环道离心机异常振动的仿真与试验研究

Simulation and Experimental Study of Abnormal Vibration Occurred in Loop Centrifuge

环道标准表法气体流量标准装置是国内首套采用环道式工艺,以天然气为介质的高准确度气体流量标准装置,其中的环道离心机是输送天然气的重要动力装置。在其处于某些工况工作过程中发现离心机的振动烈度超过了安全值4 mm/s。为探究造成离心机异常振动的原因并加以解决,针对该状况对离心机进行仿真与实验研究,模态分析结果显示,固有频率在838、1120、1373、1377、1387及1678 Hz处变形较大,通过实验与谐响应分析结果对比显示,在1.5 MPa,2800 r/min的工况下,离心机的振动放大来源于频率为831、1106、1347和1650 Hz的气体扰动;在1.8 MPa,2600 r/min的工况下离心机的振动放大来源于频率为831、1117、1393和1674 Hz的气体扰动。在离心机底座中心位置添加加强筋,测点的振动能量最大值从4.26降低到2.08,极大地减小了离心机的振动状况。

The loop standard meter method gas flow standard device is the first domestic high-accuracy gas flow standard device that uses a loop type process and uses natural gas as the medium.The loop centrifuge is an important power device for natural gas transportation.It was found that the vibration intensity of the centrifuge exceeded the safe value of 4mm/s during its work under certain conditions.In order to explore the cause of the abnormal vibration of the centrifuge and solve it,the centrifuge was simulated and experimentally studied for this situation.The modal analysis results showed that the natural frequencies of 838,1120,1373,1377,1387 and 1678 Hz deformed greatly.Through the comparison of experimental and harmonic response analysis results,under the working conditions of 1.5 MPa,2800 r/min,the vibration amplification of the centrifuge comes from gas disturbances with frequencies of 831,1106,1347 and 1650 Hz;at 1.8 MPa,2600 r/min The vibration amplification of the centrifuge under the working condition of,comes from the gas disturbance with frequencies of 831,1117,1393 and 1674 Hz.By adding stiffeners at the center of the centrifuge base,the maximum vibration energy of the measuring point is reduced from 4.26 to 2.08,which greatly reduces the vibration condition of the centrifuge.