A method and system for securely transmitting asphalt mixture compaction monitoring data

Abstract

The present invention relates to the technical field of pavement data monitoring, and in particular to a method and system for securely transmitting asphalt mixture compaction monitoring data. The method obtains a pavement temperature sequence of a road section to be compacted, and obtains compaction anomaly based on pavement temperature difference data in a subsequence of the pavement temperature sequence and its discreteness; combines the difference in compaction anomaly between different subsequences, the position of the subsequence in the pavement temperature sequence, and the ambient temperature data at the corresponding moment of the pavement temperature difference data in the subsequence to obtain the temperature adjustment amplitude, and uses the pavement temperature difference data in the corrected subsequence to obtain a corrected pavement temperature sequence, and screens the pavement temperature difference data based on the compaction anomaly of the corrected subsequence of the corrected pavement temperature sequence for transmission. The present invention corrects the pavement temperature by combining the roller operation time and the ambient temperature to improve the transmission quality of the monitoring data of the asphalt mixture during the compaction process.

Description

Technical Field

[0001] The present invention relates to the technical field of pavement data monitoring, and in particular to a method and system for securely transmitting asphalt mixture compaction monitoring data. Background Art

[0002] The temperature of asphalt mixture during the pavement compaction stage directly affects the density and porosity of the asphalt mixture, and thus affects the pavement compaction quality. If the asphalt paving compaction quality is poor, it is easy to cause problems such as cracks and potholes in the pavement during use, shortening the service life of the pavement; in addition, poor compaction quality will also cause uneven pavement, affecting the comfort of vehicle driving, and may even increase the incidence of traffic accidents. Therefore, it is very important to monitor the temperature data of asphalt mixture during the compaction process.

[0003] The existing method detects the compaction degree of asphalt pavement by analyzing the temperature change of the pavement before and after compaction, but does not take into account the impact of the ambient temperature during compaction and the temperature increase during the operation of the roller on the pavement temperature; high or low ambient temperature affects the heat dissipation rate of the asphalt pavement. As the running time of the roller increases, the number of frictions between the roller wheel and the pavement increases, causing the wheel surface temperature to rise. Since the roller wheel conducts heat to the pavement, the temperature difference of the pavement before and after rolling of the asphalt mixture material pavement becomes smaller; this causes errors in the monitoring data of the asphalt mixture during the compaction process, which in turn leads to poor transmission quality of the monitoring data of the asphalt mixture during the compaction process. Summary of the invention

[0004] In order to solve the technical problem that the monitoring data in the compaction process has errors due to the change of the surface temperature of the roller wheel and the ambient temperature, resulting in poor transmission quality of the monitoring data in the asphalt mixture during the compaction process, the purpose of the present invention is to provide a method and system for secure transmission of asphalt mixture compaction monitoring data. The technical scheme adopted is as follows:

[0005] In a first aspect, an embodiment of the present invention provides a method for securely transmitting asphalt mixture compaction monitoring data, the method comprising:

[0006] Obtaining a road surface temperature sequence consisting of road surface temperature difference data at each moment in a set time period of the road section to be compacted;

[0007] Dividing the road surface temperature sequence into different subsequences; obtaining the compaction anomaly degree of each subsequence according to the discrete degree of the road surface temperature difference data and the road surface temperature difference data in each subsequence;

[0008] According to the difference between the compaction anomalies of different subsequences, the position of each subsequence in the road surface temperature sequence, and the ambient temperature data at the time corresponding to the road surface temperature difference data in each subsequence, the temperature adjustment amplitude of each subsequence is obtained; the road surface temperature difference data in each subsequence is corrected by using the temperature adjustment amplitude to obtain a corrected road surface temperature sequence;

[0009] The modified pavement temperature sequence is divided into different modified subsequences; and the pavement temperature difference data in the modified pavement temperature sequence is screened for transmission according to the compaction anomaly of each modified subsequence.

[0010] Furthermore, obtaining the compaction abnormality of each subsequence specifically includes:

[0011] The cumulative sum of all road surface temperature difference data in each subsequence is used as the overall temperature difference index of each subsequence; the temperature dispersion index of each subsequence is obtained according to the road surface temperature difference data in each subsequence;

[0012] The compaction anomaly degree of each subsequence is obtained according to the overall temperature difference index and the temperature dispersion index.

[0013] Furthermore, obtaining the temperature adjustment amplitude of each subsequence specifically includes:

[0014] Selecting an analysis subsequence from the subsequences according to the compaction abnormality; for all analysis subsequences, taking the average of the difference between the compaction abnormality of each analysis subsequence and the next adjacent analysis subsequence as the overall influence;

[0015] The difference between the time corresponding to the first road surface temperature difference data in each subsequence and the time corresponding to the first road surface temperature difference data in the road surface temperature sequence is taken as the running time of each subsequence; the average of the ambient temperature data at the time corresponding to all road surface temperature difference data in each subsequence is taken as the overall ambient temperature value of each subsequence;

[0016] The temperature adjustment amplitude of each subsequence is obtained according to the running time of each subsequence, the overall value of the ambient temperature and the overall influence.

[0017] Furthermore, the method of using the temperature adjustment amplitude to correct the road surface temperature difference data in each subsequence to obtain a corrected road surface temperature sequence specifically includes:

[0018] The sum of the temperature adjustment amplitude and the constant 1 is used as the temperature correction coefficient of each subsequence; each road surface temperature difference data in each subsequence is weighted by the temperature correction coefficient to obtain the corrected temperature difference data corresponding to each road surface temperature difference data in each subsequence;

[0019] Each road surface temperature difference data in the road surface temperature sequence is updated to the corresponding corrected temperature difference data, and the updated road surface temperature sequence is used as the corrected road surface temperature sequence.

[0020] Furthermore, the step of filtering and transmitting the road surface temperature difference data in the modified road surface temperature sequence according to the compaction anomaly degree of each modified subsequence specifically includes:

[0021] According to the preset screening interval of each correction subsequence and the compaction abnormality, a standard screening interval of each correction subsequence is obtained;

[0022] The road surface temperature difference data in each correction subsequence is screened using the standard screening interval, and the screened road surface temperature difference data is transmitted.

[0023] Furthermore, the step of obtaining a standard screening interval for each correction subsequence specifically includes:

[0024] The compaction anomaly degree of each correction subsequence is negatively correlated and normalized, and the product of the processing result and the preset screening interval is rounded to obtain the standard screening interval of each correction subsequence.

[0025] Furthermore, dividing the road surface temperature sequence into different subsequences specifically includes:

[0026] The extreme value of the road surface temperature difference data in the road surface temperature sequence is obtained; in the road surface temperature sequence, the road surface temperature difference data between two adjacent extreme values ​​constitute a subsequence.

[0027] Furthermore, the temperature dispersion index of each subsequence is the extreme difference of the road surface temperature difference data in the corresponding subsequence.

[0028] Further, the obtaining of the temperature adjustment amplitude of each subsequence according to the running time of each subsequence, the overall value of the ambient temperature and the overall influence degree specifically includes:

[0029] The product of the running time of each subsequence, the overall value of the ambient temperature and the overall influence is normalized to obtain the temperature adjustment amplitude of each subsequence.

[0030] In a second aspect, another embodiment of the present invention provides a system for securely transmitting asphalt mixture compaction monitoring data, the system comprising:

[0031] A data acquisition module is used to obtain a road surface temperature sequence consisting of road surface temperature difference data at each moment in a set time period of the road section to be compacted;

[0032] An abnormality analysis module is used to divide the road surface temperature sequence into different subsequences; and obtain the compaction abnormality of each subsequence according to the discrete degree of the road surface temperature difference data and the road surface temperature difference data in each subsequence;

[0033] The temperature adjustment module is used to obtain the temperature adjustment amplitude of each subsequence according to the difference between the compaction anomalies of different subsequences, the position of each subsequence in the road surface temperature sequence, and the ambient temperature data at the corresponding moment of the road surface temperature difference data in each subsequence; and to correct the road surface temperature difference data in each subsequence using the temperature adjustment amplitude to obtain a corrected road surface temperature sequence;

[0034] The data transmission module is used to divide the modified pavement temperature sequence into different modified subsequences; and select the pavement temperature difference data in the modified pavement temperature sequence according to the compaction anomaly of each modified subsequence for transmission.

[0035] The present invention has the following beneficial effects:

[0036] In an embodiment of the present invention, in order to improve the accuracy of subsequent compaction effect analysis, the pavement temperature sequence is divided into subsequences; the pavement temperature difference data directly reflects the compaction effect of the road section corresponding to the subsequence. Under normal conditions of asphalt mixture compaction, the pavement temperature difference before and after compaction at different pavement positions should be relatively close, and the discrete degree of the pavement temperature difference data reflects the compaction effect of the road section corresponding to the subsequence. The compaction anomaly degree is obtained by combining the above two factors to improve the accuracy of the compaction anomaly degree in measuring the compaction effect of the road section; higher or lower ambient temperature will affect the heat dissipation speed of the asphalt pavement, and the increase in the running time of the roller will increase the surface temperature of the roller wheel and conduct heat to the pavement, affecting the pavement temperature difference before and after compaction of the asphalt pavement, that is, the accuracy of the pavement temperature difference data; the position of the subsequence in the pavement temperature sequence reflects the running time of the roller, and different subsequences The difference in compaction anomaly reflects the degree of influence of the roller operation time and the ambient temperature as a whole on the temperature change of the road surface before and after compaction, and is analyzed in combination with the ambient temperature to obtain the temperature adjustment amplitude, which is used to indicate the interference degree of the required adjustment degree of the temperature difference of the road surface before and after compaction under the influence of the roller operation time and the ambient temperature; the temperature adjustment amplitude is used to correct the road surface temperature difference data to obtain a corrected road surface temperature sequence, so as to reduce the influence of the roller operation time and the ambient temperature on the road surface temperature difference before and after compaction; the road surface temperature difference data is adaptively filtered according to the compaction anomaly of the corrected subsequence in the corrected road surface temperature sequence, so as to avoid excessive data transmission volume while making the filtered data effectively reflect the compaction problem of the road section to be compacted, thereby ensuring the accurate transmission of the compaction problem information of the road section to be compacted and improving the data quality and security during the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A flowchart of the steps of a method for securely transmitting asphalt mixture compaction monitoring data provided by one embodiment of the present invention;

[0039] Figure 2 A flowchart of a method for obtaining a temperature adjustment range provided by an embodiment of the present invention;

[0040] Figure 3 A structural diagram of a system for securely transmitting asphalt mixture compaction monitoring data provided by one embodiment of the present invention;

[0041] Figure 4 A schematic diagram of a computer device for securely transmitting data for monitoring compaction of asphalt mixtures provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the method and system for secure transmission of asphalt mixture compaction monitoring data proposed by the present invention, its specific implementation method, structure, characteristics and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0043] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0044] The specific scheme of the method and system for securely transmitting asphalt mixture compaction monitoring data provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Embodiment 1:

[0046] The present invention proposes a method for securely transmitting asphalt mixture compaction monitoring data. Figure 1 , which shows a flowchart of the steps of a method for securely transmitting asphalt mixture compaction monitoring data provided by an embodiment of the present invention, the method comprising:

[0047] Step S1: Obtain a road surface temperature sequence consisting of road surface temperature difference data at each moment in a set time period of a road section to be compacted.

[0048] Infrared temperature sensors are installed at the front and rear of the roller. The infrared temperature sensor at the front is used to detect the road surface temperature data before compaction, and the infrared temperature sensor at the rear is used to detect the road surface temperature data after compaction. The roller travels from one end of the road section to be compacted to the other end at a uniform speed. When the roller is running, the infrared temperature sensors at the front and rear of the roller simultaneously start to detect the road surface temperature data at different road surface positions on the road section to be compacted before and after compaction.

[0049] Select a position on the road section to be compacted as the target position. If the sensor at the front position detects the road surface temperature data of the target position before compaction at the tth time, the road surface temperature data of the target position after compaction is the road surface temperature data of the sensor at the rear position at the tth time. The data collected at each moment; where L is the length of the roller, i.e., the horizontal distance between the infrared temperature sensors at the front and rear of the roller, and v is the speed of the roller.

[0050] In this embodiment, the time period between the corresponding moments when the infrared temperature sensor at the head of the roller collects the data at the two ends of the road section to be compacted is used as the set time period; within the set time period, taking the tth moment within the set time period as an example, the infrared temperature sensor at the head of the roller collects the data at the tth moment within the set time period. The road surface temperature data at the moment is compared with the infrared temperature sensor at the rear of the roller. The difference between the road surface temperature data at the t-th moment is used as the initial road surface temperature difference data at the t-th moment in the set time period; according to the above method, the initial road surface temperature difference data at each moment in the set time period is obtained.

[0051] The data collected by the sensor may contain errors. In order to better reflect the overall trend and changes of the temperature data, the initial road surface temperature difference data within the set time period is smoothed. The specific processing is as follows: a rectangular coordinate system is established with time as the horizontal axis and the initial road surface temperature difference data as the vertical axis. The initial road surface temperature difference data at all times within the set time period are marked in the rectangular coordinate system to obtain the coordinate points at the corresponding time; the coordinate points in the rectangular coordinate system are curve fitted to obtain a fitted temperature curve, and the vertical coordinates of the corresponding points on the fitted temperature curve at each time within the set time period are used as the road surface temperature difference data at the corresponding time. The road surface temperature difference data at all times within the set time period are arranged in time sequence to obtain a road surface temperature sequence. At the same time, the ambient temperature data at each time within the set time period is collected through the outdoor temperature sensor.

[0052] It should be noted that the infrared temperature sensors at the front and rear of the roller and the outdoor temperature sensor have the same data acquisition frequency, which is once every 1 millisecond. The implementer can set it according to the specific situation. This embodiment uses the least squares method to perform curve fitting on the coordinate points in the rectangular coordinate system, where the least squares method is a well-known technology and will not be described in detail here. The elements in the road surface temperature sequence are road surface temperature difference data.

[0053] As the density of the asphalt mixture increases during the compaction process, resulting in an increase in the rate of heat conduction and dissipation, the temperature of the road surface after compaction will be lower than that before compaction, that is, the road surface temperature difference data at each moment is greater than zero.

[0054] Step S2: Divide the road surface temperature sequence into different subsequences; and obtain the compaction anomaly degree of each subsequence according to the discrete degree of the road surface temperature difference data and the road surface temperature difference data in each subsequence.

[0055] The pavement temperature difference data reflects the compaction effect at different positions of the road section to be compacted. In order to improve the accuracy of the subsequent compaction effect analysis, the pavement temperature sequence is divided into different subsequences based on the degree of fluctuation of the pavement temperature difference data. The method for obtaining the subsequence in the embodiment of the present invention is: obtaining the extreme value of the pavement temperature difference data in the pavement temperature sequence; in the pavement temperature sequence, the pavement temperature difference data between two adjacent extreme values ​​constitute a subsequence. It should be noted that the elements between the first pavement temperature difference data and the first extreme value in the pavement temperature sequence constitute the first subsequence, and the elements between the last extreme value and the last pavement temperature difference data in the pavement temperature sequence constitute the last subsequence.

[0056] When the asphalt mixture is compacted normally, the density of the asphalt mixture is large, thereby reducing heat loss; when the asphalt mixture is compacted abnormally, the density of the asphalt mixture is low, and there are more gaps, which leads to accelerated heat loss; therefore, the degree of temperature reduction of the asphalt pavement before and after compaction by the roller is greater under abnormal compaction conditions than under normal conditions, that is, the pavement temperature difference data under abnormal compaction conditions is greater than the pavement temperature difference data under normal compaction conditions.

[0057] The pavement temperature difference data in the subsequence directly reflects the compaction effect of the road section corresponding to the subsequence; under normal asphalt mixture compaction, the pavement temperature reduction degree at different pavement locations before and after compaction should be relatively close, that is, the discrete degree of the pavement temperature difference data should be small, and the discrete degree of the pavement temperature difference data in the subsequence reflects the compaction effect of the road section corresponding to the subsequence; the compaction anomaly degree is obtained by combining the above two factors to improve the accuracy of the compaction anomaly degree in measuring the compaction effect of the road section.

[0058] Preferably, in some possible implementation modes of the embodiments of the present invention, the method for obtaining the compaction abnormality includes: taking the cumulative sum of all road surface temperature difference data in each subsequence as the overall temperature difference index of each subsequence; obtaining the temperature discrete index of each subsequence according to the road surface temperature difference data in each subsequence; and obtaining the compaction abnormality of each subsequence according to the overall temperature difference index and the temperature discrete index.

[0059] It should be noted that indicators such as the range, interquartile range, variance and coefficient of dispersion can reflect the degree of dispersion of a set of data. In this embodiment, the range of the road surface temperature difference data in each subsequence is used as the temperature dispersion indicator of the corresponding subsequence. In other embodiments, the range can also be replaced by the interquartile range, variance and coefficient of dispersion.

[0060] If the overall temperature difference index is larger, it means that the heat loss of the road section corresponding to the subsequence is faster, and the compaction effect of the road section corresponding to the subsequence is more abnormal; if the temperature dispersion index is larger, it means that the fluctuation of the road surface temperature reduction degree before and after compaction of the road section corresponding to the subsequence is larger, and the compaction effect of the road section corresponding to the subsequence is more abnormal; therefore, the overall temperature difference index and the temperature dispersion index are both positively correlated with the compaction abnormality. In a specific implementation of the embodiment of the present invention, the compaction abnormality of each subsequence is expressed by the formula:

[0061]

[0062] Where Q is the compaction anomaly of each subsequence; N is the total number of pavement temperature difference data in each subsequence; The nth road surface temperature difference data in each subsequence; is the maximum value of all road surface temperature difference data in each subsequence; The minimum value of all road surface temperature difference data in each subsequence; is the overall temperature difference index for each subsequence; is the temperature discrete index of each subsequence; Norm is the normalization function. It should be noted that when the compaction abnormality Q is larger, the difference in compaction effects at different positions in the subsequence corresponding section is larger, and the compaction effect of the subsequence corresponding section is more abnormal.

[0063] Step S3: According to the difference between the compaction anomalies of different subsequences, the position of each subsequence in the pavement temperature sequence, and the ambient temperature data at the corresponding moment of the pavement temperature difference data in each subsequence, the temperature adjustment amplitude of each subsequence is obtained; the pavement temperature difference data in each subsequence is corrected using the temperature adjustment amplitude to obtain a corrected pavement temperature sequence.

[0064] As the roller's running time increases, the roller's wheels rub against the road surface more often, causing the wheel surface temperature to rise. The roller's wheels contact the road surface and conduct heat, causing the difference in the road surface temperature before and after compaction of the asphalt road surface to be different from the actual situation. Higher or lower ambient temperatures affect the heat dissipation rate of the asphalt road surface, causing the difference in the road surface temperature before and after compaction of the asphalt road surface to be different from the actual situation. Therefore, the roller's running time and ambient temperature will interfere with the degree of change in the road surface temperature before and after compaction.

[0065] The compaction anomaly of different subsequences reflects the overall influence of the roller operation time and the ambient temperature on the temperature change of the pavement before and after compaction. The position of each subsequence in the pavement temperature sequence reflects the time required for the roller to run to the corresponding section of each subsequence, that is, the roller operation time. The temperature adjustment range is obtained by combining the ambient temperature data for analysis, which is used to measure the required adjustment degree of the temperature difference of the pavement before and after compaction under the influence of the roller operation time and the ambient temperature.

[0066] See also Figure 2 , which shows a flow chart of steps of a method for obtaining a temperature adjustment range provided by an embodiment of the present invention, the method comprising:

[0067] Step S310: selecting an analysis subsequence from the subsequences according to the compaction abnormality; for all analysis subsequences, taking the average of the difference between the compaction abnormality of each analysis subsequence and its next adjacent analysis subsequence as the overall influence.

[0068] The more abnormal the compaction effect of the road section corresponding to the subsequence with a greater degree of compaction anomaly, the more abnormal the compaction effect. The more normal the compaction effect is, the more likely it is that the road surface temperature change before and after compaction is caused by the roller wheel surface temperature and the ambient temperature. The road surface temperature difference data corresponding to the road section with a more normal compaction effect is more meaningful for analyzing the degree of adjustment of the roller operation time and the ambient temperature on the road surface temperature change before and after compaction. Therefore, in this embodiment of the invention, for all subsequences in the road surface temperature sequence, the subsequence with a degree of compaction anomaly less than the compaction anomaly threshold is used as the analysis subsequence; the above interference degree is analyzed using the analysis subsequence.

[0069] The average of the absolute values ​​of the differences between the compaction anomaly of each analysis subsequence and its adjacent next analysis subsequence is taken as the overall influence. The greater the overall influence, the greater the influence of the roller operation time and the ambient temperature on the temperature change of the pavement before and after compaction, and the greater the degree of adjustment required for the temperature change of the pavement before and after compaction.

[0070] It should be noted that if the road surface temperature sequence has only three subsequences, the first and third subsequences are analysis subsequences, and the next analysis subsequence adjacent to the first subsequence is the third subsequence. In the embodiment of the present invention, the compaction abnormality threshold takes an empirical value of 0.5, and the implementer can set it according to the specific situation.

[0071] Step S320: The difference between the time corresponding to the first road surface temperature difference data in each subsequence and the time corresponding to the first road surface temperature difference data in the road surface temperature sequence is used as the running time of each subsequence; the average of the ambient temperature data at the time corresponding to all road surface temperature difference data in each subsequence is used as the overall ambient temperature value of each subsequence.

[0072] This embodiment measures the position of each subsequence in the road surface temperature sequence by the difference between each subsequence and the first road surface temperature difference data corresponding to the time in the road surface temperature sequence, thereby reflecting the operation time of the road roller to the road section corresponding to each subsequence. The overall value of the ambient temperature of the subsequence reflects the overall ambient temperature at the time corresponding to the road surface temperature difference data in the subsequence.

[0073] Step S330: obtaining the temperature adjustment range of each subsequence according to the running time of each subsequence, the overall value of the ambient temperature and the overall influence.

[0074] When the roller's running time increases, the friction between the roller wheel and the road surface and the friction between the parts of the wheel itself increase, resulting in an increase in the wheel surface temperature. The roller wheel contacts the asphalt road surface and conducts heat, resulting in a smaller temperature difference between the asphalt road surface before and after compaction, which is better than the actual compaction effect. That is, in the actual situation, the temperature difference between the asphalt road surface before and after compaction should be larger. If the roller's running time increases, the greater the impact of the roller wheel surface heat conduction on the temperature difference between the asphalt road surface before and after compaction, the road surface temperature difference data should be increased during correction.

[0075] Ambient temperature also affects the analysis of pavement compaction. For example, a higher ambient temperature reduces the heat dissipation rate of the asphalt pavement, making the temperature difference of the pavement before and after compaction smaller, and the compaction effect is better than the actual situation. In fact, the temperature difference of the asphalt pavement before and after compaction should be larger, and the pavement temperature difference data should be increased during correction; a lower ambient temperature accelerates the heat dissipation rate of the asphalt pavement, making the temperature difference of the pavement before and after compaction larger, and the compaction effect is worse than the actual situation. In fact, the temperature difference of the asphalt pavement before and after compaction should be smaller, and the pavement temperature difference data should be reduced during correction.

[0076] If the overall influence is greater, the overall influence of the roller operation time and the ambient temperature on the temperature change of the road surface before and after compaction is greater, and the adjustment degree of the road surface temperature difference data is greater during correction. The overall influence is corrected using the operation time and the overall value of the ambient temperature to obtain the specific adjustment degree of the roller operation time and the ambient temperature on the road surface temperature difference data. Therefore, the operation time, the overall value of the ambient temperature and the overall influence are all positively correlated with the temperature adjustment range. In this embodiment, the product of the operation time, the overall value of the ambient temperature and the overall influence of each subsequence is normalized to obtain the temperature adjustment range of each subsequence.

[0077] In a specific implementation of the embodiment of the present invention, the temperature adjustment amplitude of each subsequence is expressed by the formula:

[0078]

[0079] In the formula, is the temperature adjustment amplitude of the kth subsequence in the pavement temperature sequence; M is the total number of analyzed subsequences in the pavement temperature sequence; is the compaction anomaly of the mth analysis subsequence in the pavement temperature sequence; is the compaction anomaly of the m-1th analysis subsequence in the pavement temperature sequence; is the running time of the kth subsequence in the road surface temperature sequence; is the overall value of the ambient temperature of the kth subsequence in the road surface temperature sequence; is the overall impact; is the absolute value function; tanh is the hyperbolic tangent function. It should be noted that the range of the temperature adjustment amplitude is .

[0080] The pavement temperature difference data in each subsequence is corrected by using the temperature adjustment amplitude to obtain the corrected temperature difference data, which can reduce the influence of roller operation time and ambient temperature on the pavement temperature difference data and improve the accuracy of the pavement temperature difference before and after compaction of the asphalt pavement.

[0081] Preferably, in some possible implementation methods of the embodiments of the present invention, the method for correcting the road surface temperature difference data includes: taking the sum of the temperature adjustment amplitude and the constant 1 as the temperature correction coefficient for each subsequence; using the temperature correction coefficient to weight each road surface temperature difference data in each subsequence to obtain the corrected temperature difference data corresponding to each road surface temperature difference data in each subsequence.

[0082] In a specific implementation of the embodiment of the present invention, the corrected temperature difference data corresponding to each road surface temperature difference data in each subsequence is expressed by the formula:

[0083]

[0084] In the formula, is the corrected temperature difference data corresponding to the a-th road surface temperature difference data in the k-th subsequence in the road surface temperature sequence; is the ath road surface temperature difference data in the kth subsequence in the road surface temperature sequence; is the temperature adjustment amplitude of the kth subsequence in the road surface temperature sequence.

[0085] The road surface temperature difference data is corrected by the road compactor operation time and the ambient temperature, so that the corrected temperature difference data can more standardly present the actual road surface compaction situation. Each road surface temperature difference data in the road surface temperature sequence is updated to its corresponding corrected temperature difference data, and the updated road surface temperature sequence is used as the corrected road surface temperature sequence.

[0086] Step S4: Divide the corrected pavement temperature sequence into different corrected subsequences; and select the pavement temperature difference data in the corrected pavement temperature sequence for transmission according to the compaction anomaly of each corrected subsequence.

[0087] To facilitate data transmission, the corrected pavement temperature sequence is divided into different corrected subsequences, and the compaction anomaly of the corrected subsequences is obtained. It should be noted that the method of dividing the corrected pavement temperature sequence into different corrected subsequences is the same as the method of dividing the pavement temperature sequence into different subsequences; the compaction anomaly of the corrected subsequence is obtained in the same way as the compaction anomaly of the subsequence, which will not be repeated here. The elements in the corrected subsequence are the corrected temperature difference data.

[0088] The larger the compaction anomaly of the modified subsequence, the worse the compaction effect of the corresponding road section. In order to analyze the compaction problems of the road section to be compacted, more data should be retained for the road section with poor compaction effect, and the data of the road section with good compaction effect can be appropriately deleted. Therefore, according to the compaction anomaly of the modified subsequence, data is selected from the modified road surface temperature sequence for transmission. The specific selection method is:

[0089] The compaction anomaly degree of each corrected subsequence is negatively correlated and normalized, and the product of the processing result and the preset screening interval is rounded to obtain the standard screening interval of each corrected subsequence.

[0090] The standard screening interval is equivalent to the sampling frequency of the elements in the correction subsequence; the smaller the standard screening interval, the more elements are screened from the correction subsequence; the larger the standard screening interval, the fewer elements are screened from the correction subsequence. The corrected temperature difference data of the section with the worse compaction effect can better reflect the compaction problems of the section to be compacted. The section with poor compaction effect should retain more data, and the larger the compaction anomaly, the worse the compaction effect of the corresponding section of the correction subsequence. Therefore, the compaction anomaly of the correction subsequence is negatively correlated with the standard screening interval.

[0091] It should be noted that in the embodiment of the present invention, the Norm function is used for normalization processing, and the exponential function with a natural constant as the base is used for negative correlation mapping. Other normalization methods and negative correlation mapping methods can also be used, which are not limited here. The standard screening interval is a positive integer and is less than or equal to the total number of elements in each correction subsequence; in the embodiment of the present invention, the result of rounding up one-fifth of the total number of elements in each correction subsequence is used as the preset screening interval of the corresponding correction subsequence, and the implementer can set it according to the specific situation.

[0092] The corrected temperature difference data in each correction subsequence is screened using a standard screening interval. Specifically, for each correction subsequence, starting from the first element in the correction subsequence, data is collected once every standard screening interval elements, and the correction subsequence is traversed to obtain the corrected temperature difference data that needs to be transmitted in the correction subsequence.

[0093] As an example, if the modified subsequence A , assuming that the standard screening interval of the correction subsequence A is 1, the corrected temperature difference data screened from the correction subsequence A according to the standard screening interval 1 includes: , , , Assuming that the standard screening interval of the correction subsequence A is 3, the corrected temperature difference data screened from the correction subsequence A according to the standard screening interval 3 includes: , .

[0094] The corrected temperature difference data obtained from all the corrected subsequences in the corrected road surface temperature sequence is compressed and transmitted. Specifically, run-length encoding is used to compress the data, and the compressed data is sent to the server through the WebSocket communication protocol; an application programming interface (API) is created on the server side to receive the data. After that, the received data is stored in the database for later call analysis.

[0095] This scheme first corrects the road surface temperature difference data of the road section to be compacted within a set time period to reduce the impact of the roller running time and ambient temperature; then, the corrected road surface temperature difference data is adaptively selected based on the road surface compaction effect, and then the above data is transmitted. The above data can effectively reflect the problems existing in the compaction process of the road section to be compacted, thereby ensuring the accurate transmission of the compaction problem information of the road section to be compacted, and improving the data quality and security during the transmission process.

[0096] So far, the present invention is completed.

[0097] Embodiment 2:

[0098] The present invention proposes a safe transmission system for monitoring data of asphalt mixture compaction. Figure 3 , which shows a structural diagram of a system for secure transmission of asphalt mixture compaction monitoring data provided by an embodiment of the present invention, the system comprising:

[0099] The data acquisition module 510 is used to obtain a road surface temperature sequence consisting of road surface temperature difference data at each moment in a set time period of the road section to be compacted;

[0100] The abnormality analysis module 520 is used to divide the road surface temperature sequence into different subsequences according to the fluctuation degree of the road surface temperature difference data; and obtain the compaction abnormality of each subsequence according to the discrete degree of the road surface temperature difference data and the road surface temperature difference data in each subsequence;

[0101] The temperature adjustment module 530 is used to obtain the temperature adjustment amplitude of each subsequence according to the difference between the compaction anomalies of different subsequences, the position of each subsequence in the road surface temperature sequence, and the ambient temperature data at the time corresponding to the road surface temperature difference data in each subsequence; and to correct the road surface temperature difference data in each subsequence using the temperature adjustment amplitude to obtain a corrected road surface temperature sequence;

[0102] The data transmission module 540 is used to divide the modified pavement temperature sequence into different modified subsequences; and select the pavement temperature difference data in the modified pavement temperature sequence according to the compaction anomaly of each modified subsequence for transmission.

[0103] It should be noted that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device can be divided into different functional modules to complete all or part of the functions described above. In addition, the asphalt mixture compaction monitoring data security transmission system and the asphalt mixture compaction monitoring data security transmission method embodiment provided in the above embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0104] Embodiment 3:

[0105] Figure 4 A computer device schematic diagram of a device for securely transmitting data of asphalt mixture compaction monitoring provided by an embodiment of the present invention. Figure 4 As shown, the computer device includes: a memory 601, a processor 602, and a computer program 603 stored in the memory 601 and running on the processor 602, wherein when the processor 602 executes the computer program 603, the computer device can execute any one of the asphalt mixture compaction monitoring data secure transmission methods introduced above.

[0106] In addition, an embodiment of the present application also protects a device, which may include a memory and a processor, wherein the memory stores an executable program code, and the processor is used to call and execute the executable program code to execute a method for securely transmitting asphalt mixture compaction monitoring data provided in an embodiment of the present application.

[0107] In this embodiment, the functional modules of the device can be divided according to the above method example. For example, each functional module can be corresponded, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0108] It should be understood that the device provided in this embodiment is used to execute the above-mentioned method for securely transmitting asphalt mixture compaction monitoring data, and thus can achieve the same effect as the above-mentioned implementation method.

[0109] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to a device, the processing module may be used to control and manage the actions of the device. The storage module may be used to support the device to execute mutual program codes, etc.

[0110] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits disclosed in the present application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0111] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0112] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for securely transmitting asphalt mixture compaction monitoring data, characterized in that: The method includes: Obtaining a road surface temperature sequence consisting of road surface temperature difference data at each moment in a set time period of the road section to be compacted; Dividing the road surface temperature sequence into different subsequences; obtaining the compaction anomaly degree of each subsequence according to the discrete degree of the road surface temperature difference data and the road surface temperature difference data in each subsequence; According to the difference between the compaction anomalies of different subsequences, the position of each subsequence in the road surface temperature sequence, and the ambient temperature data at the time corresponding to the road surface temperature difference data in each subsequence, the temperature adjustment amplitude of each subsequence is obtained; the road surface temperature difference data in each subsequence is corrected by using the temperature adjustment amplitude to obtain a corrected road surface temperature sequence; Dividing the modified pavement temperature sequence into different modified subsequences; screening the pavement temperature difference data in the modified pavement temperature sequence according to the compaction anomaly of each modified subsequence for transmission; The obtaining of the compaction abnormality of each subsequence specifically includes: The cumulative sum of all road surface temperature difference data in each subsequence is used as the overall temperature difference index of each subsequence; the temperature dispersion index of each subsequence is obtained according to the road surface temperature difference data in each subsequence; Obtaining the compaction anomaly degree of each subsequence according to the overall temperature difference index and the temperature dispersion index; The compaction anomaly of each subsequence is expressed as: Where Q is the compaction anomaly of each subsequence; N is the total number of pavement temperature difference data in each subsequence; The nth road surface temperature difference data in each subsequence; is the maximum value of all road surface temperature difference data in each subsequence; The minimum value of all road surface temperature difference data in each subsequence; is the overall temperature difference index for each subsequence; is the temperature discrete index of each subsequence; Norm is the normalization function; The obtaining of the temperature adjustment amplitude of each subsequence specifically includes: Selecting an analysis subsequence from the subsequences according to the compaction abnormality; for all analysis subsequences, taking the average of the difference between the compaction abnormality of each analysis subsequence and the next adjacent analysis subsequence as the overall influence; The difference between the time corresponding to the first road surface temperature difference data in each subsequence and the time corresponding to the first road surface temperature difference data in the road surface temperature sequence is taken as the running time of each subsequence; the average of the ambient temperature data at the time corresponding to all road surface temperature difference data in each subsequence is taken as the overall ambient temperature value of each subsequence; Obtaining a temperature adjustment amplitude for each subsequence according to the running time of each subsequence, the overall value of the ambient temperature, and the overall impact degree; The acquiring the temperature adjustment amplitude of each subsequence according to the running time of each subsequence, the overall value of the ambient temperature and the overall influence degree specifically includes: Normalizing the product of the running time of each subsequence, the overall value of the ambient temperature and the overall impact degree to obtain a temperature adjustment amplitude of each subsequence; The temperature adjustment amplitude of each subsequence is expressed as: In the formula, is the temperature adjustment amplitude of the kth subsequence in the pavement temperature sequence; M is the total number of analyzed subsequences in the pavement temperature sequence; is the compaction anomaly of the mth analysis subsequence in the pavement temperature sequence; is the compaction anomaly of the m-1th analysis subsequence in the pavement temperature sequence; is the running time of the kth subsequence in the road surface temperature sequence; is the overall value of the ambient temperature of the kth subsequence in the road surface temperature sequence; is the overall impact; is the absolute value function; tanh is the hyperbolic tangent function; The step of selecting and transmitting the road surface temperature difference data in the modified road surface temperature sequence according to the compaction anomaly degree of each modified subsequence specifically includes: According to the preset screening interval of each correction subsequence and the compaction abnormality, a standard screening interval of each correction subsequence is obtained; Using the standard screening interval to screen the road surface temperature difference data in each correction subsequence, and transmitting the screened road surface temperature difference data; The step of obtaining the standard screening interval of each corrected subsequence specifically includes: Performing negative correlation mapping and normalization processing on the compaction anomaly degree of each corrected subsequence, and performing rounding operation on the product of the processing result and the preset screening interval to obtain a standard screening interval for each corrected subsequence; Transmit the screened road surface temperature difference data, including: Run-length encoding is used to compress the screened road surface temperature difference data, and the compressed data is sent to the server through the WebSocket communication protocol; an application programming interface is created on the server side to receive the compressed data.

2. A method for securely transmitting asphalt mixture compaction monitoring data according to claim 1, characterized in that: The method of using the temperature adjustment amplitude to correct the road surface temperature difference data in each subsequence to obtain a corrected road surface temperature sequence specifically includes: The sum of the temperature adjustment amplitude and the constant 1 is used as the temperature correction coefficient of each subsequence; each road surface temperature difference data in each subsequence is weighted by the temperature correction coefficient to obtain the corrected temperature difference data corresponding to each road surface temperature difference data in each subsequence; Each road surface temperature difference data in the road surface temperature sequence is updated to the corresponding corrected temperature difference data, and the updated road surface temperature sequence is used as the corrected road surface temperature sequence.

3. The method for securely transmitting asphalt mixture compaction monitoring data according to claim 1, characterized in that: The dividing the road surface temperature sequence into different subsequences specifically includes: The extreme value of the road surface temperature difference data in the road surface temperature sequence is obtained; in the road surface temperature sequence, the road surface temperature difference data between two adjacent extreme values ​​constitute a subsequence.

4. A method for securely transmitting asphalt mixture compaction monitoring data according to claim 1, characterized in that: The temperature dispersion index of each subsequence is the extreme difference of the road surface temperature difference data in the corresponding subsequence.

5. A system for secure transmission of asphalt mixture compaction monitoring data, characterized in that: The system includes: A data acquisition module is used to obtain a road surface temperature sequence consisting of road surface temperature difference data at each moment in a set time period of the road section to be compacted; An abnormality analysis module is used to divide the road surface temperature sequence into different subsequences; and obtain the compaction abnormality of each subsequence according to the discrete degree of the road surface temperature difference data and the road surface temperature difference data in each subsequence; The temperature adjustment module is used to obtain the temperature adjustment amplitude of each subsequence according to the difference between the compaction anomalies of different subsequences, the position of each subsequence in the road surface temperature sequence, and the ambient temperature data at the corresponding moment of the road surface temperature difference data in each subsequence; and to correct the road surface temperature difference data in each subsequence using the temperature adjustment amplitude to obtain a corrected road surface temperature sequence; A data transmission module, used for dividing the modified pavement temperature sequence into different modified subsequences; screening the pavement temperature difference data in the modified pavement temperature sequence according to the compaction anomaly of each modified subsequence for transmission; The obtaining of the compaction abnormality of each subsequence specifically includes: The cumulative sum of all road surface temperature difference data in each subsequence is used as the overall temperature difference index of each subsequence; the temperature dispersion index of each subsequence is obtained according to the road surface temperature difference data in each subsequence; Obtaining the compaction anomaly degree of each subsequence according to the overall temperature difference index and the temperature dispersion index; The compaction anomaly of each subsequence is expressed as: Where Q is the compaction anomaly of each subsequence; N is the total number of pavement temperature difference data in each subsequence; The nth road surface temperature difference data in each subsequence; is the maximum value of all road surface temperature difference data in each subsequence; The minimum value of all road surface temperature difference data in each subsequence; is the overall temperature difference index for each subsequence; is the temperature discrete index of each subsequence; Norm is the normalization function; The obtaining of the temperature adjustment amplitude of each subsequence specifically includes: Selecting an analysis subsequence from the subsequences according to the compaction abnormality; for all analysis subsequences, taking the average of the difference between the compaction abnormality of each analysis subsequence and the next adjacent analysis subsequence as the overall influence; The difference between the time corresponding to the first road surface temperature difference data in each subsequence and the time corresponding to the first road surface temperature difference data in the road surface temperature sequence is taken as the running time of each subsequence; the average of the ambient temperature data at the time corresponding to all road surface temperature difference data in each subsequence is taken as the overall ambient temperature value of each subsequence; Obtaining a temperature adjustment amplitude for each subsequence according to the running time of each subsequence, the overall value of the ambient temperature, and the overall impact degree; The acquiring the temperature adjustment amplitude of each subsequence according to the running time of each subsequence, the overall value of the ambient temperature and the overall influence degree specifically includes: Normalizing the product of the running time of each subsequence, the overall value of the ambient temperature and the overall impact degree to obtain a temperature adjustment amplitude of each subsequence; The temperature adjustment amplitude of each subsequence is expressed as: In the formula, is the temperature adjustment amplitude of the kth subsequence in the pavement temperature sequence; M is the total number of analyzed subsequences in the pavement temperature sequence; is the compaction anomaly of the mth analysis subsequence in the pavement temperature sequence; is the compaction anomaly of the m-1th analysis subsequence in the pavement temperature sequence; is the running time of the kth subsequence in the road surface temperature sequence; is the overall value of the ambient temperature of the kth subsequence in the road surface temperature sequence; is the overall impact; is the absolute value function; tanh is the hyperbolic tangent function; The step of selecting and transmitting the road surface temperature difference data in the modified road surface temperature sequence according to the compaction anomaly degree of each modified subsequence specifically includes: According to the preset screening interval of each correction subsequence and the compaction abnormality, a standard screening interval of each correction subsequence is obtained; Using the standard screening interval to screen the road surface temperature difference data in each correction subsequence, and transmitting the screened road surface temperature difference data; The step of obtaining the standard screening interval of each corrected subsequence specifically includes: Performing negative correlation mapping and normalization processing on the compaction anomaly degree of each corrected subsequence, and performing rounding operation on the product of the processing result and the preset screening interval to obtain a standard screening interval for each corrected subsequence; Transmit the screened road surface temperature difference data, including: Run-length encoding is used to compress the screened road surface temperature difference data, and the compressed data is sent to the server through the WebSocket communication protocol; an application programming interface is created on the server side to receive the compressed data.

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