第322章 提前评估流程(二合一)
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江河过来,对方推开门。
走进去后,第一眼看到的便是一张长会议桌以及坐着的八位老师。
贺教授、梁教授都在,另外五位分管理论、实验、英文材料等等模块。
会议室后方架着两台摄像机,桌面中央摆着录音设备。
侧面的显示屏已经连上线,屏幕里有将近十位远程旁听的专家。
这些人里,有物理学会竞赛委员会的专家和往届IPHO国家队领队,都是圈内德高望重的专家人物。
他们属于本次评估组,以线上形式参与,有权提出各种问题。
若最终结果通过,现场录像、答题记录、会议纪要都会一并进入备案材料。
画面右下角亮着物理学会会议系统的标识。
整体透着一种庄严肃穆的感觉,光是看着便能给人带来一股无形压力。
陆铭脸色淡然,毫无惧色。
他在鸟巢打过KPL总决赛,被无数镜头对准过,也曾受到过数万人的同时注视。
于他而言,在这里只是换了一种赛场规则。
秦江河示意他在桌前坐下,开口道:“今天是提前综合评估流程。”
“评估内容包括综合建模、英文材料阅读、实验设计说明、口头答辩四个部分。”
“全程录像录音,答题纸、草稿纸、会议纪要都会存档,评估结束后,教练组和专家组会根据前几天的诊断材料和今天的表现讨论结果。”
“你不用紧张,按平时状态来就好。”
“明白。”陆铭轻轻点头。
时间来到八点半,秦江河在主位坐下:“开始吧。”
第一份材料被递到陆铭面前。
英文背景,装置示意图,参数表,三组实验数据,还有一段故意写得简略的理论描述。
题目研究的是一个微型磁悬浮振子系统。
系统受到周期电磁驱动、空气阻尼、热漂移、传感器延迟的共同影响,需要在有限数据下判断稳定区间,并给出可用的近似模型。
看完后,陆铭知道这次的评估难度有多高了。
这也正合他意。
他在草稿纸上画出四个框,分别填上驱动、阻尼、热漂移、测量延迟。
再用箭头把四个框连在一起,在传感器延迟旁边画了一个圈。
不到两分钟,他写下第一行判断:传感器延迟会伪装成相位滞后,若直接拟合,会高估等效阻尼。
线上一位白发专家认真看向陆铭的草稿纸投影画面。
这是这道题最容易掉进去的坑。
很多学生会直接拿相位滞后来推阻尼系数,曲线能拟合得很好,最后模型含义全错。
陆铭开头第一刀,正好切在陷阱上。
秦江河眼底多了几分笑意。
他知道,陆铭进入状态了。
静静看他表演吧。
接下来的十几分钟,陆铭把系统拆成两个时间尺度。
快变量对应振子位移和速度,慢变量对应热漂移和传感器零点变化。
驱动项先取一阶近似,阻尼项保留速度相关项,热漂移单独作为慢变参数进入修正。
每加一个项,他都会在旁边标注适用条件。
(本章未完,请点击下一页继续阅读)第322章提前评估流程(二合一)(第2/2页)
小振幅区、低温漂区、传感器延迟可校准区。
陆铭的草稿内容相当整洁漂亮,字迹清晰优美,看着有一种别样的美感。
不论是在场的教练组,亦或是线上观看的评估组,都不约而同地表现出赞赏之意。
仅仅这一个环节,便能看出陆铭的能力有多强了。
写到稳定性条件时,秦江河忽然问道:“如果驱动幅度继续增大,你这个线性化结论还能用吗?”
陆铭头也没抬地回道:“局部还能用,整体不能用。”
他顺手在原式旁边写下一项二阶修正。
“高振幅下,驱动项会把系统推到非线性区。稳定边界向低频方向移动,分岔点提前出现。这个时候不能用单一稳定区间描述,要分振幅层级。”
贺教授追问:“怎么验证?”
陆铭继续道:“先做低振幅扫频,拿基准曲线,再逐步增大驱动幅度,观察峰值偏移和谐波分量。如果二次谐波和三次谐波开始明显抬升,就说明线性模型失效。”
一位远程专家开口问道:“如果传感器延迟本身也随温度漂移呢?”
会议室里几位老师都看向陆铭,这个问题问得不错。
陆铭当即在测量延迟旁边补了一条温度函数。
“延迟项不能再视作常数,要写成温度的慢变函数。先用空载数据标定延迟随温度变化的基准曲线,再把它从主模型里扣掉。”
“如果扣除后残差仍然和温度相关,说明热漂移和传感器延迟没有完全分离,需要增加独立温度探
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