scholarly journals Determination of dynamic impact factor for continuous girder bridge due to vehicle braking force by finite element method and experimental

2017 ◽  
Vol 39 (2) ◽  
pp. 149-164
Author(s):  
Nguyen Xuan Toan ◽  
Tran Van Duc
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Impact Factors ◽  
Dynamic Impact ◽  
Bending Vibration ◽  
Continuous Girder Bridge ◽  
Reaction Forces ◽  
Girder Bridge ◽  
Dynamic Impact Factor ◽  
Element Method

In this study, the finite element method (FEM) is used to investigate the dynamic response of continuous girder bridge due to moving three-axle vehicle . Vertical reaction forces of axles that change with time make bending vibration of girder significantly  increase. The braking in the first span is able to create response in other spans. In addition, the dynamic impact factors are investigated by both FEM and experiment for Hoa Xuan bridge. The results of this study provide an improved understanding of the bridge dynamic behavior and can be used as additional references for bridge codes by practicing engineers.

scholarly journals A Study on the Dynamic Interaction between Three-Axle Vehicle and Continuous Girder Bridge with Consideration of Braking Effects

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Xuan-Toan Nguyen ◽  
Van-Duc Tran ◽  
Nhat-Duc Hoang
Keyword(s):  
Rapid Development ◽  
Dynamic Interaction ◽  
Impact Factors ◽  
The Finite Element Method ◽  
Bending Vibration ◽  
Traffic Loading ◽  
Girder Bridges ◽  
Continuous Girder Bridge ◽  
Reaction Forces ◽  
Girder Bridge

Continuous girder bridges become increasingly popular because of the rapid development of highway throughout the world. Most of previous researches on vibration analysis of a multispan continuous bridge subject to complex traffic loading and vehicle dynamic interaction focus on the girder displacement not considering braking effects. In current literature, few studies have discussed the effects of braking on continuous girder bridges. In this study, we employ the finite element method (FEM) to investigate the dynamic response of continuous girder bridge due to three-axle vehicle. Vertical reaction forces of axles that change with time make bending vibration of girder increase significantly. The braking in the first span is able to create response in other spans. In addition, the dynamic impact factors are investigated by both FEM and experiments on a real bridge structure. The results of this study extend the current understanding of the bridge dynamic behaviors and can be used as additional references for bridge codes by practicing engineers.

scholarly journals Design and fabrication of a microelectromechanical system resonator based on two orthogonal silicon beams with integrated mirror for monitoring in-plane magnetic field

2019 ◽  
Vol 11 (7) ◽  
pp. 168781401985368 ◽  
Author(s):  
Jesús Acevedo-Mijangos ◽  
Antonio Ramírez-Treviño ◽  
Daniel A May-Arrioja ◽  
Patrick LiKamWa ◽  
Héctor Vázquez-Leal ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Resonant Frequency ◽  
Microelectromechanical Systems ◽  
Analytical Models ◽  
Complex Signal ◽  
Bending Vibration ◽  
Element Method ◽  
Silicon Beams

We present a resonant magnetic field sensor based on microelectromechanical systems technology with optical detection. The sensor has single resonator composed of two orthogonal silicon beams (600 µm × 26 µm × 2 µm) with an integrated mirror (50 µm × 34 µm × 0.11 µm) and gold tracks (16 µm × 0.11 µm). The resonator is fabricated using silicon-on-insulator wafer in a simple bulk micromachining process. The sensor has easy performance that allows its oscillation in the first bending vibration mode through the Lorentz force for monitoring in-plane magnetic field. Analytical models are developed to predict first bending resonant frequency, quality factor, and displacements of the resonator. In addition, finite element method models are obtained to estimate the resonator performance. The results of the proposed analytical models agree well with those of the finite element method models. For alternating electrical current of 30 mA, the sensor has a theoretical linear response, a first bending resonant frequency of 43.8 kHz, a sensitivity of 46.1 µm T−1, and a power consumption close to 54 mW. The experimental resonant frequency of the sensor is 53 kHz. The proposed sensor could be used for monitoring in-plane magnetic field without a complex signal conditioning system.

scholarly journals Determining and Analysing Support Conditions at Variable Construction of Crankshafts

2018 ◽  
Vol 1 (1) ◽  
pp. 553-560 ◽  
Author(s):  
Krzysztof Nozdrzykowski ◽  
Zenon Grządziel ◽  
Jozef Harušinec
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Research Subject ◽  
Elastic Deformations ◽  
Study Results ◽  
Reaction Forces ◽  
Support Conditions ◽  
Angle Of Rotation ◽  
Element Method

Abstract The article presents study results of the influence of crankshaft construction changes on the choice of support conditions allowing to eliminate deflections and elastic deformations of crankshafts under their self-weight. For the purpose of this study we implemented a programme for strength calculations Nastran FX 2010 which enables modelling the research subject with a finite element method and counting the value if reaction forces ensuring zero value of deflections on main journals at a change in the crankshaft’s angle of rotation.

The Numerical Simulation of Workpiece Clamping

2014 ◽  
Vol 474 ◽  
pp. 218-223 ◽  
Author(s):  
Jarmila Oravcová
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Experiments ◽  
Simulation Models ◽  
Contact Points ◽  
Reaction Forces ◽  
The Creation ◽  
Made In ◽  
Element Method

The paper deals with the effects of clamping forces on the workpiece during clamping fixture. It describes an experiment using numerical simulation. With numerical experiments we wanted to find out displacement of basic points of the model and changes in the reaction forces in contact points. In the experiment it was considered with initial inaccuracies of contact points. Verification of their effect was made on simulation models of workpieces, which were made in software ANSYS. The creation of the model was used finite element method.

Sign in / Sign up

Export Citation Format

Share Document