Method for detecting the degree of soil compaction by agricultural tyres

Abstract

This invention relates to a method for detecting soil compaction using agricultural tires, addressing the problem of reducing the consequences of poor soil compaction and falling within the field of agricultural machinery testing. The method involves: laying a pressure-sensing film on the soil to be tested; pressing a tire onto the film at a set tilt angle; recording the pressure point locations and corresponding pressure values ​​in three regions on the film; and further calculating the total pressure P in each region. t Based on the influence of the roll angle on the pressure in different regions, the pressure weights w for the three regions are obtained. Ⅰ ,w Ⅱ ,w Ⅲ Calculate the total pressure P corresponding to the roll angle. D =P Ⅰ w Ⅰ +P Ⅱ w Ⅱ +P Ⅲ w Ⅲ ; to obtain different roll angles θ D The corresponding total pressure P D Calculate the total grounding pressure w D The roll angle is θ D Influence weights; based on P Z The total compaction degree C was calculated. This invention quantifies the influence mechanism of different tire camber angles on ground pressure distribution and soil compaction degree, providing a quantitative basis for optimizing tire width, tire pressure, and mechanical operating conditions.

Description

Technical Field

[0001] This invention relates to a method for detecting the degree of soil compaction by agricultural tires, belonging to the field of agricultural machinery testing. Background Technology

[0002] With the rapid development of agricultural mechanization, the soil compaction effect of tires has become a significant concern. When agricultural machinery operates in the field, the ground pressure from the tires can reduce soil porosity and permeability, thus affecting crop growth and the soil ecosystem. Furthermore, soil compaction increases farming costs and the uncertainty of crop yields. Traditional research has primarily focused on the impact of parameters such as tire load, width, and tire pressure on soil compaction. Summary of the Invention

[0003] To address the issue of how to reduce the consequences of poor soil compaction, this invention provides a method for detecting the degree of soil compaction using agricultural tires.

[0004] The present invention provides a method for detecting the soil compaction degree of agricultural tires, comprising:

[0005] S1. Lay a pressure sensing film on the soil to be tested, and press the tire on the pressure sensing film at a set tilt angle. Count the pressure point positions and corresponding pressure values ​​on the pressure sensing film.

[0006] S2. Divide the pressure-sensing membrane into three regions: left region I, middle region II, and right region III. Calculate the total pressure P in each region based on the pressure point distribution. t t = I, II, III;

[0007] S3. Based on the influence of the roll angle on the pressure in different regions, the pressure weights w for the three regions are obtained. Ⅰ ,w Ⅱ ,w Ⅲ Calculate the total pressure P corresponding to the roll angle. D =P Ⅰ w Ⅰ +P Ⅱ w Ⅱ +P Ⅲ w Ⅲ ;

[0008] S4. Following S1 to S3, obtain different roll angles θ. D The corresponding total pressure P D D = 1, 2, ..., n, where n represents the number of roll angles, depending on the different roll angles θ D The corresponding total pressure P D Calculate the total grounding pressure P Z , w D The roll angle is θD the influence weight of the total ground pressure P

[0009] S5, according to the total ground pressure P Z The total compaction degree C is calculated.

[0010] As preferred, in S2, the pressure sum P t is:

[0011]

[0012] wherein the pressure point position coordinates of the pressure sensing film region t are {(x1, y1), (x2, y2),..., (x m , y m )}, and the corresponding pressure value region is {P1, P2,..., P m};

[0013] m is the number of pressure points generated by the tire in the pressure sensing film region t;

[0014] The geometric center coordinates of the region t are (x c , y c );

[0015] σ represents the standard deviation.

[0016] As preferred, the three region pressure weights w Ⅰ , w Ⅱ , w Ⅲ are respectively:

[0017]

[0018] wherein the influence coefficient of the roll angle on the pressure distribution is

[0019] a0 and b0 are the major axis and the minor axis of the tire ground surface respectively when there is no roll;

[0020] W is the width of the tire;

[0021] D is the diameter of the tire.

[0022] As preferred, in S4, the influence weight w D of the roll angle θ D is:

[0023]

[0024] wherein ε is a small constant to prevent the denominator from being zero.

[0025] As preferred, the total compaction degree C is:

[0026]

[0027] wherein M is the load, M0 is the standard load;

[0028] P is the tire pressure, P0 is the standard tire pressure;

[0029] v is the speed, v0 is the standard speed.

[0030] The beneficial effects of the present application, the traditional research only focuses on the tire width, load and inflation pressure and other factors on the effect of soil compaction, ignoring the role of the important variable of the side angle. The present application quantifies the influence mechanism of different side angles (positive and negative angles) of the tire on the ground pressure distribution and soil compaction degree. The traditional research is difficult to capture the asymmetric ground pressure distribution caused by the change of the side angle, and the present application can collect the pressure distribution data in real time with high precision. For the change of the compaction depth caused by the side angle, a quantitative model is established, while the traditional method is mostly qualitative analysis. The present application provides a quantitative basis for optimizing the tire width, tire pressure and mechanical operating conditions. Application scenarios include soil protection operation of agricultural machinery under different terrain conditions, and load distribution optimization of engineering vehicles on special foundation. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a flowchart of the method of the present application;

[0032] Figure 2 is a schematic diagram of the area of the pressure sensing film;

[0033] Figure 3 is a schematic diagram of the major axis and the minor axis of the tire ground surface when there is no side angle. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0036] The present application will be further described below with reference to the drawings and specific embodiments, but not as a limitation of the present application.

[0037] Traditional studies have only focused on the effects of tire width, load, and inflation pressure on soil compaction, ignoring the role of the important variable of side inclination angle. By introducing a pressure-sensing film and a test bench, a set of ground pressure data for one of the three regions of the pressure-sensing film (e.g., the left region) is obtained by adjusting different tire side inclination angles, and then all the pressure data are weighted according to their different importance on the pressure-sensing film using a Gaussian model to obtain a regional total pressure. As shown in Figure 1 The detection method of the agricultural tire of the embodiment for the degree of soil compaction includes:

[0038] Step 1: The detection method of the embodiment is performed on a test bench, which includes a detection table and a tractor. A soil tank is arranged on the detection table, and the soil tank is paved with soil to be measured. A pressure-sensing film is laid on the soil to be measured, the side inclination angle of the tire is measured, the set side inclination angle is pressed on the pressure-sensing film, the tire of the tractor is controlled to walk on the soil tank, and the position of the pressure point on the pressure-sensing film and the corresponding pressure value are counted:

[0039] Step 2: The pressure-sensing film is divided into three regions, as shown in Figure 2 , which are a left region I, a middle region II, and a right region III:

[0040] Left region I: a low side region of the ground surface transverse distribution, the pressure is concentrated when the negative side inclination angle;

[0041] Middle region II: the center region of the ground surface, the ground pressure is usually uniform;

[0042] Right region III: a high side region of the ground surface transverse distribution, the pressure may increase when the positive side inclination angle;

[0043] The pressure sum P t of each region is calculated according to the pressure point distribution of each region, t = I, II, III:

[0044] A set of measurement data: {P1, P2,..., P m}, representing the ground pressure values at different positions in the left region of the pressure-sensing film, these data are discrete pressure points. The position corresponding to each pressure point: {(x1, y1), (x2, y2),..., (x m , y m )}, representing the spatial position of these pressure points on the pressure-sensing film (represented by transverse and longitudinal coordinates).

[0045] The pressure sum P t of each region is:

[0046]

[0047] Wherein, the horizontal and vertical coordinates of the pressure point position of the pressure sensing film region t are {(x1, y1), (x2, y2),..., (x m , m y m )} and the corresponding pressure value region is {P1, P2,..., P c};

[0048] m is the number of pressure points generated by the tire in the pressure sensing film region t; the horizontal and vertical coordinates of the geometric center of the region t are (x c , y c ); and σ represents the standard deviation. The horizontal and vertical coordinates of the geometric center of the region are (x c , y Ⅰ ), the importance of which is the highest, and the importance of the points farther from the center is lower. The parameter σ, which describes the degree of importance decay, is 0.98, indicating the degree of diffusion of the Gaussian model.

[0049] Step 3, according to the influence of the roll angle on the pressure of different regions, three region pressure weights w Ⅱ , w Ⅲ , w D are obtained, and the total pressure P Ⅰ corresponding to the roll angle is calculated as P Ⅰ = P Ⅱ w Ⅱ + P Ⅲ w Ⅲ .

[0050] The three region pressure weights w Ⅰ , w Ⅱ , w Ⅲ are respectively:

[0051]

[0052] w Ⅱ = 1- |k·θ D |

[0053]

[0054] Wherein, θ D is the roll angle of the tire (unit: °), when the tire is rolled, θ D is positive, indicating that the vehicle body is inclined to the right, and θ D is negative, indicating that the vehicle body is inclined to the left.

[0055] The influence coefficient k of the roll angle on the pressure distribution is obtained by the following formula:

[0056]

[0057] a0 and b0 are the long and short half axes of the tire ground surface when there is no roll.

[0058] W is the width of the tire; D is the diameter of the tire.

[0059] Step 4, according to steps 1 to 3, different roll angles θ D The corresponding total pressure P D , D = 1, 2, …, n, n represents the number of roll angles, the smaller the roll angle, the greater the contribution, and the roll angle θ D The influence weight w D is

[0060]

[0061] ε is a small constant to prevent the denominator from being zero, taking 0.01.

[0062] According to different roll angles θ D The corresponding total pressure P D The total ground pressure P Z The integrated total ground pressure formula:

[0063]

[0064] Step 5, according to the total ground pressure P Z The total compaction C is calculated:

[0065]

[0066] Where M is the load, M0 is the standard load;

[0067] For small tractor tires: 5,000-10.000N, M0 take 7500N;

[0068] For medium-sized tractor tires: 10,000-30,000N, M0 take 20000N;

[0069] For large tractor tires: 30,000-60,000N, M0 = 45000N;

[0070] P is the tire pressure, P0 is the standard tire pressure;

[0071] v is the speed, v0 is the standard speed, the field operation reference value is 1m / s.

[0072] The present embodiment evaluates the influence of the tire on soil compaction under different roll angles and parameters such as tire pressure and driving speed through experimental equipment and data analysis means. The ground pressure cloud map is obtained by using the pressure sensing film, and the soil compaction degree is predicted by combining mathematical modeling, so as to optimize the tire design and mechanical operation parameters.

[0073] This embodiment is based on the detection method of pressure sensing film and gantry. By high-resolution pressure sensing film, real-time acquisition of tire ground pressure distribution data is realized, and combined with mathematical modeling and experimental verification, a set of compaction detection model is constructed. In the field of agriculture, this model can guide the adjustment of tire roll angle, load distribution and operation mode optimization, realize light compaction and high efficiency operation, and reduce the damage of deep plowing and other inefficient repair methods to soil structure. In the field of engineering, the model can also be used for construction foundation protection design to reduce the risk of settlement and instability. In the future, this technology is expected to be applied in many fields such as agriculture, engineering and environmental protection, providing scientific support for green development and intelligent operation.

[0074] While the application has been described with reference to particular embodiments, it will be understood that the examples are merely there to illustrate the principles and applications of the present application. It will be understood that numerous modifications can be made to the illustrative examples, and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It will be understood that the features described in connection with one embodiment can be used in conjunction with other embodiments described herein.

Claims

1. A method for detecting the degree of soil compaction by agricultural tires, characterized in that, The method includes: S1. Lay a pressure sensing film on the soil to be tested, and press the tire on the pressure sensing film at a set tilt angle. Count the pressure point positions and corresponding pressure values ​​on the pressure sensing film. S2. Divide the pressure-sensing membrane into three regions: left region I, middle region II, and right region III. Calculate the total pressure P in each region based on the pressure point distribution. t t = I, II, III; S3. Based on the influence of the roll angle on the pressure in different regions, the pressure weights w for the three regions are obtained. Ⅰ ,w Ⅱ ,w Ⅲ Calculate the total pressure P corresponding to the roll angle. D =P Ⅰ w Ⅰ +P Ⅱ w Ⅱ +P Ⅲ w Ⅲ ; Three regional pressure weights w Ⅰ ,w Ⅱ ,w Ⅲ They are respectively: Among them, the influence coefficient of the roll angle on the pressure distribution a0 and b0 are the long and short half-axles of the tire contacting the ground when there is no roll, respectively. W is the width of the tire; D is the diameter of the tire; S4. Following S1 to S3, obtain different roll angles θ. D The corresponding total pressure P D D = 1, 2, ..., n, where n represents the number of roll angles, depending on the different roll angles θ D The corresponding total pressure P D Calculate the total grounding pressure P Z , w D The roll angle is θ D Influence weight; Side roll angle θ D Influence weight w D for: Where ε is a small constant to prevent the denominator from being zero; S5, based on the total grounding pressure P Z Calculate the total compaction degree C; The total compaction degree C is: Where M is the load and M0 is the standard load; P is the tire pressure, and P0 is the standard tire pressure; v represents velocity, and v0 represents standard velocity.

2. The method for detecting the degree of soil compaction by agricultural tires according to claim 1, characterized in that, In S2, the total pressure P in each region t for: The coordinates of the pressure point in the pressure sensing membrane region t are {(x1,y1),(x2,y2),...,(x m ,y m )}, corresponding to the pressure value range {P1, P2, ..., P} m }; m represents the number of pressure points generated by the tire within the pressure sensing membrane region t. The geometric center coordinates of region t are (x c y c ); σ represents the standard deviation.

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