Article(id=1228654097486770942, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228654089437901468, articleNumber=null, orderNo=null, doi=10.16385/j.cnki.issn.1004-4523.2024.12.010, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1690387200000, receivedDateStr=2023-07-27, revisedDate=1696867200000, revisedDateStr=2023-10-10, acceptedDate=null, acceptedDateStr=null, onlineDate=1770863564130, onlineDateStr=2026-02-12, pubDate=1735315200000, pubDateStr=2024-12-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1770863564130, onlineIssueDateStr=2026-02-12, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1770863564130, creator=13701087609, updateTime=1770863564130, updator=13701087609, issue=Issue{id=1228654089437901468, tenantId=1146029695717560320, journalId=1225147924628267009, year='2024', volume='37', issue='12', pageStart='1993', pageEnd='2167', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1770863562211, creator=13701087609, updateTime=1770863940325, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1228655675413299456, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228654089437901468, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1228655675413299457, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228654089437901468, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=2086, endPage=2092, ext={EN=ArticleExt(id=1228654097839092500, articleId=1228654097486770942, tenantId=1146029695717560320, journalId=1225147924628267009, language=EN, title=A hybrid structure adaptive vibration active control strategy, columnId=null, journalTitle=Journal of Vibration Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Aiming at the robustness and stability of the vibration active control of motor-driven seawater pumps,a hybrid structure adaptive vibration active control strategy is proposed based on the Kalman filter (KF) algorithm,which establishes the system state prediction equations,state transfer matrix and measurement matrix,and builds a hybrid structure adaptive vibration active control system model. In order to improve the convergence performance of the algorithm,an online update strategy for the measurement noise covariance matrix is proposed. Simulation results show that the new control strategy effectively overcomes the strong correlation between the reference signal and the vibration source based on the classical Filtered x Least Mean Square algorithm (“FxLMS”),and realizes effective vibration active control under the premise that Gaussian white noise is used as the reference signal. The robustness,stability,and control effect of the proposed strategy are all superior to that of the FxLMS algorithm with a variable step size. The results provide theoretical support for engineering practice and have certain potential application value.

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针对电机驱动海水泵振动有源控制的鲁棒性和稳定性问题,基于卡尔曼滤波(Kalman filter,KF)算法,提出一种混合结构自适应振动有源控制策略。建立了系统状态预测方程、状态转移矩阵及测量矩阵等,搭建了混合结构自适应振动有源控制系统模型。为提高算法的收敛性能,提出一种测量噪声协方差矩阵的在线更新策略。对多频激励下的频率突变、幅值突变进行仿真,仿真结果表明,所提控制策略可有效减弱参考信号与振动源信号的强相关性;实现了在高斯白噪声作为参考信号的前提下,振动有源控制仍然有效;鲁棒性、稳定性和控制效果均优于变步长FxLMS算法。

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刘学广(1973―),男,博士,教授。E-mail:
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杨玉良(1989—),男,博士研究生。电话:(0535)2607689;E-mail:

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label=Tab.1, caption=

Variables of the KF algorithm

, figureFileSmall=null, figureFileBig=null, tableContent=
变量释义维数
先验状态估计值,状态空间变量(滤波器权系数)L1
后验状态估计值,即最优估计L1
状态转移矩阵LL
后验估计协方差矩阵,表示后验状态估计值的不确定性LL
先验估计协方差矩阵,表示先验状态估计值的不确定性LL
滤波增益矩阵,也称卡尔曼系数L1
状态变量到量测量的转换矩阵1L
过程激励噪声协方差矩阵(系统过程的协方差)LL
测量噪声协方差矩阵11
), ArticleFig(id=1228654127622845264, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654097486770942, language=CN, label=表1, caption=

KF算法变量

, figureFileSmall=null, figureFileBig=null, tableContent=
变量释义维数
先验状态估计值,状态空间变量(滤波器权系数)L1
后验状态估计值,即最优估计L1
状态转移矩阵LL
后验估计协方差矩阵,表示后验状态估计值的不确定性LL
先验估计协方差矩阵,表示先验状态估计值的不确定性LL
滤波增益矩阵,也称卡尔曼系数L1
状态变量到量测量的转换矩阵1L
过程激励噪声协方差矩阵(系统过程的协方差)LL
测量噪声协方差矩阵11
), ArticleFig(id=1228654127710925651, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654097486770942, language=EN, label=Tab.2, caption=

The amount of computation for each algorithm in a single iteration

, figureFileSmall=null, figureFileBig=null, tableContent=
算法加法运算量乘法运算量
VSSFxLMS
前馈KF
混合KF
), ArticleFig(id=1228654127782228821, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654097486770942, language=CN, label=表2, caption=

单次迭代各算法的计算量

, figureFileSmall=null, figureFileBig=null, tableContent=
算法加法运算量乘法运算量
VSSFxLMS
前馈KF
混合KF
), ArticleFig(id=1228654127882892118, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654097486770942, language=EN, label=Tab.3, caption=

Numerical comparison of noise reduction performance(Unit: dB)

, figureFileSmall=null, figureFileBig=null, tableContent=
控制策略参考信号R振动源基频及倍频/Hz
4590135180
VSSFxLMS60 Hz0.01-0.02-0.05-0.04
前馈KF60 Hz-4.68-1.120.811.11
混合KF60 Hz-22.88-36.99-27.57-13.50
VSSFxLMSWGN-0.12-0.030.090.55
前馈KFWGN-0.08-0.61-0.38-0.18
混合KFWGN-21.56-32.33-25.01-13.42
), ArticleFig(id=1228654127975166810, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654097486770942, language=CN, label=表3, caption=

降噪性能数值对照(单位:dB)

, figureFileSmall=null, figureFileBig=null, tableContent=
控制策略参考信号R振动源基频及倍频/Hz
4590135180
VSSFxLMS60 Hz0.01-0.02-0.05-0.04
前馈KF60 Hz-4.68-1.120.811.11
混合KF60 Hz-22.88-36.99-27.57-13.50
VSSFxLMSWGN-0.12-0.030.090.55
前馈KFWGN-0.08-0.61-0.38-0.18
混合KFWGN-21.56-32.33-25.01-13.42
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一种混合结构自适应振动有源控制策略
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杨玉良 1 , 周俊成 2 , 刘学广 1 , 王岩岩 2 , 冯峰 2
振动工程学报 | 2024,37(12): 2086-2092
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振动工程学报 | 2024, 37(12): 2086-2092
一种混合结构自适应振动有源控制策略
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杨玉良1 , 周俊成2, 刘学广1 , 王岩岩2, 冯峰2
作者信息
  • 1哈尔滨工程大学动力与能源工程学院,黑龙江 哈尔滨 150001
  • 2哈尔滨工程大学烟台研究院,山东 烟台 264000
  • 杨玉良(1989—),男,博士研究生。电话:(0535)2607689;E-mail:

通讯作者:

刘学广(1973―),男,博士,教授。E-mail:
A hybrid structure adaptive vibration active control strategy
Yu-liang YANG1 , Jun-cheng ZHOU2, Xue-guang LIU1 , Yan-yan WANG2, feng FENG2
Affiliations
  • 1College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China
  • 2Yantai Research Institute,Harbin Engineering University,Yantai 264000,China
出版时间: 2024-12-28 doi: 10.16385/j.cnki.issn.1004-4523.2024.12.010
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针对电机驱动海水泵振动有源控制的鲁棒性和稳定性问题,基于卡尔曼滤波(Kalman filter,KF)算法,提出一种混合结构自适应振动有源控制策略。建立了系统状态预测方程、状态转移矩阵及测量矩阵等,搭建了混合结构自适应振动有源控制系统模型。为提高算法的收敛性能,提出一种测量噪声协方差矩阵的在线更新策略。对多频激励下的频率突变、幅值突变进行仿真,仿真结果表明,所提控制策略可有效减弱参考信号与振动源信号的强相关性;实现了在高斯白噪声作为参考信号的前提下,振动有源控制仍然有效;鲁棒性、稳定性和控制效果均优于变步长FxLMS算法。

振动有源控制  /  多频激励  /  卡尔曼滤波

Aiming at the robustness and stability of the vibration active control of motor-driven seawater pumps,a hybrid structure adaptive vibration active control strategy is proposed based on the Kalman filter (KF) algorithm,which establishes the system state prediction equations,state transfer matrix and measurement matrix,and builds a hybrid structure adaptive vibration active control system model. In order to improve the convergence performance of the algorithm,an online update strategy for the measurement noise covariance matrix is proposed. Simulation results show that the new control strategy effectively overcomes the strong correlation between the reference signal and the vibration source based on the classical Filtered x Least Mean Square algorithm (“FxLMS”),and realizes effective vibration active control under the premise that Gaussian white noise is used as the reference signal. The robustness,stability,and control effect of the proposed strategy are all superior to that of the FxLMS algorithm with a variable step size. The results provide theoretical support for engineering practice and have certain potential application value.

active vibration control  /  multi-frequency excitation  /  Kalman filter
杨玉良, 周俊成, 刘学广, 王岩岩, 冯峰. 一种混合结构自适应振动有源控制策略. 振动工程学报, 2024 , 37 (12) : 2086 -2092 . DOI: 10.16385/j.cnki.issn.1004-4523.2024.12.010
Yu-liang YANG, Jun-cheng ZHOU, Xue-guang LIU, Yan-yan WANG, feng FENG. A hybrid structure adaptive vibration active control strategy[J]. Journal of Vibration Engineering, 2024 , 37 (12) : 2086 -2092 . DOI: 10.16385/j.cnki.issn.1004-4523.2024.12.010
随着船舶/海洋平台等动力机械对低频振动控制的要求不断提高,关于低频振动控制策略的问题受到广泛关注1。低频振动控制主要采用有源控制(Active Vibration Control,AVC)的方式。振动有源控制系统主要由传感器、控制器、执行机构等组成。一般情况下,在船舶航行过程中动力设备启停及运转,以及传感器的精度和适应环境的能力等均会对振动有源控制系统造成影响。由于传感器老化、失效等原因,导致采集的参考信号与振动源信号产生偏差,会引起频率及幅值的突变,极易造成有源控制系统的失效。在AVC领域,经典的控制策略为滤波-x最小均方算法(简称FxLMS)。但FxLMS算法在处理多频激励源时,多采用并联结构调节步长,过度依赖参考信号的输入,致使算法的收敛性和鲁棒性较差2-4。减弱参考信号与初级振源之间的强相关性需求是提高振动有源控制效果的突破口之一。近年来,随着神经网络算法的兴起,有学者对其进行了探索,但由于计算量过大导致其很难在实际中广泛应用,而KF算法在处理动态系统中的噪声和不确定性方面表现出色,能够更精确地估计信号的状态。
梁清等5采用FxKalman算法对单频、窄带和宽带信号进行了仿真及实验研究,验证了其收敛速度优于FxLMS和FxRLS。王磊等6针对有源头靠噪声控制问题,采用前馈KF算法,有效提高算法的收敛速度并提升控制效果,同时提出了不确定性协方差矩阵的在线更新策略,降低了算法计算复杂度。
本文基于滤波理论和控制理论思想,结合KF算法,提出一种混合结构自适应振动有源控制策略,通过提高量测信息包含的信息量,用以减少引入噪声及后验估计对控制效果的影响。本研究提出的控制策略具有更好的控制效果及鲁棒性,将本文方法与变步长FxLMS算法(简称VSSFxLMS)进行比较,仿真表明,所提控制策略在收敛速度、控制效果及鲁棒性方面均优于经典算法,为减弱参考信号与初级振源的强相关性需求提供了有效途径,实现了对非平稳频率失调振动的有效抑制。
KF算法是根据贝叶斯估计推导得出的,是目前最接近贝叶斯滤波的次优滤波算法之一,其主要特点为:抗干扰能力强、可跟踪随机信号。考虑到影响KF算法准确性的关键因素之一是新息方程,即测量值与预测值的差值,因此新息方程包括的信息量越多、越准,对状态量的估计越准确7-9。在振动有源控制过程中只有误差信息包括了所有的信息量,因此在前馈算法的基础上,提出一种混合结构。
在最优估计过程中需重点构建以下矩阵方程及统计信息:状态预测方程、状态转移矩阵、测量矩阵、新息方程、过程噪声激励的统计特性、测量误差的统计特性等10-11。建立混合结构自适应AVC系统有三个关键点:一是选取误差信号真实值。在振动有源控制模型当中,误差信号包含了大量信息,以此为真实值,作为预测值的修正更接近实际,更容易收敛;二是建立输入信号与真实值的关系,即新息方程。控制器的输入经过次级通道得到的滤波信号被定义为观测矩阵,控制滤波器阶数为状态更新矩阵维数;三是状态转移矩阵,在短时间内,控制当前时刻的滤波器权系数与下一时刻近似一样,所以状态转移矩阵被定义为单位矩阵。KF算法通过协方差矩阵的更新提高预测模型的准确性,该协方差矩阵包含了各参数间的内在关联,在预测值随时间传递的同时,不确定性也随之迭代到下一步,不确定性的估计旨在通过对预测值与修正值的不断修正,使其达到一种动态的平衡。基于KF的混合结构自适应AVC系统框图如图1所示。
为初级通道传递函数;为干扰信号经初级通道后的期望信号;为次级通道传递函数,为次级通道的估计;xfn)表示算法反馈结构中的参考信号;为误差信号。分别为前馈结构和反馈结构的控制滤波器权系数;分别为前馈结构和反馈结构中参考信号经过次级通道的输入,对应KF算法中的测量矩阵;分别为前馈结构和反馈结构的输出。KF算法中的递推过程可以划分为时间更新和量测更新两个过程。在时间更新中,将控制滤波器权系数作为状态空间变量,则系统的状态预测方程为:
式中  n表示时刻;为先验状态估计值,由n时刻的状态转移矩阵n-1时刻状态的后验状态估计值求得。考虑模型具有一定的不确定性,用0均值的白噪声来表示。由于系统在预测过程中始终处于动态平衡,随着对预测值进行最优估计,这种不确定性也随之进行迭代,由协方差矩阵性质可得协方差预测方程为:
式(1)和(2)统称为时间更新方程。
下面通过量测信息对其修正,状态更新方程为:
式中  为新息方程,通过新息方程引入误差信号包含的噪声信息。为滤波增益矩阵,表示为:
式中  为测量噪声的协方差矩阵,主要表示测量过程中的不确定性。
由于过程噪声和测量噪声的引入,协方差矩阵更新为:
式(1)~(5)即为应用于振动有源控制的KF算法。本文仅考虑单通道主动控制,总结各变量释义如表1所示。
对KF算法和变步长FxLMS算法(简称VSSFxLMS)的运算量进行对比,其中VSSFxLMS算法参照文献[12],单次迭代各算法计算量详见表2,其中LH分别为辨识过程和控制过程的阶数。从表2中可以看出,混合KF算法的计算量较大。
考虑到在振动有源控制过程中,观测噪声的统计特性会对滤波器的估计精度和收敛速度产生较大的影响。针对状态预测方程建模的不精确问题,利用测量信息,即误差信号,对测量噪声协方差矩阵进行实时估计。
经过时间更新过程得到n时刻的状态预测值和先验估计协方差矩阵。基于KF算法量测更新过程,得到n时刻的量测预测值:
式中  M表示数据长度。
则,n时刻的新息方程为:
对式(7)两侧求方差,得到n时刻的量测预测协方差矩阵:
式中 
·
测量噪声协方差矩阵:
式中  在理论上表示随机序列的集总平均,然而在自适应滤波算法的实际应用中应以时间平均代替,因此的等加权递推估计可构造如下:
利用指数渐消记忆加权的方式替代等加权平均方式以减弱过去观测噪声的影响,则式(10)变为:
由式(12)可以看出,加权系数的初值b为渐消因子,取值范围为。当n足够大时,近似有,因此b取值越小,陈旧噪声的影响越小,通常b在0.9~0.99范围内取值。由式(11)可以看出,如果实际系统的观测噪声与理论建模值相比偏小,则会比较小;如果状态噪声设置偏大,则会比较大。以上两种情况都可能导致,从而容易使失去正定性,引起滤波异常。为避免此问题的发生,将的估计形式修改为渐进无偏估计。随着n的增加,会逐渐减小趋近于零,因此,的渐近无偏估计形式如下:
由式(13)可以看出,只要初始设置的是正定阵,且满足,那么在整个自适应估计过程中会一直保持正定,提高了算法的鲁棒性。
另一方面,由于对的估计采用了渐近无偏估计形式,在滤波开始阶段系统状态协方差阵还未收敛,此时忽略了项可能会在估计过程中引入较大的误差,严重时可能造成滤波器不稳定,因此在滤波开始阶段不宜对进行自适应估计。基于此,将加权系数改为如下分段形式:
式中  N为预设的正整数。
最后,利用测量噪声协方差矩阵的估计值进行KF算法量测更新,即估计当前时刻的状态和状态协方差矩阵。
以电机驱动海水泵为应用背景进行计算机仿真。仿真数据来自电机驱动海水泵振动实测数据。采样频率=1000 Hz。辨识过程和控制过程的滤波器阶数均为256。初级振源分别为频率为55,45和35 Hz的正弦信号,均进行4倍频谐波的仿真,幅值依次设定为0.2,0.15,0.1和0.08。为验证鲁棒性能,参考信号依次设为同初级振源信号、非相关频率60 Hz正弦信号和高斯白噪声。为验证稳定性,分别对频率突变及幅值突变进行仿真。为验证所提算法应对非稳态激励的控制性能,对时变频率及时变幅值进行仿真,同时考虑自适应的影响以及收敛速度,从而全面分析混合KF算法的振动有源控制性能。
在AVC控制之前,首先对作动器与传感器之间的传递函数进行系统辨识,辨识效果如图2所示。
为验证混合KF算法的有效性,首先与VSSFxLMS算法进行对比。设置参考信号为初级振源,降噪性能用表示,单位为dB,计算公式如下:
式中  为有源控制后误差信号的傅氏变换;为初级振源信号的傅氏变换。初级振源和参考信号均不带噪。频域控制效果如图3所示。
图3可知,在自适应过程收敛后,混合KF算法各倍频处的降噪性能明显优于VSSFxLMS算法,且降噪幅度较大。但前馈KF算法与混合KF算法控制效果相近,主要原因为参考信号同干扰源信号,导致混合KF结构中反馈的误差信号不再提供新的信息,因此失去了新息方程修正的作用。当参考信号与干扰源信号出现差异时,混合KF控制效果将明显优于前馈KF控制效果。下文分析验证混合KF算法的鲁棒性能。
为验证混合KF算法的鲁棒性能,初级振源选用45 Hz及4倍频谐波,参考信号分别设置为频率为60 Hz正弦信号和均值为零、方差为1的高斯白噪声(White Gaussian Noise,WGN)),其频域控制降噪效果如图4表3所示。
根据仿真结果可知,VSSFxLMS算法控制效果较差,前馈KF算法在控制效果方面略优于VSSFxLMS算法,混合KF算法控制效果显著。
从理论角度分析:基于LMS算法的自适应过程实质上是抵消干扰源信号中与参考信号相关的分量,只保留与其不相关的分量;基于KF算法的自适应过程是基于贝叶斯估计,当新息方程包含的信息越多,得到的最优值越准。综上所述,无论从理论推导,还是仿真结果分析,混合KF算法的鲁棒性能明显优于VSSFxLMS算法的鲁棒性能。
初级振源在25 s时,频率突变量设置为8%,信噪比约为10∶1,参考信号分别设置为突变前信号和WGN,分别对VSSFxLMS和混合KF进行仿真,仿真结果如图5所示。
由仿真结果可知,在降噪性能方面,混合KF算法优于VSSFxLMS算法。
由理论分析得,两种参考信号相比,当参考信号为WGN时,测量值与真实值的差值较大,导致最优估计偏差变大,因此,当参考信号越接近初级振源信号时,降噪性能越好,理论与仿真结果吻合。考虑在频率突变过程中,混合KF算法中的测量噪声协方差阵仍为固定值,这不利于降噪性能的提升。因此,下文对测量噪声协方差矩阵进行自适应调整,选取突变频率为45 Hz进行仿真。
图6给出了Np对比,调用自适应后,在各倍频处降噪性能明显提升。调用自适应前=1,调用自适应后,收敛至较低的值,不确定性范围缩小,利于收敛和最优估计值。因此,调用自适应后,能够有效跟踪信号的动态变化。
初级振源在25 s时,设置幅值突变量为原来的2倍,信噪比约为10∶1,参考信号分别设置为突变前信号和WGN,分别对VSSFxLMS和混合KF进行仿真,仿真结果如图7所示。
由仿真结果得,混合KF算法在降噪性能方面优于VSSFxLMS算法。当参考信号为突变前信号时,混合KF算法的控制效果最佳,当参考信号为WGN时,控制效果明显下降,但仍优于VSSFxLMS算法。由理论分析得,当参考信号为WGN时,引入的白噪声会在控制过程中进行传递,会对有用信号跟踪产生影响,因此理论与仿真结果吻合。
与频率突变相同,当参考信号越接近初级振源信号时,降噪性能越好。选取幅值突变频率为45 Hz进行测量噪声协方差矩阵仿真。
图8可知,调用自适应后,幅值突变频域控制效果明显提升,调用自适应前=1,调用自适应后,收敛至较低的值,不确定性范围缩小,有利于增强初级振动源扰动时系统的稳定性,因此,本文所提的测量噪声协方差矩阵能够在线更新策略,有效跟踪信号的动态变化。
针对振动有源控制算法的鲁棒性和稳定性问题,提出一种混合结构自适应控制策略,不同于经典的FxLMS算法,参考信号可为白噪声。通过仿真结果分析,在初级振动源特性突变情况下,如频率和幅值的突变,混合KF算法的控制效果均优于VSSFxLMS算法。同时测量噪声协方差矩阵在线更新策略在应对频率突变、幅值突变时效果良好。因此,本文搭建的混合结构自适应振动有源控制策略在鲁棒性和稳定性方面优于VSSFxLMS算法。为振动有源控制提供了一种控制策略。
  • 国家自然科学基金资助项目(51775124)
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2024年第37卷第12期
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doi: 10.16385/j.cnki.issn.1004-4523.2024.12.010
  • 接收时间:2023-07-27
  • 首发时间:2026-02-12
  • 出版时间:2024-12-28
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  • 收稿日期:2023-07-27
  • 修回日期:2023-10-10
基金
国家自然科学基金资助项目(51775124)
作者信息
    1哈尔滨工程大学动力与能源工程学院,黑龙江 哈尔滨 150001
    2哈尔滨工程大学烟台研究院,山东 烟台 264000

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刘学广(1973―),男,博士,教授。E-mail:
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2种不同金属材料的力学参数

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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