Modeling and analysis of dynamic behavior of tilting vehicle

2007 ◽  
Author(s):  
Rodrigo de Souza Vieira ◽  
Rafael Sangoi Padilha ◽  
Lauro Cesar Nicolazzi ◽  
Nestor Roqueiro
Keyword(s):  
Dynamic Behavior ◽  
Modeling And Analysis

On the Mittag–Leffler Stability of Impulsive Fractional Solow-Type Models

2017 ◽  
Vol 18 (5) ◽  
pp. 315-325 ◽  
Author(s):  
Ivanka M. Stamova ◽  
Gani Tr. Stamov
Keyword(s):  
Fractional Calculus ◽  
Dynamic Behavior ◽  
Fractional Order ◽  
Sufficient Conditions ◽  
Mathematical Finance ◽  
Financial Systems ◽  
Modeling And Analysis ◽  
Modeling Approach ◽  
Suitable Tool ◽  
Impulsive Perturbations

AbstractIn this article, we introduce fractional-order Solow-type models as a new tool for modeling and analysis in mathematical finance. Sufficient conditions for the Mittag–Leffler stability of their states are derived. The main advantages of the proposed approach are using of fractional-order derivatives, whose nonlocal property makes the fractional calculus a suitable tool for modeling actual financial systems as well as using of impulsive perturbations which give an opportunity to control the dynamic behavior of the model. The modeling approach proposed in this article can be applied to investigate macroeconomic systems.

scholarly journals Modeling and analysis of the dynamic behavior of the XlnR regulon in Aspergillus niger

2011 ◽  
Vol 5 (Suppl 1) ◽  
pp. S14 ◽  
Author(s):  
Jimmy Omony ◽  
Leo H de Graaff ◽  
Gerrit van Straten ◽  
Anton J B van Boxtel
Keyword(s):  
Aspergillus Niger ◽  
Dynamic Behavior ◽  
Modeling And Analysis

Numerical Modeling and Analysis of Flexure-Pivot Tilting-Pad Bearing

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Junho Suh ◽  
Alan Palazzolo ◽  
Yeon-Sun Choi
Keyword(s):  
Dynamic Behavior ◽  
Reynolds Equation ◽  
Critical Role ◽  
Three Dimensional ◽  
The Novel ◽  
Fe Method ◽  
Fluid Force ◽  
Modeling And Analysis ◽  
Ehd Lubrication ◽  
Fluid Film Thickness

This paper presents a new approach for modeling flexure-pivot journal bearings (FPJB) employing a three-dimensional (3D) elasto-hydro-dynamic (EHD) lubrication model. The finite element (FE) method is adopted for an analysis of the (1) pad-pivot dynamic behavior and the (2) fluid force. The isoviscosity Reynolds equation is utilized to calculate the fluid force acting on a flexure-pivot pad bearing and spinning journal. Computational efficiency is achieved utilizing modal coordinate transformation for the flexible pad-pivot dynamic analysis. Fluid film thickness plays a critical role in the solution of Reynolds equation and is evaluated on a node-by-node basis accounting for the pad and web deflections. The increased fidelity of the novel modeling approach provides rotating machinery designers with a more effective tool to analyze and predict rotor–bearing dynamic behavior.

The Influence of Tread Hollowing of the Railway Wheels on the Hunting of a Coach

2010 ◽  
Author(s):  
H. Tavakkoli ◽  
R. Ghajar ◽  
J. Alizadeh K.
Keyword(s):  
Dynamic Behavior ◽  
Plastic Flow ◽  
Lateral Displacement ◽  
Main Topic ◽  
Surface Material ◽  
Wheel Surface ◽  
Modeling And Analysis ◽  
Railway Wheel ◽  
Railway Wheels

A railway wheel has subjected to millions of intense wheel-rail contact cycles in its lifetime. Due to these severe contacts, wheel surface has worn gradually to a hollow shape. Also, tread hollowing rarely has occurred by plastic flow of surface material. Tread hollowing major consequences are false flange and different rolling radius of the wheels on a wheelset. False flange queers vehicle steerage and rolling radius differences can advance vehicle instability. This paper investigates the effect of tread hollowing, in the form of false flange and rolling radius difference, on the dynamic behavior of a railway coach. Modeling and analysis of the coach equipped by hollow wheels is performed using Adams Rail software. This study is conducted following on the problem appeared after operation of the newly purchased passenger coaches by the Iranian railways. So, the main topic which is focused on is the lateral displacement of the coach. Finally, results are reported and compared to achieve a proper criterion for tread hollowing.

scholarly journals Time-Domain Dynamic Modeling and Analysis of Complex Heavy-Duty Gearbox Considering Floating Effect

2021 ◽  
Vol 11 (15) ◽  
pp. 6876
Author(s):  
Jiulin Wu ◽  
Yifan Zhou ◽  
Wei Jiang ◽  
Xuedong Chen
Keyword(s):  
Dynamic Behavior ◽  
Time Domain ◽  
Planetary Gear ◽  
Modeling Method ◽  
Torsional Stiffness ◽  
Heavy Duty ◽  
Wind Turbine Gearbox ◽  
Modeling And Analysis ◽  
Meshing Gears ◽  
The Time Domain

Expert insights into the time-domain dynamic behavior of heavy-duty gearboxes form the foundations of design evaluation and improvement. However, in the existing lateral–torsional coupling (LTC) modeling method for gearboxes that is normally used for frequency-domain dynamic behavior, the meshing forces are modeled as spring dampers with fixed acting points on the meshing gears to simulate only the transient LTC effect, and thus the steady state characteristic in the time domain cannot be obtained due to the unrealistic distortion of positions and orientations as the gear angles increase. In this paper, a novel and generally applicable LTC modeling method for heavy-duty gearboxes, mainly planetary gear sets with floating components, is proposed by using space-fixed spring dampers with floating acting points on the meshing gears to study the time-domain dynamic response and to support the dynamic design of heavy-duty gearboxes. Based on the proposed method, a LTC model of a 2 megawatt (MW) wind turbine gearbox with floating components considering the time-varying meshing stiffness, bearing stiffness, torsional stiffness, and floating effect was established. The simulated results of representative components were in accordance with experimental results on a test rig, and dynamic behavior was calculated.

Modeling and Analysis of Electro Hydraulic Brake System Based on AMESim/Matlab

2011 ◽  
Vol 383-390 ◽  
pp. 1994-1999 ◽  
Author(s):  
Zhi Lin Jin ◽  
You Qun Zhao ◽  
Rui Kang Shi ◽  
Li Shu Guo ◽  
Zheng Tang Shi
Keyword(s):  
Dynamic Model ◽  
Dynamic Behavior ◽  
Dynamic Characteristics ◽  
Single Neuron ◽  
Active Safety ◽  
Modeling And Analysis ◽  
Hydraulic Brake ◽  
Working Principle ◽  
Single Neuron Pid ◽  
Vehicle Active Safety

Electro Hydraulic Brake (EHB) system plays an important role for improving vehicle active safety. In this paper, the dynamic behavior of EHB system is discussed. From its working principle, a dynamic model of quarter EHB system is established based on AMESim and Matlab. To analyze performance of the proposed EHB system, the strategy of Single-Neuron PID regulation is presented and a typical numerical case is given. The results show that this strategy can obtain good performance and proper parameters can improve the dynamic characteristics of EHB system effectively.

Dynamics Modeling and Analysis of Multi-Point Ejection Mode of Space Nets System

2015 ◽  
Vol 775 ◽  
pp. 3-8
Author(s):  
Qing Yu Gao ◽  
Qian Gang Tang ◽  
Qing Bin Zhang ◽  
Zhi Wei Feng
Keyword(s):  
Dynamic Behavior ◽  
Space Debris ◽  
Critical Issue ◽  
Evaluation Index ◽  
Dynamics Modeling ◽  
Finite Segment ◽  
Modeling And Analysis ◽  
Modeling Technology ◽  
Debris Removal ◽  
Simulation Results

Space nets is one of most promising conceptions that designed for the space debris removal. A critical issue in the design and analysis of space net system is the deployment modeling technology. The dynamic behavior of space net system in different ejection modes is investigated based on finite segment approach. The simulation results show that the model and the evaluation index developed in this paper provide a valid method to evaluate the deployment property of different ejection modes.

Modeling and analysis for dynamic behavior of elevator traction system under the braking of safety gear

2021 ◽  
Vol 263 (3) ◽  
pp. 3738-3747
Author(s):  
Xiaolong Ma ◽  
Peng Zhang ◽  
Ni Li ◽  
XI Shi ◽  
Huaiwu Zou
Keyword(s):  
Dynamic Behavior ◽  
Working Conditions ◽  
Length Change ◽  
Emergency Case ◽  
Modeling And Analysis ◽  
Braking Performance ◽  
Braking Force ◽  
Traction System ◽  
Mass Spring ◽  
Two Sides

In the emergency case when the elevator car is over speeding in the downward direction, the traction car will be stopped rapidly by the braking of safety gear. However, the counterweight and the traction sheave are still moving, which maybe induces the collision between the counterweight and the traction sheave, the slip and off-track between the traction sheave and the rope. Therefore, a two sides mass-spring-damping rope model was proposed in this paper to investigate the dynamic behavior of elevator traction system under the braking of safety gear. In this model, the interaction between the car and the counterweight on both sides of the traction sheave was introduced. Meanwhile, the slip behavior and various constraints between the rope and traction sheave were respected in this model. Especially, the rope slack and the rope length change were considered to approach the mechanical properties of real rope. Furthermore, a numerical scheme based on Newmark- method was applied to solve the proposed dynamic model. Then the impacts of the braking force on the dynamic behavior of elevator traction system under different working conditions were deeply studied. Results showed the braking force of the safety gear, the speed and the acceleration of the traction sheave had great influences on the bounce of the counterweight. In fact, the braking performance, the vibrations of the car, rope and counterweight could be well analyzed based on this model, which is key for the realization of the steady and safe braking of traction elevator.

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