摘要：Axial piston pumps have been widely used in aircraft hydraulic systems to supply the system with pressurized fluid. The continuous improvement of the aircraft performance has put forward the demand on aviation piston pumps for high power density, safety, and reliability. The lubricating interfaces in axial piston machines are the key design issue that greatly determines the pump performance and service life. The cylinder block/valve plate interface is one of these critical lubricating interfaces and has received considerable attention from many researchers in the last half century. This study aims to review the state-of-the-art literature on the cylinder block/valve plate interface comprehensively and systematically. First, we introduce various theoretical models developed to investigate the lubrication behaviors of the interface and compare them in terms of their assumptions and limitations. Second, the experimental studies on the cylinder block/valve plate interface are presented comprehensively, where the involved test rigs are divided into three types according to their fidelity levels and measurement functionality. Third, we summarize some typical approaches of structure optimization, surface shaping, and surface strengthening, which help improve the load-carrying and anti-wear capacities of the interface under severe operating conditions. Finally, the challenges and future trends of the cylinder block/valve plate interface research are discussed briefly.

摘要：The power density of axial piston pumps can benefit greatly from increased rotational ***,the maximum rotational speed of axial piston machines is limited by the cavitation phenomenon for a given volumetric *** paper presents a scaling law derived from an analytical cavitation model to estimate the speed limitations for the same series of axial piston *** cavitation model is experimentally verified using a high-speed axial piston pump,and the scaling law is validated with open specification data in product *** show that the speed limitation is approximately proportional to the square root of the inlet pressure and inversely proportional to the cube root of volumetric ***,a characteristic constant is defined based on the presented scaling *** constant can represent the comprehensive capacity of axial piston pumps free from cavitation.

摘要：流量脉动是轴向柱塞泵输出油液时的固有属性,其诱发的压力脉动直接影响柱塞泵及整个液压系统的工作品质和服役寿命。为阐明轴向柱塞泵流量脉动成因和成分,建立了轴向柱塞泵三维瞬态CFD仿真模型,搭建了轴向柱塞泵出口压力脉动测试平台,验证了仿真模型的有效性。通过调整仿真模型的几何结构参数,解耦出柱塞泵流量脉动中的几何脉动、倒灌脉动、泄漏脉动和死区脉动分量,仿真分析了不同工况下各脉动分量对柱塞泵总流量脉动的幅值贡献率。结果表明,几何脉动和倒灌脉动加剧出口流量脉动,而死区脉动和泄漏脉动抑制出口流量脉动。在出口压力10 MPa和转速1000 r/min工况下,几何脉动和倒灌脉动对出口流量脉动的贡献率分别为9%和214%,死区脉动和泄漏脉动对出口流量脉动的贡献率分别为-35%和-88%。研究结果为轴向柱塞泵出口流量脉动的形成机理及抑制方法提供了重要理论依据。

摘要：为了能有效地拓宽压气机的失稳裕度,在一台跨声轴流压气机上进行了基于介质阻挡放电(DBD)等离子体激励扩稳的实验研究.实验中分别选取了正弦交流电源和纳秒脉冲电源提供激励,并在跨声压气机40%设计转速和65%设计转速下对其扩稳效果和效率进行了对比分析.结果表明:在40%设计转速时,正弦交流电源和纳秒脉冲电源均能有效拓宽压气机流量范围,其中正弦交流电源激励方式能够使压气机综合失速裕度改善(SMI)达到15.33%.在65%设计转速时,两种激励方式的扩稳效果明显减弱,此时纳秒脉冲电源激励方式的扩稳效果更好.在压气机效率方面,纳秒脉冲电源对压气机设计点的效率影响更小,在40%设计转速时甚至能略微提升其设计点效率.实验结果表明,合理地选择激励方式有助于提高等离子体激励的扩稳效果,为实际压气机中基于介质阻挡放电等离子体激励扩稳措施的设计提供参考.

摘要：针对随机事件驱动的网络化控制系统,研究其中的有限时域和无限时域内最优控制器的设计问题.首先,根据执行器介质访问机制将网络化控制系统建模为具有多个状态的马尔科夫跳变系统;然后,基于动态规划和马尔科夫跳变线性系统理论设计满足二次型性能指标的最优控制序列,通过求解耦合黎卡提方程的镇定解,给出最优控制律的计算方法,使得网络化控制系统均方指数稳定;最后,通过仿真实验表明了所提出方法的有效性.

摘要：Seven cyclohexane-bearing C-glucoside derivatives（7,9,12,13 and 17-19） were designed and synthesized as SGLT2 inhibitors starting from a potent SGLT2 inhibitor we discovered in earlier work, （lS）-1-deoxy-l-[4-methoxy-3-（trans-n-propylcyclohexyl）methylphenyl]-D-glucose（1）.The in vitro and in vivo biological activities were evaluated by hSGLT2/hSGLTl inhibition and urinary glucose excretion （UGE）,*** the synthesized compounds 12,the 6-deoxy derivative of 1 was the most active and selective SGLT2 inhibitor（IC_（50）= 1.4nmol/L against hSGLT2;selectivity = 1576）.Compound 12 was a potent SGLT2 inhibitor,which could induce more urinary glucose than 1 and dapagliflozin in UGE.

摘要：导引头的抗干扰性能通常是通过地面实验来验证的。为了尽可能地仿真实际的干扰环境,需要研制大量的干扰设备和相应的仿真设备。而战场上的干扰环境又千变万化,技术发展十分迅速,这就要求仿真设备不断更新,极大地增加了研制周期和成本。探讨了导引头抗干扰的数字仿真技术,使抗干扰性能得到定量的评估。讨论了非成像光电寻的导引头的抗干扰数字仿真。

摘要：本文对某涡扇发动机风扇-外涵道-内涵道整体进行三维定常数值模拟,对内外涵道在设计转速下的流量特性和非设计工况下的气动性能进行了分析。得到内外涵道的稳定工作区域以及在内外涵道堵塞和近失速点的流场信息,为风扇／增压级整体结构的性能评估和优化设计提供了一定的依据。

摘要：目的探索传统吉祥纹样在新中式家具设计中的运用方法。方法从平面装饰、造型、功能和传统纹样的立体转化4个方面展开,研究了传统吉祥纹样在新中式家具设计中的创新方法,阐述了传统纹样在新中式家具设计中的应用细节,并结合具体的设计实例进行验证。结论传统吉祥纹样是我国传统文化的缩影,家具是技术与艺术的统一。将传统吉祥纹样与新中式家具相结合,不能照搬与模仿传统纹样,必须进行纹样的再设计,才能达到新中式家具的创新设计,更加直观、形象地表现我国传统文化,进一步推动家具设计的发展。

摘要：运用三维粘性流体分析技术,通过改变导叶和静叶角度的方式,对压气机在设计转速和非设计工况下的流动损失和失速裕度进行了分析,目的是研究在导叶和多级静叶安装角匹配时,压气机效率和稳定变化的趋势和特征,结果表明:导叶/静叶联调与压气机转速的变化有一定的对应关系,这一规律的探索,为实际运行的自适应调节方案设计提供了基本准则.