Modal and Wind Vibration Analysis about Steel Chimney Outer Wall with a Spiral Guide Plate Based on Workbench

2014 ◽  
Vol 508 ◽  
pp. 215-218
Author(s):  
Xu Lei Deng ◽  
Jia Ning He ◽  
Chao Zhang ◽  
Jin Song Li ◽  
Yan Li
Keyword(s):  
Resonant Frequency ◽  
Frequency Band ◽  
Vibration Frequency ◽  
Vibration Analysis ◽  
Outer Wall ◽  
Wind Load ◽  
Paper Analysis ◽  
Guide Plate ◽  
Wind Vibration ◽  
Load Impact

This paper analysis a steel chimney outer wall with a spiral guide plate. Through calculation the steel chimney structure modal, self-vibration and wind vibration frequency verify this steel chimney can reduce the wind load impact on the chimney and flange connection. Achieve a method of improved the strength of chimney structure. The chimney under wind load resonant frequency band is reduced effectively and obtained a more stable exterior structure, offered basis for steel chimney transform in wind vibration problem.

scholarly journals Compound Fault Diagnosis of Bearings Using an Improved Spectral Kurtosis by MCDK

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Shuting Wan ◽  
Xiong Zhang ◽  
Longjiang Dou
Keyword(s):  
Resonant Frequency ◽  
Frequency Band ◽  
Practical Applications ◽  
Noise Interference ◽  
Spectral Kurtosis ◽  
Modified Method ◽  
Weak Fault ◽  
Fault Information ◽  
Demodulation Method ◽  
Fault Characteristic

The fast spectrum kurtosis (FSK) algorithm can adaptively identify and select the resonant frequency band and extract the fault feature by the envelope demodulation method. However, in practical applications, the fault source may be located in different resonant frequency bands; plus in noise interference, the weak side of the compound fault is not easy to be identified by the FSK. In order to improve the accuracy of fast spectral kurtosis analysis method, a modified method based on maximum correlation kurtosis deconvolution (MCKD) is proposed. According to the possible fault characteristic frequencies, the period of MCKD is calculated, and the appropriate filter length is selected to filter the original compound fault signal. In this way, the compound fault located in different resonance bands is separated. Then, the signal after MCKD filtering is analyzed by FSK. Through the simulation and experimental analysis, the MCKD can separate the compound fault information in different frequency band and eliminate the noise interference; the FSK can accurately identify the resonance frequency and identify the weak fault characteristics of compound fault.

Ultrasonic Horn Design and Weldability in Thin Ni Plates Welding

2014 ◽  
Vol 941-944 ◽  
pp. 2053-2057 ◽  
Author(s):  
Woo Yeol Park ◽  
Chang Hee Lee ◽  
Dong Sam Park
Keyword(s):  
Resonant Frequency ◽  
Vibration Analysis ◽  
Vibration Amplitude ◽  
Welding Parameters ◽  
Response Analysis ◽  
Harmonic Response ◽  
Pressure Time ◽  
Welding Strength ◽  
Harmonic Response Analysis ◽  
Fft Analysis

In this research, a new ultrasonic horn is designed and fabricated for welding thin Ni plates by vibration analysis. Two types of the horn tip are fabricated to evaluate the effect of horn’s tip on the weldability. Modal analysis, harmonic response analysis and FFT analysis are carried out for verifying the adequacy of the developed horn. To evaluate weldability of two types of horn tip, welding strength and the microstructure of the weld surface are experimentally investigated with various welding parameters such as pressure, time and vibration amplitude. Finally, the new horn with resonant frequency of 40 kHz is developed, and it is shown that welding strength and the microstructure of the weld surface are largely affected by horn’s tip shape.

Vibration Analysis of Vehicle-Rail System under the Condition of Track Stiffness Irregularity

2013 ◽  
Vol 368-370 ◽  
pp. 1431-1437 ◽  
Author(s):  
Tian Yu Lu ◽  
Zu Jun Yu ◽  
Hong Mei Shi
Keyword(s):  
Frequency Spectrum ◽  
Vibration Frequency ◽  
Vibration Analysis ◽  
High Speed ◽  
Track Structure ◽  
High Speed Train ◽  
Track Maintenance ◽  
Rail System ◽  
Coupling System ◽  
Track Stiffness

The interaction of track structure and high-speed train has greater impact on safe and steady running of the trains. This paper obtained acceleration and frequency spectrum of the train's running vibration in the case of sleeper’s spacing and continuous failure， and continuous and spacing loose tie by establishing the vertical model of vehicle-track coupling system, and analyzed the sleeper failure and loose tie which has a greater impact on the 40-80 Hz vibration frequency of the train, which provided a basis for track maintenance.

scholarly journals Design and Analysis of a THz Metamaterial Structure with High Refractive Index at Two Frequencies

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Zan Lu ◽  
Bruno Camps-Raga ◽  
N. E. Islam
Keyword(s):  
Refractive Index ◽  
Resonant Frequency ◽  
Frequency Band ◽  
High Refractive Index ◽  
Structure Design ◽  
Parameter Analysis ◽  
Single Frequency ◽  
Dual Frequency ◽  
Unit Cells ◽  
Constitutive Parameters

The concept of a single frequency band, single high-refractive-index metamaterial has been extended and applied in the design of dual frequency band, dual high-refractive-index metamaterials in the THz regime. The structure design consists of twenty five unit cells with a surface area of 250 um by 250 um and a thickness of 5 um. Each cell has metallic structures embedded in a polyimide substrate. The return loss (S-parameter) analysis shows two strong electric responses at two frequency ranges, and the extracted constitutive parameters suggested high values of simultaneous dielectric constant and permeability at these frequencies. Results retrieved from the S-parameters also show high refractive index values. A first peak refractive index of 61.83 was observed at a resonant frequency of 0.384 THz, and another peak refractive index of 19.2 was observed at the resonant frequency 1.416 THz. Analysis show that higher refractive index at the second resonance frequency band is achievable through redesign of the structures, and modifications could lead to a single structure with multiple frequency, multiple high-refractive-index metamaterials that can be put to practical use.

scholarly journals A Design Methodology for EV-WPT Systems to Resonate at Arbitrary Given Bands

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 213
Author(s):  
Yong Yin ◽  
Yuhua Xiao ◽  
Chengliang Wang ◽  
Qingsheng Yang ◽  
Yahui Jia ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Frequency Band ◽  
Resonant State ◽  
Design Method ◽  
Single Band ◽  
Frequency Deviation ◽  
Center Frequency ◽  
Current Response ◽  
Efficient Energy Transfer ◽  
The Given

Due to the effects of splitting frequency and cross coupling, the resonant frequency of the WPT system usually deviates from the given frequency band, and the system operating at the given frequency band suffers a very low output power. Ensuring that electric vehicle wireless power transfer (EV-WPT) systems operate at a resonant state is the prerequisite for efficient energy transfer. For this purpose, a novel design method by manipulating the eigenstate parameters is proposed in this paper. The proposed system can make a EV-WPT system with arbitrary coil successfully to resonate at any given bands, not just a single band. Therefore, the method designed in this article cannot only eliminate the problem of low power caused by frequency deviation, but also realize the application requirements of multiple frequency bands. Firstly, this article establishes an accurate state space model of an n-coil fully coupled EV-WPT system, and after that, the analytical current response on each circuit is derived. Based on that, a detailed frequency spectrum analysis is presented, along with several essential spectrum parameters’ derivations, including center frequencies and bandwidths. Then, with the center frequency and bandwidth as the design indexes, a novel methodology of designing to make EV-WPT systems achieve resonant-state at arbitrary given bands is derived. Finally, simulation and experimental verification are carried out. Simulation and experimental results show that whether it is a single-band or multi-band system, the accuracy of the value under designed resonant frequency is less than 0.01, which can effectively eliminate the frequency deviation phenomenon and obtain the maximum power output at the given frequency band.

scholarly journals Analysis of wind load impact on the high-rise buildings glass facade

2019 ◽  
Vol 698 ◽  
pp. 022046
Author(s):  
L A Zolotareva ◽  
A R Lebedinskaya ◽  
S E Komarova
Keyword(s):  
Wind Load ◽  
High Rise ◽  
Glass Facade ◽  
Load Impact ◽  
Glass Façade

Study on Wind Load Performance for L Type Aerial Work Suspended Platform

2012 ◽  
Vol 479-481 ◽  
pp. 2013-2016
Author(s):  
Hui Ye Yu ◽  
Liang Zhao ◽  
Ke Zhang ◽  
Yu Hou Wu
Keyword(s):  
Optimization Design ◽  
Natural Vibration ◽  
Wind Load ◽  
Calculation Model ◽  
Vibration Period ◽  
Design And Optimization ◽  
Load Calculation ◽  
Wind Vibration ◽  
Inherent Frequency ◽  
Wind Vibration Coefficient

Based on the wind load calculation model increases Suspended Platform vibration characteristics of wind vibration coefficient, and gets Suspended Platform natural vibration period and inherent frequency by ANSYS finite element modal analysis, then determines the wind vibration coefficient, calculates the wind load of Suspended Platform in working state and non-working state. Aiming at three different conditions, analyzes the platform structure in the wind load the stress intensity and deformation. Through analysis to finds the most dangerous positions of Suspended Platform in three different conditions, provides effective references for the L Type Suspended Platform in wind-resistant design and optimization design.

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