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Through analysis of the hydraulic shock produced in the course of reversing of the reversing valve used in the cylinder pump circuit pump, the paper shows that this hydraulic shock in the return oil pipe in the hydraulic cylinder is the result from the mutual effect due to the oil inertial force and the loading inertia force.

通过对泵—缸式液压回路在换向阀换向时产生的液压冲击的分析，表明液压缸回油管路中的液压冲击是由油液的惯性力和负载的惯性力共同作用的结果，在此基础上提出了液压缸回油管路中液压冲击的增压压力计算公式，结果可为液压系统和管路的防振减噪设计提供参考。

Compared with the results of simulation of spring backstop and hydraulic cylinder backstop, using of hydraulic cylinder backstop depletes more effectively the vibration and impact of the crawler crane boom backward tipping than the spring backstop.

比较弹簧式和液压缸式防后倾装置的仿真结果，采用液压缸式防后倾装置比弹簧式防后倾装置能更为有效地消减臂架后倾时的振动和冲击。

The hydraulic system model of the hydraulic cylinder backstop, which in general used on the large-tonnage crawler crane, is established by ADAMS/Hydraulics module. And the joint simulation between the mechanical system and the hydraulic system of the crawler crane virtual prototyping is implemented. The different effect of the spring backstop and hydraulic cylinder backstop for the crawler crane boom backward tipping is analysed and compared.

对目前大吨位履带起重机普遍采用的液压缸式防后倾装置，用ADAMS/Hydraulics模块构建该装置的液压系统模型，实现履带起重机虚拟样机模型机械、液压系统的联合仿真，并分析比较了弹簧式和液压缸式两种防后倾装置对臂架后倾的影响。

The company is casting for the integration and processing enterprises, is the multi-cylinder diesel engine vehicles, gear room, a room covered gear, cylinder head covers professional production enterprises, strong technical force, well-equipped.

本公司是铸造与加工为一体化企业，是车用多缸柴油机、齿轮室、齿轮室盖、气缸盖罩的专业生产企业，技术力量雄厚，设备精良。

In order to analyze the relationship between radiation heat transfer and thermo-efficiency, the radiant heat flux of the cylinder and thermal balance are measured. The results show that: The reduction of thermal radiant flux in the cylinder is the primary cause of the improvement of thermal efficiency of the engine.

为了研究发动机热效率和辐射传热量变化之间的关系，利用辐射传感器测量了柴油机燃用DMC柴油混合燃料后缸内辐射传热量，进行了热平衡实验，分析结果表明，添加含氧燃料后，发动机缸内辐射传热量的减少是导致其有效热效率的提高的主要原因。

The stable winding equations of the elbow torus and cylinder are established according to different geometry, and the winding pattern of the geodesics of torus and semi-geodesics of cylinder are also achieved.

根据微分几何建立弯管的圆环面及圆柱面稳定缠绕方程，给出了圆环面的测地线缠绕解及圆柱面的半测地线缠绕解，并提出了用OpenGL及VC++对所设计的线型进行仿真的具体实现办法。

The non-uniform flow behind a rigid cylinder row with a small pitch ratio T/D= 1.5 is characterized by narrow and wide near wakes and multiple frequencies, and the vortex shedding behind a rigid cylinder row with T/D= 2.0 is replicated properly by the simulation results.

此外，还研究了单列自由振动的弹性圆柱在间隙比为2.0时的流体诱导振动问题，结果表明：在大振幅条件下，流体诱导力在x方向和y方向有较强烈的耦合；随着振幅的减小，x方向振动对y方向振动的影响可以忽略，可采用单自由度的动力学模型假设进行计算。

The non-uniform flow behind a rigid cylinder row with a small pitch ratio T/D=1.5 is characterized by narrow and wide near wakes and multiple frequencies, and the vortex shedding behind a rigid cylinder row with T/D=2.0 is replicated properly by the simulation results.

计算模拟结果很好地重现了刚性单列圆柱在小间隙比(1.5)下以宽、窄尾涡交替和多频为特征的非均匀流态，以及间隙比为2.0时的涡脱落现象。

A, Pneumatic: air cleaner, air pipe, the direction valve, cylinder, vacuum equipment, pneumatic instrumentation, pneumatic connectors, cylinder seals.

a、气动：空气洁净、空气管道、方向阀、气缸、真空设备、气动仪表、气动接头、气缸密封件。

A rotary two-stroke engine including a multi-cylinder block rotatably mounted on two main bearings within an engine housing, a crankshaft journalled for rotation within said main bearings, indirectly geared at a ratio of 2:1 to said cylinder block and piston members connected to said crankshaft which induce gas through ports in said cylinders via side entry tracts in said engine housing, being sealed by rotating seal rings.

一种旋转二冲程发动机，包括一个多缸机体、一个曲轴和活塞组件，其中该多缸机体可旋转地安装在发动机机体中的两个主轴承之中，曲轴支承在所说主轴承中旋转，并以2∶1的传动比间接地与所说汽缸体啮合，而活塞组件与所说曲轴连接，活塞从所说汽缸中的气口处经所说发动机上的所说进气通道将燃气吸入，该通道被旋转的密封环密封。

The medicinal plant resources of Gentianaceae in Sichuan Province.

四川省龙胆科药用植物资源。

"Some fortuneteller," scoffed the man, I'm the father of THREE children.

" "一些算命"，嘲笑他，"我的父亲有三个孩子。