scholarly journals Dynamic Response at Various Points of Aluminum Cantilever Beam

2020 ◽  
Vol 9 (12) ◽  
pp. 25260-25264
Author(s):  
Nanang Endriatno ◽  
Budiman Sudia ◽  
Raden Rinova Sisworo ◽  
Muhammad Faisal
Keyword(s):  
Dynamic Response ◽  
Cantilever Beam ◽  
Displacement Velocity ◽  
Maximum Displacement ◽  
Measuring Point ◽  
Minimum Value ◽  
Aluminum Beam

The aim of the study was to analyze the dynamic response along an aluminum cantilever beam. The data measured were displacement (mm), velocity (mm / s), and acceleration (m/s2) with 3 variations of the measurement position on the beam. The 6061 series aluminum beam used have length: 80 cm, height: 32 cm, and width: 32 cm. Data were collected experimentally using a vibration meter to measure beam vibrations at the various positions from the cantilever beam at a distance from support: 10 cm, 35 cm, and 60 cm. The results of the analysis showed that the values ​​of the displacement, velocity and acceleration of the object vibrations change when the measuring point was far from the cantilever support. The maximum displacement value is at 60 cm from the support: 0.02 mm, and the lowest is at 10 cm: 0.12 mm. The velocity value also increases, maximum at 60 cm from the support: 38.58 mm/s and the minimum value at 10 cm: 12.30 mm/s. While the acceleration value, the maximum at 60 cm from the support: 91150 mm/s2 and the minimum at 10 cm: 66900 mm/s2.  

Dynamic Response of Spiral Cantilever Undergoing Magnetic Coupling

2014 ◽  
Vol 14 (08) ◽  
pp. 1440021
Author(s):  
Xiaoling Bai ◽  
Yumei Wen ◽  
Ping Li ◽  
Jin Yang ◽  
Xiao Peng ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Cantilever Beam ◽  
Magnetic Force ◽  
Coupling Effect ◽  
Magnetic Coupling ◽  
Resonant Frequencies ◽  
Energy Harvesters ◽  
Magnetic Transducer ◽  
Underlying Mechanisms ◽  
Tip Mass

Cantilever beams have found intensive and extensive uses as underlying mechanisms for energy transduction in sensors as well as in energy harvesters. In magnetoelectric (ME) transduction, the underlying cantilever beam usually will undergo magnetic coupling effect. As the beam itself is either banded with magnetic transducer or magnets, the dynamic motion of the cantilever can be modified due to the magnetic force between the magnets and ME sensors. In this study, the dynamic response of a typical spiral cantilever beam with magnetic coupling is investigated. The spiral cantilever acts as the resonator of an energy harvester with a tip mass in the form of magnets, and a ME transducer is positioned in the air gap and interacts with the magnets. It is expected that this spiral configuration is capable of performing multiple vibration modes over a small frequency range and the response frequencies can be magnetically tunable. The experimental results show that the magnetic coupling between the magnets and the transducer plays a favorable role in achieving tunable resonant frequencies and reducing the frequency spacings. This will benefits the expansion of the response band of a device and is especially useful in energy harvesting.

scholarly journals Research on Dynamic Response Characteristics for Basement Structure of Heavy Haul Railway Tunnel with Defects

Mathematics ◽  
2021 ◽  
Vol 9 (22) ◽  
pp. 2893
Author(s):  
Jinfei Chai
Keyword(s):  
Constitutive Model ◽  
Dynamic Response ◽  
Principal Stress ◽  
Surrounding Rock ◽  
Railway Tunnel ◽  
Basement Structure ◽  
Measuring Point ◽  
Heavy Haul ◽  
Damage Constitutive Model ◽  
Heavy Haul Railway

Based on the basic principle of thermodynamics, an elastoplastic damage constitutive model of concrete is constructed in this paper. The model is realized and verified in FLAC3D, which provides a solid foundation for the study of dynamic response and fatigue damage to the base structure of a heavy haul railway tunnel. The dynamic response and damage distribution of the base structure of a heavy-duty railway tunnel with defects were numerically simulated by the concrete elastic-plastic damage constitutive model. Then, by analyzing the response characteristics of the tunnel basement structure under different surrounding rock softening degrees, different foundation suspension range and different foundation structure damage degree are determined. The results show the following: (1) The elastoplastic damage constitutive model of concrete can well describe the stress–strain relationship of materials, especially with the simulation results of post peak softening being in good agreement with the test results, and the simulation effect of the unloading–reloading process of the cyclic loading and unloading test also meet the requirements. (2) The initial stress field and dynamic response of the tunnel basement structure under the action of train vibration load are very different from the ideal state of the structure design when the surrounding rock of the base is softened, the base is suspended, or the basement structure is damaged. With the surrounding rock softening, basement hanging, or basement structure damage developing to a certain extent, the basement structure will be damaged. (3) The horizontal dynamic stress amplitude increases with the increase in the softening degree of the basement surrounding rock. The horizontal dynamic stress of the measuring point increases with the increase in the width of the hanging out area when the hanging out area is located directly below the loading line. When the degree of damage to the basement structure is aggravated, the horizontal dynamic tensile stress of each measuring point gradually decreases. (4) The maximum principal stress increment increases with the increase in the fracture degree of the basement structure, while the minimum principal stress increment decreases with the increase in the fracture degree of the basement structure, but the variation range of the large and minimum principal stress increments is small. The research results have important theoretical and practical significance for further analysis of the damage mechanism and control technology of the foundation structure of a heavy haul railway tunnel with defects.

Design, Manufacturing and Testing of Small Shaking Table

2018 ◽  
Vol 7 (4.20) ◽  
pp. 426 ◽  
Author(s):  
Asad H. Humaish ◽  
Mohammed S. Shamkhi ◽  
Thualfiqar K. Al-Hachami
Keyword(s):  
Dynamic Response ◽  
Shaking Table ◽  
Single Frequency ◽  
Main Body ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
Geotechnical Centrifuge ◽  
Concrete Gravity Dams ◽  
Sinusoidal Waveform ◽  
Model Weight

The seismic performance and the dynamic response of concrete gravity dams can be verified by several techniques. Both geotechnical centrifuge apparatus (under N-g values) and shaking table (under 1-g) are the commonly used techniques in the world. This paper deals with designing, manufacturing, and testing of small shaking table to investigate different geotechnical and engineering problems. The main body of the designed shaking table consists of steel frame (local iron) manufactured as a hollow box with steel plate, 6mm in thickness and one-direction movable platform (as a basket carrying the container of the model).  Inside this main box, all the mechanical parts that work as one system to generate the motion of the seismic wave with an acceleration that needed to the test.  The facilities of this shaking table, the movable base has a dimension of 0.8m x1.2m and the platform mass approximately 2 kN, the maximum allowable model weight of 10kN, the range of frequency from 0 to 20 Hz, the maximum acceleration amplitude of 1.2g and maximum displacement of 14mm. It can simulate only the single frequency motion (i.e. sinusoidal wave). The measured accelerations at different soil model level for the tested shaker under 0.6g sinusoidal waveform gave a reasonable prediction for the dynamic response and the amplification characteristics.  

scholarly journals Application Study on Active Advanced Support Technology in Deep Roadway under Mine Goaf

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Pengfei Jiang ◽  
Peng Xiao ◽  
Fanbao Meng ◽  
Suolin Jing ◽  
Jingkai Zhang ◽  
...  
Keyword(s):  
Base Point ◽  
Surrounding Rock ◽  
Maximum Displacement ◽  
Measuring Point ◽  
Deformation And Failure ◽  
Anchor Cable ◽  
Working Face ◽  
Allowable Range ◽  
Advanced Support ◽  
Working Procedure

To solve the problems of the rapid advance of the working face was delayed by complicated working procedure and high labor intensity, and the severe damage of roof bolt (anchor cable) induced by advanced hydraulic support, the deformation characteristics of surrounding rock, and the supporting principle of grouting truss anchor cable were analyzed theoretically by taking the roadway of 3_(down) coal seams 2326# working face in Sanhekou coal mine as the research object; then, the mechanical model of supporting structure of roadway under goaf was established. Based on this model, the optimal supporting scheme was determined, and the active advanced support technology scheme of “advanced grouting truss anchor cable” was proposed to take the place of the existing single pillar. The deformation and failure characteristics of surrounding rock of the working face leading roadway were observed and analyzed on-site. Within the allowable range of reading error, the results showed that the maximum displacement of medium-deep base point and shallow base point of two roadways was 15.2 cm and 10.9 cm, respectively; the pressure value had a more obvious jump increase when the distance between each measuring point and the working face was about 35 m, which means the range is strongly affected by the advance mining, and the area affected by advanced mining was 35 m ahead of the working face. It was observed that the lowest position of roof separation development ranged from 0.71 m to 2.73 m. The separation layer was generally distributed in the range of 0.73 m-2.49 m, and the fracture area was roughly distributed in the range of 0.01 m-0.62 m. Under the condition of overlying goaf, there was a complete stress structure, which can meet the requirements of suspension support.

Dynamic Response of a Steel Bridge under Earthquake Action in Liugong Island of Weihai

2015 ◽  
Vol 777 ◽  
pp. 23-26
Author(s):  
Xing Zi Jiao ◽  
Yong Bo Shao
Keyword(s):  
Dynamic Response ◽  
Seismic Wave ◽  
Maximum Stress ◽  
Seismic Action ◽  
Steel Bridge ◽  
Maximum Displacement ◽  
Special Steel ◽  
Dynamic Analyses ◽  
Earthquake Action ◽  
Bracing System

This study presents finite element analyses for a special steel bridge under the action an actual seismic wave. The maximum stress and the maximum deflection of the bridge are calculated based on the dynamic analyses. It is found that the bracing system and the beams between the two columns at the end of the bracing system are the critical members in the steel bridge under seismic action. The maximum displacement of the steel bridge is located at the overhang beams at the bridge end. However, the dynamic response is different when the seismic wave is input in different directions. Based on the numerical results, it is found that the special steel bridge is safe under the seismic action.

Analysis of Dynamic Response of High Rockfill Embankment under Seismic Loads

2010 ◽  
Vol 163-167 ◽  
pp. 4363-4366 ◽  
Author(s):  
Cheng Zhong Yang
Keyword(s):  
Dynamic Response ◽  
Seismic Design ◽  
Response Spectrum ◽  
Element Model ◽  
Security Evaluation ◽  
Seismic Loads ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
Embankment Slope ◽  
The Right

To reveal the stress-strain properties of Gangou high rockfill embankment with 71m high under seismic loads and provide the reference for its security evaluation and the seismic reinforcement design. By simplifying the high rockfill embankment as the plane problem, establishing two-dimensional finite element model, inputting EL Centro and applying seismic response spectrum method, the dynamic response of high rockfill embankment under seismic loads were simulated. The results show that: With the increase of embankment height, the dynamic response presents increasing tendency; The maximum displacement occurs on the right side of the embankment top, t1474he maximum acceleration appears at the middle of embankment slope. From the view of seismic design, the right side of the embankment top and the middle of embankment slope are the focus of seismic design.

Dynamic Response Analysis for the Solar-Powered Aircraft Composite Wing Panel with Viscoelastic Damping Layer

2011 ◽  
Vol 105-107 ◽  
pp. 491-494
Author(s):  
Tie Jun Liu ◽  
Yong Zhang ◽  
Gang Li ◽  
Feng Hui Wang
Keyword(s):  
Dynamic Response ◽  
Vibration Isolation ◽  
Viscoelastic Damping ◽  
Response Analysis ◽  
Aircraft Wing ◽  
Maximum Displacement ◽  
Displacement Response ◽  
Stiffened Structures ◽  
Solar Powered ◽  
Wing Panel

In design of solar powered aircraft wing panel, vibration properties of wing panel should be considered, especially for the peak value of dynamic response. In this research, a viscoelastic damping layer is built for vibration isolation, wing panel finite element models of stiffened and no-stiffened structures base on fiber-reinforced laminates with damping layer in the middle are built. Natural frequency and displacement response are analyzed with different thickness of damping layer and structures. Result shows natural frequencies decrease as thickness increased, and that of laminates are lower than stiffened structure. The maximum displacement response value decreased when thickness increased and that of laminates is higher than structured with stiffer. The presented work is helpful for type selection and designing of solar powered aircraft wing panel.

Research of Piezoelectric Cantilever Beam Diaphragm Pump

2013 ◽  
Vol 397-400 ◽  
pp. 483-488
Author(s):  
Hao Cai ◽  
Liang Liang Wang ◽  
Jing Shi Dong ◽  
Yang Yang ◽  
Feng Lin
Keyword(s):  
Cantilever Beam ◽  
Experimental Tests ◽  
Input Voltage ◽  
Maximum Displacement ◽  
Diaphragm Pump ◽  
Output Terminal ◽  
Fea Model ◽  
Piezoelectric Cantilever ◽  
Resonance Frequencies ◽  
Output Flow

The design in this paper is a rectangular piezoelectric vibrator driven Cantilever Beam Diaphragm Pump. By analyzing the working principle and characteristics of the piezoelectric cantilever beam pump, we developed the dynamics model and FEA model of the piezoelectric cantilever beam and optimized through tests the main factors that affect the output flow of the piezoelectric cantilever pump. Additionally, we designed the piezoelectric cantilever pump prototype, and by using an impedance analyzer, we measured the resonance frequencies of cantilever beams of different lengths; and we used the laser micrometer to test and measure the beams of different structures under loaded and unloaded condition. The maximum displacement of the output terminal of loaded cantilever beam is 50.5μm. Furthermore, through the experiments we tested the output flow and its corresponding variation under different diameters of transmission pistons and different excitation frequencies. Experimental tests show: when selecting the cantilever beam and the drive piston with optimal performance with the input voltage at 120V, and the frequency at 197Hz, the optimum output flow rate is 89ml/min.

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