第293章 故障排除
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第293章故障排除(第1/2页)
仿真结果打印出来时,天已经大亮。
赵四把厚厚一沓纸摊在桌上。
最上面是特征值分析结果,下面是他手绘的振型示意图。
那些线条很简略,轮盘画成圆圈,叶片画成短线,振动形态用波浪线表示,但核心信息一目了然:
第四阶模态,148.6HZ,轮盘四边形变形耦合叶片弯曲。
陈启明醒来后第一个冲进机房,眼睛还带着睡意,但看见那些图纸立刻清醒了。
“赵总工,这是……”
“初步结果。”
赵四指着148.6HZ那行,“和试验数据对得上。”
“问题应该就在这里。”
“轮盘的刚度分布不均匀,在某个特定频率下会形成四边形变形,这个变形带动叶片一起振动。”
年轻人凑近了看,手指顺着示意图的线条移动:
“所以……要解决这个问题,要么改变轮盘的刚度分布,让它不容易形成四边形变形;”
“要么调整叶片的安装方式,削弱耦合?”
“对。”赵四点头。
“但改变轮盘刚度意味着重新设计,模具要重做,加工工艺要调整,周期太长。”
“我们时间不够。”
“那叶片安装方式……”
“可以试试。”
赵四从抽屉里拿出轮盘的详细图纸。
“你看,现在叶片榫头是等间距安装,每个扇区60度。”
“如果我们把其中两个相对的扇区稍微调整一下,把榫头位置偏移0.5度,破坏四重对称性,也许就能打破这个耦合模态。”
陈启明眼睛亮了:“这个改动小,只需要调整加工夹具,不影响轮盘本体结构。”
“但是……0.5度够吗?”
“先试试。”
赵四说,“今天上午咱们就做计算,把修改后的模型重新算一遍,看固有频率怎么变化。”
团队陆续到齐。
赵四把任务分配下去。
林雪修改网格模型,把两个相对扇区的节点坐标偏移0.5度;
张卫东更新输入文件,重新运行特征值分析;
刘峰和王海准备理论分析,预测频率偏移的方向和大小。
修改很小,但工作量不小。
林雪花了两个小时重新计算所有节点的坐标,确保偏移后模型依然保持质量平衡。
张卫东调试程序时发现了一个小bUg,刚度矩阵的某个非对角项符号错了,修正后又花了半小时。
中午十二点,修改后的模型开始计算。
这一次大家没有离开,都守在机房。
计算机的嗡鸣声成了背景音,打印头每吐出一行结果,就有人凑过去看。
下午两点,特征值求解完成。
新的频率列出来:
第1阶:24.7HZ(不变)
第2阶:73.9HZ(基本不变)
第3阶:123.1HZ(略有上升)
第4阶:151.8HZ(上升了3.2HZ!)
第5阶:185.3HZ
第6阶:247.0HZ
“成功了!”
王海第一个喊出来,“第四阶频率上移了!”
“而且移动幅度很大,3.2HZ,这足以避开叶片的通过频率范围!”
赵四盯着那个151.8HZ的数字,心里一块石头落地了。
频率上移,意味着这个模态被“推”到了更高的频段。
在发动机的工作转速范围内,激振频率(叶片的通过频率)很难达到这个值,共振风险大大降低。
但这只是理论计算。
实际效果如何,还得看实物改进后的试验结果。
“准备改进方案。”
赵四说,“把榫头位置偏移0.5度的具体加工方法写清楚,包括夹具调整量、加工步骤、检验标准。”
“今天下班前,我要看到完整的工艺文件。”
(本章未完,请点击下一页继续阅读)第293章故障排除(第2/2页)
“那现有的轮盘怎么办?”陈启明问,“已经加工好的那批……”
“全部返工。”
赵四说得很果断,“时间再紧,质量不能妥协。”
“通知加工车间,暂停新轮盘的加工,先集中力量返工已有的。”
“另外,把仿真结果和改进方案整理成报告,下午我向楚老汇报。”
楚怀远看到报告时,手有些抖。
不是因为激动,是因为疲惫。
这些天老人几乎没怎么睡,一直在协调各方资源,应对各种质疑。
振动问题像一块巨石压在所有人心上,现在,终于看到了搬开的希望。
“0.5度的偏移……”
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