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学者姓名：杨晓东
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Abstract ：
Based on the different body configurations caused by varying head-to-tail distances exhibited by crawling inchworms during locomotion, this paper proposes a crawling-inchworm-type self-tuned dynamic vibration absorber (DVA) based on silicone gel materials for reducing low-frequency vibration. The proposed DVA was designed and developed by employing a magnetic hanging design with movable features, a span adjustment design with an embedded stepper motor, and a real-time control design using a microcontroller. First, a finite element simulation model was established to analyze the main structure of the self-tuned DVA using the finite element method. The frequency-shifting characteristics of the absorber were obtained by identifying the actuating modes that are sensitive to the hanging span. Second, based on the frequency-shifting characteristics of the self-tuned DVA, an absorber control system was designed by introducing a short-time Fourier transform and PID algorithm to achieve autonomous frequency adjustment of the DVA. Finally, the self-tuned absorption effects of the prototype self-tuned DVA were tested through a series of experiments, which confirmed its excellent self-tuned vibration absorption capability within the low-frequency range.
Keyword ：
crawling-inchworm-type dynamic vibration absorber crawling-inchworm-type dynamic vibration absorber silicone gel silicone gel vibration reduction vibration reduction self-tuned control self-tuned control variable stiffness variable stiffness
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| GB/T 7714 | Yang, Ji-Hou , Chen, De-Hai , Yang, Xiao-Dong . Design and experiment of a crawling-inchworm-type self-tuned dynamic vibration absorber based on silicone gel materials [J]. | JOURNAL OF VIBRATION AND CONTROL , 2024 . |
| MLA | Yang, Ji-Hou 等. "Design and experiment of a crawling-inchworm-type self-tuned dynamic vibration absorber based on silicone gel materials" . | JOURNAL OF VIBRATION AND CONTROL (2024) . |
| APA | Yang, Ji-Hou , Chen, De-Hai , Yang, Xiao-Dong . Design and experiment of a crawling-inchworm-type self-tuned dynamic vibration absorber based on silicone gel materials . | JOURNAL OF VIBRATION AND CONTROL , 2024 . |
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Abstract ：
Compared to the two-stage linear vibration isolator (TLVI), the two-stage quasi-zero stiffness (TQZS) system offers superior vibration isolation performance, making it a promising candidate for vibration isolation of precision instrument. However, the TQZS system exhibits a significant vibration amplitude due to its low dynamic stiffness. In this paper, a coupled (TQZS-UDVA) system consisting of a TQZS system and a dynamic vibration absorber (DVA) attached to the upper stage of the TQZS system is presented. The harmonic balance method is employed to obtain approximate analytical solution. The effects of system parameters on dynamic behavior and isolation performance are studied in detail. Five performance indexes are proposed, and based on these indexes, the damping and tuning stiffness of DVA are optimized. The results indicate that the integration of DVA effectively mitigates the vibration amplitude and extends the isolation frequency band, without compromising high-frequency performance.
Keyword ：
Two-stage nonlinear vibration isolation Two-stage nonlinear vibration isolation Parameter optimization Parameter optimization Dynamic vibration absorber Dynamic vibration absorber Quasi-zero stiffness Quasi-zero stiffness
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| GB/T 7714 | Xing, Zhao-Yang , Yang, Xiao-Dong . Parameter optimization of a two-stage quasi-zero-stiffness system with linear dynamic vibration absorber [J]. | NONLINEAR DYNAMICS , 2024 , 112 (14) : 11887-11907 . |
| MLA | Xing, Zhao-Yang 等. "Parameter optimization of a two-stage quasi-zero-stiffness system with linear dynamic vibration absorber" . | NONLINEAR DYNAMICS 112 . 14 (2024) : 11887-11907 . |
| APA | Xing, Zhao-Yang , Yang, Xiao-Dong . Parameter optimization of a two-stage quasi-zero-stiffness system with linear dynamic vibration absorber . | NONLINEAR DYNAMICS , 2024 , 112 (14) , 11887-11907 . |
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Abstract ：
Gyroscopic metamaterials integrate rotational units within periodic structures, enabling precise manipulation of mechanical waves and exhibiting programmable material properties. This study delves into the polarization characteristics of one-dimensional (1D) chains and two-dimensional (2D) networks of gyroscopic metamaterials, highlighting the ability to modulate the dispersion band structure through rotational elements. By leveraging dynamic tunability, we effectively tune the band gaps for polarized waves across a broad frequency range. Through wave polarization, we discover a Faraday-like rotation effect in linearly polarized mechanical waves. By adjusting the input frequency or the spin speed, the manipulation of the polarization plane and the polarization state can be achieved, effectively replicating the phenomena of an optical model in a mechanical system. We confirm that 2D rectangular and triangular unit-cell gyroscopic metamaterials can serve as tunable filtering and tunable polarizing components, respectively. Additionally, we utilize circularly polarized waves to achieve selective excitation, enabling waves at the same frequency to exhibit diverse propagation patterns. Experimental validation in 1D systems confirms the capability of manipulating wave propagation through the generated polarization. Our research establishes a framework for exploring gyroscopic metamaterials' capabilities in wave manipulation, fostering innovation in signal processing technologies.
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| GB/T 7714 | Qian, Ying-Jing , Wang, Yi-Bo , Yang, Xiao-Dong et al. Manipulation of circular polarization and mechanical waves in gyroscopic metamaterials [J]. | PHYSICAL REVIEW APPLIED , 2024 , 22 (5) . |
| MLA | Qian, Ying-Jing et al. "Manipulation of circular polarization and mechanical waves in gyroscopic metamaterials" . | PHYSICAL REVIEW APPLIED 22 . 5 (2024) . |
| APA | Qian, Ying-Jing , Wang, Yi-Bo , Yang, Xiao-Dong , Wang, Jiao , Yan, Yin-Zhou . Manipulation of circular polarization and mechanical waves in gyroscopic metamaterials . | PHYSICAL REVIEW APPLIED , 2024 , 22 (5) . |
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Abstract ：
本文利用ANSYS建立高保真铝合金桨叶模型,并利用Explicit Dynamics模块对该模型进行了高速冲击仿真,根据桨叶的实际工作情况选取了20种不同工况数据进行数值模拟。研究发现,铝合金桨叶的抗冲击性能有明显的速度效应,随着速度的增加出现了弹开、嵌入、贯穿三种侵彻状态。结果表明:铝合金桨叶主要依靠铝合金材料的变形、破碎吸能,且不同工况下抵抗冲击的性能不同。
Keyword ：
吸能 吸能 抗冲击性能 抗冲击性能 侵彻状态 侵彻状态 高速冲击 高速冲击
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| GB/T 7714 | 陈城卫 , 杨晓东 . 铝合金桨叶的高速冲击响应 [C] //北京力学会第二十九届学术年会论文集 . 2023 . |
| MLA | 陈城卫 et al. "铝合金桨叶的高速冲击响应" 北京力学会第二十九届学术年会论文集 . (2023) . |
| APA | 陈城卫 , 杨晓东 . 铝合金桨叶的高速冲击响应 北京力学会第二十九届学术年会论文集 . (2023) . |
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Abstract ：
对于估算折叠机翼的气动特性问题,使用升力面理论与涡格法进行计算,给出涡格法的计算公式,使用此方法分析折叠机翼在5°迎角、30m/s空速下升力系数、阻力系数与俯仰力矩系数随着折叠角度的变化规律。结果表明,随着折叠角的增大,升力系数与阻力系数减小,而俯仰力矩系数变大。
Keyword ：
涡格法 涡格法 气动特性 气动特性 折叠翼 折叠翼
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| GB/T 7714 | 付文昌 , 杨晓东 . 涡格法在折叠翼气动特性计算中的应用 [C] //北京力学会第二十九届学术年会论文集（续） . 2023 . |
| MLA | 付文昌 et al. "涡格法在折叠翼气动特性计算中的应用" 北京力学会第二十九届学术年会论文集（续） . (2023) . |
| APA | 付文昌 , 杨晓东 . 涡格法在折叠翼气动特性计算中的应用 北京力学会第二十九届学术年会论文集（续） . (2023) . |
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Abstract ：
变体飞行器是最近提出的一种新概念飞行器。其可根据飞行条件和飞行任务改变自身的气动构型,从而实现多种任务的切换。其中折叠翼飞行器十分受到大家的关注。本文建立了折叠机翼的结构和气动模型,将其合成为气动弹性模型以研究折叠角与后掠角对颤振频率和颤振速度的影响。通过与商业软件NASTRAN的对比以验证模型的正确性。结果表明折叠角度和后掠角度对于颤振速度来说是非常重要的因素,在设计和制造阶段要着重考虑。
Keyword ：
模态综合法 模态综合法 后掠角度 后掠角度 折叠角度 折叠角度
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| GB/T 7714 | 张竞宇 , 杨晓东 . 变体飞行器机翼建模与颤振分析 [C] //北京力学会第二十九届学术年会论文集 . 2023 . |
| MLA | 张竞宇 et al. "变体飞行器机翼建模与颤振分析" 北京力学会第二十九届学术年会论文集 . (2023) . |
| APA | 张竞宇 , 杨晓东 . 变体飞行器机翼建模与颤振分析 北京力学会第二十九届学术年会论文集 . (2023) . |
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Abstract ：
低频振动由于振幅大、振动能量高等特点,持续振动会引起结构失稳或机械设备的故障,实现低频有效控制成为近几年研究的热点问题。本文设计中引入刚度可调的简支梁动力吸振器,探究简支梁刚度变化理论确定吸振器的相关参数,通过有限元仿真模拟得到改变简支梁有效长度具有更宽的频率范围,通过调整边界条件控制吸振器等效刚度和共振频率。通过对仿真结果的分析,对模型进行进一步优化探究减振效果的显著变化。
Keyword ：
简支梁 简支梁 低频 低频 有限元仿真 有限元仿真 动力吸振器 动力吸振器
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| GB/T 7714 | 陈德海 , 杨晓东 . 简支梁式动力吸振器设计及仿真分析 [C] //北京力学会第二十九届学术年会论文集 . 2023 . |
| MLA | 陈德海 et al. "简支梁式动力吸振器设计及仿真分析" 北京力学会第二十九届学术年会论文集 . (2023) . |
| APA | 陈德海 , 杨晓东 . 简支梁式动力吸振器设计及仿真分析 北京力学会第二十九届学术年会论文集 . (2023) . |
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Abstract ：
本研究主要针对飞机螺旋桨叶片,本文利用ANSYS软件建立了螺旋桨叶片模型,并对其进行了单向流固耦合分析。为了研究螺旋桨叶片的应力应变特性,对不同转速的螺旋桨叶片的应力应变进行了计算。为研究螺旋桨叶片的振动特性,对不同材料、不同转速螺旋桨叶片进行了预应力模态分析。分析结果表明,螺旋桨叶片转速增加对于桨叶的模态频率影响较小,但是对于螺旋桨叶片的应力应变有着明显的影响,随桨叶转速的增加,桨叶所受应力增大,桨叶变形也随之增加;对于不同材料的桨叶,仿真结果表明复合材料具有降频率的作用。
Keyword ：
旋转叶片 旋转叶片 模态分析 模态分析 单向流固耦合 单向流固耦合 振动特性 振动特性
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| GB/T 7714 | 叶焱 , 杨晓东 . 螺旋桨叶片的流固耦合特性分析 [C] //北京力学会第二十九届学术年会论文集 . 2023 . |
| MLA | 叶焱 et al. "螺旋桨叶片的流固耦合特性分析" 北京力学会第二十九届学术年会论文集 . (2023) . |
| APA | 叶焱 , 杨晓东 . 螺旋桨叶片的流固耦合特性分析 北京力学会第二十九届学术年会论文集 . (2023) . |
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Abstract ：
The quasi-zero stiffness (QZS) system, as a typical high-static-low-dynamic-stiffness (HSLDS) system, is able to realize low frequency vibration isolation by introducing nonlinear negative stiffness. However, the nonlinearity of the system may result in a serious deterioration of the isolation performance under large amplitude excitation. In this paper, an inerter-based combined vibration isolation (IBCVI) system is proposed to overcome this problem. The IBCVI system consists of a QZS system and an inerter-based linear dynamic vibration absorber (IBDVA). The harmonic balance method is employed to obtain amplitude-frequency response of the IBCVI system, and the mechanism of IBDVA on vibration isolation system is revealed. Then the effects of system parameters on control performance are studied in detail. The results of the comparison with other models show that the presented model performs smaller vibration amplitude and wider isolation frequency band. This research provides a new insight into vibration isolation under large amplitude excitation from the perspective of vibration absorption.
Keyword ：
Dynamic vibration absorber Dynamic vibration absorber Quasi-zero stiffness Quasi-zero stiffness Nonlinear vibration isolation Nonlinear vibration isolation Inerter Inerter
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| GB/T 7714 | Xing, Zhao-Yang , Yang, Xiao-Dong . A combined vibration isolation system capable of isolating large amplitude excitation [J]. | NONLINEAR DYNAMICS , 2023 , 112 (4) : 2523-2544 . |
| MLA | Xing, Zhao-Yang et al. "A combined vibration isolation system capable of isolating large amplitude excitation" . | NONLINEAR DYNAMICS 112 . 4 (2023) : 2523-2544 . |
| APA | Xing, Zhao-Yang , Yang, Xiao-Dong . A combined vibration isolation system capable of isolating large amplitude excitation . | NONLINEAR DYNAMICS , 2023 , 112 (4) , 2523-2544 . |
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Abstract ：
Achieving vibration suppression or wave attenuation of tunable local resonance metamaterials without physical modification of the resonator has received a lot of attention recently. In this paper, a hybrid tunable metamaterial with a resonator containing a lever mechanism, an electromagnetic device, and a feedback system is proposed to achieve tunable bandgap and longitudinal wave attenuation. Unlike ordinary metamaterials, inertial amplification mechanisms and negative stiffness elements are involved in our proposed metamaterials. The function of the electromagnetic device and the feedback control are considered to theoretically derive the dispersion relation. The effective mass, the effective stiffness, the displacement transmission rate, and the band structure of the proposed metamaterial are analyzed, and the contributions of some key parameters on the bandgap are investigated. The accuracy of the analytical band structure is verified by the wave transmittance curves obtained by numerical simulation and the transient displacement response of a single oscillator. The results show that the proposed metamaterial yields broadband tunable bandgap in the low-frequency range, which enables the isolation of low-frequency longitudinal vibrations. This study provides a novel option for constructing integrated metamaterials to achieve vibration suppression and wave attenuation.
Keyword ：
Low-frequency vibration isolation Low-frequency vibration isolation Wave attenuation Wave attenuation Hybrid tunable bandgap Hybrid tunable bandgap Metamaterial Metamaterial
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| GB/T 7714 | Que, Wen-Zheng , Yang, Xiao-Dong . Longitudinal wave attenuation and bandgap analysis of a novel type hybrid tunable resonator metamaterial [J]. | ENGINEERING STRUCTURES , 2023 , 301 . |
| MLA | Que, Wen-Zheng et al. "Longitudinal wave attenuation and bandgap analysis of a novel type hybrid tunable resonator metamaterial" . | ENGINEERING STRUCTURES 301 (2023) . |
| APA | Que, Wen-Zheng , Yang, Xiao-Dong . Longitudinal wave attenuation and bandgap analysis of a novel type hybrid tunable resonator metamaterial . | ENGINEERING STRUCTURES , 2023 , 301 . |
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