Contour Estimation Of Jet Noise In The Fly Over

With the continuous advance and development of the construction of "global integration",the demand for exchanges among countries is increasing.Not only in the flow of people,but also the flow of goods.Civil aviation transport has been greatly developed because of its unique convenience.Airlines in various countries are constantly expanding their fleet size,and countries are also constantly building or expanding new airports to adapt to the rapid development of civil aviation transport.China’s vast territory,the civil aviation transport industry has a great development space.With the development of China from a civil aviation power to a civil aviation power,the home-made "big plane" is about to be put into the market,and its "heart"-large bypass ratio turbofan engine is also in the research and development stage.However,with the development of the civil aviation industry,aircraft noise also receives continuous attention.The international civil aviation organization has very strict requirements on aircraft noise,and its requirements are getting stricter.The problem of aircraft noise is not only related to the airworthiness of large domestic aircraft,but also affects the physical and mental health of the residents in the surrounding communities.At present,the noise airworthiness work efficiency is relatively low and time-consuming.In the take-off and climb phase of civil aircraft,jet noise accounted for the largest proportion of the engine noise.There are clear requirements on noise airworthiness in the process of aircraft airworthiness certification.The development and manufacture of civil aviation turbofan engines not only need to consider the requirements of noise airworthiness,but also need to consider the impact of noise on the communities around the airport during takeoff.Based on the dynamic prediction of jet noise and the mapping of its contour line on the ground,we can not only master the airworthiness of the engine noise in advance,but also understand the impact of jet noise on the communities around the airport.In this paper,NASA’s STONE model is used to calculate the effective sensory noise level,which is a representation value of dynamic noise,in combination with the noise assessment criteria of aircraft airworthiness assessment criteria given in airworthiness assessment.Develop MATLAB program,calculate and visualize the results,complete the dynamic noise prediction for specific models and draw the dynamic noise contour.