Article
Engineering, Mechanical
Yongliang Yuan, Jianji Ren, Zhenxi Wang, Xiaokai Mu
Summary: This study considers the dynamic performance of the excavator, as well as its trajectory, stress distribution, and vibration. A rigid-flexible coupling model of the excavator attachment is established and studied. The results show that the number of flexible bodies has little effect on the excavation trajectory, and the dynamic performance of the excavator is greatly influenced by the clearance.
FACTA UNIVERSITATIS-SERIES MECHANICAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Jialiang Sun, Zhengzheng Cai, Jiahao Sun, Dongping Jin
Summary: This paper studies the influence of control moment gyroscopes (CMGs) on the dynamic responses and characteristics of an inflatable space structure. The large deformations and motions of the inflatable tubes and rigid satellites are accurately described using the absolute nodal coordinate formulation (ANCF) and the natural coordinate formulation (NCF) respectively. A detailed rigid body dynamic model of the CMG is proposed, which can be attached to and coupled with any flexible body. The orbital dynamic equations of the inflatable space structure coupled with distributed CMGs are derived and the dynamic characteristics are analyzed.
NONLINEAR DYNAMICS
(2023)
Article
Chemistry, Analytical
Sunil Kumar Sharma, Rakesh Chandmal Sharma, Jaesun Lee, Hong-Lae Jang
Summary: This paper examines the influence of dynamic vibration absorber (DVA) on the vertical vibrations of high-speed vehicle's car body. Mathematical and dynamic models are developed to investigate the effect of equipment mass, suspension parameters, and mounting location on car body's flexible vibrations. The analysis shows that DVA theory is effective in reducing flexible vibrations of the car body.
Article
Engineering, Aerospace
Jie Wu, Yijiang Ma, Zhidong Wang, Zhihao Yu
Summary: This paper proposes a new rigid-flexible structural model for studying the coupling effects in helicopter rotor systems. By introducing a coupling factor, the coupling characteristics can be quantified. Simulations show that the new structural model is capable of solving static and dynamic problems, and predicting the maximum deformation range.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Energy & Fuels
Chenyang Zhang, Hongzhou Jiang
Summary: The study revealed that the problems encountered in previous hydraulic 6-DOF parallel mechanism projects are mainly caused by the flexible modes of the step-seals, and adopting seals with less elasticity is necessary to maintain the dynamic characteristics of the mechanism.
Article
Nanoscience & Nanotechnology
Zhenrong Tan, Chang Geun Yoo, Dongjie Yang, Weifeng Liu, Xueqing Qiu, Dafeng Zheng
Summary: This study reports a sustainable and facile strategy for constructing lignin/cellulose aerogels with low density, high mechanical strength, and excellent elasticity, which have a wide potential for applications in various fields.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Jinmei Song, Xiaopeng Feng, Haotong Wei, Bai Yang
Summary: This study reports on the modulation of supramolecular interactions by fluorination to alleviate microstrain in 2D perovskite materials, thus improving device performance. In the organic spacer, interlayer supramolecular interactions between fluorine atoms and benzene rings can maximally release compressive forces on the inorganic octahedron skeleton, leading to enhanced stability.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Mechanical
Xiao Yang, Yaguo Lei, Huan Liu, Bin Yang, Xiang Li, Naipeng Li
Summary: Compound multistage gearing systems are widely used in rotating machinery to provide high speed-reduction ratios and heavy load capacity. The modeling and characterization of these systems can provide valuable insights for design and fault diagnosis. However, there are challenges in modeling due to the complex interactions among gear systems and the flexibility of gears and shafts.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Computer Science, Information Systems
Reina Ishikawa, Ryo Hachiuma, Hideo Saito
Summary: The key to accurate understanding of terrain lies in extracting informative features from multi-modal data obtained from various sensors. In this study, a novel framework was proposed using a multi-modal variational autoencoder and Gaussian mixture model clustering algorithm to cluster terrain types using image and audio data, even when one modality is missing at test time. The effectiveness of the approach was demonstrated through evaluation and ablation studies.
Article
Chemistry, Physical
Yee-Kwong Leong, Pengfei Liu, Jishan Liu, Peta Clode, Weian Huang
Summary: Composite NaMnt (SWy-2)-kaolin (KGa-2) gels with more than 10 wt% solids and a NaMnt fraction of 20% exhibit an open cellular microstructure. The flexible nanosized NaMnt platelets form a continuous structure with dispersed kaolin particles, resulting in various unique particle interaction configurations. The study also reveals the thixotropic and rheopectic behaviors of a 15.5 wt% gel with a 1:2 mass ratio of NaMnt to kaolin. Evaluation of the gel's structural development kinetics and aging behavior further provide insights into the formation process of continuous structures. Rating: 8/10.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Robotics
Hitoshi Kimura, Mokutaro Kataoka, Norio Inou
Summary: In this study, a flexible mobile robot named MOLOOP is proposed to address the issue of conventional robots getting stuck in narrow spaces. By improving the performance of the crawler, the driving force, traveling speed, and size of the robot are enhanced. The results demonstrate that the new crawler and valve design enable the robot to successfully navigate through narrow terrains.
JOURNAL OF ROBOTICS AND MECHATRONICS
(2022)
Article
Engineering, Electrical & Electronic
Renfeng Zhu, Guilin Yang, Zaojun Fang, Chin-Yin Chen, Huamin Li, Chi Zhang
Summary: This study presents a closed-form dynamic model for a 2R1T parallel kinematic mechanism (PKM) with a hybrid rigid-flexible structure for force-control applications. A symbolic formulation approach is proposed to establish closed-form kinematic models for both forward and inverse kinematics analysis, based on the 3PPS kinematic configuration of the PKM. The closed-form dynamic model considers the stiffness and deformation of the flexure-based passive prismatic joints and has been validated using commercial dynamic simulation software.
Article
Acoustics
Yoonsoo Lee, Sinwoo Jeong, Hong Hee Yoo
Summary: A novel linear dynamic model is proposed for accurately considering the two-way inertia coupling effect between a rigid shaft and flexible beam, and accurately determining the modal characteristics of the coupled system.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Yongzhi Jiang, Pingbo Wu, Jing Zeng, Xingwen Wu, Yunchang Zhang, Zhenhuan Yang, Runjia Gao, Xinliang Dai
Summary: This paper introduces a new type of suspended monorail developed in China, and the study shows that the resonance of the vehicle system may be caused by the span of the stiffeners, and the vibration modes of the bridge are easily excited at specific frequency ranges when the vehicle passes through.
VEHICLE SYSTEM DYNAMICS
(2021)
Article
Chemistry, Multidisciplinary
Hanseob Kim, Ghazanfar Ali, Andreas Pastor, Myungho Lee, Gerard J. Kim, Jae-In Hwang
Summary: Our study introduces a method using the dynamic silhouette of real objects to achieve realistic interactions in an augmented reality environment, which is more practical and lightweight compared to common AR applications on the market, and requires no additional hardware support.
APPLIED SCIENCES-BASEL
(2021)
