A method for evaluating damage of a military truck target multi-component multi-level

Abstract

This invention provides a multi-component, multi-level damage evaluation method for military truck targets, comprising: Step 1, determining the overall dimensions and performance parameters of the military truck target; Step 2, establishing a simplified equivalent model of the military truck target; Step 3, calculating the component damage states of the military truck target; Step 4, calculating the functional system damage results of the military truck target; and Step 5, calculating the overall damage level of the military truck target. Based on the damage characteristics of military truck targets under explosive loads, this invention selects scientific and reasonable evaluation indicators to comprehensively evaluate vehicle targets under aerial bomb impact. Compared to a single decision-making scheme that evaluates the vehicle as a whole solely based on shock waves or fragments, the method provided by this invention can combine the damage states of each component and the interrelationships between component damage states to reasonably and scientifically evaluate the damage state of the target.

Description

Technical Field

[0001] This invention belongs to the technical field of explosion shock wave damage effect evaluation, and relates to military trucks, specifically to a multi-component, multi-level damage evaluation method for military truck targets. Background Technology

[0002] Military transport vehicles are at risk of being attacked by aerial munitions launched by fighter jets during logistical support and material delivery. The shock waves and fragments generated by the explosions of various munitions seriously threaten the survival of the transport vehicles and affect the effectiveness of military material transport operations.

[0003] Currently, damage assessment of military truck targets focuses primarily on the tangible damage to personnel and vehicles caused by blast fragments from ammunition explosions, neglecting the structural-functional-damage correlation chain between the target's various components. Since the impact of each sub-functional system on the overall function of the truck target varies, a secondary classification of functional damage is needed based on the impact of each sub-functional system on the truck's function. Therefore, establishing a comprehensive damage assessment method that considers multiple components and multiple levels of damage to military truck targets is of great significance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a multi-component, multi-level damage assessment method for military truck targets, thereby solving the technical problem that existing assessment methods neglect the structural-functional-damage correlation chain between various components of military truck targets, leading to incomplete damage assessment.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A method for evaluating multi-component, multi-level damage to military truck targets, comprising the following steps:

[0007] Step 1: Determine the overall dimensions and performance parameters of the military truck target;

[0008] Step 2: Establish a simplified equivalent model of the military truck target;

[0009] Step 3: Calculate the damage status of the military truck target's components;

[0010] Step 4: Calculate the damage results to the functional systems of the military truck target;

[0011] Step 5: Calculate the overall damage level of the military truck target.

[0012] Compared with the prior art, the present invention has the following technical effects.

[0013] (I) Based on the damage characteristics of military truck targets under explosive loads, this invention selects scientific and reasonable evaluation indicators (i.e., shock wave damage indicators and damage level indicators of each component) to comprehensively evaluate vehicle targets under bomb impact. Compared with the single decision-making scheme that evaluates the vehicle as a whole based solely on shock waves or fragments, the method provided by this invention can combine the damage status of each component and the interrelationship between the damage status of components to reasonably and scientifically evaluate the damage status of the target.

[0014] (II) This invention uses the damage tree method to reasonably allocate the weights of each evaluation index in combination with the actual situation. Combined with the empirical model and the target data in the actual test, it greatly eliminates the subjective factors when setting the weights. It objectively reflects the correlation between the training and the vehicle target in actual combat through the weights. At the same time, it effectively evaluates the degree of damage to each component and each function, which is more conducive to the formulation of decision-making schemes.

[0015] (III) This invention realizes a comprehensive evaluation of the damage level of military truck targets under multiple factors. It uses the associated damage tree algorithm to solve the model. The principle is simple and has good convergence.

[0016] (IV) The method for evaluating the damage of multiple components and levels of military truck targets under the impact of air munitions provided by this invention can objectively reflect the correlation between vehicle targets in training and actual combat through weighted reflection, and at the same time effectively evaluate the degree of damage to each component and each function.

[0017] (V) This invention provides a method for evaluating the multi-component, multi-level damage of military truck targets under the impact of air munitions using a damage tree algorithm. It has a wide range of applications, simple principles, is easy to use, and has good reliability. Attached Figure Description

[0018] Figure 1 This is a simplified equivalent model diagram of a military truck.

[0019] Figure 2 A schematic diagram of the multi-component, multi-level damage correlation tree for military truck targets.

[0020] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, all devices and components in this invention are devices and components known in the prior art.

[0022] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0023] Example:

[0024] This embodiment provides a method for evaluating multi-component, multi-level damage to military truck targets. The method includes the following steps:

[0025] Step 1: Determine the overall dimensions and performance parameters of the military truck target:

[0026] Based on a typical unarmored transport truck, the overall size and performance parameters of the military truck target were measured and determined. The overall structure of the military truck target was described using the overall size and performance parameters, and a basic parameter table of the military truck target was formed, as shown in Table 1.

[0027] The overall dimensions and performance parameters mentioned include the truck's overall length T. L,i The truck's overall width is T W,i Carriage height T H,i Total mass m t,i Rated load capacity (m) r,i Maximum speed v max,i wheelbase d s,i wheel spacing d w,i .

[0028] Table 1 Basic Parameters of Military Truck Targets

[0029]

[0030] Step two, establish a simplified equivalent model of the military truck target:

[0031] In this step, the simplified equivalent model of the military truck target is mainly described using the performance parameters of the truck target, ignoring the complex structure of the vehicle in the actual state, and simplifying the military truck target into a combination of seven parts.

[0032] The military truck target is divided into seven major components. These seven components are then simplified into equivalent geometric shapes to form a simplified model. Based on the simplified model and the basic parameters obtained in step one from the basic parameter table of the military truck target, the parameter table of the simplified equivalent model of the military truck target is determined, as shown in Table 2. Finally, the simplified equivalent model of the military truck target is established. Figure 1 As shown.

[0033] The seven major components include the engine, chassis, cargo box, cab, fuel tank, wheels, and electrical equipment.

[0034] The geometric shapes include cylinders, prisms, ellipsoids, and cuboids.

[0035] In the simplified equivalent model of the military truck target, the center point coordinates of the military truck target are (x... i ,yi ,z i The military truck target has dimensions L, W, and H in the length, width, and height directions, respectively. The coordinates of the boundary points of the seven major components are determined by the center point coordinates and the dimensions in the length, width, and height directions of the military truck target. For example, if the cab has a rectangular geometry, then the coordinates of its six boundary points are (x, y ... i ±L,y i ±W,z i ±H).

[0036] Table 2. Parameters of the simplified equivalent model of military truck targets.

[0037]

[0038] Step 3: Calculate the component damage status of the military truck target:

[0039] In this step, the damage status of the seven major components from step two is calculated using a combined shock wave and fragmentation damage model. Analyzing the vulnerability of trucks requires first analyzing the target's damage patterns, identifying the target's basic damage events, establishing the relationship between structural and functional damage to the military truck target based on these events, and classifying the target's damage level.

[0040] Step 301, based on the boundary point coordinates (x i ±L,y i ±W,z i ±H), the boundary point region is discretized into n×n discrete points, where n represents the number of discrete points, and the peak incident pressure of the shock wave overpressure in the region composed of the boundary points is calculated according to the Sadovsky formula.

[0041] The Sadovsky formula is expressed as follows:

[0042]

[0043]

[0044] In the formula:

[0045] ΔP m This represents the peak incident pressure of the shock wave overpressure.

[0046] m indicates that the explosive charge explosion is in an infinite space;

[0047] Indicates proportional distance;

[0048] R represents the actual distance from the epicenter;

[0049] W indicates the amount of propellant in the ammunition.

[0050] Based on the relationship between the overpressure and baropressure action time of shock waves in typical air-to-ground munitions, the baropressure action time τ is calculated. + :

[0051]

[0052] The curve of the shock wave incident pressure Δp(t) versus time passes through the peak value of the shock wave overpressure incident pressure Δp. m The reverse calculation yields:

[0053]

[0054] In the formula:

[0055] t represents time;

[0056] 'a' represents the incident pressure coefficient of the shock wave.

[0057] When 1 atmosphere < Δp m When the pressure is less than 3 atmospheres, the incident pressure coefficient 'a' of the shock wave is expressed as:

[0058]

[0059] Based on this, the impulse I of the shock wave overpressure can be calculated.

[0060] Step 302: Calculate the overall damage level of each component of the military truck target based on the shock wave impulse damage criterion.

[0061]

[0062] In the formula:

[0063] p(b1) represents the shock wave impulse damage criterion;

[0064] b1 indicates the component damage event number of the chassis and axle;

[0065] I represents the impulse of the shock wave overpressure;

[0066] I i cr1 This represents the lower limit threshold of the damage impulse for the i-th component;

[0067] I i cr2 This represents the upper limit threshold of the damage impulse for the i-th component.

[0068] In this step, the upper and lower limits of the impulse thresholds for each component of the military truck target are shown in Table 3:

[0069] Table 3. Upper and lower limits of impulse thresholds for various components of military truck targets.

[0070]

[0071] Step 4: Calculate the damage results to the functional systems of the military truck target:

[0072] The damage to different components can be calculated based on the three steps described above. The correlation between the damage to the components can yield corresponding damage events, which can further reflect the functional damage to the military truck target. Detailed information on damage event numbers under different damage categories is shown in Table 4 below.

[0073] Table 4 Damage event numbers under different damage categories

[0074]

[0075] Since the impact of each sub-functional system on the overall function of the truck target varies, the damage to the functional system of the military truck target is defined into four types according to the degree of impact of each sub-functional system on the truck's function: damage to the support function, damage to the motion function, damage to the carrying function, and damage to the auxiliary function.

[0076] When calculating the damage to the functional system, the 0-1 method is used to determine the component's disability status. The disability status is 1 when the damage probability reaches 100%, and 0 under other conditions.

[0077] like Figure 2 As shown, all the mapping relationships from component damage to functional damage are "OR" mapping relationships, specifically:

[0078] (1) Class I functional damage: This refers to the truck losing its supporting function, manifested as damage to the frame and axles, disintegration of the cab, fuel tank combustion, or disintegration of the supporting structure, making the vehicle irreparable. Severe plastic deformation occurs in the frame or axles of the chassis structure, causing the components to lose their interconnections and completely disintegrate. Severe plastic deformation occurs in the cab shell, causing the components to separate, resulting in the cab disintegrating and losing its supporting function; its carrying and movement functions are also completely lost. Combustion or explosion of the fuel tank or flammable and explosive materials carried will also cause the truck to completely lose its carrying and movement functions, and damage its supporting function.

[0079] (2) Class II functional damage: This refers to damage to the truck's motion function, manifested as damage to the engine, chassis, or fuel tank. Engine damage results in the inability to start or run normally, or insufficient power. Damage to the chassis transmission, steering, braking, or wheels prevents the engine power from being transmitted to the wheels, ultimately causing the vehicle to remain stationary or move slowly. Wheel damage also leads to loss of motion function. The truck in this article can be divided into four wheels: front, rear, left, and right. Damage to each wheel will affect the vehicle's maneuverability.

[0080] (3) Class III Functional Damage: Class III functional damage refers to damage to the truck's carrying function, mainly manifested as damage to the cargo box or the driver's cab. Vehicles carry personnel and goods through the cargo box and driver's cab to achieve their carrying function. The cargo box walls and floor have a large area, making them very susceptible to deformation and disintegration under the impact of munition explosion shock waves during air-to-ground attacks. This can cause damage to the personnel and materials being carried, affecting the truck's carrying capacity.

[0081] (4) Class IV functional damage: refers to damage to the auxiliary functions of the truck, mainly manifested as damage to electrical equipment and vehicle body accessories. Damage to the truck's battery, motor, electrical wiring or instruments will affect the control of the vehicle's starting and driving functions, reducing the vehicle's driving performance and power performance.

[0082] Step 5: Calculate the overall damage level of the military truck target:

[0083] Since the impact of each basic damage event on the vehicle's functional systems and on the vehicle's target functions varies, the basis and standards for classifying the vehicle's target damage level are determined by referring to the general classification method for vehicle target damage levels, based on the degree of impact of each damage event and functional system on the vehicle's functions.

[0084] Calculate the overall damage level of the military truck target based on the functional system damage results obtained in step four.

[0085] The overall damage level of military truck targets is classified into four levels: destroyed, severely damaged, moderately damaged, and slightly damaged or intact.

[0086] (1) Destruction: refers to a Class I damage event that occurs to a military truck target, such as large deformation, disintegration or fuel tank burning, basically losing its support capacity, and the probability of the whole vehicle being destroyed is ≥85%.

[0087] (2) Severe damage: refers to a Class II, III or IV functional damage event that occurs, in which the vehicle loses most of its mobility or carrying capacity, and the probability of the whole vehicle being damaged is between 15% and 50%.

[0088] (3) Moderate damage: refers to the loss of some of the vehicle's motion or carrying functions, with the probability of the entire vehicle being damaged between 50% and 85%.

[0089] (4) Minor damage or intact: refers to a Class IV functional damage event that has occurred to the vehicle, where the basic auxiliary system functions of the vehicle are damaged and the probability of damage to the whole vehicle is ≤15%.

[0090] Application example:

[0091] This application example presents a multi-component, multi-level damage assessment method for military truck targets based on the above embodiments.

[0092] Step 1: Determine the overall dimensions and performance parameters of the military truck target:

[0093] The basic parameters of the military truck target are shown in Table 5. The explosive charge of the aerial bomb is 90 kg, and the detonation point is located at the front of the vehicle (10 m, 8 m).

[0094] The overall structure of the truck is described by its overall dimensions and performance parameters, forming a basic parameter table for military truck targets.

[0095] Table 5 Basic Parameters of Military Truck Targets

[0096]

[0097] Step two, establish a simplified equivalent model of the military truck target:

[0098] Based on the simplified truck target model and the previously obtained dimensional parameters of each component, the parameter table of the truck target model is determined. The coordinates of the center point of the target are (x... i y i , z i The length, width, and height dimensions are (L, W, H), and the coordinates of the component boundary points can be determined based on these two parameters. Table 6 shows the parameter table for the simplified equivalent model of the military truck target.

[0099] Table 6. Parameters of the Simplified Equivalent Model of Military Truck Targets

[0100]

[0101]

[0102] Step 3: Calculate the component damage status of the military truck target:

[0103] The damage patterns of the target were analyzed by calculating the damage status of seven major components, including the engine, chassis, carriage, cab, fuel tank, wheels, and electrical equipment, using a combined shock wave and fragment damage model. The basic damage events of the target were then identified.

[0104] Step 301, Calculation of engine damage probability:

[0105] Based on the peak incident pressure Δp of the shock wave overpressure m =0.247MPa. Based on the relationship between the overpressure and barotropic action time of the shock wave in typical air-to-ground munitions, the barotropic action time τ is calculated. + :

[0106]

[0107] The incident pressure coefficient α of the shock wave can be expressed as:

[0108]

[0109] The equation for the change of the incident pressure Δp(t) of the shock wave with time is:

[0110]

[0111] Based on this, the impulse of the shock wave overpressure can be calculated. By comparing the upper and lower thresholds of the impulse for engine damage, it can be concluded that the probability of engine damage is 100%, and its failure state is 1.

[0112] Step 302, Calculation of the probability of damage to other components:

[0113] By analogy with the method for calculating the damage probability of a vehicle engine, the damage probability of each component of a military vehicle under specific projectile-target encounter conditions can be obtained. Table 7 lists the peak overpressure of the shock wave, the duration of positive pressure, the impulse value, the damage probability, and the damage and incapacity state of each component.

[0114] Table 7. Probability of Damage and Disability Status of Various Components of Military Transport Vehicles

[0115]

[0116] Step 4: Calculate the damage results to the functional systems of the military truck target:

[0117] By comparing the definitions of various types of functional damage with the component damage probability and component failure status in Table 7, it can be concluded that military trucks suffer Class II and Class III functional damage, namely, failure of motion function and carrying function.

[0118] Step 5: Calculate the overall damage level of the military truck target:

[0119] Based on the damage probabilities of each component listed in Table 7, and combined with the damage weight of each component relative to the whole, the overall damage probability of the vehicle target can be calculated, and the damage level of the vehicle target can be qualitatively analyzed through the damage probability results.

[0120] The overall probability of vehicle damage is:

[0121] P total = 100% * 0.20 + 74% * 0.25 + 100% * 0.1 + 100% * 0.15 + 100% * 0.1 +

[0122] 56% * 0.1 + 62% * 0.1 = 85.3% ≥ 85%.

[0123] Based on the overall damage assessment criteria for vehicles, if the probability of vehicle damage exceeds 85%, the damage level of the aerial bomb to the vehicle under the specified encounter conditions is considered to be severe.

Claims

1. A method for evaluating multi-component, multi-level damage to military truck targets, characterized in that, The method includes the following steps: Step 1: Determine the overall dimensions and performance parameters of the military truck target: The overall size and performance parameters of the military truck target are measured and determined. The overall structure of the military truck target is described based on the overall size and performance parameters, and a basic parameter table of the military truck target is formed. Step two, establish a simplified equivalent model of the military truck target: The military truck target is divided into multiple components. Each component is simplified into an equivalent geometric shape to form a simplified model. Based on the simplified model and the basic parameters in the basic parameter table of the military truck target obtained in step one, the parameter table of the simplified equivalent model of the military truck target is determined, and finally the simplified equivalent model of the military truck target is established. In the simplified equivalent model of the military truck target, the center point coordinates of the military truck target are (x... i ,y i ,z i The dimensions of the military truck target in the length, width, and height directions are L, W, and H, respectively. The coordinates of the boundary points of the multiple components are determined by the coordinates of the center point of the military truck target and its dimensions in the length, width, and height directions. Step 3: Calculate the component damage status of the military truck target: Step 301, based on the boundary point coordinates (x i ±L,y i ±W,z i ±H), the boundary point region is discretized into n×n discrete points, where n represents the number of discrete points, and the peak incident pressure of the shock wave overpressure in the region composed of the boundary points is calculated according to the Sadovsky formula. The Sadovsky formula is expressed as follows: In the formula: ΔP m This represents the peak incident pressure of the shock wave overpressure. m indicates that the explosive charge explosion is in an infinite space; Indicates proportional distance; R represents the actual distance from the epicenter; W indicates the propellant charge; Based on the relationship between the overpressure and baropressure action time of shock waves in typical air-to-ground munitions, the baropressure action time τ is calculated. + : The curve of the shock wave incident pressure Δp(t) versus time passes through the peak value of the shock wave overpressure incident pressure Δp. m The reverse calculation yields: In the formula: t represents time; 'a' represents the incident pressure coefficient of the shock wave; When 1 atmosphere < Δp m When the pressure is less than 3 atmospheres, the incident pressure coefficient 'a' of the shock wave is expressed as: Based on this, the impulse I of the shock wave overpressure can be calculated. Step 302: Calculate the overall damage level of each component of the military truck target based on the shock wave impulse damage criterion. In the formula: p(b1) represents the shock wave impulse damage criterion; b1 indicates the component damage event number of the chassis and axle; I represents the impulse of the shock wave overpressure; I i cr1 This represents the lower limit threshold of the damage impulse for the i-th component; I i cr2 This represents the upper limit threshold of the damage impulse for the i-th component.

2. The method for evaluating multi-component, multi-level damage to military truck targets as described in claim 1, characterized in that, In step one, the overall dimensions and performance parameters include the overall length T of the truck. L,i The truck's overall width is T W,i Carriage height T H,i Total mass m t,i Rated load capacity (m) r,i Maximum speed v max,i wheelbase d s,i wheel spacing d w,i .

3. The method for evaluating multi-component, multi-level damage to military truck targets as described in claim 1, characterized in that, In step two, the multiple components include the engine, chassis, carriage, cab, fuel tank, wheels, and electrical equipment.

4. The method for evaluating multi-component, multi-level damage to military truck targets as described in claim 1, characterized in that, In step two, the geometric shapes include cylinders, prisms, ellipsoids, and cuboids.

5. The method for evaluating multi-component, multi-level damage to military truck targets as described in claim 1, characterized in that, It also includes step four; Step 4: Calculate the damage results to the functional systems of the military truck target: Damage to the functional systems of military truck targets is defined in four types: damage to support functions, damage to motion functions, damage to carrying functions, and damage to auxiliary functions. When calculating the damage to the functional system, the 0-1 method is used to determine the component's disability status. The disability status is 1 when the damage probability reaches 100%, and 0 under other conditions.

6. The method for evaluating multi-component, multi-level damage to military truck targets as described in claim 5, characterized in that, All component damage to functional damage mapping relationships are either 0 or 1.

7. The method for evaluating multi-component, multi-level damage to military truck targets as described in claim 5, characterized in that, It also includes step five; Step 5: Calculate the overall damage level of the military truck target: Calculate the overall damage level of the military truck target based on the functional system damage results obtained in step four. The overall damage level of military truck targets is classified into four levels: destroyed, severely damaged, moderately damaged, and slightly damaged or intact.

Images