...Wenjie Zhu; Rongyong Zhao; Hao Zhang; Cuiling Li; Ping Jia; Yunlong Ma; Dong Wang; Miyuan Li Understanding the effects of panic on crowd dynamics in emergency situations has long been considered necessary for pedestrian evacuation control. In the case of disasters, stampedes caused by panic...

...Andras Bartfai; Asier Barrios; Zoltan Dombovari This study is interested in the stability of robots in machining. The goal is to improve the dynamic performance of robots using an additional acceleration signal fed back through the conventional built-in proportional-derivative controller provided...

... to represent rigid body configurations. e-mail:  a.mueller@jku.at 10 10 2021 16 12 2021 08 03 2022 multibody systems rigid body kinematics dynamics absolute coordinates numerical integration lie group integration singularities invariants Complex multibody systems...

..., then the multidegree-of-freedom torsional vibrations model and nonlinear dynamic model of the drill string are established. Combined with the actual working conditions in the drilling process, the stick–slip reduction mechanism of the drill string is studied. The research results show that the higher rotational speed...

..., we present new recursive formulas for computing partial derivatives of the kinetic energy. This enables us to solve the inverse dynamics problem of the discrete system with linear computational complexity. The resulting algorithms are easy to implement and can naturally be applied to a very broad...

...Nicholas Candelino; Nader Jalili There have been a variety of attempts to model the quasi-static and high energy impact dynamics of vertically aligned carbon nanotube (VACNT) pads. However, very little work has focused on identifying the behavior at the midlevel frequencies that may occur...

...Samuel Jung; Tae-Yun Kim; Wan-Suk Yoo Dynamic relaxation (DR) is the most widely used approach for static equilibrium analyses. Specifically, DR compels dynamic systems to converge to a static equilibrium through the addition of fictitious damping. DR methods are classified by the method in which...

...: wheel–rail rigid contact. Unlike most of the dynamic models, where the interconnections between the vehicle and the track entirely depend on the wheel–rail contact forces, the subsystems of the vehicle and the tracks in the present study are effectively united as an entire system with interactive...

... are different, the results obtained by them are identical completely. Besides the two external signals excitation case, the validity of the new proposed method is also verified in the system that is excited by an amplitude modulated signal. Further, the dynamics of the system reveals that the resonance...

... January 10, 2018. Assoc. Editor: Katrin Ellermann. 08 03 2017 02 12 2017 Computational kinematics Control Design optimization Nonlinear dynamical systems Stability Structural dynamics Vehicular dynamics Dynamical analysis Dynamics Stability of nonlinear systems Dynamical...

...Chandan Bose; Vikas Reddy; Sayan Gupta; Sunetra Sarkar This paper deals with the nonlinear fluid structure interaction (FSI) dynamics of a Dipteran flight motor inspired flapping system in an inviscid fluid. In the present study, the FSI effects are incorporated to an existing forced Duffing...

...Jianhong Hou; Guofeng Yao; Huili Huang In this paper, the dynamic response of a spatial four-bar mechanism with a spherical clearance joint with flexible socket is investigated. Previous research treats the socket as a whole rigid part and neglects the flexibility of the socket. In order to better...

...Hao Zhu; Weidong Zhu; Yumei Hu; Xuefeng Wang A complete dynamic model of a timing belt drive system with an oval cogged pulley and an auto-tensioner is established in this work. Periodic torsional vibrations of all accessory pulleys and the tensioner arm are calculated using a modified incremental...

... Computational kinematics Flexible-cody dynamics Parameter estimation System identification Numerical Dynamics Integration methods In the analysis of the machine tool spindle units, it is important to consider all components of the machine (see Ref. [ 1 ] for an overview). When simulating...

... April 3, 2017; final manuscript received June 19, 2017; published online October 31, 2017. Assoc. Editor: Dan Negrut. 03 04 2017 19 06 2017 Computational kinematics Computational mechanics Flexible-cody dynamics Multibody system dynamics Dynamics In multibody system (MBS...

.... As a result, the parameter space is divided into different regions showing dynamically relevant responses of the model, with special interest on the influence of the mass and angular velocity of the drill-string system. In particular, the study reveals the coexistence of various types of whirling motion...

... and another rack or a wall must be avoided. Therefore, it is necessary for designing an FS rack to figure out how it moves under seismic excitation. In this research, a dynamic model of an FS rack is developed considering seismic inertial force, friction force, and fluid force. This model consists of two...

... YNAMICS . Manuscript received January 30, 2017; final manuscript received May 26, 2017; published online July 12, 2017. Assoc. Editor: Zaihua Wang. 30 01 2017 26 05 2017 Algorithms Computational kinematics Fractional calculus Nonlinear dynamical systems Nonlinear instabilities...

.... 5 Nonlinear amplitude frequency responses of the stacking sequence (−45 deg/45 deg/−45 deg/45 deg/−45 deg/45 deg/−45 deg/45 deg) composite beam with Reddy model when ω is near ω l /3 for different values of loss factor η 1 Nonlinear dynamic analysis of multilayered composite beams...

... . Manuscript received November 6, 2016; final manuscript received April 11, 2017; published online May 17, 2017. Assoc. Editor: Anindya Chatterjee. 06 11 2016 11 04 2017 Dynamics MEMS Experimental dynamics Multibody system dynamics Nonlinear oscillations Nonlinear phenomena Vibration...