Method for aerodynamic noise analysis based on computer value-assisted simulation

Abstract

A method for aerodynamic noise analysis based on computer value-assisted simulation aims at using a computer to perform a 'numerical experiment', theoretically reproducing the physical process, obtaining the numerical simulation advantages of low cost, easy data acquisition and theoretical problem analysis compared with the experiment, achieving the effects of continuous calculation period shortening and more and more accurate calculation results with development of the computer and a model, using FLUENT fluid data to calculate a fluid in a rotary machine and an MRE model, considering a variable velocity field, a pressure field and turbulence energy, using LMS Virtual lab software to obtain a noise spectrum, analyzing a noise source and acquiring noise data to reduce noise. A lawn mowing machine is provided with an engine of an LPG fuel tank, and artificial-foot protection plates made of a noise elimination material are arranged on two sides of the middle of the mowing machine.

Description

technical field [0001] The present invention relates to a method for aerodynamic noise analysis aided by computer numerical simulation. The main improvement is a lawn mower which uses computer numerical simulation blade aerodynamic noise analysis. It is a lawn mowing engine with an LPG gas fuel tank. The front part of the lawn mower is equipped with a barb teeth grass feed rod; the middle part of the lawn mower is equipped with artificial foot protection plates with rotating hinges on both sides; Wheels are used; a muffler tank (including a muffler pipe and a water tank) is added; it is beneficial to grass feeding, counterweight, noise reduction, cooling, energy saving, environmental protection, moisture conservation and safety. Background technique [0002] Lawn mowers are widely used to mow grass in the manner chosen by people. When some pedestrians like and are used to using lawn mowers, they put a little more force on the rear upper armrest and have a feeling of leaning...

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Problems solved by technology

However, because the cutting knife is a thin steel plate that has been partially bent in a slender strip, due to tolerances, shape and position tolerances, and cumulative assembly errors, it is difficult to ensure that the tip of the knife at both ends is not high or low in a circle in a large number of actual production. On the plane; in case something happens is unavoidable, but it is also necessary to ensure that there is no safety problem in Wantai

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