The Analysis of Dynamic Characteristics in Reduction of the Circular Saw Idling Noise

2011 ◽  
Vol 228-229 ◽  
pp. 477-483
Author(s):  
Xiao Ling Wang ◽  
Zhong Jun Yin ◽  
Chao Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
The Finite Element Method ◽  
Uniform Thickness ◽  
The Core ◽  
Circular Saw ◽  
Damping Material ◽  
Circular Saw Blade ◽  
Damping Materials ◽  
Saw Blade

We investigate the natural frequency and the amplitude of circular saw blades during idling. We use four blades in the paper: 1) The traditional circular saw blades, 2) The circular saw blade with damping materials which is distributed in the core of blade, and the circular saw blade has a uniform thickness, 3) Similar to the above one but the circular saw blade has a non-uniform thickness, the damping region is thicker than other region of the circular blade, 4) the circular saw blade with damping material which is distributed around the core of blade by four small circular regions. We adopt the Finite Element Method in our numerical analysis. Our analytical results are very useful for a better design of circular saw blades.

The Influence of Tangential Roller Pressure on the Stability of Circular Saw Blade

2014 ◽  
Vol 614 ◽  
pp. 32-35 ◽  
Author(s):  
Ming Song Zhang ◽  
Yi Zhang ◽  
Jian Jun Ke ◽  
Xiao Wei Li ◽  
Lian Bing Cheng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Symmetric Model ◽  
The Finite Element Method ◽  
Circular Saw ◽  
The Face ◽  
Circular Saw Blade ◽  
Cyclic Symmetric ◽  
The Stability ◽  
Saw Blade

The finite element method was used to study tangential roller method impact on the stability of circular saw blade. Using 30 ° cyclic symmetric model is analyzed. The results show that the tension of the saw blade is not the same, and tensioning effect is different, when the tangential roller pressure is not same. At the same time, after tangential roller, the face run out of saw blade is small, which show that the smoothness of tangential roller is better.

Influence of Radial Slots on the Vibration Characteristics of Circular Saw Blade

2012 ◽  
Vol 226-228 ◽  
pp. 232-236
Author(s):  
Yuan Li
Keyword(s):  
Finite Element Method ◽  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Matrix Perturbation ◽  
The Finite Element Method ◽  
Cutting Stability ◽  
Circular Saw ◽  
D’Alembert Principle ◽  
Circular Saw Blade ◽  
Saw Blade

In order to improve thin circular saw blade’s cutting stability, it’s nonlinear dynamic incremental equilibrium equation was obtained according to nonlinear vibration theory and D’Alembert principle. It could be concluded from the above equation that cutting several radial slots on the circumference of the saw blade will cause significant change of dynamic characteristics of the saw blade. This thesis, employing the finite element method and matrix perturbation principle, calculated and studied respectively the effect of number, length and width of the radial slots on natural frequencies of the saw blade. Results show that number and length have distinct influence on natural frequencies but hardly does width have. So proper choice of number, length and width of the radial slots can improve effectively the dynamic characteristics of the saw blade.

scholarly journals COMPARISON OF SAW BLADE NATURAL FREQUENCIES AND CRITICAL SPEEDS USING CSAW AND FINITE ELEMENT ANALYSIS

2011 ◽  
Author(s):  
J. Poirier ◽  
P. Radziszewski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequencies ◽  
Element Model ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Saw Blade ◽  
Circular Saws ◽  
The Finite Element Model ◽  
Element Method

The natural frequencies of circular saws limit the operating speeds of the saws. Current industry methods of increasing natural frequency include pretensioning, where plastic deformation is induced into the saw. To better model the saw, the finite element model is compared to current software for steel saws; C-SAW, a software program that calculates frequencies for stiffened circular saws. Using C-SAW and the finite element method the results are compared and the finite element method is validated for steel saws.

Diamond Circular Saw Blades Noise Attenuation and Finite Element Modal Analysis

2013 ◽  
Vol 444-445 ◽  
pp. 129-133 ◽  
Author(s):  
Ming Song Zhang ◽  
Pu Xian Zhu ◽  
Jian Jun Ke ◽  
Yi Kuan Zhu
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Slot Width ◽  
Noise Attenuation ◽  
Circular Saw ◽  
Slot Length ◽  
Circular Saw Blade ◽  
Saw Blade

The finite element modal analysis was used to study natural frequency of circular saw blade, when slotted. Finding the frequency of slotted is smaller than no slotted saw blade, showing that slot can have the effect of noise attenuation. The increasing of slot length, slot width, slot position, slot number can reduce the natural frequency of circular saw blade on the whole. The orthogonal text was used to study slot parameters. Finding that slot parameters’ influence of primary and secondary relations on saw blade first five natural frequency is slot position > slot number> slot length > slot width.

scholarly journals 3D field analysis in 3-phase amorphous modular transformer under increased frequency operation

2015 ◽  
Vol 64 (1) ◽  
pp. 119-127 ◽  
Author(s):  
Bronisław Tomczuk ◽  
Dariusz Koteras
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Distribution ◽  
Power System ◽  
Infrared Camera ◽  
Field Analysis ◽  
The Finite Element Method ◽  
Core Surface ◽  
Calculated Temperature ◽  
The Core

Abstract The calculations results of the temperature distribution in a 3-phase transformer with modular amorphous core are presented. They were performed for two frequency values which were higher than the power system one. For the 3D field analyses the Finite Element Method (FEM) was used. The calculated temperature at the points of the core surface has been verified using an infrared camera.

Stability of eccentric core–annular flow

1995 ◽  
Vol 282 ◽  
pp. 233-245 ◽  
Author(s):  
Adam Huang ◽  
Daniel D. Joseph
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
The Finite Element Method ◽  
Two Phase ◽  
Two Fluids ◽  
The Core ◽  
Steady Solutions ◽  
Fluid Dynamics Equations ◽  
Concentric Flow ◽  
Element Method

Perfect core-annular flows are two-phase flows, for example of oil and water, with the oil in a perfectly round core of constant radius and the water outside. Eccentric core flows can be perfect, but the centre of the core is displaced off the centre of the pipe. The flow is driven by a constant pressure gradient, and is unidirectional. This kind of flow configuration is a steady solution of the governing fluid dynamics equations in the cases when gravity is absent or the densities of the two fluids are matched. The position of the core is indeterminate so that there is a family of these eccentric core flow steady solutions. We study the linear stability of this family of flows using the finite element method to solve a group of PDEs. The large asymmetric eigenvalue problem generated by the finite element method is solved by an iterative Arnoldi's method. We find that there is no linear selection mechanism; eccentric flow is stable when concentric flow is stable. The interface shape of the most unstable mode changes from varicose to sinuous as the eccentricity increases from zero.

Micro FEM Simulations of Single-Cutting-Edge Sawing of Cortical Bone

2013 ◽  
Author(s):  
Ilige S. Hage ◽  
Ramsey F. Hamade
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cortical Bone ◽  
Orthogonal Cutting ◽  
Optical Microscope ◽  
Depth Of Cut ◽  
The Finite Element Method ◽  
Coupled Neural Networks ◽  
Saw Blade ◽  
Element Method

The finite element method at the micro scale (mFEM) has been gaining in popularity to simulate biomechanical effects. In this paper, a 3D mFEM model is developed to simulate sawing of cortical bone under 2D orthogonal cutting conditions. The aim of the research was to develop a predictive model of the sawing forces and to report them as a function of depth of cut. To obtain the micro geometric input, a heterogeneous anisotropic model was created from several images taken via an optical microscope of the cortex of adult mid-diaphysal bovine femur. In order to identify the various regions representing the micro-architecture of cortical bone, such as osteons, Haversian canals, lamellae and lacunae, MATLAB was utilized for intelligent image processing based on pulsed coupled neural networks. After each micro-phase in the image was assigned the proper mechanical properties, these material-tagged micro-features were imported into the finite element method (FEM) solver. Results from the simulation were correlated to cutting force data that was determined experimentally. Experiments were conducted with individual stainless steel saw blade teeth that were removed from a typical surgical saw blade. The teeth were 0.64 mm thick, with a rake and clearance angle of −10 and 60 degrees, respectively. Representative of clinical conditions for power bone sawing, depths of cut per tooth between 2.5 micrometer and 10 micrometer were investigated. The simulated cutting forces from the mFEM model compared favorably to the experimental data.

scholarly journals Characteristics of self-excited alternate-tooth vibration of circular saw blade

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3840-3850
Author(s):  
Ken Takeyama ◽  
Hideyuki Yokochi ◽  
Satoru Nishio ◽  
Satoru Tsuchikawa
Keyword(s):  
Solid Wood ◽  
Vibration Modes ◽  
The Finite Element Method ◽  
Cutting Resistance ◽  
Circular Saw ◽  
Cutting Surface ◽  
Speed Range ◽  
Circular Saw Blade ◽  
Saw Blade ◽  
Cutting Experiments

In recent years, circular saw blades with thinner kerfs have been in high demand for improvement of the production yield of wood-based materials and the reduction of sawdust. In the case of ripping of solid wood, the number of teeth of a circular saw blade is normally set to 40 or 50, with a diameter of 305 mm, which allows less cutting resistance and smooth exhausting of sawdust. However, at certain rotational speeds, self-excited alternate-tooth vibration can easily occur in circular saw blades with such thin kerfs and so few teeth. Therefore, the cutting surface quality tends to be worse. In this study, the mechanism of this self-excited alternate-tooth vibration was clarified. The vibration mode and frequency were predicted by the finite element method. In addition, a circular saw blade with a body thickness 1.5 mm and 50 teeth was employed for wood-cutting experiments. The rotational speed range of the self-excited alternate-tooth vibration modes and their frequencies were investigated. When a double of the tooth passage frequency was slightly higher than the frequencies of the alternate-tooth vibration modes, an alternate-tooth vibration of the regenerative chatter type was excited, owing to the forces on the sides of the tooth.

scholarly journals Influence Metal Berylliumof the Optical FiberCoreon plasmonic Properties

2021 ◽  
Vol 2114 (1) ◽  
pp. 012008
Author(s):  
Hussein Taqi John
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Refractive Index ◽  
Mathematical Program ◽  
Propagation Constant ◽  
Comsol Multiphysics ◽  
Power Ratio ◽  
The Finite Element Method ◽  
The Core ◽  
Beryllium Metal

Abstract The paper include, the properties of the plasmonic optical fiber in which the core is beryllium metal were studied, were we studied the effect of this metal on the plasmonic fiber, and a mathematical program was used which is COMSOL MULTIPHYSICS, which depends on the finite element method (FEM) to deduce the first three modes and the effective refractive index, neff accompanying each wavelength. It was observed that when order the mode is increased, the lobes will increase, where the mode, LP 01 is one spot and the mode, LP11 are two spots and the mode, LP21 are four spots. An increase in the power indicator is increase red and yellow, and this applies to all modes. That is, by controlling the radius of the fiber core and the wavelength, it is possible to equilibrium the power ratio that propagates forward and backward. The neff , attenuation coefficient and propagation constant for different wavelengths and core radii for the first three modes were also studied. In all cases, we got the higher values when the wavelengths are small the value, and then these values begin to reduction at increasing wavelength.

Dynamic Analysis of Metal Circular Saw Blade

2014 ◽  
Vol 496-500 ◽  
pp. 222-226 ◽  
Author(s):  
Xin Tan ◽  
Hu Huang ◽  
Lin Chen ◽  
Qing Bin Zhang
Keyword(s):  
Finite Element ◽  
Cutting Parameters ◽  
Element Analysis ◽  
Circular Saw ◽  
Circular Saw Blade ◽  
Stress And Deformation ◽  
Dynamics Calculation ◽  
Saw Blade ◽  
Sawing Process

During the sawing process of cold sawing machine, it emergences of blade wear too fast, the current is too large, sawing not high quality of rolled products,Be aimed at those problem, the paper established the finite element of side shake structure saw blade and ordinary flat blade model, and using the ANSYS finite element analysis software to make the dynamics calculation about the two kinds of saw blade. Through the analysis and comparison of backlash saw blade and natural frequency, different cutting parameters effect of stress and deformation of the saw tooth transient, and the simulation results will be applied to the field of sawing testsThe results show that the backlash saw blade in the vibration characteristics, performance and other aspects of the force and deformation are improved compared with the ordinary blade

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