A damping shock-based cabin inner plate noise reduction structure

Abstract

This paper proposes a noise reduction structure for the cabin interior panel based on damping vibration reduction. The outer side of the cabin interior panel is connected to the outer layer mask. Ribs are provided between the outer layer mask and the cabin interior panel. The ribs include vertical ribs and horizontal reinforcing ribs. The vertical ribs are horizontally equidistantly arranged on the inner surface of the cabin interior panel. Damping grooves are provided on the surface of the vertical ribs. The damping grooves are horizontally equidistantly spaced from several vertical ribs on the surface of the vertical ribs. Guide edges are provided on the bottom and both sides of the damping grooves. By improving the original form of directly connecting the cabin interior panel to the ribs on the outer layer mask, damping sliders are set on the ribs. The damping sliders can effectively reduce the vibration radiation of the cabin interior panel, thereby reducing vibration noise inside the cabin. The sealed space between the outer layer mask and the cabin interior panel can also effectively isolate noise.

Description

Technical Field

[0001] This article belongs to the technical field of noise reduction for aircraft cabin interior panels, specifically involving a noise reduction structure for cabin interior panels based on damping and vibration reduction. Background Technology

[0002] In aircraft noise reduction design, sound absorption and sound insulation are two important aspects: 1. In sound absorption, the abundant pores and voids on the surface and inside of porous foam materials allow for the partial or complete absorption and dissipation of incident sound wave energy, achieving excellent sound absorption. In most applications, porous foam materials are lightweight and primarily used in mid- and high-frequency sound absorption designs. 2. In sound insulation, heavier damping materials are often used to reduce vibration and noise. These damping materials are polymers, exhibiting strong viscoelastic damping. Generally, sound insulation designs using damping materials can reduce structural vibration and improve noise reduction performance in the mid- and low-frequency ranges.

[0003] Most existing cabin interior panels are equipped with sound insulation and vibration damping pads for shock absorption and noise reduction. These pads are placed between the aircraft's outer panel and the cabin interior panel to achieve temperature insulation and noise reduction, and also reduce the transmission of vibrations from the aircraft's outer panel to the cabin interior panel.

[0004] However, low-frequency noise is generated during flight. Due to the strong penetrating power of low-frequency noise, the existing skin insulation layer, caster plate, and the air layer in between are difficult to effectively reduce or eliminate low-frequency noise, thus making it difficult to provide passengers with a comfortable flight environment. Summary of the Invention

[0005] To address the aforementioned issues, this paper proposes a noise reduction structure for the cabin interior panel based on damping vibration reduction. The outer side of the cabin interior panel is connected to an outer layer panel, and ribs are provided between the outer layer panel and the cabin interior panel. These ribs include vertical ribs and horizontal reinforcing ribs. The vertical ribs are horizontally equidistantly arranged on the inner surface of the cabin interior panel. Damping grooves are provided on the surface of the vertical ribs, with several vertical ribs horizontally equidistantly spaced on the surface of the damping grooves. Guide edges are provided on the bottom and both sides of the damping grooves, and damping sliders are embedded within these guide edges. The outer surface of the damping sliders is flush with the outer surface of the vertical ribs. The surface is flush with the damping slider, and a mounting protrusion is provided in the middle of the damping slider. The mounting protrusion is fixedly connected to the inner panel of the cabin. The side of the mounting protrusion is provided with transverse reinforcing ribs. By improving the original form of directly connecting the inner panel of the cabin to the ribs on the outer layer, the damping slider is set on the ribs and the inner panel of the cabin is connected and fixed to the damping slider. This makes the connection between the inner panel of the cabin and the outer layer a suspended connection. The damping slider can effectively reduce the vibration radiation of the inner panel of the cabin, thereby reducing vibration and noise inside the cabin. The sealing space between the outer layer and the inner panel of the cabin can also effectively isolate noise.

[0006] The vertical ribs are rectangular blocks, vertically positioned on the inner surface of the outer layer panel. A number of equally spaced vertical ribs have recessed damping grooves on their surfaces. By setting damping grooves on the vertical ribs, it is possible to eliminate the need for additional damper supports and other mechanisms, effectively reducing the added weight of the damping mechanism. Furthermore, placing dampers only on the vertical ribs ensures the longitudinal strength between the inner and outer layers of the cabin, thus limiting vibrations to a single axial direction and significantly reducing high-frequency noise.

[0007] The damping groove is a vertical strip-shaped groove. Guide edges are provided vertically through the bottom surface and the middle of both sides of the damping groove. The guide edges are rectangular convex edges with the same cross-sectional shape. A damping slider is provided inside the damping groove and engaged with the outside of the guide edge. The damping groove enables the damping slider to slide stably with damping, preventing abnormal deviation from affecting the interior. Furthermore, the polygonal guide edge inside the damping groove allows the damping slider to maintain high damping movement for a long time, thereby ensuring the overall strength of the damping slider.

[0008] The damping slider is a rectangular strip-shaped slider. The width of the damping slider is smaller than the width of the damping groove, and the length of the damping slider is smaller than the length of the damping groove. The bottom and both sides of the damping slider are provided with grooves. The inner side of the groove of the damping slider is provided with a damping spring. The vibration of the cabin inner panel is realized by the damping slider. The size of the damping slider is smaller than the damping groove, so that the outer panel can vibrate as a whole due to the air and engine during flight. The damping groove will also move up and down with high damping on the outside of the damping slider, thereby effectively reducing the high-frequency vibration of the outer panel.

[0009] The mounting protrusion is square and protrudes from the center of the damping slider. The outer side of the mounting protrusion is fixedly connected to the outer side of the cabin inner panel. The mounting protrusion is used to fix the cabin inner panel and reduce the contact area with the vertical ribs.

[0010] Beneficial effects:

[0011] The original method of directly connecting the inner cabin panel to the outer cover panel via ribs has been improved by installing damping sliders on the ribs and connecting and fixing the inner cabin panel to the damping sliders. This creates a suspended connection between the inner cabin panel and the outer cover panel. The damping sliders can effectively reduce the vibration radiation of the inner cabin panel, thereby reducing vibration and noise inside the cabin. The sealed space between the outer cover panel and the inner cabin panel can also effectively isolate noise.

[0012] By setting damping grooves on the vertical stiffeners, it is possible to reduce the weight of the damping mechanism without adding other unnecessary damper supports and other mechanisms. Furthermore, setting dampers only on the vertical stiffeners is to ensure the longitudinal strength between the inner panel and the outer panel of the overall cabin, thereby limiting the vibration to one axis and greatly reducing high-frequency noise.

[0013] The damping groove enables the damping slider to slide stably, preventing abnormal deviations from affecting the interior trim. Furthermore, the polygonal guide edge inside the damping groove allows the damping slider to maintain high damping for extended periods, thus ensuring the overall strength of the damping slider.

[0014] The vibration of the cabin interior panel is achieved by using a damping slider. The size of the damping slider is smaller than that of the damping groove, so that the outer panel can vibrate as a whole due to the air and engine during flight. The damping groove will also move up and down with high damping on the outside of the damping slider, thereby effectively reducing the high-frequency vibration of the outer panel.

[0015] Installing protrusions to fix the inner panels of the cabin reduces the contact area with the vertical ribs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a noise reduction structure for the cabin interior panel based on damping and vibration reduction.

[0017] Figure 2 This is a partial cross-sectional view of a noise reduction structure for the cabin interior panels based on damping and vibration reduction.

[0018] In the diagram: 1. Outer layer mask, 2. Vertical ribs, 3. Horizontal reinforcing ribs, 4. Damping slider. Detailed Implementation

[0019] To enhance understanding of the present invention, the invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only for explaining the invention and do not constitute a limitation on the scope of protection of the invention.

[0020] Outer layer cover 1, vertical ribs 2, horizontal reinforcing ribs 3, damping slider 4.

[0021] like Figure 1 , 2 As shown;

[0022] A noise reduction structure for an engine compartment interior panel based on damping vibration reduction is disclosed. The outer side of the engine compartment interior panel is connected to an outer layer panel 1. Ribs are provided between the outer layer panel 1 and the engine compartment interior panel. The ribs include vertical ribs 2 and horizontal reinforcing ribs 3. The vertical ribs 2 are horizontally equidistantly arranged on the inner surface of the engine compartment interior panel. Damping grooves are provided on the surface of the vertical ribs 2, with several vertical ribs 2 spaced horizontally at equal intervals. Guide edges are provided on the bottom and both sides of the damping grooves. Damping sliders 4 are embedded within the guide edges. The outer surface of the damping sliders 4 is flush with the outer surface of the vertical ribs 2. A mounting protrusion is provided in the middle of the damping sliders 4. The mounting protrusion is fixedly connected to the engine compartment interior panel. Horizontal reinforcing ribs 3 are provided on the side of the mounting protrusion. The vertical ribs 2 are rectangular blocks. The ribs 2 are vertically arranged on the inner surface of the outer layer panel 1. Several vertical ribs 2 are equidistantly spaced and have recessed damping grooves on their surfaces. The damping grooves are vertical strip-shaped grooves. The bottom surface and the middle of both sides of the damping groove are provided with guide edges that run vertically through the groove. The guide edges are rectangular convex edges with the same cross-sectional shape. The damping slider 4 is provided on the inner side of the damping groove and engaged with the outer side of the guide edge. The damping slider 4 is rectangular strip-shaped slider. The width of the damping slider 4 is less than the width of the damping groove, and the length of the damping slider 4 is less than the length of the damping groove. The bottom and both sides of the damping slider 4 are provided with sliding grooves. The inner side of the sliding groove of the damping slider 4 is provided with a damping spring. The mounting protrusion is square and protrudes from the center of the damping slider 4. The outer side of the mounting protrusion is fixedly connected to the outer side of the cabin inner panel.

[0023] Implementation example;

[0024] During flight or taxiing, the vibrations from the external air and the engine cause the cabin interior panels to vibrate randomly at high frequencies along with the outer panel 1, resulting in noise and vibration.

[0025] During the vibration process, the outer cover plate will vibrate vertically. The vibration of the outer cover plate 1 will cause the damping groove to move up and down on the outside of the damping slider 4. The damping slider 4 is relatively stationary relative to the vibration of the outer cover plate 1. Due to the high damping of the damping slider 4, the high frequency and high intensity vibration of the outer cover plate 1 can be isolated from the cabin inner panel by the damping of the damping slider 4. After the vibration is greatly reduced by the damping slider 4, the noise generated by the cabin inner panel can be greatly reduced.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A noise reduction structure for an engine compartment inner panel based on damping vibration reduction, wherein the outer side of the engine compartment inner panel is connected to an outer layer panel, and ribs are provided between the outer layer panel and the engine compartment inner panel, characterized in that, The ribs include vertical ribs and horizontal reinforcing ribs. The vertical ribs are arranged horizontally at equal intervals on the inner surface of the cabin inner panel. The surface of the vertical ribs is provided with damping grooves. The damping grooves are arranged horizontally at equal intervals between several vertical ribs on the surface of the vertical ribs. The bottom surface and both sides of the damping grooves are provided with guide edges. A damping slider is embedded in the guide edges. The outer surface of the damping slider is flush with the outer surface of the vertical rib. The middle of the damping slider is provided with a mounting protrusion. The mounting protrusion is fixedly connected to the cabin inner panel. The side of the mounting protrusion is provided with horizontal reinforcing ribs. The damping groove is a vertical strip groove. The bottom surface and the middle of both sides of the damping groove are provided with guide edges that run vertically through the groove. The guide edges are rectangular convex edges with the same cross-sectional shape. The damping slider is provided on the inner side of the damping groove and engaged with the outer side of the guide edge. The damping slider is a rectangular strip slider. The width of the damping slider is less than the width of the damping groove, and the length of the damping slider is less than the length of the damping groove. The bottom and both sides of the damping slider are provided with grooves, and a damping spring is provided inside the groove of the damping slider.

2. The cabin interior panel noise reduction structure based on damping vibration reduction according to claim 1, characterized in that, The vertical ribs are rectangular blocks, and are vertically arranged on the inner surface of the outer layer of the mask. Damping grooves are recessed on the surface of several vertical ribs at equal intervals.

3. The cabin interior panel noise reduction structure based on damping vibration reduction according to claim 1, characterized in that, The mounting protrusion is square in shape and protrudes from the center of the damping slider. The outer side of the mounting protrusion is fixedly connected to the outer side of the cabin inner panel.

Images