Method and system for analyzing and testing compressive property of car roof

Abstract

The invention discloses a method and system for analyzing and testing the compression resistance of a car roof, and the method comprises the steps: firstly, detecting the pressure data and deformation borne by the car roof in real time, and arranging the pressure data into a pressure time sequence according to a time sequence; then, the pressure time sequence is divided into a plurality of data segments according to the time windows, and the average pressure change rate of each time window is calculated according to the pressure data in the corresponding data segments; and then according to the corresponding pressure data, the average pressure change rate and the time coupling coefficient, calculating space-time coupling resultant force at different moments. The space-time coupling resultant force comprehensively reflects the overall stress state of the car roof test point at different moments. And finally, in combination with the space-time coupling resultant force and deformation corresponding to different moments, the contact area of the loading device and the roof, the material correction coefficient and the deformation attenuation coefficient, calculating to obtain the corresponding real-time compressive strength of the roof at different moments, thereby realizing dynamic evaluation of the compressive strength of the roof.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle testing, in particular to a roof compression resistance performance analysis, testing method and system. BACKGROUND

[0002] The roof compression resistance performance test is an important test for evaluating the roof structure strength of a vehicle in a rollover accident. Mainly through the loading device to exert pressure on the roof, and real-time measurement of the deformation of the roof, and then combining the pressure exerted by the loading device and the deformation of the roof to determine the compression resistance of the roof. However, the existing test method can only display the pressure exerted by the loading device and the deformation of the roof in real time, and cannot dynamically evaluate the compression resistance of the roof at different deformation stages. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a roof compression resistance performance analysis, testing method and system, which can dynamically evaluate the compression resistance of the roof. The specific technical solutions are as follows: In a first aspect, a roof compression resistance performance analysis method is provided. In a first implementation of the first aspect, the method comprises: Real-time acquisition of pressure data and deformation of the roof exerted by the loading device during the test, and composition of a pressure time sequence according to all the acquired pressure data; Windowing the pressure time sequence according to a set time window, and calculating the average pressure change rate corresponding to each time window; According to the corresponding pressure data and average pressure change rate, the time-space coupling force corresponding to different time instants is calculated in combination with a set time coupling coefficient; Through the contact area of the loading device and the roof, and the time-space coupling force and deformation corresponding to different time instants, in combination with a set material correction coefficient and a deformation attenuation coefficient, the real-time compression resistance of the roof is dynamically evaluated.

[0004] In combination with the first implementation of the first aspect, in a second implementation of the first aspect, the pressure data exerted by the loading device on the roof is acquired, comprising: Acquiring three-directional force data measured by a three-axis force sensor provided on the loading device; According to the position angle between the three-axis force sensor and the loading device, the interference angle between different directional forces, and the environmental vibration acceleration and the set vibration correction coefficient, the three-directional force data is dynamically corrected; The pressure data is determined by the corrected three-directional force data.

[0005] In combination with the first implementation of the first aspect, in a third implementation of the first aspect, the time-space coupling force at different time instants is calculated, comprising: The time coupling coefficient is set according to the vehicle type corresponding to the roof.

[0006] In a second aspect, a roof pressure resistance performance analysis method is provided, and in a first implementable manner of the second aspect, the method comprises: Real-time pressure data applied by the loading device to the roof during the test is acquired, and all acquired pressure data is used to form a pressure time sequence; The pressure time sequence is divided into windows according to a set time window, and an average pressure change rate corresponding to each time window is calculated; According to the corresponding pressure data and the average pressure change rate, a time-space coupling resultant force corresponding to different time instants is calculated in combination with a set time coupling coefficient; The limit bearing capacity of the roof at the current time instant is predicted by using the time-space coupling resultant force corresponding to the current time instant and the time-space coupling resultant force corresponding to historical time instants.

[0007] In combination with the first implementable manner of the second aspect, in a second implementable manner of the second aspect, the limit bearing capacity of the roof is predicted, and the method comprises: The limit bearing capacity of the roof at the current time instant is predicted by using the time-space coupling resultant force corresponding to the current time instant and the time-space coupling resultant force corresponding to historical time instants, in combination with a set early warning delay time and a safety correction coefficient.

[0008] In a third aspect, a roof pressure resistance performance analysis method is provided, and the method comprises: Real-time pressure data and deformation applied by the loading device to the roof during the test are acquired, and all acquired pressure data is used to form a pressure time sequence; The pressure time sequence is divided into windows according to a set time window, and an average pressure change rate corresponding to each time window is calculated; According to the corresponding pressure data and the average pressure change rate, a time-space coupling resultant force corresponding to different time instants is calculated in combination with a set time coupling coefficient; Real-time compression strength of the roof is dynamically evaluated by using the contact area of the loading device and the roof, the time-space coupling resultant force and the deformation corresponding to different time instants, in combination with a set material correction coefficient and a deformation attenuation coefficient; The limit bearing capacity of the roof is predicted by using the time-space coupling resultant force corresponding to the current time instant and the time-space coupling resultant force corresponding to historical time instants.

[0009] In a fourth aspect, a roof pressure resistance performance test method is provided, and the method comprises: The roof pressure resistance performance analysis method in any one of the first to third implementable manners of the first aspect, the first to second implementable manners of the second aspect, and the third aspect is used to analyze the time-space coupling resultant force, the real-time compression strength and / or the limit bearing capacity of the roof at the current time instant. The spatiotemporal coupling force, the real-time compressive strength and / or the ultimate bearing capacity are compared with corresponding alarm thresholds, and whether to issue an alarm is determined according to a comparison result.

[0010] In a fifth aspect, a roof compressive performance analysis system is provided, comprising: A data acquisition module is configured to acquire, in real time, pressure data and deformation amount applied by the loading device to the roof during the test, and to form a pressure time sequence according to all acquired pressure data; A windowed calculation module is configured to window the pressure time sequence according to a set time window, and to calculate an average pressure change rate corresponding to each time window; A spatiotemporal coupling module is configured to calculate a spatiotemporal coupling force corresponding to different time instants according to corresponding pressure data and average pressure change rates, in combination with a set time coupling coefficient; A strength evaluation module is configured to dynamically evaluate a real-time compressive strength of the roof by a contact area of the loading device and the roof, and the spatiotemporal coupling force and deformation amount corresponding to different time instants, in combination with a set material correction coefficient and a deformation attenuation coefficient.

[0011] In a sixth aspect, a roof compressive performance analysis system is provided, comprising: A data acquisition module is configured to acquire, in real time, pressure data applied by the loading device to the roof during the test, and to form a pressure time sequence according to all acquired pressure data; A windowed calculation module is configured to window the pressure time sequence according to a set time window, and to calculate an average pressure change rate corresponding to each time window; A spatiotemporal coupling module is configured to calculate a spatiotemporal coupling force corresponding to different time instants according to corresponding pressure data and average pressure change rates, in combination with a set time coupling coefficient; A bearing prediction module is configured to predict an ultimate bearing capacity of the roof at a current time instant by the spatiotemporal coupling force corresponding to the current time instant, and the spatiotemporal coupling force corresponding to a historical time instant.

[0012] In a seventh aspect, a roof compressive performance analysis system is provided, comprising: A data acquisition module is configured to acquire, in real time, pressure data and deformation amount applied by the loading device to the roof during the test, and to form a pressure time sequence according to all acquired pressure data; A windowed calculation module is configured to window the pressure time sequence according to a set time window, and to calculate an average pressure change rate corresponding to each time window; A spatiotemporal coupling module is configured to calculate a spatiotemporal coupling force corresponding to different time instants according to corresponding pressure data and average pressure change rates, in combination with a set time coupling coefficient; The strength evaluation module is configured to dynamically evaluate the real-time compression strength of the roof by the contact area of the loading device with the roof, the space-time coupling force corresponding to different moments, and the deformation amount corresponding to different moments, in combination with a set material correction coefficient and a deformation attenuation coefficient. The bearing prediction module is configured to predict the ultimate bearing capacity of the roof by the space-time coupling force corresponding to the current moment and the space-time coupling force corresponding to historical moments.

[0013] In an eighth aspect, a roof compression performance testing system is provided, characterized in that it comprises: The analysis module is configured to analyze the space-time coupling force, the real-time compression strength, and / or the ultimate bearing capacity of the roof at the current moment by using the roof compression performance analysis method according to any one of the first to third implementation manners of the first aspect, the first to second implementation manners of the second aspect, and any one of the third aspect. The alarm module is configured to compare the space-time coupling force, the real-time compression strength, and / or the ultimate bearing capacity with corresponding alarm thresholds, and determine whether to issue an alarm according to the comparison result.

[0014] Advantages: By dividing the pressure time sequence obtained by testing into data segments, the average pressure change rate corresponding to different moments can be calculated using the roof compression performance analysis, testing method, and system. The average pressure change rate reflects the change trend of the pressure borne by the roof test point in the time period, and in combination with the pressure data corresponding to the corresponding moment and the set time coupling coefficient, the space-time coupling force of the roof test point corresponding to different moments can be calculated. The space-time coupling force comprehensively reflects the overall stress state of the roof test point at different moments, and in combination with the contact area of the loading device with the roof, the deformation amount of the test point at different moments, and the set material correction coefficient and deformation attenuation coefficient, the real-time compression strength of the roof can be dynamically evaluated, thereby realizing dynamic evaluation of the roof compression strength. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application, the drawings required for use in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0016] Figure 1 A flowchart of a roof compression performance analysis method provided by an embodiment of the present application; Figure 2 A flowchart of a roof compression performance analysis method provided by an embodiment of the present application; Figure 3 A flowchart of a roof compression performance analysis method provided by an embodiment of the present application; Figure 4A flowchart of a method for testing the roof crush resistance performance according to an embodiment of the present invention; Figure 5 This is a system block diagram of a vehicle roof crush resistance performance analysis system provided in an embodiment of the present invention; Figure 6 This is a system block diagram of a vehicle roof crush resistance performance analysis system provided in an embodiment of the present invention; Figure 7 This is a system block diagram of a vehicle roof crush resistance performance analysis system provided in an embodiment of the present invention; Figure 8 This is a system block diagram of a vehicle roof compression resistance testing system provided in an embodiment of the present invention. Detailed Implementation

[0017] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0018] Example 1 like Figure 1 The flowchart shown illustrates the roof crush resistance performance analysis method, which includes: Step 1: Acquire the pressure data and deformation amount applied to the roof by the loading device in real time during the test, and assemble a pressure time series based on all the acquired pressure data; Step 2: Divide the pressure time series into windows according to the set time windows, and calculate the average pressure change rate corresponding to each time window; Step 3: Calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient; Step 4: By measuring the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, and combining the set material correction coefficient and deformation attenuation coefficient, the real-time compressive strength of the roof is dynamically evaluated.

[0019] Specifically, firstly, the pressure applied to the roof by the loading device during the test, as well as the deformation of the roof under pressure, can be detected in real time using a detection device. This yields pressure data and deformation data of the roof at different times during the test, which are then arranged into a pressure time series. Next, the pressure time series can be divided into multiple data segments according to a set time window, and the average pressure change rate corresponding to each time window can be calculated based on all the pressure data contained in each segment.

[0020] The average pressure change rate reflects the changing trend of pressure experienced by the test point on the roof over a time period. Then, based on the corresponding pressure data and the average pressure change rate, combined with a set time coupling coefficient, the spatiotemporal coupling resultant force at different times can be calculated. The spatiotemporal coupling resultant force comprehensively reflects the overall stress state of the test point on the roof at different times. Finally, by combining the spatiotemporal coupling resultant force and deformation at different times, the contact area between the loading device and the roof, the material correction coefficient, and the deformation attenuation coefficient, the real-time compressive strength of the roof at different times can be calculated, thus achieving a dynamic assessment of the roof's compressive strength.

[0021] In this embodiment, optionally, acquiring pressure data applied to the roof by the loading device includes: Acquire triaxial force data measured by the triaxial force sensor installed on the loading device; The triaxial force data is dynamically corrected based on the position angle between the triaxial force sensor and the loading device, the interference angle between forces in different directions, the environmental vibration acceleration, and the set vibration correction coefficient. Pressure data is determined using the corrected triaxial force data.

[0022] Specifically, existing testing methods mostly only collect the uniaxial pressure value of the loading device when obtaining the pressure value applied to the roof by the loading device, and do not consider the mutual interference between multi-directional forces and the interference of environmental vibration, which results in a high error in the test results.

[0023] Therefore, this embodiment uses a triaxial force sensor to collect the pressure values ​​applied to the vehicle roof by the loading device in the X, Y, and Z axes, and simultaneously collects the environmental vibration acceleration using a vibration sensor. By combining the positional angle between the triaxial force sensor and the loading device, the interference angle between forces in different directions, the environmental vibration acceleration, and a set vibration correction coefficient, the pressure values ​​corresponding to the X, Y, and Z axes are dynamically corrected. These corrected pressure values ​​in the X, Y, and Z axes are then used as pressure data for subsequent dynamic evaluation. The specific calculation formula for the pressure value correction is as follows: ; in, For the first Pressure value after directional correction For the first Pressure value before directional correction For the triaxial force sensor in the first The angle between the mounting axis and the central axis of the loading device in the direction of the installation. For the triaxial force sensor The pressure in the direction and the first The interference angle between the pressure directions This is the vibration correction factor. This provides real-time environmental vibration acceleration. This eliminates the influence of factors such as sensor installation angle and environmental interference on force measurement, improving the accuracy of pressure data.

[0024] In this embodiment, optionally, calculating the spatiotemporal coupling resultant force at different times includes: The time coupling coefficient is set according to the vehicle type corresponding to the roof.

[0025] Specifically, after obtaining pressure data at different times during the test, the average pressure change rate corresponding to different time windows can be obtained by performing windowed calculations on the pressure time series constructed from the pressure data at different times. The average pressure change rate reflects the changing trend of the pressure experienced by the test point on the roof within a time period. The average pressure change rate corresponding to the previous time window can be used as the average pressure change rate corresponding to the time to be evaluated. Combined with the pressure data corresponding to the time to be evaluated and the set time coupling coefficient, the spatiotemporal coupling resultant force corresponding to the time to be evaluated can be calculated. The specific calculation formula is as follows: ; in, for The spatiotemporal coupling force corresponding to the moment, , , They are respectively The pressure values ​​corresponding to the X, Y, and Z axes after real-time correction. The time coupling coefficient is used because different vehicle types have different structural characteristics. Therefore, the time coupling coefficient can be set according to the vehicle type so that the calculated time coupling force is more in line with the actual situation of the vehicle being tested. for The average rate of change of pressure corresponding to the time window preceding the current moment. The average resultant force corresponding to the time window is calculated using the following formula: ; in, For the duration of the time window, Any time within the time window , and They are time points The corresponding dynamically adjusted loading device applies pressure values ​​to the roof in the X, Y, and Z axis directions.

[0026] Spatiotemporal coupling resultant force can comprehensively reflect the overall stress state of the test point at different times. Based on the spatiotemporal coupling resultant force at different times, corresponding mechanical change curves can be drawn so that testers can more clearly understand the change law of the roof under external force.

[0027] After calculating the spatiotemporal coupling resultant force, the real-time compressive strength of the roof at that moment can be calculated by combining the corresponding deformation. The specific calculation formula is as follows: ; in, for Real-time compressive strength at any given moment for The actual contact area between the loading device and the vehicle roof at any given time. This is a material correction factor. The deformation attenuation coefficient is... It is a constant. for The amount of deformation of the roof at any given moment.

[0028] In this way, the real-time compressive strength of the roof at different times can be calculated, thereby reflecting the roof's compressive strength during the test and realizing dynamic analysis of the roof's compressive performance.

[0029] Example 2 like Figure 2 The flowchart shown illustrates the roof crush resistance performance analysis method, which includes: Step S1: Acquire the pressure data applied to the roof by the loading device in real time during the test, and assemble a pressure time series based on all the acquired pressure data; Step S2: Divide the pressure time series into windows according to the set time windows, and calculate the average pressure change rate corresponding to each time window; Step S3: Calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient; Step S4: Predict the ultimate load-bearing capacity of the roof at the current moment by using the spatiotemporal coupling resultant force corresponding to the current moment and the spatiotemporal coupling resultant force corresponding to the historical moment.

[0030] Specifically, firstly, during the test, the pressure data borne by the roof can be monitored in real time using a detection device, and the pressure data at each moment is arranged into a pressure time series according to time sequence. Then, the pressure time series can be divided into multiple data segments according to a set time window, and the average pressure change rate corresponding to each time window can be calculated based on all the pressure data contained in the corresponding data segment. The average pressure change rate reflects the changing trend of the pressure borne by the roof test point within the time period. Next, based on the corresponding pressure data and the average pressure change rate, combined with a set time coupling coefficient, the spatiotemporal coupling resultant force corresponding to different moments can be calculated. The spatiotemporal coupling resultant force comprehensively reflects the overall stress state of the roof test point at different moments. Finally, based on the spatiotemporal coupling resultant force corresponding to the current moment, and using the spatiotemporal coupling resultant force corresponding to previous historical moments as a reference, the ultimate load-bearing capacity of the roof at the current moment can be predicted. The predicted ultimate load-bearing capacity can be used to determine whether there is a test risk at the current moment, and an alarm signal can be issued in a timely manner to ensure test safety.

[0031] In this embodiment, optionally, predicting the ultimate load-bearing capacity of the vehicle roof includes: Based on the spatiotemporal coupling force at the current moment and the spatiotemporal coupling force at historical moments, the ultimate load-bearing capacity of the vehicle roof at the current moment is predicted by combining the set warning delay time and safety correction coefficient.

[0032] Specifically, using the current moment as a baseline, the spatiotemporal coupling force corresponding to previous historical moments can be extracted from the calculated historical data according to a set historical time window. Since both prediction and alarm require processing time, to ensure the timeliness of the warning and improve the safety of the warning results, a warning delay time and a safety correction coefficient can be introduced when predicting the roof's ultimate load-bearing capacity. Combining the spatiotemporal coupling force corresponding to the current moment and historical moments, the current ultimate load-bearing capacity of the roof can be calculated. The specific calculation formula for the ultimate load-bearing capacity is as follows: ; in, For the current moment The corresponding ultimate bearing capacity, As a historical time window, The spatiotemporal coupling force corresponding to a historical moment. To delay the warning time, This is for safety factors. The ultimate load-bearing capacity determines the maximum force the roof can withstand. Comparing this ultimate load-bearing capacity with a pre-set threshold allows for assessment of whether a risk exists.

[0033] Example 3 like Figure 3The flowchart shown illustrates the roof crush resistance performance analysis method, which includes: Step D1: Acquire the pressure data and deformation amount applied to the roof by the loading device in real time during the test, and assemble a pressure time series based on all the acquired pressure data; Step D2: Divide the pressure time series into windows according to the set time windows, and calculate the average pressure change rate corresponding to each time window; Step D3: Calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient; Step D4: By measuring the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, and combining the set material correction coefficient and deformation attenuation coefficient, the real-time compressive strength of the roof is dynamically evaluated. Step D5: Predict the ultimate load-bearing capacity of the vehicle roof by using the spatiotemporal coupling resultant force at the current moment and the spatiotemporal coupling resultant force at historical moments.

[0034] Specifically, firstly, the pressure applied to the roof by the loading device during the test, as well as the deformation of the roof under pressure, can be detected in real time using a detection device. This yields pressure data and deformation data of the roof at different times during the test, which are then arranged into a pressure time series. Next, the pressure time series can be divided into multiple data segments according to a set time window, and the average pressure change rate corresponding to each time window can be calculated based on all the pressure data contained in each segment.

[0035] The average pressure change rate reflects the changing trend of pressure experienced by the test point on the roof over a time period. Then, based on the corresponding pressure data and the average pressure change rate, combined with a set time coupling coefficient, the spatiotemporal coupling resultant force at different times can be calculated. The spatiotemporal coupling resultant force comprehensively reflects the overall stress state of the test point on the roof at different times. Then, combining the spatiotemporal coupling resultant force and deformation at different times, the contact area between the loading device and the roof, the material correction coefficient, and the deformation attenuation coefficient, the real-time compressive strength of the roof at different times can be calculated, thereby achieving a dynamic assessment of the roof's compressive strength.

[0036] Finally, using the current moment as a benchmark, the spatiotemporal coupling force corresponding to previous historical moments can be extracted from the calculated historical data according to a set historical time window. Since both prediction and alarm require processing time, to ensure the timeliness of the warning and improve the safety of the warning results, the warning delay time and safety correction coefficient can be introduced when predicting the roof's ultimate load-bearing capacity. Combined with the spatiotemporal coupling force corresponding to the current moment and historical moments, the current ultimate load-bearing capacity of the roof can be calculated to determine whether there are any test risks.

[0037] Example 4 like Figure 4 The flowchart shown illustrates the roof crush resistance test method, which includes: Step A1: Using the above-mentioned roof compressive strength analysis method, analyze and obtain the spatiotemporal coupling force, real-time compressive strength and / or ultimate bearing capacity of the roof at the current moment; Step A2: Compare the spatiotemporal coupling force, real-time compressive strength and / or ultimate bearing capacity with the corresponding alarm thresholds, and determine whether to issue an alarm based on the comparison results.

[0038] Specifically, firstly, the spatiotemporal coupling resultant force, real-time compressive strength, and ultimate bearing capacity of the vehicle roof at the current moment can be calculated using the aforementioned analysis method. Then, the spatiotemporal coupling resultant force, real-time compressive strength, and ultimate bearing capacity can be compared with the corresponding alarm thresholds. If the comparison result is... , or If this occurs, an alarm signal will be triggered immediately to alert staff. Among these, The alarm threshold corresponding to the spatiotemporal coupling force. The alarm threshold corresponding to the real-time compressive strength. This is the alarm threshold corresponding to the ultimate bearing capacity.

[0039] Example 5 like Figure 5 The system block diagram shown is for the roof crush resistance performance analysis system. The analysis system includes: The data acquisition module is configured to acquire the pressure data and deformation amount applied to the roof by the loading device in real time during the test, and to form a pressure time series based on all the acquired pressure data; The windowing calculation module is configured to divide the pressure time series into windows according to a set time window, and calculate the average pressure change rate corresponding to each time window; The spatiotemporal coupling module is configured to calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient. The strength assessment module is configured to dynamically assess the real-time compressive strength of the vehicle roof by using the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, combined with the set material correction coefficient and deformation attenuation coefficient.

[0040] Specifically, the analysis system includes a data acquisition module, a windowing calculation module, a spatiotemporal coupling module, and a strength assessment module. The data acquisition module uses a detection device to monitor in real time the pressure applied to the vehicle roof by the loading device during the test, as well as the deformation of the roof under pressure. It obtains the pressure data and deformation of the roof at different times during the test, and then assembles the pressure data at each time point into a pressure time series. The windowing calculation module divides the pressure time series into multiple data segments according to a set time window, and calculates the average pressure change rate corresponding to each time window based on all the pressure data contained in the corresponding data segment.

[0041] The average pressure change rate reflects the changing trend of pressure experienced by the roof test point over a time period. The spatiotemporal coupling module can calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and the average pressure change rate, combined with a set time coupling coefficient. The spatiotemporal coupling resultant force comprehensively reflects the overall stress state of the roof test point at different times. The strength assessment module can calculate the real-time compressive strength of the roof at different times by combining the spatiotemporal coupling resultant force and deformation at different times, the contact area between the loading device and the roof, the material correction coefficient, and the deformation attenuation coefficient, thereby achieving dynamic assessment of the roof's compressive strength.

[0042] Example 6 like Figure 6 The system block diagram shown is for the roof crush resistance performance analysis system. The analysis system includes: The data acquisition module is configured to acquire the pressure data applied to the roof by the loading device in real time during the test, and to form a pressure time series based on all the acquired pressure data; The windowing calculation module is configured to divide the pressure time series into windows according to a set time window, and calculate the average pressure change rate corresponding to each time window; The spatiotemporal coupling module is configured to calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient. The load-bearing prediction module is configured to predict the ultimate load-bearing capacity of the vehicle roof at the current moment by using the spatiotemporal coupling resultant force corresponding to the current moment and the spatiotemporal coupling resultant force corresponding to the historical moment.

[0043] Specifically, the analysis system includes a data acquisition module, a windowing calculation module, a spatiotemporal coupling module, and a load-bearing prediction module. The data acquisition module monitors the pressure data on the vehicle roof in real time during testing using a detection device, and assembles the measured pressure data for each moment into a pressure time series. The windowing calculation module divides the pressure time series into multiple data segments according to a set time window, and calculates the average pressure change rate for each time window based on all the pressure data contained in each segment. The average pressure change rate reflects the changing trend of pressure experienced by the test point on the roof within a time period. The spatiotemporal coupling module calculates the spatiotemporal coupling resultant force at different moments based on the corresponding pressure data and the average pressure change rate, combined with a set time coupling coefficient. The spatiotemporal coupling resultant force comprehensively reflects the overall stress state of the test point on the roof at different moments. The load-bearing prediction module predicts the ultimate load-bearing capacity of the roof at the current moment based on the spatiotemporal coupling resultant force at the current moment, using the spatiotemporal coupling resultant force at previous historical moments as a reference. The predicted ultimate load-bearing capacity can be used to determine whether there is a test risk at the current moment, and an alarm signal can be issued in time to ensure test safety.

[0044] Example 7 like Figure 7 The system block diagram shown is for the roof crush resistance performance analysis system. The analysis system includes: The data acquisition module is configured to acquire the pressure data and deformation amount applied to the roof by the loading device in real time during the test, and to form a pressure time series based on all the acquired pressure data; The windowing calculation module is configured to divide the pressure time series into windows according to a set time window, and calculate the average pressure change rate corresponding to each time window; The spatiotemporal coupling module is configured to calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient. The strength assessment module is configured to dynamically assess the real-time compressive strength of the vehicle roof by taking into account the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, combined with the set material correction coefficient and deformation attenuation coefficient. The load-bearing prediction module is configured to predict the ultimate load-bearing capacity of the vehicle roof by using the spatiotemporal coupling resultant force at the current moment and the spatiotemporal coupling resultant force at historical moments.

[0045] Specifically, the analysis system includes a data acquisition module, a windowing calculation module, a spatiotemporal coupling module, a strength assessment module, and a load-bearing prediction module. The data acquisition module can detect in real time the pressure applied to the vehicle roof by the loading device during the test, as well as the deformation of the roof under pressure. It obtains the pressure data and deformation of the roof at different times during the test, and assembles the pressure data at each time point into a pressure time series. The windowing calculation module can divide the pressure time series into multiple data segments according to a set time window, and calculate the average pressure change rate corresponding to each time window based on all the pressure data contained in the corresponding data segment.

[0046] The average pressure change rate reflects the changing trend of pressure experienced by the roof test point over a time period. The spatiotemporal coupling module can calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and the average pressure change rate, combined with a set time coupling coefficient. The spatiotemporal coupling resultant force comprehensively reflects the overall stress state of the roof test point at different times. The strength assessment module can calculate the real-time compressive strength of the roof at different times by combining the spatiotemporal coupling resultant force and deformation at different times, the contact area between the loading device and the roof, the material correction coefficient, and the deformation attenuation coefficient, thereby achieving dynamic assessment of the roof's compressive strength.

[0047] The load-bearing prediction module can extract the spatiotemporal coupling force corresponding to previous historical moments from the calculated historical data according to a set historical time window, using the current moment as a benchmark. Since both prediction and alarm require processing time, to ensure the timeliness of the warning and improve the safety of the warning results, an alarm delay time and a safety correction coefficient can be introduced when predicting the roof's ultimate load-bearing capacity. Combining the spatiotemporal coupling force corresponding to the current moment and historical moments, the current ultimate load-bearing capacity of the roof can be calculated to determine whether there are any test risks.

[0048] Example 8 like Figure 8 The system block diagram shown is of a roof crush resistance testing system. The testing system includes: The analysis module is configured with the above-mentioned roof compression performance analysis method to analyze and obtain the spatiotemporal coupling force, real-time compressive strength and / or ultimate bearing capacity of the roof at the current moment; The alarm module is configured to compare the spatiotemporal coupling force, real-time compressive strength and / or ultimate bearing capacity with the corresponding alarm thresholds, and determine whether to issue an alarm based on the comparison results.

[0049] Specifically, the testing system includes an analysis module and an alarm module. The analysis module can calculate the spatiotemporal coupling force, real-time compressive strength, and ultimate bearing capacity of the vehicle roof at the current moment using the aforementioned analysis methods. Then, the spatiotemporal coupling force, real-time compressive strength, and ultimate bearing capacity can be compared with the corresponding alarm thresholds, and an alarm signal can be issued based on the comparison results.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for analyzing the compressive strength of a vehicle roof, characterized in that, include: Real-time acquisition of pressure data and deformation data applied to the roof by the loading device during the test, and the pressure time series composed of all acquired pressure data; The pressure time series is divided into windows according to the set time windows, and the average pressure change rate corresponding to each time window is calculated. Based on the corresponding pressure data and average pressure change rate, the spatiotemporal coupling resultant force at different times is calculated in combination with the set time coupling coefficient. By measuring the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, and combining the material correction coefficient and deformation attenuation coefficient, the real-time compressive strength of the roof is dynamically evaluated.

2. The method for analyzing the compressive strength of a vehicle roof according to claim 1, characterized in that, Acquire data on the pressure exerted on the roof by the loading device, including: Acquire triaxial force data measured by the triaxial force sensor installed on the loading device; The triaxial force data is dynamically corrected based on the position angle between the triaxial force sensor and the loading device, the interference angle between forces in different directions, the environmental vibration acceleration, and the set vibration correction coefficient. Pressure data is determined using the corrected triaxial force data.

3. The method for analyzing the compressive strength of a vehicle roof according to claim 1, characterized in that, Calculate the spatiotemporal coupling resultant force at different times, including: The time coupling coefficient is set according to the vehicle type corresponding to the roof.

4. A method for analyzing the compressive strength of a vehicle roof, characterized in that, include: The pressure data applied to the roof by the loading device during the test is acquired in real time, and a pressure time series is formed based on all the acquired pressure data. The pressure time series is divided into windows according to the set time windows, and the average pressure change rate corresponding to each time window is calculated. Based on the corresponding pressure data and average pressure change rate, the spatiotemporal coupling resultant force at different times is calculated in combination with the set time coupling coefficient. By using the spatiotemporal coupling resultant force at the current moment and the spatiotemporal coupling resultant force at historical moments, the ultimate load-bearing capacity of the vehicle roof at the current moment can be predicted.

5. The method for analyzing the compressive strength of a vehicle roof according to claim 4, characterized in that, Predicting the ultimate load-bearing capacity of the vehicle roof includes: Based on the spatiotemporal coupling force at the current moment and the spatiotemporal coupling force at historical moments, the ultimate load-bearing capacity of the vehicle roof at the current moment is predicted by combining the set warning delay time and safety correction coefficient.

6. A method for analyzing the compressive strength of a vehicle roof, characterized in that, include: Real-time acquisition of pressure data and deformation data applied to the roof by the loading device during the test, and the pressure time series composed of all acquired pressure data; The pressure time series is divided into windows according to the set time windows, and the average pressure change rate corresponding to each time window is calculated. Based on the corresponding pressure data and average pressure change rate, the spatiotemporal coupling resultant force at different times is calculated in combination with the set time coupling coefficient. By measuring the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, and combining the set material correction coefficient and deformation attenuation coefficient, the real-time compressive strength of the roof is dynamically evaluated. The ultimate load-bearing capacity of the vehicle roof can be predicted by using the spatiotemporal coupling resultant force at the current moment and the spatiotemporal coupling resultant force at historical moments.

7. A method for testing the compressive strength of a vehicle roof, characterized in that, include: Using the roof compressive strength analysis method as described in any one of claims 1-6, the spatiotemporal coupling resultant force, real-time compressive strength and / or ultimate bearing capacity of the roof at the current moment are analyzed and obtained; The spatiotemporal coupling force, real-time compressive strength, and / or ultimate bearing capacity are compared with the corresponding alarm thresholds, and an alarm is issued based on the comparison results.

8. A roof crush resistance performance analysis system, characterized in that, include: The data acquisition module is configured to acquire the pressure data and deformation amount applied to the roof by the loading device in real time during the test, and to form a pressure time series based on all the acquired pressure data; The windowing calculation module is configured to divide the pressure time series into windows according to a set time window, and calculate the average pressure change rate corresponding to each time window; The spatiotemporal coupling module is configured to calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient. The strength assessment module is configured to dynamically assess the real-time compressive strength of the vehicle roof by using the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, combined with the set material correction coefficient and deformation attenuation coefficient.

9. A vehicle roof crush resistance performance analysis system, characterized in that, include: The data acquisition module is configured to acquire the pressure data applied to the roof by the loading device in real time during the test, and to form a pressure time series based on all the acquired pressure data; The windowing calculation module is configured to divide the pressure time series into windows according to a set time window, and calculate the average pressure change rate corresponding to each time window; The spatiotemporal coupling module is configured to calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient. The load-bearing prediction module is configured to predict the ultimate load-bearing capacity of the vehicle roof at the current moment by using the spatiotemporal coupling resultant force corresponding to the current moment and the spatiotemporal coupling resultant force corresponding to the historical moment.

10. A vehicle roof crush resistance performance analysis system, characterized in that, include: The data acquisition module is configured to acquire the pressure data and deformation amount applied to the roof by the loading device in real time during the test, and to form a pressure time series based on all the acquired pressure data; The windowing calculation module is configured to divide the pressure time series into windows according to a set time window, and calculate the average pressure change rate corresponding to each time window; The spatiotemporal coupling module is configured to calculate the spatiotemporal coupling resultant force at different times based on the corresponding pressure data and average pressure change rate, combined with the set time coupling coefficient. The strength assessment module is configured to dynamically assess the real-time compressive strength of the vehicle roof by taking into account the contact area between the loading device and the roof, as well as the spatiotemporal coupling force and deformation at different times, combined with the set material correction coefficient and deformation attenuation coefficient. The load-bearing prediction module is configured to predict the ultimate load-bearing capacity of the vehicle roof by using the spatiotemporal coupling resultant force at the current moment and the spatiotemporal coupling resultant force at historical moments.

11. A vehicle roof crush resistance performance testing system, characterized in that, include: The analysis module is configured to use the roof compressive performance analysis method as described in any one of claims 1-6 to analyze and obtain the spatiotemporal coupling resultant force, real-time compressive strength and / or ultimate bearing capacity of the roof at the current moment; The alarm module is configured to compare the spatiotemporal coupling force, real-time compressive strength and / or ultimate bearing capacity with the corresponding alarm thresholds, and determine whether to issue an alarm based on the comparison results.

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