Computer Aided Engineering Approach to the Development of a Lawnmower Blade: A Reverse Engineering Application to Reduce Noise Levels (original) (raw)
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West Indian Journal of Engineering, 2017
This study involved the design and development of a low-noise lawnmower blade using virtual modeling tools and Rapid Prototyping (RP) principles. Computer Aided Design (CAD) and Computer Aided Engineering (CAE) tools and techniques were used to generate an optimised model of the original lawnmower blade which was prototyped using a Fused Deposition Modelling (FDM) machine. The prototype generates lower noise levels than the original blade and the virtual modeling tools are adequate enough to predict the noise levels of the proposed blade design. Furthermore, the use of RP technology in the fabrication of the blade has potential to reduce developmental cost and time.
Computational Fluid Dynamics and Finite Element Analysis of a Lawn Mower Mulching Blade Optimization
buet.ac.bd
Computational fluid dynamics (CFD) and Finite Element Analysis (FEA) were performed on a lawn mower mulching blade to optimize the blade design through increasing the lift force and decreasing aero-acoustic noise. The analysis of the current lawn mower blade included fluid dynamics around selected 2-D blade cross-sections at different positions down the length of the blade, blade structural stress and modal analysis. Then, a concept blade attempting to improve the current design was proposed and analyzed compared to the original design. The results showed a significant reduction in turbulent kinetic energy relating to aero-acoustic noise. A reduction in structural loading was also observed, due in part to a reduction in the pressure gradient near the outer cutting region. The loss of the lifting potential was compensated by using an added vertical section at the end of the blade and a chamfer on the edges at the inner radiuses.
IJERT-Design and Analysis of Cutting Blade for Rotary Lawn Mowers
International Journal of Engineering Research and Technology (IJERT), 2016
https://www.ijert.org/design-and-analysis-of-cutting-blade-for-rotary-lawn-mowers https://www.ijert.org/research/design-and-analysis-of-cutting-blade-for-rotary-lawn-mowers-IJERTV5IS040322.pdf Lawn mowers are machines used to level grass in lawns for maintaining the aesthetic beauty and for recreational purposes. The design of various parts of a rotary lawn mower has been covered in a previous journal entitled "Design and Analysis of Rotary Lawn Mower", but the cutting blade being one of the most important part of the rotary lawn mower hasn't been covered in it. Here we are trying to design a cutting blade for the same mower design mentioned earlier. The existing blade designs were studied and analyzed. Improvements were made for the existing design, FLUENT and Static Structural analysis were carried out with the help of ANSYS Workbench in order to develop a new design.
Static Structural Analysis of Rotary Weeding Blades using CAD Software.
International Journal of Engineering Sciences & Research Technology, 2014
Rotary weeding blade is one of the important component for a tractor operated rotary weeder and need to be designed in such a way that they have enough strength in order to avoid the unbalancing force on the rotary weeder. The application of computer aided design (CAD) for structural analysis of rotary weeding blades on the basis of finite element method was carried out using ANSYS-software for three types of weeding blades viz., L, C and J-type. The different types of weeding blades are geometrically constrained with preparation of solid model and the simulation is done with actual field performance rating parameters along with boundary conditions. Prediction of stress distributions among the blades is important for the designers and manufacturers in order to minimize the errors and breakdowns. The analysis showed that, the maximum and minimum principal stresses were found to be 439.35 and 9.09 MPa respectively with a total deformation of 3.05 mm for L-type blade. Whereas for C-type blade, these values were 729.9 and 38.84 MPa respectively with a 4.65 mm total deformation. While the maximum and minimum principal stresses for J-type blade were found to be 362.68 and 17.7 MPa respectively with a total deformation of 1.65 mm. It was observed that, the stress values were within the limits of the yield stress of the material (758 MPa). Hence, the blades designed and selected for the study could be adopted for the development of the rotary weeder.
Design Optimization Parameters for Tractor Mounted Mulcher Blades
This paper aims to introduce a finite element model to investigate the performance of different Tractor Mounted Mulcher blades. The continuous fluctuating impact of soil crust, clods, stone and fronds develops high stress areas on the blade tip or blade cutting edges. Four types of blades for tractor mounted drawn rotary Mulcher were designed and developed. Computer Aided Design package for designing of the blade and Solid Works were used for the simulation and optimization of the blades. Based on the simulation results, optimized design of blade was suggested. It is imperative to optimize the design of blade so that bestdesign experiences less stress and thereby reduces wear. From the results, effects of the Tractor Mounted Mulcher Blades geometry on blades performance were studied and the results were verified as Blade IV (900) had the least stress and deformation (1.28x103 MN and 4.5x10-3m) while Blade II (Curved) had the highest stress and deformation (4.07x103MN and 1.15x10-2m) respectively. To finalize the selection of the optimized blade, a field experiment would be conducted to know the effect of pulverization, level of torque, fuel consumption on the blades and noise and vibration effects on the operator
Steel Work Design and Analysis of a Manual Lawn Mower
This work presented the design and construction of a manually powered lawn mower as well as the stress analysis of the blade. The solid model of the lawn mower design was done using Solid works software. The materials utilized for the construction were selected following standard material selection processes. The required cutting speed was achieved by proper gear arrangement which transferred the rational motion of the wheels to the blade, consequently increasing the speed by about 300%. The average cutting capacity of the lawn mower is 62.48 m 2 /hr. The stress analysis on the blade using the simulation tool of the solid works software gave a maximum von mises stress that is 252 times less than the yield strength of the blade material. Also, a maximum deformation of 0.00271mm obtained from the analysis is quite infinitesimal hence, the blade can withstand both stress and deformation resulting from the cutting operation.
IJERT-Design and Analysis of Rotary Lawn Mower
International Journal of Engineering Research and Technology (IJERT), 2016
https://www.ijert.org/design-and-analysis-of-rotary-lawn-mower https://www.ijert.org/research/design-and-analysis-of-rotary-lawn-mower-IJERTV5IS040152.pdf KAMCO Industries, Athani, India is a reputed industry undertaken by Kerala state government producing farm and agro-machinery used all over India. KAMCO has a product line up of several farm and agro machineries, but has not produced Lawn Mowers. We are trying to put forward a simple lawn mower design which can be added to the product lineup of KAMCO with minimal cost. Here we have focused on simplifying the design of existing lawn mowers. Simple mechanisms for height adjustments and grass collection has been employed for usability and cost reduction. The frame and height adjustment module has been analyzed with the help of ANSYS Workbench and conclusions have been made
Computer Software Application in the Development of Agricultural Machine Design
Traditionally, artisans carried out designing of agricultural tractors and implement, which is laborious, time-consuming and less efficient. Currently, computer and software application technologies are developing rapidly in the tractor and implement design applications as it is in many areas. One of these is SolidWorks, a three-dimensional solid modelling design program that is most commonly used and open to development in the design of agricultural tractors, implement and analysis in the windows applications. In this work, the design of four tractor-mounted mulcher blades models was performed in 2D and 3D and simulated using the general features of the software. The results from the simulation show that Blade with 120 o lifting angle has the lowest stress and deformation whilst the Blade with 150 o lifting angle has the highest when compared with the yield point of the material (62.04 MPa). It is recommended that Blade with 120 o lifting angle for tractor-mounted mulcher should be used for mulching oil palm fronds.
Noise characteristics of grass-trimming machine engines and their effect on operators
Noise and Health, 2009
Over the last few years, interaction of humans with noisy power-driven agricultural tools and its possible adverse after effects have been realized. Grass-trimmer engine is the primary source of noise and the use of motorized cutter, spinning at high speed, is the secondary source of noise to which operators are exposed. In the present study, investigation was carried out to determine the effect of two types of grass-trimming machine engines (SUM 328SE and BG 328) noise on the operators in real working environment. It was found that BG-328 and SUM-328SE produced high levels of noise, of the order of 100 and 105 dB(A), respectively, to which operators are exposed while working. It was also observed that situation aggravates when a number of operators simultaneously operate resulting in still higher levels of noise. Operators should be separated 15 meters from each other in order to avoid the combined level of noise exposure while working with these machines. It was found that SPL, of the grass-trimmer machine engines (BG-328 and SUM-328SE), were higher than the limit of noise recommended by ISO, NIOSH, and OSHA for an 8-hour workday. Such a high level of noise exposure may cause physiological and psychological problems to the operators in long run.
Optimum Material Evaluation for Gas Turbine Blade Using Reverse Engineering (RE) and FEA
Procedia Engineering, 2014
Gas turbines play a major role in the field of aviation owing to their high power to weight ratio and being self-contained, as compared to other conventional power generating units. The main function of the blades in gas turbines is imparting energy to, or extracting it, from a fluid stream. Since the underlying function of the blades is to smoothly change the velocity of fluid flow, they are generally comprised of parametric sculptured surface models. In absence of design data, the reverse engineering process can be considered as a major tool for modeling. Reverse engineering process involves sensing the geometry of existing part, creating a geometric model of the part from the sensed data and passing this model to an appropriate CAD/CAM system for manufacturing. This paper mainly deals with the modeling and analysis of gas turbine blades. The design data for a turbine blade is obtained using Reverse Engineering technique. Using the data so obtained, a model of the turbine blade is created in ANSYS FEA package. For the given loading conditions, the blade is analyzed for static structural analysis for different materials at varying centrifugal loads and different materials and a safe and feasible material is suggested.