Dynamic Analysis of Electric Spindle Based on ANSYS

2013 ◽  
Vol 288 ◽  
pp. 75-79
Author(s):  
Ling Ling Zhang ◽  
Xiao Yu Qin
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Rotational Speed ◽  
Optimization Design ◽  
Natural Frequencies ◽  
Resonance Phenomenon ◽  
Finite Model ◽  
Static Stiffness ◽  
Harmonic Response ◽  
Critical Rotational Speed

Building a finite model of the electric spindle by ANSYS. Using Lanczos to extract first 4 natural frequencies and vibration models of the spindle, and using Harmonic response analytic methods to obtain dynamic response in different excitation of electric spindle .The results show that the static stiffness of electric spindle can meet the requirements, because the highest work speed of Spindle is far away from the critical rotational speed, it can avoid the resonance phenomenon effectively. It lays the foundation of Optimization design and Remanufacturing of the spindle.

scholarly journals The Shapes of Teeth of Circular Saw Blade and Their Influence on its Critical Rotational Speed

2015 ◽  
Vol 63 (2) ◽  
pp. 399-403 ◽  
Author(s):  
Adam Droba ◽  
Ján Svoreň ◽  
Ján Marienčík
Keyword(s):  
Adverse Effects ◽  
Rotational Speed ◽  
Natural Frequencies ◽  
Computer Software ◽  
Variable Parameter ◽  
Circular Saw ◽  
Critical Rotational Speed ◽  
Circular Saw Blade ◽  
Saw Blade ◽  
High Level

The main problems during cutting with circular saw blade are inaccurate cut, low quality of surface, high level of noise. These adverse effects are related to oscillation of circular saw blade. This oscillation cause adverse effects not only on workpiece but also on tool. In some case the circular saw blade reaches the value of critical rotational speed which leads to its instability and cause the oscillation of blade which may leads to destruction of tool. So the reduction of the amplitude of oscillation is essential for removing the adverse effects. This paper deals about influence of shapes of teeth as a type of modification that has positive effect oncritical rotational speed of circular saw blade. The parameters of studied models of circular saw blade were 42 number of teeth and the height of teeth with slice from sintered carbide was 14 mm. The variable parameter was the ratio between surface of teeth and surface of teeth gap. In this study was used computer software Creo Parametric 1.0 for obtaining natural frequencies of studied models. This software uses in analysis finite element method (FEM). There were done some steps to idealize the models. For calculating static and dynamics natural frequencies of modelswere used modal analysis. The critical rotational speed was calculated from obtained results by Creo Parametric 1.0 and compared on 5 models of tool.

Dynamic Analysis and Optimization of Machine Tool in Consideration of Joint Parameters

2011 ◽  
Vol 697-698 ◽  
pp. 320-325
Author(s):  
C. Xu ◽  
Z.J. Wu ◽  
J.F. Zhang ◽  
P.F. Feng ◽  
D.W. Yu
Keyword(s):  
Machine Tool ◽  
Dynamic Analysis ◽  
Modal Analysis ◽  
Dynamic Characteristic ◽  
Dynamic Model ◽  
Optimization Design ◽  
Model Simulation ◽  
Harmonic Response ◽  
Machining Center ◽  
Joint Parameters

This paper provides the methodology on analyzing the dynamic characteristic of machine tool in consideration of joint parameters. To ensure the dynamic model is available for further study, modal experiment for vertical machining center is involved. The machine tool is divided into several parts and connected with spring and damping for substructure modeling. Particularly, the bolt-fixed joint is an example for the joints modeling. Based on the dynamic model, simulation of modal analysis and harmonic response are carried out. Besides, method of optimization design of column and milling box is given to improve the performance, which is proved to be feasible in harmonic response.

Cross-Well Dynamics of Bistable Cross-Ply Laminates

2019 ◽  
Author(s):  
Samir A. Emam ◽  
Daniel J. Inman
Keyword(s):  
Dynamic Response ◽  
Composite Laminates ◽  
Room Temperature ◽  
Natural Frequencies ◽  
Period Doubling ◽  
Excitation Amplitude ◽  
Frequency Sweep ◽  
Resonant Frequencies ◽  
Harmonic Response ◽  
Single Well

Abstract This paper presents an experimental analysis of the dynamic response of bistable composite laminates that are harmonically excited. Bistable composite laminates are unsymmetric thin laminates that possess two self-equilibrated positions at room temperature. The resonant frequencies of bending under small harmonic excitations have been identified to serve as natural frequencies of the underlying linear system. Amplitude sweep and frequency sweep have been performed and the plate’s dynamics has been identified and analyzed. Four-ply and eight-ply laminates have been tested and showed similar behavior. The main conclusion is that when the cross-ply bistable laminates are harmonically excited and either the excitation amplitude or resonant frequency is varied, the single-well dynamic response experiences a period-doubling bifurcation and a cross-well harmonic response is obtained. Chaotic cross-well response was also identified.

scholarly journals Multibody approach for the dynamic analysis of gears transmission for an electric vehicle

2016 ◽  
Vol 232 (1) ◽  
pp. 57-65 ◽  
Author(s):  
G Belingardi ◽  
V Cuffaro ◽  
F Curà
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Frequency Response ◽  
Electric Vehicle ◽  
Rotational Speed ◽  
Frequency Response Function ◽  
Transmission Error ◽  
Gear Ratio ◽  
Multibody Model ◽  
Gear Transmission System

The dynamic analysis of a gear transmission system for electric vehicle is analyzed by means of a multibody approach. The architecture of the transmission is constituted of one gear ratio, with the differential integrated in the same gear box. The multibody model of the complete transmission has been created and optimized in order to get the dynamic response of the system. In particular, the frequency response function of the system in terms of rotational speed and loading forces has been determined. Furthermore, the dynamic transmission error has also been determined.

Dynamic Analysis on Crank-Slider Mechanism of Reciprocating Pump

2011 ◽  
Vol 697-698 ◽  
pp. 676-680
Author(s):  
Z.G. Han ◽  
Qing Jian Liu
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Model ◽  
Dynamic Behavior ◽  
Rotational Speed ◽  
Analysis And Design ◽  
Numerical Example ◽  
Body Dynamics ◽  
Reciprocating Pump ◽  
Multi Body

The crank-slider mechanism is the key component in reciprocating pumps. With the increase of the rotational speed of the crank-slider mechanism, the vibration and working noise of reciprocating pumps increase. Based on the multi-body dynamics theory, the dynamic model of the crank-slider mechanism of reciprocating pumps is proposed. A numerical example is given and the validity of the procedure developed here is demonstrated by analyzing the dynamic behavior of a typical crank-slider mechanism of the reciprocating pump. The model can well simulate the dynamic response of the mechanism, which can enable designers to obtain required information on the analysis and design of reciprocating pumps.

DYNAMIC BEHAVIOR OF TELESCOPIC CRANES BOOM

2013 ◽  
Vol 13 (01) ◽  
pp. 1350010 ◽  
Author(s):  
IOANNIS G. RAFTOYIANNIS ◽  
GEORGE T. MICHALTSOS
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Analytical Model ◽  
Constant Velocity ◽  
Steel Beam ◽  
Continuum Approach ◽  
Theoretical Formulation ◽  
Modal Superposition ◽  
Superposition Technique

Telescopic cranes are usually steel beam systems carrying a load at the tip while comprising at least one constant and one moving part. In this work, an analytical model suitable for the dynamic analysis of telescopic cranes boom is presented. The system considered herein is composed — without losing generality — of two beams. The first one is a jut-out beam on which a variable in time force is moving with constant velocity and the second one is a cantilever with length varying in time that is subjected to its self-weight and a force at the tip also changing with time. As a result, the eigenfrequencies and modal shapes of the second beam are also varying in time. The theoretical formulation is based on a continuum approach employing the modal superposition technique. Various cases of telescopic cranes boom are studied and the analytical results obtained in this work are tabulated in the form of dynamic response diagrams.

Dynamic Analysis of Planetary Gear Reducer

2018 ◽  
Vol 880 ◽  
pp. 87-92
Author(s):  
Daniela Vintilă ◽  
Laura Diana Grigorie ◽  
Alina Elena Romanescu
Keyword(s):  
Finite Elements ◽  
Differential Equations ◽  
Dynamic Analysis ◽  
Frequency Response ◽  
Planetary Gear ◽  
Resonance Phenomenon ◽  
Superposition Method ◽  
Planetary Gears ◽  
Tower Crane ◽  
Systems Of Differential Equations

This paper presents dynamic analysis of a three stage planetary gear reducer for operate a tower crane. Ordinary and planetary gears have been designed respecting the coaxial, neighboring and mounting conditions. Harmonic analysis has been processed to identify frequency response for displacements, strains and deformations. The aim of the study was to determine critical frequencies to avoid mechanical resonance phenomenon. The obtained results are based on the superposition method for solving the systems of differential equations resulting from the analysis with finite elements.

scholarly journals Modal analysis of an iced offshore composite wind turbine blade

2021 ◽  
pp. 0309524X2110116
Author(s):  
Oumnia Lagdani ◽  
Mostapha Tarfaoui ◽  
Mourad Nachtane ◽  
Mourad Trihi ◽  
Houda Laaouidi
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Turbine Blade ◽  
Natural Frequencies ◽  
Wind Turbine Blade ◽  
Resonance Phenomenon ◽  
Mode Shapes ◽  
The Finite Element Method ◽  
Numerical Work ◽  
Composite Blades

In the far north, low temperatures and atmospheric icing are a major danger for the safe operation of wind turbines. It can cause several problems in fatigue loads, the balance of the rotor and aerodynamics. With the aim of improving the rigidity of the wind turbine blade, composite materials are currently being used. A numerical work aims to evaluate the effect of ice on composite blades and to determine the most adequate material under icing conditions. Different ice thicknesses are considered in the lower part of the blade. In this paper, modal analysis is performed to obtain the natural frequencies and corresponding mode shapes of the structure. This analysis is elaborated using the finite element method (FEM) computer program through ABAQUS software. The results have laid that the natural frequencies of the blade varied according to the material and thickness of ice and that there is no resonance phenomenon.

Response of Liquid in Cylindrical Tank with Rigid Annual Baffle Considering Damping Effect

2011 ◽  
Vol 255-260 ◽  
pp. 3687-3691 ◽  
Author(s):  
Jia Dong Wang ◽  
Ding Zhou ◽  
Wei Qing Liu
Keyword(s):  
Free Surface ◽  
Dynamic Response ◽  
Potential Function ◽  
Natural Frequencies ◽  
Damping Ratio ◽  
Cylindrical Tank ◽  
Generalized Coordinates ◽  
Damping Effect ◽  
Total Potential ◽  
Free Surface Wave

Sloshing response of liquid in a rigid cylindrical tank with a rigid annual baffle under horizontal sinusoidal loads was studied. The effect of the damping was considered in the analysis. Natural frequencies and modes of the system have been calculated by using the Sub-domain method. The total potential function under horizontal loads is assumed to be the sum of the tank potential function and the liquid perturbed function. The expression of the liquid perturbed function is obtained by introducing the generalized coordinates. Substituting potential functions into the free surface wave conditions, the dynamic response equations including the damping effect are established. The damping ratio is calculated by Maleki method. The liquid potential are obtained by solving the dynamic response equations of the system.

Accelerometer correction for the dynamic analysis of damped multi-degree of freedom systems

1969 ◽  
Vol 59 (4) ◽  
pp. 1591-1598
Author(s):  
G. A. McLennan
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Degrees Of Freedom ◽  
Degree Of Freedom ◽  
Exact Method ◽  
Three Degrees Of Freedom

Abstract An exact method is developed to eliminate the accelerometer error in dynamic response calculations for damped multi-degree of freedom systems. It is shown that the exact responses of a system can be obtained from the approximate responses which are conventionally calculated from an accelerogram. Response calculations were performed for two typical systems with three degrees of freedom for an assumed pseudo-earthquake. The results showed that the approximate responses may contain large errors, and that the correction developed effectively eliminates these errors.

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