Design method and system of low-noise wind tunnel
A design method and low-noise technology, applied in the field of wind tunnel experiments, can solve problems such as difficulty in designing a low-noise wind tunnel, and achieve the effects of adjustable noise reduction process, simple process and noise reduction.
Active Publication Date: 2022-08-02
NAT UNIV OF DEFENSE TECH
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005]
The invention provides a design method and system for a low-noise wind tunnel to solve the technical problem that it is difficult to design a low-noise wind tunnel in the existing wind tunnel noise reduction method
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0050] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered below.
[0051] like figure 1 As shown, the preferred embodiment of the present invention provides a design method for a low-noise wind tunnel, including the following contents:
[0052] Step S1: acquiring the noise signal generated by the acoustic radiation disturbance wave in the incoming flow of the wind tunnel;
[0053] Step S2: Judge whether the incoming flow from the wind tunnel meets the low noise condition based on the energy spectrum distribution of the noise signal. If not, generate anti-phase sound waves with a phase difference of 180° and the same propagation direction, frequency and amplitude in the wind tunnel according to the noise signal , to cancel out the acoustic radiation disturbance wave.
[0054] It can be understood that the design method...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method and system for designing a low-noise wind tunnel, and the method comprises the steps: firstly obtaining a noise signal generated by sound radiation disturbance waves in wind tunnel incoming flow, then judging whether the wind tunnel incoming flow meets a low-noise condition or not based on the energy spectrum distribution of the noise signal, and when the signal energy distribution of each frequency band of the noise signal is consistent, judging whether the wind tunnel incoming flow meets the low-noise condition or not; if yes, the low-noise condition is met, and if not, anti-phase sound waves with the phase difference of 180 degrees and the same propagation direction, frequency and amplitude are generated in the wind tunnel according to the noise signals, the anti-phase sound waves are used for counteracting sound radiation disturbance waves in the wind tunnel incoming flow, and therefore the noise of the wind tunnel incoming flow is reduced. According to the design method of the low-noise wind tunnel, compared with an existing mode that a porous material adsorbs sound waves, the noise reduction process is adjustable, the noise reduction requirements of the wind tunnel under different working conditions can be met, compared with an existing boundary layer suction mode, the process is simpler and easier to implement, and noise reduction transformation can be conducted on almost all wind tunnel equipment.
Description
technical field [0001] The invention relates to the technical field of wind tunnel experiments, in particular, to a design method and system of a low-noise wind tunnel. Background technique [0002] A wind tunnel is a kind of pipe-shaped experimental equipment that artificially generates and controls airflow, which is used to simulate the flow of gas around an aircraft or an entity, and to measure the effect of airflow on the entity and observe physical phenomena. One of the most common and effective tools for experimentation. In order to make the results of the wind tunnel experiment accurate, the free flow conditions provided by the wind tunnel must be completely consistent with the actual flight environment of the aircraft. However, usually, the wind tunnel laboratory cannot fully achieve this. One of the important The factor is that the airflow turbulence and noise level in the wind tunnel are larger than the real flight environment, so the energy spectrum distribution ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/02
CPCG01M9/02Y02T90/00
Inventor 刘小林易仕和
Owner NAT UNIV OF DEFENSE TECH