Article(id=1149420605407134025, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1149420601376412046, articleNumber=null, orderNo=null, doi=10.19562/j.chinasae.qcgc.2025.04.016, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1724601600000, receivedDateStr=2024-08-26, revisedDate=1730736000000, revisedDateStr=2024-11-05, acceptedDate=null, acceptedDateStr=null, onlineDate=1751972827509, onlineDateStr=2025-07-08, pubDate=1745510400000, pubDateStr=2025-04-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1751972827509, onlineIssueDateStr=2025-07-08, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1751972827509, creator=13701087609, updateTime=1751972827509, updator=13701087609, issue=Issue{id=1149420601376412046, tenantId=1146029695717560320, journalId=1146120084050784272, year='2025', volume='47', issue='4', pageStart='587', pageEnd='795', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1751972826539, creator=13701087609, updateTime=1754389785974, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1159558063947952346, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1149420601376412046, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1159558063947952347, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1149420601376412046, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=755, endPage=763, ext={EN=ArticleExt(id=1149420607466537295, articleId=1149420605407134025, tenantId=1146029695717560320, journalId=1146120084050784272, language=EN, title=Interval Type2-Smith Fuzzy Based Time Delay Compensation Control for Magnetorheological Semi-active Suspension, columnId=1149809889280750125, journalTitle=Automotive Engineering, columnName=Selected Papers, runingTitle=null, highlight=

For the limitation of traditional type-1 Smith fuzzy control in terms of inadequate time delay compensation and insufficient robustness under varying parameter driving conditions,an interval type-2 Smith fuzzy time delay compensation control method is introduced for magnetorheological (MR) semi-active suspension systems. This approach incorporates the vehicle's vertical acceleration,suspension deflection,and tire dynamic displacement as the state input of the control system,enabling a comprehensive capture and response to dynamic vehicle changes. By introducing in upper and lower membership functions,the method defines clear membership intervals for fuzzy variables,which are then leveraged to calculate activation intervals under various fuzzy rules,significantly enhancing the system's anti-interference capability. Additionally,the Center-of-sets algorithm is innovatively introduced into the fuzzy reduction process,avoiding redundant normalization calculation during the type reduction of type-2 fuzzy sets,thereby improving the system's execution speed and real-time performance. Simulation results demonstrate that the proposed interval type-2 Smith fuzzy delay compensation control strategy achieves improvement in both control effectiveness and robustness for MR semi-active suspension systems,effectively tackling complex and varied driving environment.

, articleAbstract=

For the limitation of traditional type1 Smith fuzzy control in terms of inadequate time delay compensation and insufficient robustness under varying parameter driving conditions, an interval type2 Smith fuzzy time delay compensation control method is introduced for magnetorheological (MR) semiactive suspension systems. This approach incorporates the vehicle's vertical acceleration, suspension deflection, and tire dynamic displacement as the state input of the control system, enabling a comprehensive capture and response to dynamic vehicle changes. By introducing in upper and lower membership functions, the method defines clear membership intervals for fuzzy variables, which are then leveraged to calculate activation intervals under various fuzzy rules, significantly enhancing the system's antiinterference capability. Additionally, the Centerofsets algorithm is innovatively introduced into the fuzzy reduction process, avoiding redundant normalization calculation during the type reduction of type2 fuzzy sets, thereby improving the system's execution speed and realtime performance. Simulation results demonstrate that the proposed interval type2 Smith fuzzy delay compensation control strategy achieves improvement in both control effectiveness and robustness for MR semiactive suspension systems, effectively tackling complex and varied driving environment.

, correspAuthors=Juncheng Wang, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Juncheng Wang, Mingyao Zhou, Shiwei Zhang), CN=ArticleExt(id=1149420616345879035, articleId=1149420605407134025, tenantId=1146029695717560320, journalId=1146120084050784272, language=CN, title=磁流变半主动悬架史密斯-区间二型模糊时滞补偿控制*, columnId=1149809889410773550, journalTitle=汽车工程, columnName=精选论文, runingTitle=null, highlight=

针对传统史密斯-一型模糊控制在变参数工况下的时滞补偿不足与鲁棒性欠佳等问题,提出一种磁流变半主动悬架史密斯-区间二型模糊时滞补偿控制方法。该方法将车身垂直加速度、悬架动挠度和轮胎动位移作为控制系统的状态输入,全面捕捉并响应车辆动态变化;通过引入上下隶属度函数,明确了模糊变量隶属度区间,进而计算出不同模糊规则下的激活度区间,显著提升了系统抗干扰能力;创新性地引入Center-of-sets算法优化模糊降阶过程,避免归一化重复计算,提升系统执行速度与实时性。仿真结果显示,该控制策略在提升磁流变半主动悬架控制效果与鲁棒性方面表现优异,有效应对复杂多变行驶环境。

, articleAbstract=

针对传统史密斯——型模糊控制在变参数工况下的时滞补偿不足与鲁棒性欠佳等问题,提出一种磁流变半主动悬架史密斯区间二型模糊时滞补偿控制方法。该方法将车身垂直加速度、悬架动挠度和轮胎动位移作为控制系统的状态输入,全面捕捉并响应车辆动态变化;通过引入上下隶属度函数,明确了模糊变量隶属区间,进而计算出不同模糊规则下的激活度区间,显著提升了系统抗干扰能力;创新性地引入Centerofsets 算法优化模糊降阶过程,避免归一化重复计算,提升系统执行速度与实时性。仿真结果显示,该控制策略在提升磁流变半主动悬架控制效果与鲁棒性方面表现优异,有效应对复杂多变行驶环境。

, correspAuthors=王骏骋, authorNote=null, correspAuthorsNote=
王骏骋,特聘副教授,博士,E-mail:
, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=uOb0fWIrFEeq8TJR1yQPEQ==, magXml=pHe69pbfrU/7FM3tMG8bqA==, pdfUrl=null, pdf=gFFEyyVLz/zMaa0suLrkbQ==, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=4nfFjalG95ufkMQWapaNtA==, mapNumber=null, authorCompany=null, fund=null, authors=

特聘副教授,博士

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参数 数值 参数 数值
m1/kg 35 m2/kg 500
k1/(N·m-1 300 000 k2/(N·m-1 50 500
cs/(N·s·m-1 700 δ1 53 775
δ2 4 108.8
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半主动悬架相关参数

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参数 数值 参数 数值
m1/kg 35 m2/kg 500
k1/(N·m-1 300 000 k2/(N·m-1 50 500
cs/(N·s·m-1 700 δ1 53 775
δ2 4 108.8
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RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊

(14.20 ms)

史密斯-

二型模糊

(14.20 ms)

J t 124.932 0 56.210 4 86.858 6 71.233 7
a/(m·s-2 2.609 7 1.622 6 2.144 4 1.941 1
z 1 - q)/m 0.006 7 0.005 5 0.006 0 0.005 8
z 2 - z 1)/m 0.024 4 0.014 5 0.020 1 0.015 1
), ArticleFig(id=1170298570314887845, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1149420605407134025, language=CN, label=表2, caption=

名义工况条件下评价指标均方根值

, figureFileSmall=null, figureFileBig=null, tableContent=
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊

(14.20 ms)

史密斯-

二型模糊

(14.20 ms)

J t 124.932 0 56.210 4 86.858 6 71.233 7
a/(m·s-2 2.609 7 1.622 6 2.144 4 1.941 1
z 1 - q)/m 0.006 7 0.005 5 0.006 0 0.005 8
z 2 - z 1)/m 0.024 4 0.014 5 0.020 1 0.015 1
), ArticleFig(id=1170298570411356838, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1149420605407134025, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
(a) 参数状态1: 1.3 m 2 0.7 k 1 τ = 14.2   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊(14.20 ms)

史密斯-

二型模糊(14.20 ms)

J t 61.322 3 43.747 6 56.045 4 48.907 5
a/(m·s-2 1.423 2 1.134 9 1.365 9 1.286 9
z 1 - q)/m 0.006 6 0.005 6 0.006 2 0.005 8
z 2 - z 1)/m 0.017 0 0.015 2 0.016 8 0.015 1
(b) 参数状态2: 0.7 m 2 1.3 k 1 τ = 14.2   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊(14.20 ms)

史密斯-

二型模糊(14.20 ms)

J t 161.770 5 97.795 6 130.127 7 124.590 8
a/(m·s-2 3.441 5 2.545 3 3.042 2 2.960 2
z 1 - q)/m 0.006 0 0.005 4 0.005 6 0.005 6
z 2 - z 1)/m 0.021 9 0.014 4 0.019 4 0.016 2
(c) 参数状态3: m 2 1.3 k 1 τ = 10   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊

(10 ms)

史密斯-

二型模糊

(10 ms)

J t 133.205 3 57.393 5 88.684 7 65.935 0
a/(m·s-2 2.774 8 1.693 9 2.229 5 1.919 5
z 1 - q)/m 0.006 2 0.005 3 0.005 7 0.005 4
z 2 - z 1)/m 0.025 8 0.014 5 0.020 8 0.014 2
(d) 参数状态4: 0.7 m 2 k 1 τ = 20   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊(14.20 ms)

史密斯-

二型模糊(14.20 ms)

J t 163.766 4 96.188 9 132.061 0 126.455 9
a/(m·s-2 3.427 4 2.464 1 3.020 5 2.943 9
z 1 - q)/m 0.006 5 0.005 6 0.006 0 0.006 0
z 2 - z 1)/m 0.022 2 0.014 6 0.019 7 0.017 0
), ArticleFig(id=1170298570486854311, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1149420605407134025, language=CN, label=表3, caption=

变参数条件下评价指标均方根值

, figureFileSmall=null, figureFileBig=null, tableContent=
(a) 参数状态1: 1.3 m 2 0.7 k 1 τ = 14.2   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊(14.20 ms)

史密斯-

二型模糊(14.20 ms)

J t 61.322 3 43.747 6 56.045 4 48.907 5
a/(m·s-2 1.423 2 1.134 9 1.365 9 1.286 9
z 1 - q)/m 0.006 6 0.005 6 0.006 2 0.005 8
z 2 - z 1)/m 0.017 0 0.015 2 0.016 8 0.015 1
(b) 参数状态2: 0.7 m 2 1.3 k 1 τ = 14.2   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊(14.20 ms)

史密斯-

二型模糊(14.20 ms)

J t 161.770 5 97.795 6 130.127 7 124.590 8
a/(m·s-2 3.441 5 2.545 3 3.042 2 2.960 2
z 1 - q)/m 0.006 0 0.005 4 0.005 6 0.005 6
z 2 - z 1)/m 0.021 9 0.014 4 0.019 4 0.016 2
(c) 参数状态3: m 2 1.3 k 1 τ = 10   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊

(10 ms)

史密斯-

二型模糊

(10 ms)

J t 133.205 3 57.393 5 88.684 7 65.935 0
a/(m·s-2 2.774 8 1.693 9 2.229 5 1.919 5
z 1 - q)/m 0.006 2 0.005 3 0.005 7 0.005 4
z 2 - z 1)/m 0.025 8 0.014 5 0.020 8 0.014 2
(d) 参数状态4: 0.7 m 2 k 1 τ = 20   m s
RMS

被动

悬架

史密斯-

二型模糊

(0 ms)

史密斯-

一型模糊(14.20 ms)

史密斯-

二型模糊(14.20 ms)

J t 163.766 4 96.188 9 132.061 0 126.455 9
a/(m·s-2 3.427 4 2.464 1 3.020 5 2.943 9
z 1 - q)/m 0.006 5 0.005 6 0.006 0 0.006 0
z 2 - z 1)/m 0.022 2 0.014 6 0.019 7 0.017 0
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磁流变半主动悬架史密斯-区间二型模糊时滞补偿控制*
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王骏骋 , 周明垚 , 章世伟
汽车工程 | 精选论文 2025,47(4): 755-763
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汽车工程 | 精选论文 2025, 47(4): 755-763
磁流变半主动悬架史密斯-区间二型模糊时滞补偿控制*
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王骏骋 , 周明垚, 章世伟
作者信息
  • 浙江理工大学机械工程学院,杭州 310018

通讯作者:

王骏骋,特聘副教授,博士,E-mail:
Interval Type2-Smith Fuzzy Based Time Delay Compensation Control for Magnetorheological Semi-active Suspension
Juncheng Wang , Mingyao Zhou, Shiwei Zhang
Affiliations
  • School of Mechanical Engineering,Zhejiang Sci-Tech University,Hangzhou 310018
出版时间: 2025-04-25 doi: 10.19562/j.chinasae.qcgc.2025.04.016
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针对传统史密斯——型模糊控制在变参数工况下的时滞补偿不足与鲁棒性欠佳等问题,提出一种磁流变半主动悬架史密斯区间二型模糊时滞补偿控制方法。该方法将车身垂直加速度、悬架动挠度和轮胎动位移作为控制系统的状态输入,全面捕捉并响应车辆动态变化;通过引入上下隶属度函数,明确了模糊变量隶属区间,进而计算出不同模糊规则下的激活度区间,显著提升了系统抗干扰能力;创新性地引入Centerofsets 算法优化模糊降阶过程,避免归一化重复计算,提升系统执行速度与实时性。仿真结果显示,该控制策略在提升磁流变半主动悬架控制效果与鲁棒性方面表现优异,有效应对复杂多变行驶环境。

半主动悬架  /  磁流变减振器  /  时滞补偿  /  史密斯  /  区间二型模糊控制

For the limitation of traditional type1 Smith fuzzy control in terms of inadequate time delay compensation and insufficient robustness under varying parameter driving conditions, an interval type2 Smith fuzzy time delay compensation control method is introduced for magnetorheological (MR) semiactive suspension systems. This approach incorporates the vehicle's vertical acceleration, suspension deflection, and tire dynamic displacement as the state input of the control system, enabling a comprehensive capture and response to dynamic vehicle changes. By introducing in upper and lower membership functions, the method defines clear membership intervals for fuzzy variables, which are then leveraged to calculate activation intervals under various fuzzy rules, significantly enhancing the system's antiinterference capability. Additionally, the Centerofsets algorithm is innovatively introduced into the fuzzy reduction process, avoiding redundant normalization calculation during the type reduction of type2 fuzzy sets, thereby improving the system's execution speed and realtime performance. Simulation results demonstrate that the proposed interval type2 Smith fuzzy delay compensation control strategy achieves improvement in both control effectiveness and robustness for MR semiactive suspension systems, effectively tackling complex and varied driving environment.

semi-active suspension  /  magnetorheological (MR) damper  /  time delay compensation  /  Smith  /  interval type2 fuzzy control
王骏骋, 周明垚, 章世伟. 磁流变半主动悬架史密斯-区间二型模糊时滞补偿控制*. 汽车工程, 2025 , 47 (4) : 755 -763 . DOI: 10.19562/j.chinasae.qcgc.2025.04.016
Juncheng Wang, Mingyao Zhou, Shiwei Zhang. Interval Type2-Smith Fuzzy Based Time Delay Compensation Control for Magnetorheological Semi-active Suspension[J]. Automotive Engineering, 2025 , 47 (4) : 755 -763 . DOI: 10.19562/j.chinasae.qcgc.2025.04.016
磁流变半主动悬架,以其阻尼力连续可调、响应迅捷、能耗低及宽范围阻尼控制能力,成为当前底盘研究热点之一[1]。然而,信号传递和处理及减振器响应等均伴随时滞,导致阻尼力与悬架状态不匹配,影响了系统稳定性[2]。因此,研究悬架系统的时滞补偿控制策略具有重要意义。
国内外学者对主动/半主动悬架系统响应时滞问题进行了大量研究,其主要思路是将控制策略与时滞补偿策略相结合,常见的控制策略包括:PID控制[3]、LQG控制[4]和自适应控制[5]等;常见的时滞解决方法有Lyapunov-Krasovskii 鲁棒控制理论[6]和史密斯预测控制器[7]两类。Lyapunov-Krasovskii泛函方法通过构造含时滞的泛函来抑制时滞导致的悬架性能下降,但受限于时滞约束,难以在保证鲁棒性的同时实现最优控制[8-9]。而史密斯预估方法是在控制反馈回路中引入时滞补偿环节来提升时滞补偿控制效果。Tao等[10]提出了一种基于史密斯和泰勒级数的LQG控制方法;桂航等[11]设计了一种史密斯-PID控制器,能够抑制驾驶室的振动响应。尽管最优控制策略能够实现精确控制,但缺乏鲁棒性。PID控制虽可调响应快,但对非线性系统控制效果有限。因此,须探索更先进控制策略,以提高控制系统的鲁棒性和适应性。
模糊控制可有效改善非线性系统静/动态控制特性[12]。Pang等[13]将模糊控制与史密斯预估相结合来提高系统时滞补偿能力,但上述控制方法的控制效果及鲁棒性能仍有较大提升空间。虽然传统模糊控制能够结合史密斯预估器,但其单一隶属度函数限制了系统的抗干扰能力。此外,Wong等[14]采用区间二型模糊控制方法来应对车辆悬架控制系统不确定性影响。但是,上述研究并未将区间二型模糊控制与任何时滞控制方法相结合,因此该控制系统无法有效应对时滞对悬架控制系统带来的不利影响。
鉴于区间二型模糊控制及传统模糊时滞补偿策略的局限性,本文融合了史密斯预估器的时滞解耦与补偿优势,提出了一种磁流变半主动悬架史密斯-区间二型模糊时滞补偿控制策略。该方法以车身垂直加速度、悬架动挠度和轮胎动位移作为核心状态输入,实现对车辆动态特性的全面捕捉与即时响应,精确补偿系统时滞,提高控制效果;并通过定义模糊变量的上下隶属度函数计算出不同模糊规则下的激活度区间,精确计算出各模糊规则下的激活度区间,增强了系统鲁棒性;引入了Center-of-sets算法优化计算流程,成功避免了模糊降型过程中的冗余计算,进一步提升了控制策略的执行效率。在控制策略的设计过程中,考虑了面对复杂多变的行驶环境需求,通过模拟多种工况下的行驶条件,全面验证了控制策略的有效性与鲁棒性,为解决复杂动态系统时滞与干扰问题提供了新视角和有力的技术支撑。
构建如图1所示的四分之一车垂向动力学模型[15]
根据牛顿第二定律,模型运动方程表达如下:
m 1 z ¨ 1 + c s z ˙ 1 - z ˙ 2 + k 1 z 1 - q + k 2 z 1 - z 2 = - F r m 2 z ¨ 2 + c s z ˙ 2 - z ˙ 1 + k 2 z 2 - z 1 = F r
式中: m 1 m 2分别表示车辆的非簧载和簧载质量,对应的垂直位移分别为 z 1 z 2 k 1 k 2分别表示轮胎刚度和悬架刚度; c s为磁流变减振器黏滞阻尼; F r为时滞为τ的磁流变减振器在 t时刻产生的库伦阻尼力; q为路面输入模型。
Bingham模型经常被用以描述磁流变减振器力学特性[16],具有结构精简、参数简明等特性,能直接且灵敏地反映参数变化对悬架系统性能的影响。根据Lord公司RD-1005-3磁流变减振器测试数据,建立了不考虑时滞的Bingham模型[4]
F ( t ) = c s z ˙ 2 - z ˙ 1 + F r s g n z ˙ 2 - z ˙ 1 F r = 1510.1 I
式中: F t F r分别为磁流变器减振器 t时刻阻尼力和库伦阻尼力; s g n ( )为符号函数; I为电流。
当磁流变减振器时滞为 τ时,库伦阻尼力满足:
F r ' = F r ( t - τ ) = 1510.1 I ( t - τ )
设定半主动悬架控制系统的状态向量为
X = z 1 - q , z 2 - z 1 , z ˙ 1 , z ˙ 2 T
式(4)代入式(1),进一步构建状态空间方程:
X ˙ = A X + B U + G W
W = [ q ˙ ] B = 0 0 1 m 1 1 m 2 T
U = F r ' G = - 1 0 0 0 T
A = 0 0 1 0 0 0 - 1 1 - k 1 m 1 k 2 m 1 - c s m 1 c s m 1 0 - k 2 m 2 c s m 2 - c s m 2
基于车身垂直加速度 z ¨ 2、悬架动挠度 z 2 - z 1以及轮胎动位移 z 1 - q 3个单一评价指标,构建磁流变半主动悬架的综合性能评价指标 J J值越小说明悬架系统综合性能越好[17] J满足:
J = l i m T 1 T 0 T z ¨ 2 2 + δ 1 z 1 - q 2 + δ 2 z 2 - z 1 2 d t = l i m T 1 T 0 T X T Q X + 2 X T N U + U T R U d t
Q = δ 1 0 0 0 0 δ 2 + k 2 2 m 2 2 - k 2 c s m 2 2 k 2 c s m 2 2 0 - k 2 c s m 2 2 c s 2 m 2 2 - c s 2 m 2 2 0 k 2 c s m 2 2 - c s 2 m 2 2 c s 2 m 2 2
N = 0 0 0 0 T R = [ 0 ]
式中: T为车辆行驶总时间; z ¨ 2的加权系数默认为1时, z 1 - q z 2 - z 1加权系数分别为 δ 1 δ 2
传统一型模糊控制器设计主要包括模糊集合构建与模糊化、模糊规则构建与模糊推理、去模糊化3个步骤。本节针对基于传统一型模糊控制方法的半主动悬架系统设计步骤及其缺点进行分析。根据文献[13]上述3个步骤具体描述如下。
步骤1:模糊集合构建与模糊化
根据二维输入变量模糊控制器(设定车身加速度误差和车身加速度误差的变化率为输入变量),构建模糊集合(其中NB、NM、NS、ZO、PS、PM、PB分别表示“负大”,“负中”,“负小”,“零”,“正小”,“正中”,“正大”,将输入变量范围划分为7个等级)。基于半主动悬架动态特性确定表征输入值的隶属度函数,通过将精确输入值转化为隶属度值组成的集合,得到模糊输入,进而完成模糊化过程。
步骤2:模糊规则构建与模糊推理
基于经验法构建49条模糊规则,引用权重因子调整模糊规则,利用Mamdani方法推理得到模糊输出。
步骤3:去模糊化
利用质心法进行去模糊化,计算隶属度函数曲线与横坐标围成面积的质心,将模糊输出转换为可控阻尼力值,用于半主动悬架控制。
上述控制系统虽然在一定程度上能满足半主动悬架性能控制需求,但是仍存在如下两点不足。
(1)输入维度约束下的性能局限。传统模糊控制器在设计上主要面向输入变量较少、系统结构相对简单的应用场景。但在处理如磁流变半主动悬架系统等复杂系统时,须综合多维度信息(如车身垂直加速度、悬架动挠度、轮胎动位移)以全面反映状态。受限于二维设计,现有系统未能充分利用这些信息,影响控制效能。
(2)隶属度函数单一性对抗干扰能力制约。传统模糊控制器在隶属度函数上采用精确数值,对确定性信息有效,但对不确定性信息灵活性不足。实际系统中,路面、车速、载质量等变量含丰富的不确定性信息,精确表征这些信息对提升控制效果关键。因隶属度函数设计单一,传统控制器在面对不确定因素时抗干扰能力弱,难以在复杂工况下实现稳定控制。
为弥补传统一型模糊控制与史密斯预估在信息量不足及不确定信息处理上的局限,本研究创新性地融合区间二型模糊控制理论,通过上下隶属度函数精确界定隶属度区间,并引入Center-of-sets算法优化计算效率,避免归一化冗余。基于此,构建了史密斯-区间二型模糊时滞补偿控制策略,显著提升系统抗干扰能力,其工作流程如图2所示。
图2所示,史密斯-区间二型时滞补偿控制系统集成实时传感器数据,依据先进控制策略计算磁流变减振器的理想需求电流。电流源接收控制指令后,精确输出电流至减振器,从而调节车辆所需的库仑阻尼力。进一步地,史密斯-区间二型时滞补偿控制系统的设计步骤如下。
步骤1:确定输入和输出变量及隶属度函数
控制系统的输入增加至3个,即轮胎动位移、悬架动挠度和车身垂直加速度,输出为理想主动控制力,对应的模糊集合分别为x1={NB,ZO,PB},x2={NB,ZO,PB},x3={NB,ZO,PB}和y={C1,C2,…,C27},其中NB、ZO和PB分别表示“负大”、“零”和“正大”;C1,C2,…,C27则表示由小到大的输出模糊子集。此外,设定控制输入和输出变化范围为:z1-q∈[-0.05,0.05];a∈[-6,6];z2-z1∈[-0.02,0.02]; F r '∈[-2000,2000]。
相比于传统一型模糊控制,区间二型模糊集合输入变量中各模糊子集对应的隶属度函数均由上/下隶属度函数UMF和LMF构成[18],不确定覆盖域FOU为UMF至LMF的区间,能更为全面地描述车辆载荷和轮胎刚度变化等外界不确定信息对控制系统所造成的影响。
构建如图3所示区间二型模糊控制输入变量的隶属度函数。
其表达式如下:
U M F : u ¯ ( x ) = e x p - 1 2 x - c σ ¯ 2 L M F : u ̲ ( x ) = e x p - 1 2 x - c σ ̲ 2
式中: x是输入元素; c为高斯型隶属度函数均值; σ ¯ σ ̲分别为高斯型隶属度函数标准差上界和下界。
通过构建上/下隶属度函数,调整所述高斯型隶属度函数标准差和均值,优化隶属度范围分布,从而降低不确定信息对控制效果的影响。
步骤2:设定模糊控制规则和激活度
一个设定N条规则的区间二型模糊系统,每条规则有以下表达形式:
R i : I f   x 1   i s   X ˜ 1 n   a n d   x 2   i s   X ˜ 2 n   a n d   x i   i s   X ˜ i n T h e n   y   i s   Y n   ( n = 1,2 , , N )
式中: X ˜ i n ( i = 1,2 , , I )为输入区间二型模糊集; Y n为模糊规则后件模糊集。
使用乘法t-norm计算第n条激活度区间:
F n x i = u X ̲ 1 n x 1 × × u X ̲ I n x i , u X ¯ 1 n x 1 × × u X ¯ I n x i f ̲ n , f ¯ n
式中: i = 1,2 , 3 , . . . , I n = 1,2 , 3 , , N u X ̲ i n x i u X ¯ i n x i是输入模糊集的上下隶属度,组成隶属度区间; f ̲ n f ¯ n分别代表激活度的上下界限。
设计如下27条区间二型模糊规则:
R 1 : I f   x 1   i s   N B   a n d   x 2   i s   N B   a n d   x 3   i s   N B   T h e n   y   i s   C 1 R 2 : I f   x 1   i s   N B   a n d   x 2   i s   N B   a n d   x 3   i s   Z O   T h e n   y   i s   C 2 R 3 : I f   x 1   i s   N B   a n d   x 2   i s   N B   a n d   x 3   i s   P B   T h e n   y   i s   C 3 R 27 : I f   x 1   i s   P B   a n d   x 2   i s   P B   a n d   x 3   i s   P B   T h e n   y   i s   C 27
根据上述隶属度函数和激活度,计算输出的模糊集合,实现区间二型模糊推断。
步骤3:模糊降阶和去模糊化
区间二型模糊集合通常需要更为复杂的数学运算,将其降阶到1阶模糊集可大幅降低计算复杂度,采用Center-of-sets 降阶器[19]表达如下:
y c o s ( x ) = f n n F n ( x ) y n Y n n = 1 N f n y n n = 1 N f n = y l , y r
y l = n = 1 L f ¯ n y ̲ n + n = L + 1 N f ̲ n y ̲ n n = 1 L f ¯ n + n = L + 1 N f ̲ n
y r = n = 1 R f ̲ n y ¯ n + n = R + 1 N f ¯ n y ¯ n n = 1 R f ̲ n + n = R + 1 N f ¯ n
式中: y l y r分别为区间二型模糊集合降阶输出左端点和右端点; L为左转换点; R为右转换点; f ̲ n f ¯ n分别代表激活度的上下界限; y ¯ n y ̲ n分别为隶属度函数对应的规则后件的上下界限质心,满足式(13)式(14)不等式关系。
y ̲ L y l y ̲ L + 1
y ¯ R y r y ¯ R + 1
对模糊降阶得到的输出进行去模糊化后的输出 y
y = y l + y r 2
上述Center-of-sets降阶器巧妙地通过计算区间二型模糊集合的中心点,直接生成1阶模糊集合,此过程无须繁琐地操作隶属度函数,从而显著减少了不必要的重复计算,提升了效率。
步骤4:实施史密斯预估时滞补偿控制
通过将史密斯预估补偿器与区间二型模糊控制器巧妙融合,针对系统闭环方程中的纯滞后项,设计了预估补偿环节,该环节有效地将纯滞后项从系统闭环方程中剥离,并促使系统输出在时间上提前时滞量,从而精准抵消纯滞后效应带来的不利影响[20]。所提出的史密斯-区间二型模糊时滞补偿控制系统的工作原理如图4所示。
图中: D ( s )表示控制器传递函数; G ( s ) e - τ s为时滞被控系统的传递函数; G ( s )为无时滞被控系统传递函数; e - τ s为被控系统的纯滞后部分的传递函数; u ( s ) r ( s ) y ( s )分别为控制器输入、参考输入及系统输出的拉普拉斯变换。
图4所示,结合区间二型模糊控制器和史密斯预估器设计的控制器为 D ¯ ( s ),其表达式为
D ¯ ( s ) = D ( s ) 1 + D ( s ) G ( s ) 1 - e - τ s
设计的史密斯-区间二型模糊控制系统的总传递函数表达式如下:
N ( s ) = D ¯ ( s ) G ( s ) e - τ s 1 + D ¯ ( s ) G ( s ) e - τ s = D ( s ) G ( s ) 1 + D ( s ) G ( s ) e - τ s
上述控制系统接收由半主动悬架车辆传感器采集的输入信号,经计算后输出理想控制力。
步骤5:计算理想需求电流
根据磁流变减振器的力学特性,其库仑阻尼力具有一定变化范围,实际中的主动控制力满足:
F M R ( t ) = F M R m i n , F s ( t ) F M R m i n F s ( t ) , F M R m i n < F s ( t ) < F M R m a x F M R m a x , F s ( t ) F M R m a x
式中: F M R m i n F M R m a x分别为磁流变减振器所能产生的最小和最大控制阻尼力; F s ( t )为约束阻尼力。
电流计算环节根据库伦阻尼力和电流的关系,通过上述步骤4得到理想控制力,由式(3)可推导出式(19),计算可得控制电流 I ( t )
I ( t ) = F M R ( t ) 1510.1
经计算所得理想控制电流,由控制器转换产生电流源控制信号,经过电流源产生实际控制电流,作用于磁流变减振器,磁流变减振器在电流作用下内部形成磁场,产生可控制的库伦阻尼力,最终作用于车辆,实现减振效果。
假设车辆在C级路面名义工况下以20 m/s的速度行驶,且满足:
q ˙ = - 2 π f 0 q + 2 π n 0 w G q n 0 v
式中: n 0 = 0.1   m - 1是空间参考频率; w是路面白噪声信号; G q n 0是路面不平度系数; v是车速; f 0是下截止时间频率。
磁流变减振器时滞取14.2 ms[21],半主动悬架参数见表1 [10]
图5表示名义工况下悬架性能比较曲线。其中Passive表示被动悬架;Type2-Simth(0 ms)表示无时滞状态下的史密斯-区间二型模糊控制器;Type1-Simth(14.2 ms)表示14.2 ms时滞下的史密斯-一型模糊控制器;Type2-Simth(14.2 ms)表示14.2 ms时滞下的史密斯-区间二型模糊控制器。表2为名义工况条件评价指标的均方根值。
图5表2所示,在名义工况下,与被动悬架及史密斯-一型模糊控制相比,采用史密斯-区间二型模糊控制器后,车身垂直加速度均方根值分别降低了25.62%与9.48%;轮胎动位移均方根值也分别减少了13.42%与3.75%;同时,悬架动挠度均方根值分别下降38.24%与24.95%;尤为重要的是,悬架综合性能指标与时间乘积的均方根值分别降低了42.98%与17.99%,全面验证了史密斯-区间二型模糊控制器在各项性能指标上的优越性。
在车辆实际运行中,除磁流变减振器的固有时滞外,动态变化的行驶环境带来的不确定信息同样会深刻影响悬架的控制效能。鉴于此,深入探究半主动悬架在不同响应时滞及多样化参数条件下的性能表现,对于提升整体操控稳定性和乘坐舒适性具有重要意义。
根据文献[20],将响应时滞设为10、14.20和20 ms,并选择以下4种参数状态:
变参数工况1( 1.3 m 2 0.7 k 1 τ = 14.2   m s);
变参数工况2( 0.7 m 2 1.3 k 1 τ = 14.2   m s);
变参数工况3( m 2 1.3 k 1 τ = 10   m s);
变参数工况4( 0.7 m 2 k 1 τ = 20   m s)。
图6~图9分别表示4种参数状态下车身垂直加速度PSD频率变化曲线和悬架综合性能指标J随时间t的变化曲线。表3表示上述4种变参数条件下各评价指标的均方根值。
图6~图9表明:在4种参数状态下,相比于被动悬架和史密斯-一型模糊控制器,史密斯-区间二型模糊控制器能更好地降低车身垂直加速度,同时能实现较为理想的悬架综合性能。
表3显示,相较于被动悬架,采用史密斯-区间二型模糊控制器的车身垂直加速度均方根值在4种参数状态下分别降低了9.58%、13.98%、30.82%和14.11%;轮胎动位移均方根值分别降低了11.89%、6.53%、12.56%和7.77%;悬架动挠度分别下降11.44%、25.72%、44.95%和23.31%;悬架综合性能与时间乘积均方根值分别降低了20.25%、22.98%、50.50%和22.78%。相较于史密斯-一型模糊控制器,采用史密斯-区间二型模糊控制器的车身垂直加速度均方根值分别降低了5.79%、2.69%、13.90%和2.54%;轮胎动位移均方根值分别降低了6.07%、0.93%、4.37%和0.47%;悬架动挠度均方根值分别下降10.17%、16.35%、31.58%和13.80%;悬架综合性能与时间乘积均方根值分别降低了12.74%、4.25%、25.65%和4.24%。
仿真结果表明,在4种不同参数状态下,史密斯-区间二型模糊控制器不仅在性能上全面超越了被动悬架,还显著优于传统的史密斯-一型模糊控制器。其车身垂直加速度均方根值平均降低了22.10%和14.75%,而悬架综合性能与时间乘积均方根值则平均下降了34.2%和21.92%。这表明,在变参数工况下,史密斯-区间二型模糊控制器表现出更理想的控制效果及鲁棒性。
本文设计了一种史密斯-区间二型模糊控制器,通过引入区间二型模糊控制将不确定性信息转化为上下隶属度区间范围全面地描述模糊变量的不确定性,同时利用史密斯预估控制原理来补偿系统时滞,克服了传统模糊史密斯控制处理不确定信息能力的局限性。仿真结果显示:在名义工况和变参数工况条件下,相比于被动悬架和传统史密斯模糊控制器,采用所提出史密斯-区间二型模糊控制器在降低车辆车身垂直加速度、悬架动挠度以及轮胎动位移和改善系统鲁棒性方面均取得理想的控制效果。下一步,将聚焦于磁流变半主动悬架在车辆防侧倾/侧翻等领域的应用研究,并计划采用半车模型和整车模型作为控制系统设计的研究载体,以期在更复杂的环境条件下,更真实地模拟并验证所提出控制策略的时滞补偿控制效果。
  • *国家自然科学基金(52205135)
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2025年第47卷第4期
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doi: 10.19562/j.chinasae.qcgc.2025.04.016
  • 接收时间:2024-08-26
  • 首发时间:2025-07-08
  • 出版时间:2025-04-25
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  • 收稿日期:2024-08-26
  • 修回日期:2024-11-05
基金
*国家自然科学基金(52205135)
作者信息
    浙江理工大学机械工程学院,杭州 310018

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王骏骋,特聘副教授,博士,E-mail:
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https://castjournals.cast.org.cn/joweb/qcygc/CN/10.19562/j.chinasae.qcgc.2025.04.016
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
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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