scholarly journals Analysis of Dynamic Characteristics of a Propeller Blade Subjected to Large Material Removal in Milling

2020 ◽  
pp. 10-14
Author(s):  
Luyi Han ◽  
◽  
Riliang Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Behavior ◽  
Dynamic Characteristics ◽  
Material Removal ◽  
Natural Frequencies ◽  
Machining Process ◽  
Time Varying ◽  
Propeller Blade ◽  
Large Material

A propeller blade, as a typical example of low-rigidity components, is prone to chatter and deformation in machining process, especially when large material removal is applied. In order to foresee the problems and then optimize the process, identification of the dynamic behavior of the workpiece is of great importance. This paper studies the dynamic characteristics of the workpiece in the machining process from plate to propeller blade using Finite Element Method. The results show that the time-varying natural frequencies of the workpiece decrease gradually at the beginning steps of the process due to the influence of material removal, and increases afterwards influenced by the geometry of the blade.

Influence Analysis of Hull Deformation on Dynamic Behavior of Propulsion Shafting

2014 ◽  
Vol 904 ◽  
pp. 432-436
Author(s):  
Feng Bao An ◽  
Ping Yang ◽  
Xin Ping Yan ◽  
Ming Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequency ◽  
Dynamic Behavior ◽  
Natural Frequencies ◽  
Container Ship ◽  
Structure Model ◽  
The Finite Element Method ◽  
Ship Structure ◽  
Ship Propulsion

The aim of this paper is to study the influence of hull deformation on dynamic behavior of ship propulsion shafting. Taking an 8530TEU container ship as an objective and using the finite element method, a global ship structure model is built up to evaluate the hull deformations under typical loading cases. Then the hull bottom-propulsion shafting integrated model is adopted to analyze the effect of hull deformation on shafting natural frequency under dry and wet mode. The results show that the natural frequencies of the shafting will increase due to the effect of hull deformation. Consequently, it is necessary to consider the effect of ship deformation when dealing with the dynamic behavior of ship propulsion shafting.

Dynamic Characteristics of Inflatable Reflectors with Consideration of Assembly of Gores

2016 ◽  
Vol 16 (01) ◽  
pp. 1640003
Author(s):  
Bing Bing San ◽  
Li Wei Yin ◽  
Zhao Quan Zhu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Iteration Method ◽  
Shape Control ◽  
Natural Frequencies ◽  
Nonlinear Finite Element ◽  
Mode Shapes ◽  
Nonlinear Finite Element Method ◽  
Subspace Iteration

This paper focuses on the dynamic characteristics of reflectors considering the effects of assembly of gores. A model is established to properly predict the assembled shape of planar gores, and nonlinear finite element method and subspace iteration method are adopted to analyze the dynamic characteristics of reflectors. A comparative study is carried out based on the dynamic analysis with ideal reflector and assembled reflector to illustrate the impacts of assembly on mode shapes and natural frequencies of the reflectors. The results show that the presence of assembly of gores and seaming tapes has significant effects on mode shapes and natural frequencies of reflectors, which will influence the shape control of reflectors.

Investigations Into the Experimental and Numerical Simulation of a Shaping Machine

1996 ◽  
Author(s):  
Vijay Reddy ◽  
P. T. Rajeev ◽  
V. Ramamurti ◽  
R. Madhusudan
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Mechanical Model ◽  
Material Removal ◽  
Machining Accuracy ◽  
Acceleration Response ◽  
Shell Elements ◽  
Optimal Machine

Abstract One of the main requirements for efficient and economical material removal is optimal machine tool design. The main objective of this paper is to investigate the dynamic characteristics of a shaping machine using finite element method. In the first part, experimentation and computation are combined to formulate and validate the mechanical model of the shaper. A parametric study is done in the second part. The main housing along with the ram of a typical shaper is analyzed during the process of shaping. This assembly is modeled using triangular shell elements. The eigenvalues and the eigenvectors are obtained. There is an acceptable degree of agreement between analytical results and the experimental observations. The cutting force is determined experimentally and using this the response of the shaping machine is determined. The dynamic acceleration response so obtained is compared with the experimentally obtained response. An exhaustive stress analysis is done. The system is sensitive to changes in certain parameters which are identified and analyzed, with optimization of the structural weight and machining accuracy being the criteria.

Time-Varying Chatter Frequency Characteristics in Thin-Walled Workpiece Milling With B-Spline Wavelet on Interval Finite Element Method

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Chenxi Wang ◽  
Xingwu Zhang ◽  
Xuefeng Chen ◽  
Hongrui Cao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Material Removal ◽  
Modal Parameters ◽  
Time Varying ◽  
Spline Wavelet ◽  
B Spline ◽  
Interval Finite Element Method ◽  
Thin Walled ◽  
Element Method

As the most significant material removal method, milling plays a very important role in the manufacturing industry. However, chatter occurs frequently in milling, which will seriously affect the production efficiency. The accurate prediction of chatter frequency can contribute to chatter monitoring and the design of the controller for chatter mitigation. During thin-walled workpiece milling under chatter, a new phenomenon of time-varying chatter frequency is discovered and explained in this paper. This phenomenon can be explained as follows, with the workpiece material removal, the modal parameters change during thin-walled milling, which can cause the continuous change of chatter frequency. In order to predict the varying modal parameters, this paper provided an efficient tool, the B-spline wavelet on interval finite element method (BSWIFEM), which can possess the material removal problem more accurately and more rapidly. Based on the calculated modal parameters, the time-varying chatter frequency can be obtained with the chatter frequency calculation formulas. To verify the calculated results, a number of milling tests are implemented on thin-walled parts. The experimental results show that the calculated chatter frequency is in good agreement with the measured chatter frequency, which validates the effectiveness of the proposed method.

Finite Element Modality Analysis of Face Gear

2013 ◽  
Vol 278-280 ◽  
pp. 299-302
Author(s):  
Zhi Wang ◽  
Qing Chen ◽  
Jia Chun Lin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Response ◽  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Face Gear ◽  
Simulation Based ◽  
The Face ◽  
Element Method

For improving the dynamic characteristics and reliability of the face gear, the finite element of the face gear was established with NX Advanced Simulation based on the theory of vibration mechanics and finite element method. the former 12 ranks of natural frequencies and shapes were calculated by using NX. Nastran solver, The results provided a direct theoretic basis for improving the design of the face gear. And it laid a foundation of dynamic response calculation of face gear at the same time.

scholarly journals Modeling and Eigenfrequency Analysis of Sound-Structure Interaction in a Rectangular Enclosure with Finite Element Method

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
Samira Mohamady ◽  
Raja Kamil Raja Ahmad ◽  
Allahyar Montazeri ◽  
Rizal Zahari ◽  
Nawal Aswan Abdul Jalil
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequencies ◽  
Active Noise Control ◽  
Interior Noise ◽  
Rectangular Enclosure ◽  
Sound Structure ◽  
Flexible Panel ◽  
Experimental Works ◽  
Element Method

Vibration of structures due to external sound is one of the main causes of interior noise in cavities like automobile, aircraft, and rotorcraft, which disturb the comfort of passengers. Accurate modelling of such phenomena is required in eigenfrequency analysis and in designing an active noise control system to reduce the interior noise. In this paper, the effect of periodic noise travelling into a rectangular enclosure is investigated with finite element method (FEM) using COMSOL Multiphysics software. The periodic acoustic wave is generated by a point source outside the enclosure and propagated through the enclosure wall and excites an aluminium flexible panel clamped onto the enclosure. The behaviour of the transmission of sound into the cavity is investigated by computing the modal characteristics and the natural frequencies of the cavity. The simulation results are compared with previous analytical and experimental works for validation and an acceptable match between them were obtained.

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