第94章 五天假,不是五年假吗?
第94章五天假,不是五年假吗?(第1/2页)
省城开往东川的客运班车最终停靠在东川工业大学侧门外的长途站牌旁。
宋文山拎着那只沉甸甸的军绿色帆布包,下了车。
包里除了几件换洗衬衫,全是硬邦邦的铁件与油印纸抄件。
五天的探亲假转眼即逝,他的鞋檐上还沾着764厂门口的黄泥。
走进机械工程系实验楼。
二楼小型低空作业平台课题组的门虚掩着,里面传出计算尺抽拉的唰唰声与几名青年教师、研究生的争论。
“宋老师!您可算回来了!”
一名留着分头的年轻助教抬头看见宋文山,眼睛一亮,连忙丢下手中的卡尺迎上来,
“您这趟探亲顺利吧?知微在山沟里一切都好?”
宋文山把帆布包往木质实验台上一放,发出“当”的一声闷响。
“闺女见到了,精神很好,现在在764厂里带检验组呢。”
宋文山解开棉大衣扣子,指着帆布包笑了笑,
“不过我探亲这几天,咱们课题组的进度怎么样啦,我在764厂找到解决方案了!”
几名正趴在图纸上的研究生闻声都围了过来。
课题组组内两名青年教师也放下了手中的手稿。
三个月来,这个由东川工大机械系主导的《小型低空遥控作业平台机械稳定》课题,一直死死卡在125CC单缸两冲程发动机逼近三千转时的强振区。
原有的理论推导全部指向“连杆局部刚度不足”,课题组先后换了三种厚度的连杆材料,甚至尝试过加厚锻造,但只要转速一过二千九百转,台架上的百分表依然疯狂甩动,舵机连杆失步严重。
“宋老师,您这是?”
助教好奇地拉开帆布包拉链,手往里一摸,摸出了一根表面带着锉刀打磨痕迹的旧连杆,以及厚厚一叠带着复写纸墨迹的抄件。
助教拿起那根旧连杆,看了看端头的磨痕,眉头微微皱起:
“这是?工艺看着挺糙啊,连表面淬火的色泽都不均匀。
宋老师,这东西是什么?”
隔壁课题组的刘讲师走过来,拿过那几页手绘的测试曲线抄件看了两眼,禁不住失笑道:
“老宋,你这五天假期没休好啊,怎么把三线厂的工装台账带回来了?
这上面又是‘对称斜撑’又是‘发动机座受力点微调’的,连个有限元受力分析图都没有,纯靠老师傅手工焊上去的?”
宋文山环视众人,
“这是764厂研发中心在没有现成仿真软件的条件下,用半个小时抓住根因、两次复测全部通过的工程实测记录。
我亲手操纵的遥控器,亲眼看着转速表稳定拉过三千转。”
刘讲师愣了一下,
“老宋,764厂的测试台架跟咱们系里的标准台架能一样吗?”
“用咱们系里的台架再试一次。”
宋文山拔出胸前钢笔,在课题组的排班表上直接划了一道,
“我拿我的教授声誉押这次复现。实践是检验真理的唯一标准。”
半小时后,机械系小型动力台架实验室里响起了一阵低沉的轰鸣。
一架同型号的125CC单缸发动机被刚性固定在标准铁槽座上,四周连接着多通道百分表与光电转速传感器。
几名学生拿着记录板站在防爆栅栏外,刘讲师和助教则守在控制台旁。
“油门准备,升速!”
宋文山按着台架扶手,眼神凝重。
发动机转速快速攀升,一千五百转、两千转、两千五百转……
当转速表指针划过二千八百转,逼近两千九百五十转的瞬间,整个铁槽台架猛地剧烈抖动起来!
嗡!
防爆栅栏上的有机玻璃窗发出刺耳的共振频率声,百分表的指针如同狂乱的机械舞者,在刻度盘上剧烈甩动,越过了安全红线!
“停机!快停机!”
助教惊呼一声,连忙伸手去按紧急断电按钮。
发动机带着喘息声缓缓慢了下来。台架周围一片死寂,几名学生互相对视了一眼,露出了“果然如此”的表情。
(本章未完,请点击下一页继续阅读)第94章五天假,不是五年假吗?(第2/2页)
刘讲师叹了一口气,拍了拍宋文山的肩膀:
“老宋,你看,我就说吧。手工焊的斜撑放在山沟工厂的旧台架上可能刚好把振动抵消了,换到咱们系的刚性台架上,峰值立刻偏移了。这根本没办法重复。”
掌控控制台的助教也低声道:
“宋老师,要不……咱们还是回过头来,继续推导连杆截面刚度吧?把764厂这个例子当成现场特殊工况记在附录里就行了。”
宋文山站在抖动的台架旁,脸色有些发白。
如果此时承认这只是“工厂巧合”,不仅能给课题组找个台阶下,也能保住他自己的学术颜面。
但他脑海里瞬间浮现出764厂那间旧试验楼里,陈砺站在台架旁冷静指出“发动机座受力点与骨架固有频率重合”的画面。
陈砺当时没有看任何复杂的公式,只凭对结构整体受力的洞察,就抓住了核心。
宋文山深吸了一口气,越过控制台,走到防爆栅栏内,蹲下身子仔细拆解台架上的固定夹具。
“刘讲师,你看这里。”
宋文山指着被死死用螺栓锁在槽钢上的发动机底部,
“咱们犯了和课题组前三个月一样的错误!咱们一直把发动机当成独立的振动源,把连杆当成唯一的受力体,所以死死把底座封固在槽钢上。但764厂的方案不是单改连杆,他们的思路是‘发动机座—骨架—连杆’的系统解法!”
他抬头看向助教和几名学生:
“把底座刚性螺栓卸掉两根,加垫厚橡胶减震垫!
把连杆上的配重块按照抄件上的位置移动三毫米!
按照764厂的对称斜撑布置,重新架设支撑梁!”
学生们面面相觑,但在宋文山严厉的眼神下,助教还是迅速拿来了扳手和橡胶垫。
机械系最优秀的几名研究生重新爬上台架。
按照陈砺在手绘图纸上标注的尺寸,重新调整发动机座固定点,在薄壁钢管骨架两侧加装了两根呈三十度夹角的手工斜撑,并将连杆上的配重螺母精准定位在第三刻度。
十五分钟后,台架重新装夹完毕。
“第二轮测试,启动!”
宋文山亲自合上了电源开关。
发动机再次轰鸣起来,蓝色的排气烟雾在排风管道口被抽走。
转速表指针快速拉升:
两千转……两千五百转……两千八百转!
先前出现剧烈共振的两千九百五十转关口到了!
整个实验室里的人瞬间屏住了呼吸。
转速表指针没有半点卡顿,横跨过二千九百五十转,直冲三千转大关!
三千转!
三千两百转!
三千五百转!
防爆栅栏上的有机玻璃安静如初,百分表的指针在刻度盘上微微抖动,连杆顺畅地在曲轴带动下高速运转,没有任何失步与卡滞!
“过了!真的过了!三千五百转稳定!”
负责读数的学生忍不住高声欢呼起来,用力在记录板上重重打了个钩!
助教呆呆地看着光电转速表上稳定的数字,又看了看那两根看似粗糙却刚好卡在振动节点上的斜撑,嘴唇张了张,半天没说出话来。
刘讲师几步跨到台架前,拿起百分表反复核对数据,随后转过头盯着宋文山,眼里充满了震撼:
“老宋……这……这真的是一个三线山沟工厂调出来的?”
宋文山解开手套,指着实验台上的记录本,
“现在,你们还觉得这是偶然巧合吗?”
实验室里鸦雀无声。
此前所有的怀疑与轻视,在稳定的三千五百转曲线面前荡然无存。
“我收回刚才的话。”
刘讲师看着宋文山,郑重道,“这个方案边界清晰、重复性极高。这不是巧合,这是一份出色的现场工程实践方案。”
周围的学生们爆出一阵掌声。
助教激动的拿过抄件,开始擦掉原先黑板上只盯连杆刚度的推导公式,重新按照系统振动阻尼的思路画出新的受力框图。
一秒记住【顶点小说】
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