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一、引言簧片阀是指条状、舌簧状、圆环形和马蹄形等柔性自弹阀片组成的气阀,它广泛应用于微型空气压缩机和小型制冷压缩机。在压缩机簧片阀的数学模拟和工程设计计算中,将气阀当成一个节流元件来处理。通过 相似文献
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可靠性是压缩机气阀最主要的要求之一。影响气阀可靠性的因素很多,如压缩机气阀的结构参数影响阀片的撞击速度和应力;阀片的材质和制造工艺影响疲劳强度等。就目前的技术水平而言,气阀的结构参数基本上已能做到设计合理。由于阀片的材质受到材料冶炼部门的限制,所以制造工艺就成为提高气阀可靠性的主要问题。它不仅直接影响阀片的使用寿命,而且涉及到制造成本。例如,冲制阀片的生产率高,制造成本低,国内的网状阀片也曾使用过冲制工艺,但实际使用中寿命都很低。不少人认为冲制毛坯边缘存在微观裂纹,又缺少合适 相似文献
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提出对活塞式压缩机环状阀片瞬态应力的测量方法。并对阀片在工作状态下的应力水平进行了分析,为气阀的设计及提高阀片的使用寿命提供了实验依据。 相似文献
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The objectives of this study were to analytically and experimentally investigate the motion of the floating valve plate in an axial piston pump under various operating conditions. To achieve the objectives of the analytical investigation, the equations of motion for the valve plate were coupled with a time-dependent lubrication model. The balance pistons that support the floating valve plate were represented by equivalent spring and dashpot systems. The system of equations was then solved using the Runge-Kutta and the control volume finite difference methods to determine the pressure, film thickness, and motion of the valve plate for various operating conditions. To achieve the experimental objectives, a previously developed axial piston pump test rig was instrumented with proximity probes to measure the motion of the valve plate. The stiffness and damping of the balance pistons supporting the floating valve plate were determined using the impact and frequency response methods. Using the experimentally determined stiffness and damping coefficients in the coupled dynamic lubrication model, the analytical and experimental results of the valve plate motions were compared. The model was then used to conduct a parametric study to determine the overall system stiffness and damping coefficients during pump operation. Using the stiffness and damping coefficients from the parametric study in the dynamic lubrication model, the pressure, film thickness, and motion of the valve plate were calculated for various operating conditions. The experimental and analytical displacements of the valve plate were then corroborated and found to be in good agreement. 相似文献
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Experimental and Analytical Investigation of Floating Valve Plate Motion in an Axial Piston Pump 总被引:1,自引:0,他引:1
The purpose of this investigation was to experimentally measure the motion of the floating valve plate in an axial piston pump under various operating conditions and to develop a model to determine how the floating valve plate motion affected the lubricating pressures between the valve plate and cylinder block. In order to achieve the objectives, a hydraulic circuit was designed and developed to incorporate and operate a floating valve plate axial piston pump. The hydraulic circuit integrating the axial piston pump (axial piston pump apparatus, APPA) consists of a series of valves, pressure sensors, a charge pump, flow meters, temperature sensors, a heat exchanger, and proximity probes. The floating valve plate axial piston pump housing was modified to incorporate three proximity probes to measure the valve plate position and motion relative to the cylinder block, thus allowing for determination of the film thickness within this contact. The results illustrate that as the pump starts up the valve plate experiences vibrations and begins to lift relative to the cylinder block. Then as the pump reaches steady-state operation the valve plate achieves a fixed position and tilt. The results also demonstrate that under steady-state operation, the valve plate vibrates and this vibration correlates well with the speed and the number of pistons in the pump. The measured film thickness results were then used in a lubrication model to determine the pressures generated between the floating valve plate and the cylinder block. The analytical results highlight how the motion of the valve plate directly correlates to the pressure pulsations seen in the lubricating gap. 相似文献
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首先,采用脉冲响应衰减法测试了敷设阻尼薄板的阻尼损耗因子,分析了阻尼敷设比例及薄板的悬挂状态对薄板阻尼损耗因子的影响;其次,在混响-全消室中测试了敷设阻尼薄板的隔声量,比较了不同阻尼敷设比例薄板的测试结果;最后,建立了敷设阻尼薄板隔声量计算分析模型,隔声量计算值与试验值吻合较好,验证了计算模型的有效性。研究了敷设阻尼材料厚度与敷设比例对薄板结构隔声性能的影响,综合考虑轻量化和隔声性能,分析了阻尼材料厚度与敷设比例对薄板降噪效率的影响,并以降噪效率最大为目标进行了薄板隔声特性的优化。 相似文献
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为减小薄壁加筋结构在动态环境下的振动,提出了加筋肋布局和阻尼层拓扑一体化设计方法。以含表层阻尼材料的薄壁加筋板结构为研究对象,结合阻尼材料惩罚模型与基结构优化方法,引入筋条密度和阻尼单元密度两类独立设计变量,考虑筋条和阻尼材料的体积约束,建立最小化动态柔度的阻尼材料拓扑和筋条布局的协同优化模型,实现面向动态响应最小化的含阻尼层的薄壁加筋结构最优设计。通过不同阻尼、不同频率下的含表面阻尼层加筋板的多个数值算例,验证了所提方法和模型的有效性。 相似文献