Dynamics Study and Damping Optimization of Circular Saw Based on Numerical Simulation and Experimental Analysis

2012 ◽  
Vol 201-202 ◽  
pp. 364-369 ◽  
Author(s):  
Ming Hong Yuan ◽  
Shui Guang Tong ◽  
Qin Cai ◽  
Ning Tang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Calculation ◽  
Experimental Analysis ◽  
Vibration Mode ◽  
Damping Ratio ◽  
Modal Testing ◽  
Vibration Displacement ◽  
Circular Saw ◽  
Cutting Vibration

Serious vibration and noise exists in the circular saw cutting process. In order to reduce the cutting vibration and noise, this paper uses the finite element numerical calculation and modal testing analysis to study the dynamic characteristics of the circular saw blades, obtain the circular saw’s kinetic parameters, such as each order natural frequency, the main vibration mode and damping ratio, evaluate the circular saw system’s dynamic response. Through the optimization of slotted design and experimental analysis, a circular saw with reasonable structure reduces the maximum vibration displacement of 11.1% which increases the circular saw blades cutting quality, prolongs the service life and reduces the cutting noise.

scholarly journals The Experimental Analysis of Vibration Monitoring in System Rotor Dynamic with Validate Results Using Simulation Data

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Hisham A. H. Al-Khazali ◽  
Mohamad R. Askari
Keyword(s):  
Finite Element ◽  
Experimental Analysis ◽  
System Analysis ◽  
Theoretical Data ◽  
Element Model ◽  
Rotating Machinery ◽  
Modal Testing ◽  
Vibration Monitoring ◽  
Mode Shapes ◽  
Computational Techniques

There is a growing tendency today to extract information about the prognostic parameters based on system analysis through various diagnostic techniques to assess the health of the plant or equipment. Vibration monitoring helps in reducing the machine down time. A vibration signature measured at the external surface of machine or at any other suitable place contains a good amount of information to reveal the running condition of the machine. Considering the importance of vibration monitoring in the rotating machinery fault diagnostics, it has been applied in this paper. Effects of modal parameters like natural frequency, mode shapes, and damping, misalignments have been studied. Balancing is usually an expensive and laborious procedure and a balancing system would be beneficial for motor engine and power generation application. In this research, there have been identified unbalance parameters that exist in rotating machinery and develop a finite-element model of rotating dynamics system to create a mathematical model of the system from the test data and subsequently obtaining the unbalanced parameters. During this study, the raw data obtained from the experimental results (Smart Office software) are curve fitted by theoretical data regenerated from simulating it using finite element (ANSYS 12) model for comparisons. The experimental analysis used thus far is called Modal Testing, a well-known and widely used technique in research and industry to obtain the Modal and Dynamic response properties of structures. The technique has recently been applied to rotating structures and some research papers been published, however, the full implementation of Modal Testing in active structures and the implications are not fully understood and are therefore in need of much further and more in-depth investigations. The aim is to find a system identification methodology using the analytical/computational techniques and update the model using experimental techniques already established for passive structures but to active rotating structures, which subsequently help to carry out health monitoring as well as further design and development in rotating machinery.

Study on Dynamics Analysis and Application of Vibration Modal Testing of Suspension Cable Structure Based on MEMS Sensor

2013 ◽  
Vol 448-453 ◽  
pp. 2149-2152
Author(s):  
Yao En Yang ◽  
Qing Min Wang
Keyword(s):  
Finite Element ◽  
Vibration Mode ◽  
Dynamic Test ◽  
Element Model ◽  
Test System ◽  
Modal Testing ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Mems Sensor ◽  
Inherent Frequency

The large span suspension structure is easy to generate larger vibration due to its smaller stiffness. For this problem, a finite element modal analysis method that considers the effect of initial pre-stress is proposed. The finite element model of the structure is established by using Link10 unit of the finite element analysis software ANSYS. Then the first four order natural frequency and vibration mode under different initial pre-stress is solved by the subspace iterative method. And the experimental test system based on MEMS sensor is designed to analyze the layout of test points and exciting vibration mode of the structure. The test system measures the inherent frequency and the first two order vibration mode under the action of different pre-stress. The results show that the numerical analysis results are basically consistent with the experimental results and the inherent frequency of the structure distributes in the plexus intensive form. And the inherent frequency of the structure is related to the pre-stress. The bigger the stiffness of the structure, the greater the inherent frequency is. It proves that the theoretical analysis results are correct and the experiment test system can be used in the structural dynamic test.

Modal Testing and Finite Element Calculations for Lightweight Aluminum Panels in Car Carriers

2006 ◽  
Vol 43 (01) ◽  
pp. 11-21
Author(s):  
Junbo Jia ◽  
Anders Ulfvarson
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Damping Ratio ◽  
Element Model ◽  
Modal Testing ◽  
Structural Behavior ◽  
Mode Shapes ◽  
Maintenance Cost ◽  
Car Suspension ◽  
Aluminum Panels

Due to their characteristics and lower maintenance cost, lightweight aluminum structures have been widely used for manufacturing deck structures. When this type of structure is developed, the natural frequencies for the unloaded deck may increase, while the natural frequencies for loaded decks are most likely to decrease and new problems of vibration and damping may appear. In addition, it has already been shown by the authors that compared to the load effects of normal cargo, the dynamic structural behavior of a vehicle-loaded deck is different due to the participation of vehicle vibrations. The current paper presents a modal analysis by both testing and finite element (FE) calculation for a lightweight deck using aluminum panels. By comparing the results between the unloaded and car-loaded cases, it is shown how vehicle loading influences the dynamic structural behavior of the deck structures. The authors report that an aluminum panel mechanically connected to a steel frame may participate in some mode shapes of vibrations that significantly increase the corresponding damping ratio. The reasonably good agreement between modal testing results and FE calculations validates the finite element model, which may then be used for further dynamic analysis. The authors found that the spring-damping systems of car suspension and tires can interfere in the dynamic transmission of the vehicle mass into the deck structure. The study enables structural engineers interested in the design of car carriers to have a better understanding of how the vehicles parked on decks can influence the dynamic characteristics of the vehicle deck systems.

Modal Finite Element Analysis of Double Rollers Plastic Calender Equipment

2013 ◽  
Vol 744 ◽  
pp. 157-160
Author(s):  
Yan Li ◽  
Peng Zhang ◽  
He Yong Qin
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Torsional Vibration ◽  
Vibration Mode ◽  
Simulation Method ◽  
Bending Vibration ◽  
Element Analysis ◽  
Inherent Frequency ◽  
Vibration Performance

This paper mainly targeted double roll calender equipment vibration problem of study, using numerical simulation method, investigated the rollers, stents and modal of the whole machine. Conclusion as follows: (1) for the rollers are concerned, turning to the rollers inherent frequency influence is small, can be ignored. (2) stents have not only the front and back, the or so direction of the bending vibration, and torsional vibration, these vibration will influence support the intensity and rigidity. (3) the whole machine is the main complex vibration mode, stents vibration performance for concurrently bending torsional vibration, with vibration frequency increases on the rollers showing torsional vibration.

scholarly journals Finite Element Method Using a Characteristic-Based Split for Numerical Simulation of a Carbonate Fracture-Cave Reservoir

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Liehui Zhang ◽  
Yuhui Zhou ◽  
Lei Zhao ◽  
Deliang Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Fluid Flow ◽  
Numerical Calculation ◽  
Network Model ◽  
Free Flow ◽  
Complex Flow ◽  
Fracture Systems ◽  
Characteristic Based Split

Fracture-cave carbonate reservoirs occur widely in source rocks and are prospects for exploitation worldwide. However, the presence of massive caves and multiscale fracture systems results in extremely complex fluid flow patterns. Therefore, in this paper, a discrete network model for fracture-cave reservoirs was established to study fluid flow characteristics and pressure distributions in complex flow regimes. In this study, the cave system was treated as a free-flow region, and the fluid flow in fracture systems followed the Navier-Stokes and Darcy equations, respectively. After discrete modeling, the Galerkin finite element method was used for numerical calculation of the single-phase free flow; the method maintains a high-precision result with low grid orientations during the simulation. In addition, because only one linear equation requires solving at each step, the solution is obtained quickly. Moreover, based on the proposed discrete media network model of fracture-cave reservoirs and the finite element numerical calculation method, a corresponding simulator was also developed. The finite element numerical simulation method based on the characteristic-based split (CBS) algorithm has proven to be applicable to complex flow problems in fracture-cave reservoirs.

Effect of Mesh Size of Finite Element Analysis in Modal Analysis for Periodic Symmetric Struts Support

2011 ◽  
Vol 462-463 ◽  
pp. 1008-1012 ◽  
Author(s):  
Wei Bing Liu ◽  
Mamtimin Gheni ◽  
Lie Yu
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Calculation ◽  
Modal Analysis ◽  
Mesh Size ◽  
Scientific Basis ◽  
Element Analysis ◽  
Mutual Relations

Meshing for finite element analysis accuracy plays a very important part in numerical simulation of Periodic Symmetric Struts Support (PSSS). Different accuracy can be obtained by different element sizes or types. Three element types and eight element sizes are used for comparing the accuracy of modal analysis in this paper. Comparing with the mutual relations of different accuracy, the scientific basis is provided for selecting the correct mesh size and improves the efficiency of numerical calculation in modal analysis.

Tire Vibration Modes and Effects on Vehicle Ride Quality

1993 ◽  
Vol 21 (1) ◽  
pp. 23-39 ◽  
Author(s):  
R. W. Scavuzzo ◽  
T. R. Richards ◽  
L. T. Charek
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Operating Conditions ◽  
Modal Testing ◽  
Ride Quality ◽  
Vibration Modes ◽  
Inflation Pressure ◽  
Passenger Cars ◽  
Element Modeling ◽  
Road Surfaces

Abstract Tire vibration modes are known to play a key role in vehicle ride, for applications ranging from passenger cars to earthmover equipment. Inputs to the tire such as discrete impacts (harshness), rough road surfaces, tire nonuniformities, and tread patterns can potentially excite tire vibration modes. Many parameters affect the frequency of tire vibration modes: tire size, tire construction, inflation pressure, and operating conditions such as speed, load, and temperature. This paper discusses the influence of these parameters on tire vibration modes and describes how these tire modes influence vehicle ride quality. Results from both finite element modeling and modal testing are discussed.

Numerical Simulation of Tire Sliding Events Involving Impacts with Holes and Bumps

1986 ◽  
Vol 14 (2) ◽  
pp. 125-136 ◽  
Author(s):  
Y. Nakajima ◽  
J. Padovan
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Full Range ◽  
Arbitrary Geometry ◽  
Operating Environments ◽  
Element Simulation ◽  
Simulation Scheme

Abstract This paper extends the finite element simulation scheme to handle the problem of tires undergoing sliding (skidding) impact into obstructions. Since the inertial characteristics are handled by the algorithm developed, the full range of operating environments can be accommodated. This includes the treatment of impacts with holes and bumps of arbitrary geometry.

The study of the elastic deformation of a flexible wheel by a cam wave generator

2020 ◽  
Vol 65 (1) ◽  
pp. 51-58
Author(s):  
Sava Ianici
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Deformation ◽  
Theoretical Study ◽  
Elastic Field ◽  
The Finite Element Method ◽  
Elastic Deformations ◽  
Wave Generator ◽  
Two Stages

The paper presents the results of research on the study of the elastic deformation of a flexible wheel from a double harmonic transmission, under the action of a cam wave generator. Knowing exactly how the flexible wheel is deformed is important in correctly establishing the geometric parameters of the wheels teeth, allowing a better understanding and appreciation of the specific conditions of harmonic gearings in the two stages of the transmission. The veracity of the results of this theoretical study on the calculation of elastic deformations and displacements of points located on the average fiber of the flexible wheel was subsequently verified and confirmed by numerical simulation of the flexible wheel, in the elastic field, using the finite element method from SolidWorks Simulation.

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