双轴

Motibity changed by gear-box in direction and rotate speed is transferred to the blade axis on the right side to drive the blade axis. blade axis'parameter, blade assembling frame and blade assembling means are ascertained. The load and movement of the blade axis are analyzed. And the best blade rotate speed is ascertained. According to the request of no-tillage soil, the appropriate furrow openers are chosen. They are staggered and assembled in two rows .According to the sliding cutting request, the crucial parts of the anti-blocking——the sliding cutting blade, its edge curve is analyzed and designed in principle. The academic curve function is gotten. Combined with working practice and technics request, the blade's figuration parameter is designed, 65Mn is chosen as the material for blades. The working load is analyzed. And the intension of the sliding cutting is analyzed and checked with ANSYS software. At last, the spring rack of the suppress wheal is analyzed in principle. The theory and parameter of designing the spring rack of the suppress wheal. Experiment indicated that the anti-blocking capability of this anti-blocking equipment was excellent.

设计出适合此防堵装置的动力传输方案，动力经变速箱变向变速后从右侧传给刀轴，驱使刀片切割秸秆；确定出了刀轴的参数、刀片的安装结构和安装方法，对刀轴的受力和运动进行了分析，确定出了刀轴最佳转速；根据免耕地的要求，选择恰当的开沟器，并采用双排错位安装的办法，避免了"瓶颈"现象的发生；根据滑切的要求对此防堵装置的关键部件——滑切刀片的刃口曲线进行了理论分析和设计，得到了刀刃的理论曲线方程；结合生产实践及工艺要求，设计出刀片的外形参数，选择65Mn作为刀片的材料；分析和计算了刀片在工作中承受的载荷，运用ANSYS 软件对滑切刀片的强度进行了分析校核；最后对镇压轮的弹簧支架结构进行了理论分析，提出了设计镇压轮弹簧支架的理论和参数依据。

First, the angular velocity function and maneuver load for certain maneuver flight (including hover, dive-hike and these two combined) are set up. The simulation results of the vibration of double-disk rotor system with cantilever supported on rigid bearings show that rotor would be apparently deformed under maneuver load. Second, the performance of oil force of SFD in maneuver flight is analyzed. The results show that in maneuver flight, the SFD with centering spring will become eccentric and its oil force will be time-related and offset-related. Then, SFDs are introduced into typical Jeffcott rotor system. The whole system will be statically displaced in maneuver flight and the nonsynchronous components of oil force appear in the response of rotor system.

首先，建立了水平盘旋、俯冲拉起及盘旋+俯冲拉起复合机动三种机动飞行条件下的机动角速度函数，并确定了对应机动飞行条件下的机动附加载荷(附加离心力和附加陀螺力矩)，分析了带刚支的双盘悬臂转子系统在机动飞行条件下的振动特性，发现发动机转子在机动飞行时会发生明显变形；随后，分析了非定心挤压油膜阻尼器的油膜力特性，机动飞行时，油膜轴颈在机动附加载荷的作用下偏离外环中心，使得带定心弹支的挤压油膜阻尼器也变成了非定心挤压油膜阻尼器，其非定心挤压油膜力是瞬态时变的，并且与SFD油膜轴颈偏移量和进动形态有关；然后，在经典的Jeffcott转子系统中引入带定心弹支的挤压油膜阻尼器，分析了机动飞行时非线性转子系统的振动特性，发现挤压油膜阻尼器油膜力的非协调特性也反映到转子系统的振动响应中；之后，对机动飞行条件下带挤压油膜阻尼器的双盘悬臂转子系统的振动特性进行了分析，并重点分析、总结了俯冲拉起机动飞行时，系统结构参数和工作状态参数(转速比、机动飞行半径、机动角速度等)对该系统振动特性的影响。

After analyzing the numerical simulation results of the impeller blade with different scale, and comparing the flow field distributing, then one kind of double-head anti-unsymmetrical S mode airfoils is found which is suitable to the normal and the reversed blowing for double directions under the design operating condition and which can also satisfy the requirement for the reversible axial flow fan in subway.

分析缩放比例不同的可逆式轴流风机叶型的数值模拟结果，比较各种叶型的流场分布规律，寻找到一种适合于设计工况下正、反双向吹风的双头双机翼反向不对称S型叶型，能够满足地铁用可逆轴流风机的要求。

Consequences of the rotation of DNA are illustrated in Figure 9.17 in the twin domain model for transcription. As RNA polymerase pushes forward along the double helix, it generates positive supercoils ahead and leaves negative supercoils behind. For each

超螺旋与转录还有更多的关系，RNA聚合酶转录DNA时，解链和复链同时也发生，如同Fig113中所示，这需要整个转录复合体绕DNA旋转或者DNA自己绕它的双链轴旋转，DNA旋转的后果如Fig11.19所示，图中是一个转录的双结构域模型，当RNA聚合酶沿DNA前移时，在酶前产生正双螺旋，酶后为负的双螺旋；每一个双螺旋转角被RNA跨越后都会在前面产生+1转角，后面产生-1转角。

Number of loaded circuits DN Value Preload Method for Providing a Preload Applied preload 1row 2.50 turns 70000 Yes fixed point preload 4055 Type of guide Shaft process method Ball cage Splined portion Hollow shaft Ball Precision None None None Recommended support unit on the Fixed Side type Recommended support unit on the Supported Side type Types of Nuts Threading direction Spacer ball None None Double-nut Right-hand, left-handmust be check...

载荷钢球圈列数 DN值预压预压方法预压负荷 3列 2.50圈 70000 有定位置预压 4545 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球无无双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 16 81.1 231.3 14.61 20.85 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with...

载荷钢球圈列数 DN值预压预压方法预压负荷 2列 2.50圈 70000 有定位置预压 4370 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球无无双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 6 29 99 3.42 11.31 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ atta...

载荷钢球圈列数 DN值预压预压方法预压负荷 1row 2.50圈 70000 有定位置预压 765 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球 BK30，FK30 BF30， FF30 双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 10 52.7 141.1 6.16 8.22 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ...

载荷钢球圈列数 DN值预压预压方法预压负荷 2列 2.50圈 70000 有定位置预压 3080 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球 BK30，FK30 BF30， FF30 双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 12 33.9 79.2 5.42 8.12 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ...

载荷钢球圈列数 DN值预压预压方法预压负荷 1row 3.50圈 70000 有定位置预压 1940 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球 BK30，FK30 BF30， FF30 双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 8 39.1 132.3 5.08 14.0 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ...

载荷钢球圈列数 DN值预压预压方法预压负荷 1row 2.50圈 70000 有定位置预压 695 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球 BK20，EK20，FK20 BF20， EF20， FF20 双螺帽右螺纹，左螺纹，左右螺纹无轴。。。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。