阅读说明：本技术 一种新型的汽车尾盖的安装和计算方法 (Novel automobile tail cover installation and calculation method ) 是由 达小华 刘维泉 于 2020-05-28 设计创作，主要内容包括：本发明属于汽车技术领域,尤其为一种新型的汽车尾盖的安装和计算方法,包括上尾盖,所述上尾盖的左端固定连接有尾翼,所述尾翼的底端固定连接下尾盖,所述上尾盖和下尾盖表面固定连接有海绵垫,所述海绵垫内开设有定型孔；本发明,通过设置尾翼能减少汽车在行驶过程中的根据尾翼的弧线角度能减少空气对车尾部的阻力,同时根据的空气动力学中的飞行马赫系数Ma,当马赫系数Ma≤0.3使为低速空气动力学和不可压缩的气体流动,进而使车尾的尾翼与空气的阻力至进行降低,便于减少汽车的行驶的阻力,设置海绵垫和定型孔能对箱汽车后备箱内的货物进行保护,同时也减少后备箱内的货物对上尾盖和下尾盖发生碰撞。(The invention belongs to the technical field of automobiles, and particularly relates to a novel automobile tail cover installation and calculation method which comprises an upper tail cover, wherein the left end of the upper tail cover is fixedly connected with an empennage, the bottom end of the empennage is fixedly connected with a lower tail cover, sponge pads are fixedly connected to the surfaces of the upper tail cover and the lower tail cover, and shaping holes are formed in the sponge pads; according to the invention, the tail wing is arranged, so that the resistance of air to the tail part of the automobile can be reduced according to the arc angle of the tail wing in the driving process of the automobile, meanwhile, according to the flight Mach coefficient Ma in the aerodynamics, when the Mach coefficient Ma is less than or equal to 0.3, the low-speed aerodynamics and the incompressible gas flow are realized, further, the resistance of the tail wing of the tail part of the automobile and the air is reduced, the driving resistance of the automobile is reduced conveniently, the sponge pad and the sizing hole are arranged, so that goods in the trunk of the automobile can be protected, and the collision of the goods in the trunk on the upper tail cover and the lower tail cover is reduced.)

1. The novel automobile tail cover mounting and calculating method comprises an upper tail cover (1) and is characterized in that: the left end fixedly connected with fin (2) of going up tail-hood (1), tail-hood (3) under the bottom fixed connection of fin (2), go up tail-hood (1) and tail-hood (3) fixed surface is connected with foam-rubber cushion (4) down, set type hole (5) have been seted up in foam-rubber cushion (4).

2. The novel automobile tail cover mounting and calculating method according to claim 1, wherein the calculating method comprises the following steps:

the method comprises the following steps: firstly, according to the state equation of the gas in the aerodynamics: p = P (ρ, T) and full gas equation of state; p/ρ = RT, (R = 287J/(kg.k) when R in the equation is a gas constant, the corresponding density is calculated under the same pressure P and temperature T in any state, and the corresponding material is selected;

step two: according to the total aerodynamic vector R and the total aerodynamic moment vector M;

R=∫_σ ^{（-pn+τ）dσ}

M=∫_σ ^{{rx（-pn+τ）}dσ}

in the formula, n is an out-of-object-plane normal unit vector; p is the static pressure of any point on the object plane; tau is the shear stress of any point of the object plane; r is the radius of the tail wing (2) to any point on the surface of the vehicle body, the aerodynamic force R and the moment M depend on the driving vehicle speed V, the shape of the tail wing (2), the attitude angle of the tail wing (2), the air density p, the temperature T, the gravity acceleration g, the time T and the like, and a corresponding total aerodynamic vector R and a corresponding total aerodynamic moment vector M are calculated;

step three: when the upper tail cover (1), the lower tail cover (3) and the tail wing (2) are produced, the tail wing (2), the upper tail cover (1) and the lower tail cover (3) with corresponding radians are designed by referring to a total aerodynamic vector R, a total aerodynamic moment vector M and the density of corresponding production materials, and then the materials are put into a production mold for production;

step four: and (3) installing and using the upper tail cover (1), the lower tail cover (3) and the tail wing (2) after production.

Technical Field

The invention belongs to the technical field of automobiles, and particularly relates to a novel automobile tail cover installation and calculation method.

Background

Automobile tail fin means on the car trunk lid, the rear end is adorned the protrusion of form duck tail, belong to a part in the car aerodynamic external member, the main function is in order to reduce the lift of vehicle afterbody, automobile tail fin and car tail lid are connected simultaneously, in current car tail lid and fin, can produce certain resistance to the car at the in-process of traveling, and then can cause certain influence to the speed of car at the in-process of traveling, when putting into certain article simultaneously in the trunk, the in-process that the car traveled, article can lead to the fact certain friction to the tail lid, it can cause the damage to the tail lid to go down for a long time, consequently propose a neotype car tail lid to above-mentioned problem.

Disclosure of Invention

To solve the problems set forth in the background art described above. The invention provides a novel method for installing and calculating an automobile tail cover, which has the characteristics of reducing the resistance of air to the driving of an automobile and protecting the memorability of goods in a trunk.

In order to achieve the purpose, the invention provides the following technical scheme: the novel automobile tail cover installation and calculation method comprises an upper tail cover, wherein the left end of the upper tail cover is fixedly connected with an empennage, the bottom end of the empennage is fixedly connected with a lower tail cover, the surfaces of the upper tail cover and the lower tail cover are fixedly connected with a spongy cushion, and shaping holes are formed in the spongy cushion.

Preferably, the calculation method comprises:

the method comprises the following steps: firstly, according to the state equation of the gas in the aerodynamics: p ═ P (ρ, T) and the complete gas equation of state; p/ρ -RT, (R-287J/(kg.k) when R is a gas constant in the equation, calculating the corresponding density at the same pressure P and temperature T in any state, and selecting the corresponding material;

step two: according to the total aerodynamic vector R and the total aerodynamic moment vector M;

R＝∫_σ ^(-pn+τ)dσ

M＝∫_σ ^{{rx(-pn+τ)}dσ}

in the formula, n is an out-of-object-plane normal unit vector; p is the static pressure of any point on the object plane; tau is the shear stress of any point of the object plane; r is the radius of the tail wing to any point on the surface of the vehicle body, the aerodynamic force R and the moment M depend on the running vehicle speed V, the shape of the tail wing, the attitude angle of the tail wing, the air density p, the temperature T, the gravity acceleration g, the time T and the like, and a corresponding total aerodynamic force vector R and a corresponding total aerodynamic moment vector M are calculated;

step three: when the upper tail cover, the lower tail cover and the tail wing are produced, the tail wing, the upper tail cover and the lower tail cover with corresponding radians are designed by referring to the total aerodynamic vector R, the total aerodynamic moment vector M and the density of corresponding production materials, and then the materials are put into a production mold for production;

step four: and installing and using the upper tail cover, the lower tail cover and the tail wing after production.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the tail wing is arranged, so that the resistance of air to the tail part of the automobile can be reduced according to the arc angle of the tail wing in the driving process of the automobile, and meanwhile, according to the flight Mach coefficient Ma in aerodynamics, when the Mach coefficient Ma is less than or equal to 0.3, the low-speed aerodynamics and the incompressible gas flow are realized, so that the resistance of the tail wing of the tail part of the automobile and the air is reduced, and the driving resistance of the automobile is reduced conveniently.

2. According to the automobile trunk, the upper tail cover and the lower tail cover are arranged, so that the automobile trunk can be integrally closed, the use of the upper tail cover and the lower tail cover of the automobile by a user is facilitated, the sponge cushion and the shaping hole are arranged, goods in the trunk can be protected, a certain fixing effect on the goods can be achieved, and the collision of the goods in the trunk on the upper tail cover and the lower tail cover is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic top view of the present invention;

in the figure: 1. a tail cover is arranged; 2. a tail wing; 3. a lower tail cover; 4. a sponge cushion; 5. and (4) shaping the hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.