CN113516323A - Transportation path recommendation method - Google Patents
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Abstract
The invention provides a transportation path recommendation method, which belongs to the technical field of hazardous chemical transportation and comprises the following steps: determining a plurality of transportation paths meeting transportation information based on the transportation information related to the transportation of the hazardous chemical by the transportation vehicle; for each target transport path of the plurality of transport paths, performing: dividing a target transportation path into a plurality of transportation road sections; evaluating a risk index of the transport vehicle on each transport section; determining a total risk index corresponding to the target transportation path according to the risk index of the transportation vehicle on each transportation section; and selecting a recommended transportation path from the plurality of transportation paths according to the total risk index corresponding to each target transportation path. According to the scheme, the evaluation accuracy rate of the risk index on the transportation path can be improved, and the risk index is used as an influence factor of dangerous chemical transportation, so that the accuracy rate of the transportation path recommendation result can be improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of dangerous chemical transportation, in particular to a transportation path recommendation method.
Background
Urban logistics is an important foundation for existence and development of modern cities, is support and guarantee for life and work of urban residents, and plays an important role in urban development. The Vehicle Routing distribution (VRP) Problem is closely related to logistics distribution, and transportation is performed on the optimal transportation path, so that the effects of saving cost, reducing transportation risk and the like can be achieved.
Hazardous Material transport (HAZMAT) is an important branch of the logistics Transportation path optimization problem for vehicles. The traditional path recommendation method only considers a single factor of transportation time or transportation distance, cannot consider the influence factors of dangerous chemical transportation, and has huge harm cost once an accident occurs. Therefore, a transportation path recommendation method for dangerous chemical transportation needs to be provided.
Disclosure of Invention
The embodiment of the invention provides a transportation path recommendation method, which aims to improve the accuracy of a transportation path recommendation result.
The embodiment of the invention provides a transportation path recommendation method, which comprises the following steps:
determining a plurality of transportation paths meeting transportation information based on the transportation information related to the transportation of the hazardous chemical substances by the transportation vehicle; the transportation information at least comprises a departure time, a latest arrival time, a departure position and an arrival position;
for each target transport path of the plurality of transport paths, performing:
dividing the target transportation path into a plurality of transportation sections;
evaluating a risk index of the transport vehicle on each transport section;
determining a total risk index corresponding to the target transportation path according to the risk index of the transportation vehicle on each transportation section;
and selecting a recommended transportation path from the plurality of transportation paths according to the total risk index corresponding to each target transportation path.
Preferably, the dividing the target transportation path into a plurality of transportation sections includes:
dividing the target transportation path into a plurality of transportation road sections according to unit length; each transport section is equal in length and equal to the unit length.
Preferably, the unit length is no greater than r; and r is used for representing the radiation radius of the transport vehicle when a dangerous chemical accident occurs.
Preferably, said assessing a risk index for said transportation vehicle on each transportation section comprises:
for each target transport section of the plurality of transport sections, performing:
predicting the corresponding transportation time of the transportation vehicle on the target transportation road section according to the departure time;
and determining a risk index corresponding to the target transportation section at the transportation moment.
Preferably, the determining the risk index corresponding to the target transportation section at the transportation time includes:
determining the accident rate of the target transportation section corresponding to the transportation time;
determining an accident influence index caused by dangerous chemical accidents occurring on the target transportation section at the transportation moment;
and calculating a risk index corresponding to the target transportation section at the transportation moment according to the accident occurrence rate and the accident influence index.
Preferably, the determining the accident rate of the target transportation section corresponding to the transportation time includes:
determining a first probability of dangerous chemical accidents occurring on the target transportation road section;
determining a second probability of a traffic accident occurring at the transportation moment of the target transportation section;
calculating the accident rate based on the first probability and the second probability.
Preferably, the determining the first probability of the hazardous chemical accident occurring on the target transportation section comprises:
determining a first probability of a hazardous chemical accident occurring on the target transportation section by using the following formula:
wherein,
is the first probability;
the using time of the container for containing the hazardous chemical substances for the transport vehicle is long, and the unit is days;
the total number of dangerous chemical accidents occurring in 365 days all the year round;
the average service life of a container for containing the hazardous chemical substances on a transport vehicle with the occurrence of the hazardous chemical substance accidents within 365 days all the year is long, and the unit is the number of days.
Preferably, the determining the first probability of the hazardous chemical accident occurring on the target transportation section comprises:
determining a first probability of a hazardous chemical accident occurring on the target transportation section by using the following formula:
wherein,
is the first probability;
the probability of occurrence of the i-th-grade dangerous chemical accident;
the using time of the container for containing the hazardous chemical substances for the transport vehicle is long, and the unit is days;
the total number of dangerous chemical accidents of the ith grade occurring in 365 days all year round;
the average service life of the containers for containing the dangerous chemicals on the transport vehicles with the i-th-grade dangerous chemical accident within 365 days all the year is long, and the unit is the number of days; q is the highest grade of dangerous chemical accidents, and q is an integer not less than 1.
Preferably, the determining an accident influence index caused by the occurrence of the hazardous chemical accident in the target transportation section at the transportation time includes:
determining the radiation radius of the transport vehicle when a dangerous chemical accident occurs;
determining the population density corresponding to the set point on the target transportation section as the center of a circle and the radius of the radiation as the radius at the transportation moment;
determining the population density as the accident impact index.
Calculating a risk index corresponding to the target transportation section at the transportation moment according to the accident occurrence rate and the accident influence index, wherein the risk index comprises the following steps:
calculating the risk index corresponding to the target transportation section at the transportation moment by using the following formula:
wherein R is a risk index corresponding to the target transportation section at the transportation moment t;
as a function of the number of the coefficients,
in order to be said first probability,
in order to be said second probability that the second probability,
and an accident influence index brought by dangerous chemical accidents occurring at the transport time t on the target transport road section.
Preferably, before the determining the total risk index corresponding to the target transportation path, the method further includes:
determining whether a sensitive object is included on each of the transport sections; if so, correcting the risk index on the transportation road section according to the type of the sensitive target; and executing the total risk index corresponding to the determined target transportation path by using the corrected risk index on each transportation section.
Preferably, the modifying the risk index on the transportation section according to the type of the sensitive object includes:
the risk index on the transport section is corrected using the following formula:
wherein R is the risk index on the transportation section after correction;
as a function of the number of the coefficients,
the probability of occurrence of the i-th-grade dangerous chemical accident;
an accident influence index caused by the occurrence of dangerous chemical accidents of the ith grade at the transport time t on the target transport section,
is the risk value of the jth sensitive target when the ith-grade dangerous chemical substance accident occurs, and q is the dangerous chemical substance accidentSo, and q is an integer not less than 1;
is the second probability.
The embodiment of the invention provides a transportation path recommendation method, wherein dangerous chemicals are transported at a certain risk, so that the risk needs to be considered as an influence factor when a transportation path is recommended, the risk can be represented by a risk index, the risk indexes are different in different transportation road sections on the transportation path due to different road surface conditions of the different transportation road sections, the evaluation accuracy of the risk index on the transportation path can be improved by evaluating the risk indexes on the different transportation road sections, and the accuracy of a transportation path recommendation result can be improved by using the risk index as the influence factor of the dangerous chemicals transportation.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a transportation path recommendation method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a transportation network according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As described above, the conventional transportation route recommendation method considers only a single factor of the transportation time or the transportation distance, and then selects a transportation route having the minimum transportation time or the minimum transportation distance. However, the dangerous chemicals have different factors due to their own characteristics of flammability, explosiveness, toxicity, etc. Because dangerous chemicals have potential harm, consequently, dangerous chemicals transport vehicle is as a mobile danger source, in case of the accident, not only can nearby regional vehicle and personnel receive the damage, secondary accident that leads to by the explosion of dangerous chemicals, reveal, catch fire and diffusion will probably cause more serious consequence. Therefore, risk factors need to be taken into account when making recommendations for hazardous chemical transport routes.
Specific implementations of the above concepts are described below.
Referring to fig. 1, an embodiment of the present invention provides a transportation route recommendation method, including:
And 104, selecting a recommended transportation path from the multiple transportation paths according to the total risk index corresponding to each target transportation path.
In the embodiment of the invention, a certain risk exists in dangerous chemical transportation, so that the risk needs to be considered as an influence factor when a transportation path is recommended, the risk can be represented by a risk index, the risk indexes are different in different transportation road sections on the transportation path due to different road surface conditions of the different transportation road sections, the evaluation accuracy of the risk index on the transportation path can be improved by evaluating the risk indexes on the different transportation road sections, and the accuracy of the transportation path recommendation result can be improved by using the risk index as the influence factor of the dangerous chemical transportation.
The manner in which the various steps shown in fig. 1 are performed is described below.
Firstly, aiming at step 100, determining a plurality of transportation paths meeting transportation information based on the transportation information related to the transportation of hazardous chemical substances by a transportation vehicle; the transportation information includes at least a departure time, a latest arrival time, a departure location, and an arrival location.
Hazardous chemicals refer to highly toxic chemicals and other chemicals which have the properties of toxicity, corrosion, explosion, combustion supporting and the like and are harmful to human bodies, facilities and the environment. The transportation path of the hazardous chemical substances needs to be planned in advance, so that transportation information needs to be determined.
The departure time is the actual departure time, and may be a certain time of a certain day, for example, 8: 00; or a certain time of the day, e.g., 10:00 on tuesday; or a certain time of day, for example, 15:00 on 8/month/1/day. Due to the transportation time cost considerations, the latest arrival time needs to be determined.
Please refer to fig. 2, which is a schematic diagram of a transportation network. Wherein, in FIG. 2
~
Respectively road intersection points, assuming departure positions of
The arrival position is
。
Due to the complexity of the transportation network, the transportation path from the departure position to the arrival position may include several, for example m, but because time cost needs to be considered, it needs to be ensured that the departure time starts from the departure position, and the arrival position needs to be no later than the latest arrival time, so the transportation path capable of meeting the time cost may be n, where n is less than or equal to m, and n and m are positive integers. Then, the n transportation paths are recorded as the transportation paths satisfying the transportation information in step 100.
Then, for step 102, for each target transportation path of the plurality of transportation paths, the following steps S1-S3 are executed:
s1: the target transportation path is divided into a plurality of transportation sections.
In one embodiment of the invention, because one transportation path is longer and the road surface conditions of different transportation sections are not completely the same, the risk indexes of the transportation sections on the transportation path are different, so that the transportation path can be divided into a plurality of transportation sections to realize the conversion of the risk assessment of the transportation path into the risk assessment of each transportation section on the transportation path, and the accuracy of the risk assessment of the transportation path can be improved by refining the analysis granularity.
When a transportation route is divided into a plurality of transportation sections, the specific division mode at least includes the following two modes:
the first mode is that the division is carried out according to the intersection points of the transportation roads.
In this first mode, the links between the intersections may be determined as the divided transportation links. For example, in FIG. 2, the transport path is taken as
For example, the divided transportation section includes:
three transport sections.
And the second mode is to divide the data according to the unit length.
In the first mode, the transportation section between the transportation road intersections may have a long distance, for example, the length of a transportation section is 5 kilometers, so that the accuracy of the risk assessment method for the transportation section is higher than that of the risk assessment result for the entire transportation route, but the accuracy of the risk assessment method is still not accurate enough. Therefore, in the second mode, the transportation path can be divided into a plurality of transportation sections according to the unit length, the length of each transportation section is equal to the unit length, and the division granularity is further refined on the basis of the first mode. The unit length may be 1 meter, 10 meters, 50 meters, or the like, or may be a transport length of one second when the transport vehicle is at a normal speed (for example, 60 Km/h).
In one embodiment of the invention, the unit length is no greater than r; and r is used for representing the radiation radius of the transport vehicle when a dangerous chemical accident occurs. When a transport vehicle has a dangerous chemical accident, the influence on personnel and environment around the accident can be caused, and the longest distance from the transport vehicle to the personnel and the environment affected by the dangerous chemical accident is determined as the radiation radius. If the length of the divided transportation road section is larger than the radiation radius, if a dangerous chemical accident occurs at the middle point of one transportation road section by the transportation vehicle, the transportation vehicle cannot radiate to the whole transportation road section, and the obtained risk assessment result cannot accurately represent the result of performing risk assessment on the transportation road section. Therefore, the length of the divided transportation road section is not more than r, when the transportation vehicle is located at any position point of two end points or the middle of the transportation road section, the transportation road section can be within the radiation radius when a dangerous chemical accident occurs, and when the risk index on the transportation road section is subsequently evaluated, the transportation road section can be used as a reference point for evaluation, so that the accuracy of risk evaluation on the transportation road section can be improved.
S2: a risk index for the transportation vehicle on each transportation segment is evaluated.
In one embodiment of the present invention, for each of a number of transport segments on a target transport path, a risk index on the target transport segment may be evaluated at least in one of the following ways:
s21: and predicting the corresponding transportation time of the transportation vehicle on the target transportation section according to the departure time.
In one embodiment of the present invention, after the departure time is determined, the traffic flow, the density of people, and the like on the transportation route at the departure time may be predicted according to the traffic flow, the density of people, and the like on the transportation route at the past time, and then the transportation time corresponding to the transportation vehicle on each transportation link may be determined according to the predicted traffic flow, the density of people, and the like.
In one embodiment of the present invention, any one of the following moments may be determined as the transportation moment corresponding to the transportation vehicle on each transportation section: the time of entering the transportation section, the time of reaching the center point of the transportation section, the time of coming out of the transportation section, and the like.
S22: and determining the risk index corresponding to the target transportation section at the transportation moment.
In one embodiment of the present invention, the risk index corresponding to the target transportation section at the transportation time may be determined at least by one of the following manners:
s221: and determining the accident rate corresponding to the target transportation section at the transportation moment.
In one embodiment of the present invention, considering that accidents occurring in vehicles transporting hazardous chemicals may occur in addition to normal traffic accidents, the accident rate can be determined at least by one of the following ways: determining a first probability of dangerous chemical accidents occurring on the target transportation road section; determining a second probability of a traffic accident occurring at the transportation moment of the target transportation section; calculating the accident rate based on the first probability and the second probability.
When the first probability of dangerous chemical accidents occurring on the target transportation road section is determined, calculation can be carried out according to the dangerous chemical accidents occurring in history, and calculation can also be carried out according to the inspection specification of a container containing dangerous chemicals on a transportation vehicle. For example, the first probability isP 1 ＝T 1 D 1 /(365T 0 )WhereinP 1 In order to be the first probability that,T 1 the duration of use of the container for the transportation vehicle for containing the hazardous chemical substances (for example, the number of days can be used as a unit of measurement),D 1 the total number of dangerous chemical accidents occurring in 365 days all year round,T 0 the average service life of a container for containing the hazardous chemical substances on a transport vehicle with the occurrence of the hazardous chemical substance accidents within 365 days all the year is long, and the unit is the number of days.
Further, considering that the hazardous chemical substance accident may include accidents such as leakage, explosion, and combustion according to different types of hazardous chemical substances, and after the type of the hazardous chemical substance is determined, the probability of the hazardous chemical substance accident occurring in different levels is different, the first probability may be further calculated by the following formula:
wherein,
to take place ofiThe probability of a hazardous chemical accident of a grade,qis the highest grade of dangerous chemical accidents,qis an integer of not less than 1. For example, the first level hazardous chemical substance accident is leakage non-toxic, the second level hazardous chemical substance accident is combustion, the third level hazardous chemical substance accident is explosion, and the fourth level hazardous chemical substance accident is leakage toxic … ….
When the second probability of the traffic accident occurring at the transportation time of the target transportation road section is determined, the probability of the traffic accident occurring at different transportation times is different because the traffic flows corresponding to different transportation times are different, and specifically, the second probability of the traffic accident occurring at the transportation time of the target transportation road section can be calculated at least in the following wayP 2 ＝H (t)D 2 /(365T 0 )WhereinH(t)for the traffic flow at the time of the transport on the target transport segment,D 2 the total number of all year round traffic accidents on the target transportation section,H 0 is averaged for the yearDaily traffic flow.
In one embodiment of the present invention, the accident rate may be calculated using the following formula:
wherein,
respectively, are coefficients.
S222: and determining an accident influence index caused by dangerous chemical accidents occurring at the transportation moment of the target transportation section.
In an embodiment of the present invention, considering that a vehicle transporting a hazardous chemical substance may affect surrounding environment, people, and the like when a hazardous chemical substance accident occurs, the population density may be determined as an accident impact coefficient, and specifically, this step S222 may be performed at least in one of the following manners: determining the radiation radius of the transport vehicle when a dangerous chemical accident occurs; determining the population density corresponding to the set point on the target transportation section as the center of a circle and the radius of the radiation as the radius at the transportation moment; determining the population density as the accident impact index.
When the radiation radius of the transportation vehicle in the dangerous chemical accident is determined, the radiation radius can be determined at least in one mode of the following modes: determining the radiation radius of dangerous chemical accidents when the transport vehicle is fully loaded; determining the current loading capacity of the transport vehicle; and determining the radiation radius of the transport vehicle when the dangerous chemical substance accident occurs according to the current loading capacity and the radiation radius of the dangerous chemical substance accident when the transport vehicle is fully loaded.
In an embodiment of the present invention, it is considered that the hazardous chemical accident may include accidents such as leakage, explosion, and combustion according to different types of hazardous chemical, and after the type of the hazardous chemical is determined, the radiation radii corresponding to different levels of hazardous chemical accidents are also different. Since the population density is also constantly changing at different transportation times, the population density within the radius of the radiation at the transportation time can be predicted. The population density within the radius of radiation at the time of transport can be calculated from the population density at the radius of radiation at the historical time. The population density can be determined by infrared temperature measurement, such as infrared area within the radiation radius, infrared thermal radiation value within the radiation radius, or by demographic statistics.
S223: and calculating a risk index corresponding to the target transportation section at the transportation moment according to the accident occurrence rate and the accident influence index.
In one embodiment of the present invention, the product of the accident rate and the accident influence index may be determined as the risk index corresponding to the target transportation section at the transportation time.
Considering that the accident impact index is mainly caused by a hazardous chemical accident, the risk index corresponding to the target transportation section at the transportation time may be:
wherein
and an accident influence index brought by dangerous chemical accidents occurring at the transportation moment on the target transportation road section. The accident influence index is mainly caused by dangerous chemical accidents, so that the dangerous chemical accidents are multiplied by the accident influence index, and then the sum of the accident influence index and the occurrence probability of the traffic accidents is determined as the risk index, and the accuracy of determining the risk index can be further improved.
If different levels of dangerous chemical accidents are considered, the risk index corresponding to the target transportation section at the transportation moment can be as follows:
wherein,
for the target transportation section to take placeiAnd (4) accident influence indexes corresponding to the transportation time when the classified dangerous chemicals are in accidents. The radiation radius is different when the different grades of dangerous chemical accidents are considered by using the formula, so the accident influence indexes are different, and further the accident influence indexes are calculatedThe difference in risk indices, and therefore, the accuracy of risk index determination can be further improved using this formula.
It should be noted that, in addition to the above-mentioned manner of determining the risk index, the risk index of the target transportation section may be determined by other manners, such as using only the traffic accident occurrence rate as the accident occurrence rate, performing calculation by using the average population density, and the like.
In addition, the factor of transportation time is used when the risk index on the transportation section is evaluated is considered, if the transportation section is longer, the longer the transportation vehicle runs on the transportation section, the traffic flow, the population density and the like in the time length can be changed, and therefore the accuracy of the calculated risk index can be reduced, and therefore the transportation path is divided according to the unit length, so that the transportation section is kept in a smaller length range, and the calculation accuracy of the risk index can be improved.
Further, if the radiation radii corresponding to different levels of dangerous chemical accidents are considered to be different, the length of the divided transportation section may not be greater than the minimum radiation radius.
S3: and determining a total risk index corresponding to the target transportation path according to the risk index of the transportation vehicle on each transportation section.
In one embodiment of the present invention, the total risk index corresponding to the target transportation path is equal to the sum of the risk indexes on each transportation section on the target transportation path.
In an embodiment of the present invention, in order to further improve the accuracy of the total risk index on the transportation path, before the step S3, the method may further include: determining whether a sensitive object is included on each of the transport sections; if so, correcting the risk index on the transportation road section according to the type of the sensitive target; and executing the total risk index corresponding to the determined target transportation path by using the corrected risk index on each transportation section.
The sensitive targets may include schools, shopping malls, office buildings, gas stations, etc., and if the transportation road section includes the sensitive targets, the risk index on the transportation road section may be modified by using the types of the sensitive targets in consideration of higher risk caused by the sensitive targets. It should be noted that the sensitive object included in the transportation section means that the sensitive object is included in the radiation radius of the transportation section.
When the risk index on the transportation section is corrected, the risk index can be corrected at least in the following ways:
for example, the first method: the following formula is used for correction:
wherein R is the corrected risk index, R0For risk indices before correction, XjThe risk value of the jth sensitive target.
For example, the method two: the following formula is used for correction:
wherein R is the risk index on the transportation section after correction;
as a function of the number of the coefficients,
the probability of occurrence of the i-th-grade dangerous chemical accident;
an accident influence index caused by the occurrence of dangerous chemical accidents of the ith grade at the transport time t on the target transport section,
is the risk value of the jth sensitive target when the ith grade of dangerous chemical substance accident occurs, q is the highest grade of the dangerous chemical substance accident, andq is an integer of not less than 1;
is the second probability. Assuming that when an ith-grade hazardous chemical accident occurs, the radiation radius is r ', then 2 sensitive targets are included within the radiation radius r', then j =1, 2. In this way, the accuracy of the determination of the risk index can be further improved.
In an embodiment of the present invention, for the calculation manner of the risk value of the sensitive target, a corresponding risk value may be preset according to the type of the sensitive target, for example, when the sensitive target is a school, the risk value is F1; when the sensitive target is a mall, the risk value is F2; when the sensitive target is an office building, the risk value is F3; the risk value is F4 when the sensitive target is a gasoline station. It is understood that the corresponding risk values for different levels of hazardous chemical accidents may be preset depending on the type of sensitive target. The product of the number of persons within the sensitive object and the set coefficient may also be determined as the corresponding risk value.
And finally, aiming at step 104, selecting a recommended transportation path from the multiple transportation paths according to the total risk index corresponding to each target transportation path.
In one embodiment of the invention, the transportation path with the smallest total risk index may be determined as the recommended transportation path.
Since the transportation cost also needs to be considered when the transportation path is recommended, in an embodiment of the present invention, the transportation cost of each transportation path may be calculated, where the transportation cost may be calculated by the total transportation distance and the total transportation duration, and then a transportation path where the total risk index and the transportation cost are balanced is determined according to the transportation cost and the total risk index, and is determined as the recommended transportation path. The recommended transportation path is determined, for example, by the following formula:
wherein
is as follows
The overall risk index of the strip transport path,
is as follows
And determining the transportation cost of the transportation path, and determining the transportation path with the minimum Z as the recommended transportation path.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A method for recommending a transportation route, comprising:
determining a plurality of transportation paths meeting transportation information based on the transportation information related to the transportation of the hazardous chemical substances by the transportation vehicle; the transportation information at least comprises a departure time, a latest arrival time, a departure position and an arrival position;
for each target transport path of the plurality of transport paths, performing:
dividing the target transportation path into a plurality of transportation sections;
evaluating a risk index of the transport vehicle on each transport section;
determining a total risk index corresponding to the target transportation path according to the risk index of the transportation vehicle on each transportation section;
selecting a recommended transportation path from the multiple transportation paths according to the total risk index corresponding to each target transportation path;
the assessing a risk index for the transportation vehicle on each transportation segment includes:
for each target transport section of the plurality of transport sections, performing:
predicting the corresponding transportation time of the transportation vehicle on the target transportation road section according to the departure time;
and determining a risk index corresponding to the target transportation section at the transportation moment.
2. The method of claim 1, wherein the dividing the target transportation path into a number of transportation segments comprises:
dividing the target transportation path into a plurality of transportation road sections according to unit length; each transport section is equal in length and equal to the unit length.
3. The method of claim 2, wherein the unit length is no greater than r; and r is used for representing the radiation radius of the transport vehicle when a dangerous chemical accident occurs.
4. The method of claim 1, wherein the determining the risk index corresponding to the target transportation segment at the transportation time comprises:
determining the accident rate of the target transportation section corresponding to the transportation time;
determining an accident influence index caused by dangerous chemical accidents occurring on the target transportation section at the transportation moment;
and calculating a risk index corresponding to the target transportation section at the transportation moment according to the accident occurrence rate and the accident influence index.
5. The method of claim 4, wherein the determining the accident rate corresponding to the target transportation segment at the transportation time comprises:
determining a first probability of dangerous chemical accidents occurring on the target transportation road section;
determining a second probability of a traffic accident occurring at the transportation moment of the target transportation section;
calculating the accident rate based on the first probability and the second probability.
6. The method of claim 5, wherein the determining the first probability of the target transportation segment experiencing a hazardous chemical accident comprises:
determining a first probability of a hazardous chemical accident occurring on the target transportation section by using the following formula:
wherein,
is the first probability;
the using time of the container for containing the hazardous chemical substances for the transport vehicle is long, and the unit is days;
the total number of dangerous chemical accidents occurring in 365 days all the year round;
the average service life of a container for containing the hazardous chemical substances on a transport vehicle with the occurrence of the hazardous chemical substance accidents within 365 days all the year is long, and the unit is the number of days.
7. The method of claim 5, wherein the determining the first probability of the target transportation segment experiencing a hazardous chemical accident comprises:
determining a first probability of a hazardous chemical accident occurring on the target transportation section by using the following formula:
wherein, P1Is the first probability;
the probability of occurrence of the i-th-grade dangerous chemical accident; t is1The using time of the container for containing the hazardous chemical substances for the transport vehicle is long, and the unit is days;
the total number of dangerous chemical accidents of the ith grade occurring in 365 days all year round;
the average service life of the containers for containing the dangerous chemicals on the transport vehicles with the i-th-grade dangerous chemical accident within 365 days all the year is long, and the unit is the number of days; q is the highest grade of dangerous chemical accidents, and q is an integer not less than 1.
8. The method of claim 4, wherein the determining the accident impact index caused by the dangerous chemical accident occurring on the target transportation section at the transportation moment comprises:
determining the radiation radius of the transport vehicle when a dangerous chemical accident occurs;
determining the population density corresponding to the set point on the target transportation section as the center of a circle and the radius of the radiation as the radius at the transportation moment;
determining the population density as the accident impact index.
9. The method according to claim 5, wherein calculating the risk index corresponding to the target transportation section at the transportation moment according to the accident occurrence rate and the accident influence index comprises:
calculating the risk index corresponding to the target transportation section at the transportation moment by using the following formula:
wherein R is a risk index corresponding to the target transportation section at the transportation moment t;
as a function of the number of the coefficients,
in order to be said first probability,
in order to be said second probability that the second probability,
and an accident influence index brought by dangerous chemical accidents occurring at the transport time t on the target transport road section.
10. The method of claim 5, further comprising, prior to said determining a total risk index corresponding to said target transportation path:
determining whether a sensitive object is included on each of the transport sections; if so, correcting the risk index on the transportation road section according to the type of the sensitive target; and executing the total risk index corresponding to the determined target transportation path by using the corrected risk index on each transportation section.
11. The method of claim 10, wherein modifying the risk index on the transportation segment according to the type of the sensitive object comprises:
the risk index on the transport section is corrected using the following formula:
wherein R is the risk index on the transportation section after correction;
as a function of the number of the coefficients,
probability of dangerous chemical accident of i-th grade；
An accident influence index caused by the occurrence of dangerous chemical accidents of the ith grade at the transport time t on the target transport section,
the risk value of the jth sensitive target when the ith-grade dangerous chemical substance accident occurs is q, the highest grade of the dangerous chemical substance accident is q, and q is an integer not less than 1;
is the second probability.
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