共查询到18条相似文献,搜索用时 171 毫秒
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分析了海水液压柱塞泵配流阀的结构形式、主要部件的参数计算和运动规律。结合海水介质的理化特性,讨论了配流阀的材料选择。 相似文献
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针对高速液压泵的研制过程中,配流阀响应频率与泵转速的匹配问题,对柱塞泵系统的流量特性、配流阀滞后问题及结构优化进行了研究。通过阀芯力平衡方程,建立了配流阀动力学模型,基于经典控制理论,通过求解力平衡方程确定了系统传递函数,并对其时间响应进行了验证;在理论分析的基础上,应用AMESim软件,分析了高速阀配流系统的动态流量特性,研究了锥阀和球阀两种阀芯结构以及泵转速对系统动态特性的影响。研究结果表明:随着泵转速的提高,系统回流明显,使容积效率明显下降;锥阀更适合高速阀配流系统,同时在锥阀底部设置阻尼孔,可明显减缓阀芯对阀座的冲击力,提高阀座的使用寿命。 相似文献
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针对一种新型十字摆盘驱动式水液压轴向柱塞泵的配流阀系统结构参数与泵转速、柱塞直径不匹配导致的容积效率不足的问题,搭建了该新型泵的ADAMS-AMESim固液耦合仿真模型。在额定转速下,分析了配流阀阀芯质量、弹簧刚度、弹簧预紧力、阀芯球面直径对其容积效率的影响,并对其配流系统进行优化设计。结果表明:新型泵的容积效率随着配流阀弹簧刚度、预紧力的增加而增加,随着配流阀阀芯质量、阀芯球面直径的增加而减少,且吸液阀结构参数的变化对容积效率影响大于排液阀。因此,在设计新型泵的配流阀时可适当提高阀芯复位弹簧刚度和预紧力,适当减小阀芯质量和阀芯球面直径,以提高新型泵的容积效率。 相似文献
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液压约束活塞发动机是一种新型液压动力系统,配流阀系统是其中不可缺少的重要元件。对配流系统进行最优化设计,可大幅度地缩短系统设计周期,改善设计方案,从而达到提高整机产品质量的目的。基于最优化技术,采用对容积效率和阀的寿命线性加权的方法,得出了总目标函数,建立液压约束活塞发动机配流系统的优化模型。通过Matlab语言程序对其进行优化设计,对优化数学模型进行求解。对优化前后的结果进行分析,优化后吸入阀和排出阀的冲击力分别下降了48.77%和44.50%,优化后的容积效率提高了10.06%。计算结果表明,所采用的算法是可行的、有效的。对此系统的出水阀压力和流量随转速、油门的变化关系进行试验研究,将试验结果与仿真结果进行对比,仿真结果与试验结果非常接近,误差在6%以内。从而验证了液压约束活塞发动机阀式配流系统优化模型的正确性与精确性。 相似文献
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液压泵作为液压型风力发电传动系统中一个重要元件,其输出流量特性直接影响发电质量。针对传统液压泵在低速下流量特性不佳状况,提出一种曲轴连杆式应用阀配流的新型风能吸功泵。文章介绍了风能吸功泵结构及工作原理,并在其基础上建立其流量数学模型,借助Matlab软件分析风能吸功泵流量特性,其仿真结果与样机试验测试结果进行对比,最后重点分析配流阀相对活塞运动产生的滞后角对风能吸功泵流量特性的影响。分析结果可知,当配流阀阀芯直径减小、弹簧刚度增大以及转速减小时,风能吸功泵配流阀滞后角减小,流量脉动也随之减小。 相似文献
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《Machining Science and Technology》2013,17(3):349-360
The process of water jet cutting has advantages over laser beam cutting, especially in the case of temperature‐sensitive materials. Together with the foam and cellulose material processing, the processing of composite materials of lightweight structures is becoming more and more important. In order to meet given requirements, these sandwich constructions can have various types of cover layers (defined by e.g., sheet thickness and material) and consist of core materials (differing e.g., in geometry or in structure). Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM‐systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy‐logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy‐logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献
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超声切割技术作为快速发展的加工工艺,越来越广泛地应用于复合材料的加工,尤其是以纸蜂窝材料为代表的弱刚度复合材料。开展了超声切割铝蜂窝试验研究,通过分析不同振幅、不同进给速度下的切割力、超声切割后蜂窝工件的宏观和微观形貌,验证了超声切割铝蜂窝的可行性和优势。试验结果显示,超声切割后蜂窝宏观结构无明显破坏,无明显毛刺毛边产生,提高超声振幅和进给速度可以改善蜂窝切割后微观表面形貌;刀具的超声振动可以显著减小切割力,且在相同进给速度下随着超声振幅的提高,切割力变小;在相同超声振幅下随着进给速度的提高,切割力变大,但变化幅度较小。通过对超声切割铝蜂窝过程的受力分析,讨论了超声振幅、进给速度的变化对切割力的影响规律,并与试验结果进行对比,从理论上分析了造成超声切割力规律性变化的内在原因。 相似文献
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针对高深宽比非导电硬脆材料(如石英玻璃和陶瓷)微结构的加工需求,对微细电解电火花切割加工方法进行了深入研究。首先,提出了使用旋转螺旋微工具电极的电化学放电切割方法,并对切割缝宽模型进行了讨论;其次,对旋转螺旋电极电解电火花切割加工工艺进行了深入的试验研究,试验研究了加工电压、脉冲频率、占空比和主轴转速这些关键工艺参数对切割加工精度的影响。实验结果表明,缝宽随着施加电压和占空比的增加而增加,随着频率、主轴转速和进给速率的增加而减小。最后,通过优化后的参数成功加工出缝宽为135μm的微缝阵列、复杂的封闭微结构以及深宽比达6∶1的微图形结构。由此表明该方法是一种可有效加工高深宽比绝缘硬脆材料微结构的新工艺。 相似文献
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The process of water jet cutting has advantages over laser beam cutting, especially in the case of temperature-sensitive materials. Together with the foam and cellulose material processing, the processing of composite materials of lightweight structures is becoming more and more important. In order to meet given requirements, these sandwich constructions can have various types of cover layers (defined by e.g., sheet thickness and material) and consist of core materials (differing e.g., in geometry or in structure).
Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM-systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy-logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy-logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献
Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM-systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy-logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy-logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献
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