Article
Engineering, Mechanical
Xiang Gao, Junchuan Niu, Lei He, Zhen Qin, Zhonglong Wang
Summary: In this study, a multi-dimensional vibration isolator based on a parallel mechanism with joint clearance is designed and analyzed to isolate the multi-dimensional vibration experienced by a vehicle-mounted precise facility. The kinematic and dynamic equations of the isolator with joint clearance are established, and the vibration isolation capability is explored through simulation and experimentation. The results demonstrate that the proposed isolator effectively inhibits multi-dimensional vibration, with the first-order resonance peak being sensitive to the increment in joint clearance.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Electrical & Electronic
Deniz Kavala Sen, Ahmet Yildiz, Osman Kopmaz
Summary: This paper investigates the structural design and controller optimization process for a five-bar planar manipulator using three population-based optimization techniques: particle swarm optimization, genetic algorithm, and differential evolution. The desired kinematic properties of the manipulator are determined using inverse kinematics, and an optimization problem is formulated to minimize shaking force and moments. The results demonstrate a significant reduction in shaking force and moment through optimal design parameters. Additionally, the controller is optimized to improve trajectory tracking accuracy. Comparison of the optimization methods shows that the genetic algorithm achieves the best results. Overall, these findings are of great importance for manufacturers designing a five-bar planar manipulator and its controller.
Article
Engineering, Electrical & Electronic
Hongfei Yu, Zhiqin Qian, Anil Borugadda, Wei Sun, Wenjun Zhang
Summary: This paper proposes a method to minimize the shaking moment of spherical parallel robots by combining counterweight and adjusting kinematic parameters. An approximate model is used for computational efficiency and the effectiveness of the approach is confirmed through simulation.
Article
Engineering, Mechanical
Matthijs J. J. Zomerdijk, Volkert van der Wijk
Summary: Industrial robotic manipulators in pick-and-place applications require short settling times to achieve high productivity. The use of a dynamically balanced inverted four-bar linkage can eliminate base vibrations and improve settling times.
Article
Chemistry, Multidisciplinary
Shenpeng Wang, Yan Cui, Chune Wang
Summary: A dynamic model of a compound pendulum jaw crusher with clearance is established using the Lagrange multiplier method based on the L-N contact force model and modified Coulomb friction force model. MATLAB and Adams comparison simulation are used to verify the correctness of the dynamic model and determine the best selection range of driving speed and clearance size according to the laminating crushing theory. The effects of driving speed and clearance size on the shock and chaos phenomenon in the clearance mechanism as well as the vibration force applied to the foundation are analyzed. The results show that increasing the driving speed and reducing the clearance size can weaken the shock and chaos phenomenon, improve the dynamic performance and operation stability, and prolong the service life of the foundation with the stability of vibration force. Furthermore, the optimal combination of driving speed and clearance size is determined, providing a theoretical basis for the optimization of the jaw crusher's vibration force.
APPLIED SCIENCES-BASEL
(2023)
Review
Engineering, Mechanical
Shuai Jiang, Tao Wang, Linjing Xiao
Summary: Irregular wear is one of the main reasons leading to the failure of mechanical equipment and mechanical parts. This study proposes a modeling and calculation method for planar multi-link mechanism considering multiple wearing clearances, and verifies the correctness of the theoretical model through experimental results.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Marine
Jianjun Huang, Guoping Chen
Summary: This study investigates the effects of wave conditions and structural geometry characteristics on wave loads for marine structures with a hybrid form of vertical wall with an overhanging slab. The research finds a nearly linear increase in impulsive force, quasi-static force, moment, and force-impulse with an increase in incident wave height. The uplift and horizontal impulsive forces and induced moments tend to first increase and then decrease as the normalized structural clearance increases, reaching a peak at c/Hs = 0.2. Additionally, the uplift impulsive force and moment increase while the horizontal impulsive force and moment decrease with an increase in the ratio of wave length to slab length. The study provides empirical formulas to account for the combined effects of wave conditions and structural geometry properties on wave loads, contributing to a better understanding of the quantitative impacts of different factors on vertical walls with overhang slabs.
Article
Mechanics
Jung-Hee Seo, Karthik Menon, Rajat Mittal
Summary: This study proposes a method to decompose the loading noise into components related to their generation mechanism and specific vortex structures. The method is applied to sound generation by a circular cylinder and loading noise generation by a pitching airfoil, showing its ability to identify dominant noise generation mechanisms and quantify the effect of vortex structures on noise generation.
Article
Metallurgy & Metallurgical Engineering
Yu-lei Hou, Yun-jiao Deng, Da-xing Zeng
Summary: This study established the dynamic model of a parallel mechanism with spherical joint clearance and investigated the dynamic response of the mechanism under wear and spherical joint clearance conditions. It was found that irregular wear can decrease the movement stability of the mechanism.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Engineering, Mechanical
Kai Wang, Hongjuan Yang, Han Wu, Shengfei Jiang
Summary: During the installation and operation of transmission equipment, bearing clearance problems are common and can lead to bearing failure. Research on bearing clearance is essential for understanding its impact on bearing vibration. Experimental observations indicate that small clearances result in periodic vibrations, while increasing clearances lead to chaotic vibrations.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Acoustics
Donovan du Toit, Brian Mace, Vladislav Sorokin, Lavesh Rughunanan
Summary: This study investigates the qualitative and quantitative behavior of undamped force-moment neutralisers relative to force only neutralisers, aiming to determine the parameters for maximizing bandwidth. Two physical mechanisms governing vibration suppression are identified: a phase condition and a magnitude condition. Results show that the proportional increase in bandwidth using an optimally tuned moment neutraliser in addition to a force neutraliser varies for different levels of attenuation.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
Guoguang Jin, Zhimin Wang, Dong Liang, Zhan Wei, Boyan Chang, Yang Zhou
Summary: An improved transitional lubrication model considering the roughness of the contact surface is established to research the dynamic response characteristics of the multi-link complex mechanism with lubricated clearance joint. The dynamic model of a six-bar rocking feeding mechanism with lubricated clearance joint is established, and the influence of dry friction clearance and lubricated clearance on the dynamic response of the mechanism are analyzed. The simulation results show that the driving speed, clearance size, and number of clearances have an impact on the dynamic characteristics of the mechanism.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Engineering, Mechanical
Zhang Hao, Meng Lingchao, Zhang Qiliang, Luo Zhong, Han Qingkai
Summary: The influence of clearance on the dynamic characteristics of the thrust-vectoring nozzle adjusting mechanism under different flight conditions is studied in this research. A dynamic model considering the clearance and friction properties of the motion joint is constructed, and the variation law of nonlinear contact stiffness is explored. The simulation results reveal that the motion joint's clearance causes vibrations in the early operation but has minimal effect on the precision of blade motion in the stable phase.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Mechanical
Chao Lin, Yu Wang, Yanan Hu, Yongquan Yu
Summary: A comprehensive dynamic model considering nonlinear parameters was proposed for the curved-face gear pair, revealing complex dynamic responses influenced by configuration and parameter conditions. The system state alternated between chaotic motion and periodic motion with the increase of meshing frequency.
JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Wenbing Tu, Wennian Yu, Yimin Shao, Yinquan Yu
Summary: This paper presents a dynamic model for investigating the vibration response of a cylindrical roller bearing considering skidding, which improves previous models. It is found that skidding may cause fluctuations and a significant increase in friction force, affecting the bearing's vibration response.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Selcuk Erkaya, Selim Dogan, Saban Ulus
MECHANISM AND MACHINE THEORY
(2015)
Article
Engineering, Mechanical
Selcuk Erkaya, Selim Dogan
NONLINEAR DYNAMICS
(2015)
Article
Engineering, Environmental
Selcuk Erkaya, Abdurrahman Geymen, Bulent Bostanci
JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE AND ENGINEERING
(2015)
Article
Engineering, Mechanical
Selcuk Erkaya, Selim Dogan, Emrah Sefkatlioglu
MECHANISM AND MACHINE THEORY
(2016)
Article
Engineering, Mechanical
Selcuk Erkaya
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2018)
Article
Engineering, Mechanical
Selcuk Erkaya
MECHANISM AND MACHINE THEORY
(2018)
Article
Engineering, Mechanical
Selcuk Erkaya
STROJNISKI VESTNIK-JOURNAL OF MECHANICAL ENGINEERING
(2018)
Article
Multidisciplinary Sciences
Hamdi Taplak, Selcuk Erkaya, Sahin Yildirim, Ibrahim Uzmay
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2014)
Article
Engineering, Mechanical
Selcuk Erkaya, Ibrahim Uzmay
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2014)
Article
Engineering, Multidisciplinary
Selcuk Erkaya
Article
Mechanics
Selcuk Erkaya
MULTIBODY SYSTEM DYNAMICS
(2019)
Article
Engineering, Mechanical
Saeed Khorashadizadeh, Seyed Mohammad Hashem Zadeh, Mohammad Reza Koohestani, Sajjad Shekofteh, Selcuk Erkaya
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2019)
Article
Acoustics
Saban Ulus, Selcuk Erkaya
INTERNATIONAL JOURNAL OF ACOUSTICS AND VIBRATION
(2016)
Proceedings Paper
Engineering, Mechanical
S. Yildirim, S. Erkaya
NEW TRENDS IN MECHANISM AND MACHINE SCIENCE: FROM FUNDAMENTALS TO INDUSTRIAL APPLICATIONS
(2015)
Proceedings Paper
Engineering, Mechanical
S. Erkaya
NEW TRENDS IN MECHANISM AND MACHINE SCIENCE: FROM FUNDAMENTALS TO INDUSTRIAL APPLICATIONS
(2015)
