Article
Engineering, Mechanical
Cheng Yang, Dayi Zhang, Qicheng Zhang, Zhenyao Zhao, Zhenkun Zeng
Summary: A theoretical model of an elastic supported rotor system under blade off impact is proposed, considering the gyroscopic moment and local plastic deformation. The model extends the impact model of a non-rotating beam to a rotating beam and analyzes the influence of various factors on the propagation of impact energy in the rotor. It is found that gyroscopic moment can suppress wave propagation and increasing cross-section size improves the plastic limit bending moment.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Aerospace
Prabhat Kumar, Rajiv Tiwari
Summary: This paper proposes a novel trial misalignment approach for estimating misalignment in rotating machinery to ensure safe operation. By establishing a mathematical model and conducting experiments, unknown misalignments can be evaluated and estimated.
PROPULSION AND POWER RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Haobo Wang, Yulai Zhao, Zhong Luo, Qingkai Han
Summary: This paper investigates the influence of SFD on the vibration of aeroengine rotor systems. The results show that under high speed and small unbalance, SFD can cause complex or bistable vibrations. However, increasing the unbalance can convert the rotor vibration into single-harmonic, eliminating bistable vibrations.
APPLIED SCIENCES-BASEL
(2022)
Article
Automation & Control Systems
Peiling Cui, Liang Du, Xinxiu Zhou, Jinlei Li, Yanbin Li, Yang Wu
Summary: This article proposes a modified Dual-Channel Notch Filter (DNF) to suppress the synchronous vibration moment in a magnetically suspended control moment gyro. By modeling the rotor system and designing the DNF, it is proven that this method can effectively eliminate vibration moments.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Automation & Control Systems
Peiling Cui, Liang Du, Xinxiu Zhou, Jinlei Li, Yanbin Li, Yang Wu
Summary: This study introduces a modified dual-channel notch filter (DNF) to suppress the synchronous vibration moment in a magnetically suspended control moment gyro. Simulation results demonstrate that this method can effectively eliminate the synchronous vibration moment in the rotor system.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Mathematics
Jing Lu, Hongjun Chai, Ruchun Jia
Summary: This study presents a universal framework for flight maneuver recognition, which can be applied to various flight tasks. By preprocessing, reconstructing, and calculating entropy, it can accurately identify different types of flight maneuvers for multiple aircraft types.
Article
Engineering, Civil
Edmond Q. Wu, MengChu Zhou, Pengwen Xiong, Zhi-Ri Tang, Ruihan Hu, Yu-Wen Jie
Summary: The study introduces a SGPN model to analyze the relationship between flight performance and multi-physiological parameters, improving learning efficiency with an auxiliary variable strategy and achieving a sparse model. The model solves complex nonlinear relationships through variational approximate inference.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Engineering, Civil
Edmond Q. Wu, Zhengtao Cao, Poly Z. H. Sun, Dongfang Li, Rob Law, Xin Xu, Li-Min Zhu, Mengsun Yu
Summary: This work proposes an adversarial Bayesian deep network for cognitive detection of pilot fatigue. Batch normalization and data enhancement are used to improve the generalization of neural networks, and a generator is employed to enhance the accuracy of fatigue state recognition. Adversarial noise is added near each brain electrode to reveal the correlation between cognitive state and brain region location.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Acoustics
Dyah Kusuma Dewi, Zainal Abidin, Bagus Budiwantoro, Jhon Malta
Summary: This paper is focused on studying scale-fullscale models of rotor-bearing systems on rotating conditions. The gyroscopic effect causing forward and backward whirl frequencies is investigated. The experimental study validates the scaling factor of whirl frequencies and the impact of the gyroscopic effect on the first bending natural frequency. The findings have important implications for engineers in the implementation of scaling methods in rotating machinery design.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Mechanical
Karimulla Shaik, B. K. Dutta
Summary: The paper discusses the stability of a flexible rotor on a horizontal rigid bearing, highlighting the impact of factors such as shaft flexibility, damper support flexibility, damper mass, and turbulence on stability. Insertion of turbulence decreases stability thresholds.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Jiyin Tian, Chang Zhang, He Liang, Dan Guo
Summary: The paper proposed a dynamic model including thermo-elastohydrodynamic lubrication (TEHL) to investigate high-speed angular contact ball bearings. The results showed that the gyroscopic moment of the ball increased with higher load under constant axial load, and that sliding speed and film temperature significantly increased with a sudden decrease in axial load due to friction moment decline.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Wujiu Pan, Xianmu Li, Liangyu Ling, Haoyong Qu
Summary: In this study, a rotor system model considering various nonlinear factors was established using the finite element method. The dynamic responses of the system under different conditions were analyzed in detail, and it was found that the oil film clearance had the greatest influence on the rub-impact response of the system, followed by the bearing clearance, while the rub-impact stiffness had the least influence.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Acoustics
Donglai Yang, Xingrong Huang
Summary: This paper presents a fast and efficient numerical scheme based on nonlinear modal analysis for analyzing the dynamic behavior of rotor systems. The proposed strategy takes into account the gyroscopic effect and dry friction caused by part looseness. The study reveals the relationship between modal parameters such as resonance frequencies and modal damping ratios with rotation speed and modal amplitude.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Markus Hutterer, Manfred Schrodl
Summary: Designing a controller for a magnetically stabilized rotor requires careful attention to the rotordynamic behavior, control design, and characteristics of the actuator and sensors. This article connects the synthesis of the current free controller and the position controller using the 0-framework. The rotor is modeled using finite element method and the flexible system is reduced for control design. The proposed controller has a low system order and considers the parameter variant nature of the plant.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Aerospace
Hao Li, Yuping Li, Zhongliang Zhao, Xiaobing Wang, Haiyong Yang, Shang Ma
Summary: Studying serious nonlinear coupling problems among aerodynamics, flight mechanics, and flight control during high maneuvers. Developed a virtual flight testing platform that can simulate real maneuvers, investigate coupling characteristics, evaluate flight performance, and verify flight control laws.
Article
Engineering, Mechanical
Antonella Castellano, Pietro Stano, Umberto Montanaro, Marco Cammalleri, Aldo Sorniotti
Summary: This paper proposes a new control strategy for hybrid electric vehicles, called Model Predictive Control (MPC), and considers the losses in transmission gears. Through a case study on Chevrolet Volt, the results show that the simplified internal model has a minor impact on fuel consumption performance.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Rui Peng, Gregory S. Chirikjian
Summary: This article introduces a method of designing morphable thick-panel origami structures using reconfigurable linkages, which improves the potential of origami techniques for different tasks and solves the limitations of one-DOF and multiple-DOF folding structures.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Gaohan Zhu, Weizhong Guo, Yinghui Li, Youcheng Han
Summary: Comprehensive and accurate performance evaluation is crucial for profile synthesis and analysis of higher pair mechanisms. This paper proposes evaluation indices and methods for the transmission performance of planar higher pair mechanisms from different perspectives. It subdivides the transmission performance into element-based performance and joint-based performance and develops novel indices specific to higher pair mechanisms. A graphical mapping method based on element-based performance is also proposed for intuitive analysis. Practical examples validate the effectiveness of the proposed indices and methods for evaluating the performance of higher pair mechanisms.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Ke Wu, Gang Zheng, Guimin Chen, Shorya Awtar
Summary: Researchers proposed a new modeling method, namely Body-frame Beam Constraint Model (BBCM), to predict and optimize the design of high-precision compliant mechanisms (CMs).
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Youcheng Han, Weizhong Guo, Changjie Zhao, Ziyue Li, Ze Fu, Yinghui Li
Summary: This study proposes a structural synthesis methodology that considers motion, force, and energy characteristics simultaneously to design efficient mechanisms.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Cristian Enrico Capalbo, Daniel De Gregoriis, Tommaso Tamarozzi, Giuseppe Carbone, Domenico Mundo
Summary: This study proposes a novel flexible multibody formulation that enables efficient updating of models while maintaining small size and high accuracy. Numerical validation demonstrates its wide applicability across various materials and mechanisms, showing promising results in terms of accuracy.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Weihao Zhao, Junbei Liao, Wei Qian, Haoyong Yu, Zhao Guo
Summary: This paper presents a newly designed compliant actuator using a tensile springs array to address the challenges in achieving linear and consistent elastic properties, low friction, minor hysteresis, and good compliance in series elastic actuators (SEA). The unique geometry of the spring array enables the SEA to have consistent rotary stiffness with minimal friction and hysteresis. The device's performance is evaluated using PID and sliding mode control, demonstrating its constant low rotary stiffness and torque tracking bandwidth, making it suitable for human-robot interaction requirements.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Mohui Jin, Yukang Luo, Xing Xu, Bowei Xie, Weisheng Wang, Zewei Li, Zhou Yang
Summary: This paper presents a method for evaluating the contact interaction between compliant mechanisms and external objects. By establishing a numerical model and introducing contact springs to describe the contact forces, the deformation and normal contact force/stress can be accurately calculated. The static equilibrium configuration and contact force/stress can be obtained by minimizing the total potential energy function of the system.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Alejandro G. Gallardo, Martin A. Pucheta
Summary: This paper presents a method for the synthesis of parallel flexure systems using Screw Theory and Linear Algebra. The method is validated through three case studies and offers a simple and precise design with decoupled actuators.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Xiao Wang, Chenglin Liu, Haoxiang Sun, Hanwen Song
Summary: This paper presents a new decomposition mode for robot-world calibration, which decomposes the Ad(SE(3)) equation using Chasles' motion. A two-step method based on point set matching is proposed. The superiority of this method is verified through simulations and experiments.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Yanlin Chen, Xianmin Zhang, Yanjiang Huang, Yanbin Wu, Jun Ota
Summary: This study establishes an error model for a 3-RRR+UR spherical parallel mechanism and analyzes the sensitivity of error parameters. A design structure is proposed to reduce input errors based on the analysis. Experimental results show that the multiloop circuit incremental method provides more accurate results.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Vu Linh Nguyen, Chin-Hsing Kuo, Po Ting Lin
Summary: This paper presents a method for analyzing the performance of gravity-balanced serial robotic manipulators under dynamic loads and uses a three-degree-of-freedom planar serial manipulator as a case study. The significance of this method is demonstrated by evaluating the impact of dynamic loads on gravity-balanced performance and proposing a step-by-step design procedure to improve it.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Shifeng Rong, Jiange Zhang, Xing Zhang, Keliang Li, Kaibin Rong, Zhenyu Zhou, Han Ding
Summary: This article proposes a data-driven dry cutting tool collaborative optimization model to improve the economic and environmental attributes of facehobbing hypoid gears. An innovative ease-off tooth contact analysis method is introduced to establish accurate relations between ease-off flank and loaded contact performance evaluations. The proposed model significantly improves sustainability in terms of economic and environmental assessments.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Kemal Eren, Soley Ersoy, Ettore Pennestri
Summary: This research investigates the instantaneous kinematics of the terminal link of a planar two-link open chain using the complex-number technique and higher-order instantaneous invariants.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Bo Han, Zhantu Yuan, Jiachuan Zhang, Yundou Xu, Jiantao Yao, Yongsheng Zhao
Summary: This paper proposes novel deployable mechanism units with self-limiting position function, and constructs ring truss deployable mechanisms. The degrees of freedom (DOF) of deployable units are analyzed and it is proved that the constructed ring truss deployable mechanisms have only one DOF. The dynamic model of the deployable mechanism unit with passive actuation is established and verified by simulation. The deployable mechanism units proposed in this paper have the advantages of good scalability and stability, and have broad application prospects.
MECHANISM AND MACHINE THEORY
(2024)