Analysis of Motor Vibration Frequency by the Change of the Base Anchor Inclined Plate Length

2015 ◽  
Vol 719-720 ◽  
pp. 231-237
Author(s):  
Yu Gu ◽  
Qiang Li ◽  
Shao Xiong Li
Keyword(s):  
Natural Frequency ◽  
Length Change ◽  
Inclined Plate ◽  
Plate Length ◽  
Foot Length ◽  
Comparison Results ◽  
Inherent Frequency ◽  
Motor Model ◽  
Motor Vibration ◽  
Important Significance

It will vibrate when the natural frequency close to the external exciting force during the operation of the motor, accurate and effective calculation of the natural frequency of the motor has an important significance to damping noise. The inherent frequencies of the motor were got by numerical simulation model and the ANSYS finite element modal analysis, and comparison results verify the effectiveness of the motor model. The effect of the foot length change to the inherent frequency was researched emphasis, and puts forward related suggestions.

The Numerical Simulation and Finite-Element Analysis of the Motor Vibration Problem Based on the Base Anchor Softening Layer

2013 ◽  
Vol 815 ◽  
pp. 860-867
Author(s):  
Yu Gu ◽  
Shao Xiong Li ◽  
Rui Li ◽  
Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Exciting Force ◽  
Element Analysis ◽  
Comparison Results ◽  
Inherent Frequency ◽  
Motor Model ◽  
Motor Vibration ◽  
Important Significance

Vibration results from situation when the inherent frequency close to the external exciting force during the operation of the motor, so accurate and effective calculation of the natural frequency of the motor has an important significance to damping noise. By numerical simulation model and the ANSYS finite element modal, the inherent frequencies were got of the motor and comparison results verify the effectiveness of the motor model. The effect of the modulus of elasticity of the softening layer between the motor and the ground to the inherent frequency was researched intensively, and puts forward related suggestions.

The Research on the Design of the Vertical Axis Wind Turbine Street Light Pole

2013 ◽  
Vol 341-342 ◽  
pp. 383-386
Author(s):  
Zhong Guo Bian ◽  
Shu Qin Liu ◽  
Guo Zhi Han
Keyword(s):  
Wind Turbine ◽  
Natural Frequency ◽  
Wall Thickness ◽  
Vertical Axis ◽  
Mechanical Analysis ◽  
Vertical Axis Wind Turbine ◽  
Wind Generator ◽  
Inherent Frequency ◽  
Light Pole

According to the characteristics of the vertical axis wind turbine, research about the mechanical analysis and inherent frequency in design of the small vertical axis wind generator pole is complete, and simulation on the influence of the structure forms and pole wall thickness on natural frequency has been done. The results can help solve the problem such as resonance between the wind turbine pole and the rotating turbine.

Computation Model and Influencing Factors Analysis for Dynamic Characteristic of Underwater Monitoring Platforms

2014 ◽  
Vol 577 ◽  
pp. 651-654
Author(s):  
Kong De He ◽  
Zi Fan Fang ◽  
Yi Zhang ◽  
Wei Hua Yang
Keyword(s):  
Dynamic Characteristic ◽  
Natural Frequency ◽  
Influencing Factors ◽  
Analysis Method ◽  
Factors Analysis ◽  
Structure Vibration ◽  
Vibration Modal ◽  
Computing Method ◽  
Monitoring Platform ◽  
Important Significance

The computational model for underwater monitoring platform with drag force, normal lift along flow and buoyancy was formulated aimed at dynamic characteristic by the finite computing method of structure vibration modal on flow field and infinitesimal method idea, and taking into account the influence of flow force to structures dynamic characteristic. Discuss the influencing factors for natural frequency of underwater monitoring platform by numerical analysis method. Natural frequency of buoy was far from the vortex release frequency by adjusting the influencing factors. This method can effectively decrease the vibration by resonance and it has important significance to design the underwater monitoring platform.

Experimental Modal Analysis of Compressor Vibration Isolating System Based on LMS Test.Lab

2011 ◽  
Vol 121-126 ◽  
pp. 3283-3288
Author(s):  
Li Zhang ◽  
Hao Chen ◽  
Yan Jue Gong ◽  
Jing Wang
Keyword(s):  
Resonance Frequency ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Single Layer ◽  
Experimental Modal Analysis ◽  
Impact Testing ◽  
Modal Parameters ◽  
Isolation System ◽  
Refrigeration Unit ◽  
Comparison Results

In order to reduce vibration and noise of the compressor used in small and medium-sized refrigeration unit, this paper designs different vibration isolating systems and carries out experimental modal analysis based on LMS Test. Lab Impact Testing software. The comparison results of modal parameters of four different vibration isolating systems show that the natural frequency of single-layer vibration isolating system is higher than that of non-isolation system and effectively avoids the second order resonance frequency. Furthermore the natural frequency of double-layer vibration isolating system has reduced due to the additional middle-mass. And the system's natural frequency decreases obviously with the increase of middle-mass which is far from resonance frequency and significantly improve the effect of vibration isolating system.

Effect of the Simplified Superstructure and Soil-Structure Interaction Models on the Natural Frequencies of an Offshore Wind Turbine

2021 ◽  
Author(s):  
Philip Alkhoury ◽  
Abdul-Hamid Soubra ◽  
Valentine Rey ◽  
Mourad Aït-Ahmed
Keyword(s):  
Natural Frequency ◽  
Three Dimensional ◽  
Interaction Model ◽  
Offshore Wind ◽  
Accurate Estimation ◽  
Offshore Wind Turbine ◽  
Soil Reaction ◽  
Fundamental Frequencies ◽  
Comparison Results ◽  
Simplifying Assumptions

Abstract Monopile-supported offshore wind turbines (OWTs) are dynamically sensitive structures, in which their design is principally based on a dimensioning criterion related to its fundamental frequencies. Therefore, an accurate estimation of the natural frequency is essential to assess the working lifetime of the OWT. For the calculation of the OWT natural frequency, several studies exist but few of them simultaneously consider both the real geometrical configuration of the OWT superstructure (blades, nacelle, tower, and transition piece) and the three-dimensional (3D) soil domain and its interaction with the foundation. The aim of this paper is to investigate the suitability of (i) the different simplifying assumptions used in literature for the superstructure and (ii) the recently proposed PISA soil-foundation interaction model, when calculating the natural frequency. This is performed by comparing the results obtained using a rigorous three-dimensional (3D) finite element-based model recently developed by the authors of this paper with those obtained based on these simplifications. The comparison results have shown that both the simplified superstructure models and the newly developed soil reaction curves of the PISA project provide very good results of the OWT natural frequency.

Sensitivity Analysis of 1000MW USC Units Shafting Torsional Vibration Based on ANSYS

2012 ◽  
Vol 226-228 ◽  
pp. 162-165
Author(s):  
Shi Liu ◽  
Cong Wang ◽  
Bing Li ◽  
Chang Chen ◽  
Dan Mei Xie
Keyword(s):  
Sensitivity Analysis ◽  
Natural Frequency ◽  
Torsional Vibration ◽  
Structural Parameters ◽  
Vibration Characteristics ◽  
Moment Of Inertia ◽  
Safe Operation ◽  
Important Significance

To calculate a shaftings natural frequency of torsional vibration is one of the most important tasks in turbo-generators design, manufacture and frequency adjusting process. The sensitivity analysis of shafting structural parameters impact on the torsional vibration characteristics has important significance in reducing the amplitude of torsional vibration and ensuring the turbo-generators safe operation. In this paper, a 1000MW USC unit was taken as a research object to analyze the shaftings sensitivity to moment of inertia.

Perceptions of Stuttering of Different Age Groups

2019 ◽  
Vol 4 (6) ◽  
pp. 1311-1315
Author(s):  
Sergey M. Kondrashov ◽  
John A. Tetnowski
Keyword(s):  
Age Groups ◽  
School Age Children ◽  
Clinical Implications ◽  
School Age ◽  
Fourth Edition ◽  
Self Perception ◽  
Behavioral Measures ◽  
Self Rating ◽  
Comparison Results ◽  
Subject Pool

Purpose The purpose of this study was to assess the perceptions of stuttering of school-age children who stutter and those of adults who stutter through the use of the same tools that could be commonly used by clinicians. Method Twenty-three participants across various ages and stuttering severity were administered both the Stuttering Severity Instrument–Fourth Edition (SSI-4; Riley, 2009 ) and the Wright & Ayre Stuttering Self-Rating Profile ( Wright & Ayre, 2000 ). Comparisons were made between severity of behavioral measures of stuttering made by the SSI-4 and by age (child/adult). Results Significant differences were obtained for the age comparison but not for the severity comparison. Results are explained in terms of the correlation between severity equivalents of the SSI-4 and the Wright & Ayre Stuttering Self-Rating Profile scores, with clinical implications justifying multi-aspect assessment. Conclusions Clinical implications indicate that self-perception and impact of stuttering must not be assumed and should be evaluated for individual participants. Research implications include further study with a larger subject pool and various levels of stuttering severity.

Energy Efficiency Analysis in ERA using NFL-BA Algorithm

2020 ◽  
pp. 340-348
Author(s):  
Palky Mehta ◽  
H. L. Sharma
Keyword(s):  
Cluster Head ◽  
Vital Role ◽  
Wireless Sensor ◽  
Energy Usage ◽  
Cluster Heads ◽  
Comparison Results ◽  
Current Scenario ◽  
Energy Efficiency Analysis ◽  
Selection Of

In the current scenario of Wireless Sensor Network (WSN), power consumption is the major issue associated with nodes in WSN. LEACH technique plays a vital role of clustering in WSN and reduces the energy usage effectively. But LEACH has its own limitation in order to search cluster head nodes which are randomly distributed over the network. In this paper, ERA-NFL- BA algorithm is being proposed for selects the cluster heads in WSN. This algorithm help in selection of cluster heads can freely transform from global search to local search. At the end, a comparison has been done with earlier researcher using protocol ERA-NFL, which clearly shown that proposed Algorithm is best suited and from comparison results that ERA-NFL-BA has given better performance.

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

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