CAJ | 학술논문

基于显式动力分析软件ANSYS/LS-DYNA,建立了摇臂式喷头摇臂绕轴旋转、碰撞喷体的有限元分析模型,在3种摇臂转动角速度和喷体安装弹性橡胶垫与否的组合工况下,对摇臂与喷体的碰撞过程及动应力分布进行了计算模拟.结果表明,PY_140型摇臂式喷头在转动角速度400(°)/s时,计算的碰撞动应力峰值为42.3 MPa,与试验值的误差小于0.5%,预测的发生位置距离摇臂转轴中心15 cm,与试验结果相同.摇臂各断面的动应力极值和碰撞接触应力均随转动角速度的增加而增大,喷体打击块安装橡胶垫后,3种转动角速度下动应力峰值平均降低了10.4%,但接触时间平均增加了76.6%.
기우현식동력분석연건ANSYS/LS-DYNA,건립료요비식분두요비요축선전、팽당분체적유한원분석모형,재3충요비전동각속도화분체안장탄성상효점여부적조합공황하,대요비여분체적팽당과정급동응력분포진행료계산모의.결과표명,PY_140형요비식분두재전동각속도400(°)/s시,계산적팽당동응력봉치위42.3 MPa,여시험치적오차소우0.5%,예측적발생위치거리요비전축중심15 cm,여시험결과상동.요비각단면적동응력겁치화팽당접촉응력균수전동각속도적증가이증대,분체타격괴안장상효점후,3충전동각속도하동응력봉치평균강저료10.4%,단접촉시간평균증가료76.6%.
As one of the key parts of the impact sprinkler, the swing arm is exerted by complex dynamic stress in the impact process. Based on the dynamic explicit software ANSYS/LS-DYNA, a finite-element model for simulating the rotation of swing arm around the axis and the impact between the swing arm and the sprinkler body was established. Several cases under three rotational angular velocities and with or without the rubber pad fixed on the sprinkler body's contact stop were investigated. The results indicate that under the angular velocity of 400(°)/s, the simulated peak dynamic stress of PY_140 impact sprinkler was 42.3 MPa, with an error less than 0.5% compared with the measured result. The predicted peak dynamic stress was located offset 15 cm from the centerline of the swing arm's rotation axis, which was the same as the measured data. The extreme dynamic stresses of different cross sections and contact stresses increased with the increase of the rotational angular velocity. After fixing the rubber pad, the peak dynamic stress had an average decrease of 10.4% under three angular velocities, while the contact time had an average increase of 76.6%.