计算将修配件进行更合理分组,再利用分组修配法进行装配的一种机器装配工艺新方法。此装配方法可将修配量控制在理想的范围内,既保证了精度,又提高了效率。 相似文献
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Sandro Turchetta Wilma Polini Giorgio Gelfusa Enrico Venafro 《The International Journal of Advanced Manufacturing Technology》2014,70(1-4):73-78
Diamond wire is widely used for stone cutting; it is typically employed to extract a block in quarry and to square the block in a machining company. In particular, the frames to square or to cut the blocks present many technological limits, such as the high costs of the diamond wire, the frequent break of the diamond wire during cutting, the poor quality of cut surfaces, and the dangerous process and productivity lower than that of the same tool used in a quarry. The present work shows an innovative prototype machine to cut by a diamond wire which overcomes the aforementioned technological limits. The developed machine has a bridge frame among which two pulleys move the diamond wire as regards the stone block according with the feed speed. The diamond wire moves on the two pulleys with a cutting speed. A tensile force is applied to the wire that twists it during the contact with the stone, instead of keeping it along a straight direction parallel to the foundation of the machine. The twisting of the diamond wire makes the use of the wire itself more productive and safer, since the wear of each single bead during cutting is more uniform. Moreover, the resulting specific pressure acts on each bead along the arc of contact with the cut block and increases along the cutting direction from the entrance to the exit of the contact with the stone. The increasing of the specific pressure causes a bending of the diamond wire during the contact with the stone. The developed prototype was provided with a sensory system to measure both the cutting power and the tensile force of the diamond wire during experimental tests. In this way it was possible to verify the functionality of the prototype plant and, in the same time, to evaluate the productivity of the implemented cutting process. 相似文献
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