Tunnel fan control strategy adjusting method and system based on balanced wear

Abstract

The invention discloses an in-tunnel fan control strategy adjusting method and system based on balanced wear, and relates to the field of tunnel fan control, and the method comprises the steps: obtaining the CO concentration, VI visibility and traffic state in a tunnel; according to the CO concentration, the VI visibility and the traffic state, a fan control strategy is formulated based on a balanced wear scheme; and controlling the fans in the area to operate according to the fan control strategy. The ventilation strategy and the fan operation state can be flexibly adjusted according to the CO concentration, the VI visibility and the traffic state in the tunnel, and the ventilation efficiency in the tunnel is improved while the safety of the tunnel environment is ensured; the fan control strategy is determined through the wear balancing scheme, the running time of the fans can be accurately monitored and reasonably distributed, the fans are prevented from being excessively worn due to long-time continuous running, the running sequence and duration of the fans are adjusted regularly or according to actual requirements, it is ensured that all the fans are evenly worn, and the service life of the fans is prolonged.

Description

Technical Field

[0001] The present application relates to the field of tunnel fan control, and particularly to a method and system for adjusting a tunnel fan control strategy based on balanced wear. Background Art

[0002] As a key transportation infrastructure, the maintenance of the internal environment of a tunnel is crucial for ensuring traffic safety, improving traffic efficiency, and protecting the health of tunnel users. The tunnel ventilation system plays a core role here, aiming to control the fans to supply clean breathing air into the tunnel and ensure good visual conditions in the tunnel air polluted by exhaust gas and dust.

[0003] The current tunnel ventilation systems often cannot be dynamically adjusted in combination with the internal environment in the tunnel, and there are problems such as low ventilation efficiency, large energy consumption, and uneven fan wear. As a key component of the ventilation system, the stability and durability of the fan's operating state are directly related to the ventilation effect and the overall performance of the system. During long-term high-load operation, the fans may experience uneven wear, resulting in some fans failing prematurely, increasing the maintenance cost and the risk of system shutdown. Summary of the Invention

[0004] The purpose of the present application is to provide a method and system for adjusting a tunnel fan control strategy based on balanced wear. The present application can flexibly adjust the ventilation strategy of the tunnel fan and the operating state of the fan, improve the ventilation efficiency in the tunnel while ensuring the safety of the tunnel environment; it can accurately monitor and reasonably allocate the operating time of the fans to ensure uniform wear of all fans and extend the service life of the fans.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] In a first aspect, the present application provides a method for adjusting a tunnel fan control strategy based on balanced wear. The control area of the tunnel includes multiple fan groups, each fan group includes multiple fan sections, and each fan section is provided with multiple fans. The method for adjusting the tunnel fan control strategy based on balanced wear is characterized in that it includes:

[0007] Obtain the CO concentration, VI visibility, and traffic state in the tunnel; the traffic state includes: unobstructed state, slow-moving state, congested state, maintenance state, and closed state;

[0008] Based on the CO concentration, VI visibility, and traffic state, formulate a fan control strategy based on a balanced wear plan; the fan control strategy is: a first control strategy or a second control strategy;

[0009] Control the operation of the fans in the control area according to the fan control strategy.

[0010] In a second aspect, the present application provides a computer system, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method for adjusting the tunnel fan control strategy based on balanced wear described in any one of the above.

[0011] According to the specific embodiments provided by the present application, the following technical effects are disclosed in the present application:

[0012] The present application can flexibly adjust the ventilation strategy and the fan operation state according to the CO concentration, VI visibility, and traffic state inside the tunnel, improving the ventilation efficiency inside the tunnel while ensuring the safety of the tunnel environment; by determining the fan control strategy through the balanced wear scheme, the fan operation time can be accurately monitored and reasonably allocated, avoiding excessive wear of the fan due to long-term continuous operation, and ensuring uniform wear of all fans and extending the service life of the fan by regularly or adjusting the operation sequence and duration of the fan according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic flowchart of a method for adjusting the tunnel fan control strategy based on balanced wear provided by an embodiment of the present application.

[0015] Figure 2 It is a schematic flowchart of the fan operation mode switching provided by an embodiment of the present application.

[0016] Figure 3 It is a schematic flowchart of the fan control strategy provided by an embodiment of the present application.

[0017] Figure 4 It is a schematic flowchart of the balanced wear scheme of the fan control method provided by an embodiment of the present application.

[0018] Figure 5 It is a schematic structural diagram of a computer system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0020] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Embodiment 1, as Figure 1 shown, this embodiment provides a method for adjusting the control strategy of tunnel fans based on balanced wear. The control area of the tunnel includes multiple fan groups, each fan group includes multiple fan sections, and each fan section is provided with multiple fans. The method for adjusting the control strategy of tunnel fans based on balanced wear includes:

[0022] S1. Obtain the CO concentration, VI visibility, and traffic status in the tunnel; the traffic status includes: unobstructed status, slow-moving status, congested status, maintenance status, and closed status.

[0023] Further, the traffic status is specifically as follows:

[0024] 1) The unobstructed status is the status when there are social vehicles in the tunnel, and there are no maintenance vehicles, and the traffic flow speed range is greater than or equal to 50 km / h.

[0025] 2) The slow-moving status is the status when there are social vehicles in the tunnel, and there are no maintenance vehicles, and the traffic flow speed range is greater than or equal to 30 km / h and less than 50 km / h.

[0026] 3) The congested status is the status when there are social vehicles in the tunnel, and there are no maintenance vehicles, and the traffic flow speed range is greater than or equal to 10 km / h and less than 30 km / h.

[0027] 4) The maintenance status is the status when there are no social vehicles in the tunnel and there are maintenance vehicles.

[0028] 5) The closed status is the status when there are no social vehicles in the tunnel and there are no maintenance vehicles.

[0029] Optionally, the social vehicle is a vehicle that enters the tunnel for the purpose of passing through the tunnel; the maintenance vehicle is a vehicle that enters the tunnel for the purpose of performing maintenance operations on the tunnel.

[0030] S2. Based on the CO concentration, VI visibility, and traffic conditions, formulate a fan control strategy based on the balanced wear scheme; the fan control strategy is: the first control strategy or the second control strategy.

[0031] Further, step S2 specifically includes:

[0032] When the traffic condition is smooth, determine whether the CO concentration is less than 100 mg / m 3 and whether the VI visibility is less than 5 m. If so, execute the second control strategy; if not, execute the first control strategy.

[0033] When the traffic condition is slow, determine whether the CO concentration is less than 150 mg / m 3 and whether the VI visibility is less than 9 m. If so, execute the second control strategy; if not, execute the first control strategy.

[0034] When the traffic condition is congested, determine whether the CO concentration is less than 100 mg / m 3 and whether the VI visibility is less than 7 m. If so, execute the second control strategy; if not, execute the first control strategy.

[0035] When the traffic condition is in maintenance, determine whether the CO concentration is less than 30 mg / m 3 and whether the VI visibility is less than 3 m. If so, execute the second control strategy; if not, execute the first control strategy.

[0036] When the traffic condition is closed, determine whether the CO concentration is less than 250 mg / m 3 and whether the VI visibility is less than 12 m. If so, execute the second control strategy; if not, execute the first control strategy.

[0037] Further, as Figure 3 shown, the process of the first control strategy is as follows:

[0038] When the CO concentration deceleration duration is lower than the preset CO concentration deceleration duration and the VI visibility deceleration duration is lower than the preset VI visibility deceleration duration, no fan adjustment is performed; otherwise, proceed to the next step; the CO concentration deceleration duration is the time required to reduce the CO concentration in the tunnel to the first CO concentration threshold with the current operating state of the fans in the area; the VI visibility deceleration duration is the time required to reduce the VI visibility in the tunnel to the first VI visibility threshold with the current operating state of the fans in the area;

[0039] Obtain the wind speed and wind direction in the tunnel.

[0040] Judge whether the wind speed is within the preset wind speed range. If so, proceed to the next step. If not, obtain the wind speed within the preset wind speed range at the air vents within the preset space range in the tunnel, update the wind speed in the tunnel, and proceed to the next step.

[0041] Judge whether the wind speed is greater than or equal to 10 m / s. If so, do not adjust the fan. If not, proceed to the next step;

[0042] Judge whether all the fans within the control area are started. If so, do not adjust the fans. If not, select a cross-section with the lowest fan opening rate along the direction of the wind.

[0043] At the cross-section with the lowest fan opening rate, select the target fan according to the equal wear scheme.

[0044] Select the direction same as the wind direction as the air outlet direction of the target fan and prepare to start the target fan.

[0045] Furthermore, as Figure 3 shown, the process of the second control strategy is as follows:

[0046] Judge whether the CO concentration is greater than or equal to the second CO concentration threshold and less than or equal to the first CO concentration threshold, and whether the VI visibility is greater than or equal to the second VI visibility threshold and less than or equal to the first VI visibility threshold. If so, execute the equal wear scheme. If not, proceed to the next step.

[0047] Turn off an already started and normally controllable fan, select the fan with the longest cumulative start time according to the equal wear scheme, and prepare to start it.

[0048] Furthermore, the first CO concentration threshold = the second CO concentration threshold + 20 mg / m 3 ; the first VI visibility threshold = the second VI visibility threshold + 2 m.

[0049] S3. Control the operation of the fans within the control area according to the fan control strategy.

[0050] In the actual application process, the fan control strategy is formulated according to the CO concentration, VI visibility and traffic conditions in the tunnel, and different CO thresholds and VI thresholds are set according to different traffic conditions (such as smooth state, slow-moving state, congested state, maintenance state and closed state, etc.). According to the detection results of the CO concentration and VI visibility, it is judged whether to reduce the speed or enter the fan equal wear scheme. If the speed needs to be reduced but cannot be reduced below the threshold within the specified time, a specific processing flow is entered. If both the CO concentration and VI visibility are within the set range, the fan equal wear scheme is entered; otherwise, a normally controllable fan is turned off, and the fan with the longest cumulative running time is started to equalize the wear. According to the detection results of the wind speed and direction, the forward or reverse rotation of the fan is determined, and the fan is started.

[0051] Steps S1, S2 and S3 in this embodiment together constitute the ventilation mode of the tunnel fan control method. The tunnel fan control method specifically includes: fire mode, ventilation mode, twin mode, manual control mode and manual mode.

[0052] In the actual application process, such as Figure 2 shown, the switching process of the tunnel fan control method is as follows:

[0053] First step, judge whether there is a fire alarm at the current moment in the tunnel scene. If there is, enter the fire mode, and the fire warning plan is immediately started; if there is no fire alarm, enter the next step;

[0054] Second step, enter the ventilation mode. If the equal wear scheme is enabled, enter the next step after entering the equal wear scheme; if the equal wear scheme is not enabled, directly enter the next step.

[0055] Third step, fuse the instruction set, that is, collect and fuse the detection values of tunnel sensors (CO (carbon monoxide) concentration and VI (smoke) visibility detector, hereinafter referred to as COVI), detect the control mode. If it is not the twin mode, enter the monitoring mode and end this process; if it is the twin mode, detect the control method. If it is non-automatic control, enter the manual control mode. If it is automatic control, enter the next step.

[0056] Fourth step, detect the current fan control strategy, generate an instruction and send it to the front end to start counting down. If the operator executes the operation, the system sends an instruction to adjust the fan and ends this process; if the operator does not operate within a certain time limit, an instruction is automatically sent to adjust the fan and end this process; if the operator cancels the instruction, enter the manual mode and end this process.

[0057] In the actual application process, for the switching process of each mode in the tunnel fan control method, first, it is judged whether there is a fire alarm in the tunnel. If there is, it enters the fire mode. If there is no fire alarm, it enters the ventilation mode and decides the subsequent steps according to whether the equal wear scheme is enabled. The detection values of the tunnel sensors (CO concentration and VI visibility detector) are collected and fused, and the monitoring mode, manual control mode or automatic control mode is entered according to the detection control mode. In the automatic control mode, the current fan control strategy is detected, an instruction is generated and sent to the front end, and the fan is adjusted or the manual mode is entered according to the operation of the operator.

[0058] Further, a normally controllable fan is a fan with normal equipment functions, and the time difference between the opening or closing action of the fan and the current time exceeds the preset time difference. The preset time difference is 2.5 min.

[0059] Further, the equipment functions specifically include: communication function and air supply function.

[0060] Further, as Figure 4 shown, the equal wear scheme specifically includes:

[0061] Select the fans in the area whose current opening duration exceeds the duration threshold.

[0062] Obtain the cumulative operation duration of the fans in the area whose current opening duration exceeds the duration threshold.

[0063] Select the fans whose cumulative operation duration exceeds 10% of the total current opening duration of all fans as the over-standard fans.

[0064] Determine the section in the tunnel where the over-standard fans are located.

[0065] Judge whether there are unopened fans in the section in the tunnel where the over-standard fans are located. If so, switch the unopened fans. If not, switch the nearest unopened fan to the over-standard fan.

[0066] In the actual application process, by obtaining the cumulative usage duration of the section fans, fan groups and fans in the area, the fans and sections with the shortest normal controllable duration are determined. Obtain all the fans that have been opened and whose cumulative operation duration exceeds 20 minutes, and judge whether their opening duration exceeds 10% of the cumulative average opening duration of all fans. If there are over-standard fans, fan switching is performed according to the position information and the fan group situation in the control area to balance wear.

[0067] The technical effects of this application are as follows:

[0068] First, the ventilation efficiency is improved: By adopting a combined mode of jet fans and axial fans, the jet effect generated by the jet fans is used to guide the air flow in the tunnel, improving the ventilation effect; the axial fans are responsible for exhausting the waste gas and blowing fresh air into the tunnel. Through the sectional longitudinal ventilation design and the combined use of fans, the ventilation efficiency inside the tunnel is improved, effectively removing pollutants such as waste gas and dust, and ensuring the freshness of the air and good visual conditions inside the tunnel.

[0069] Second, the energy consumption is reduced: This application can flexibly adjust the operating state of the fans according to the actual situation inside the tunnel, avoiding unnecessary energy consumption waste and reducing the operating cost.

[0070] Third, the service life of the fans is extended: By using the equal wear algorithm, through the precise monitoring and reasonable allocation of the operating time of the fans, it is avoided that some fans are over-worn due to long-term continuous operation. The operating sequence and duration of the fans can be adjusted regularly or according to actual needs to ensure that all fans are evenly worn, extending the overall service life. The application of the equal wear scheme can ensure that all fans are evenly worn, avoid the premature failure of some fans due to excessive wear, extend the overall service life, and reduce the maintenance cost.

[0071] Fourth, the driving safety is improved. The computer program of the tunnel monitoring and management center collects the traffic volume, the status and information of the CO / VI / NO detectors and the fans, and through operation and processing, realizes the combination of real-time control and sequential control of the fans. This intelligent control system can automatically adjust the operating state of the fans according to factors such as the air quality and traffic volume inside the tunnel, ensuring the stability and safety of the internal environment of the tunnel. By optimizing the internal environment control of the tunnel, the driving safety is improved, and traffic accidents caused by poor air quality or poor visual conditions are reduced.

[0072] Fifth, the operation and maintenance management level of the tunnel is improved: This application can realize the remote monitoring and management of the tunnel ventilation system, improving the operation and maintenance management efficiency and quality.

[0073] Embodiment 2, this application also provides a computer system, which can be a server or a terminal, and its internal structure diagram can be as Figure 5As shown. The computer system includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer system is used to provide computing and control capabilities. The memory of the computer system includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer system is used for label processing data. The input / output interface of the computer system is used to exchange information between the processor and external devices. The communication interface of the computer system is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a method for adjusting a tunnel fan control strategy based on balanced wear.

[0074] Those skilled in the art can understand that Figure 5 the structure shown in is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer system to which the solution of the present application is applied. The specific computer system may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0075] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0076] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0077] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application; at the same time, for those of ordinary skill in the art, according to the ideas of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for adjusting a fan control strategy in a tunnel based on balanced wear, wherein the control area of ​​the tunnel includes a plurality of fan groups, each fan group includes a plurality of fan sections, and each fan section is provided with a plurality of fans, characterized in that: The tunnel fan control strategy adjustment method based on balanced wear includes: Obtaining CO concentration, VI visibility and traffic status in the tunnel; the traffic status includes: unobstructed state, slow-moving state, congested state, maintenance state and closed state; According to the CO concentration, VI visibility and traffic status, a fan control strategy is formulated based on a balanced wear solution; the fan control strategy is: a first control strategy or a second control strategy; Control the operation of fans in the area according to the fan control strategy.

2. The method for adjusting the control strategy of the fan in the tunnel based on balanced wear according to claim 1 is characterized in that: The unobstructed state refers to a state in which there are private vehicles in the tunnel, there are no maintenance vehicles, and the vehicle flow speed range is greater than or equal to 50 km / h; The slow-moving state refers to a state in which there are private vehicles in the tunnel, there are no maintenance vehicles, and the vehicle flow speed range is greater than or equal to 30 km / h and less than 50 km / h; The congestion state is a state where there are private vehicles in the tunnel, no maintenance vehicles, and the vehicle flow speed range is greater than or equal to 10 km / h and less than 30 km / h; The maintenance state refers to a state in which there are no private vehicles in the tunnel and there are maintenance vehicles; The maintenance status refers to a status in which there are no private vehicles and no maintenance vehicles in the tunnel.

3. The method for adjusting the control strategy of the fan in the tunnel based on balanced wear according to claim 1 is characterized in that: According to CO concentration, VI visibility and traffic conditions, a fan control strategy is formulated based on a balanced wear solution, including: When the traffic is smooth, determine whether the CO concentration is less than 100 mg / m 3 When , and , whether the VI visibility is less than 5m, if so, the second control strategy is executed, if not, the first control strategy is executed; When the traffic state is slow, determine whether the CO concentration is less than 150mg / m 3 When , and , whether the VI visibility is less than 9m, if so, the second control strategy is executed, if not, the first control strategy is executed; When the traffic is congested, determine whether the CO concentration is less than 100 mg / m 3 When , and , whether the VI visibility is less than 7m, if so, the second control strategy is executed, if not, the first control strategy is executed; When the traffic status is maintenance status, determine whether the CO concentration is less than 30mg / m 3 When , and , whether the VI visibility is less than 3m, if so, the second control strategy is executed, if not, the first control strategy is executed; When the traffic status is closed, determine whether the CO concentration is less than 250mg / m 3 When , and whether the VI visibility is less than 12m, if so, execute the second control strategy, if not, execute the first control strategy.

4. The method for adjusting the control strategy of the fan in the tunnel based on wear balancing according to claim 1 is characterized in that: The process of the first control strategy is as follows: When the CO concentration drop time is lower than the preset CO concentration drop time, and the VI visibility drop time is lower than the preset VI visibility drop time, the fan adjustment is not performed, if not, proceed to the next step; the CO concentration drop time is the time required to reduce the CO concentration in the tunnel to the first CO concentration threshold value with the current operating state of the fan in the area; the VI visibility drop time is the time required to reduce the VI visibility in the tunnel to the first VI visibility threshold value with the current operating state of the fan in the area; Get wind speed and direction in the tunnel; Determine whether the wind speed is within the preset wind speed range. If so, proceed to the next step. If not, obtain the wind speed of the vent within the preset space range in the tunnel within the preset wind speed range, update the wind speed in the tunnel, and proceed to the next step. Determine whether the wind speed is greater than or equal to 10m / s. If so, do not adjust the fan. Otherwise, proceed to the next step. Determine whether all fans in the control area are started. If yes, do not adjust the fans. If not, select a section with the lowest fan opening rate along the wind direction. In a section with the lowest fan opening rate, select the target fan according to the balanced wear plan; Select the same direction as the wind direction as the air outlet direction of the target fan, and prepare to turn on the target fan.

5. The method for adjusting the control strategy of the fan in the tunnel based on wear balancing according to claim 1 is characterized in that: The process of the second control strategy is as follows: Determine whether the CO concentration is greater than or equal to the second CO concentration threshold and less than or equal to the first CO concentration threshold, and whether the VI visibility is greater than or equal to the second VI visibility threshold and less than or equal to the first VI visibility threshold. If so, execute the wear leveling solution; if not, proceed to the next step; Turn off a fan that is turned on and controllable normally, and according to the wear balancing plan, select the fan with the longest cumulative opening time and prepare to turn it on.

6. The method for adjusting the control strategy of the fan in the tunnel based on wear balancing according to claim 5 is characterized in that: The first CO concentration threshold = the second CO concentration threshold + 20 mg / m 3 ; The first VI visibility threshold = the second VI visibility threshold + 2m.

7. The method for adjusting the control strategy of the fan in the tunnel based on wear balancing according to claim 5 is characterized in that: The normally controllable fan is a fan whose equipment functions normally and whose on or off action has a time difference with the current time that exceeds a preset time difference.

8. The method for adjusting the control strategy of the fan in the tunnel based on wear balancing according to claim 7 is characterized in that: The functions of the equipment specifically include: communication function and air supply function.

9. The method for adjusting the control strategy of a fan in a tunnel based on wear balancing according to claim 1 is characterized in that: The wear leveling scheme specifically includes: Select the fans in the area whose current startup time exceeds the time threshold; Get the cumulative running time of the fans in the area whose current startup time exceeds the time threshold; Select the fans whose cumulative running time exceeds 10% of the total running time of all fans this time as the fans exceeding the standard; Determine the section where the excessive fans are located in the tunnel; Determine whether there is an unactivated fan in the section where the excessive fan is located in the tunnel. If so, switch the unactivated fan. If not, switch the unactivated fan that is closest to the excessive fan.

10. A computer system comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the tunnel fan control strategy adjustment method based on wear balancing as described in any one of claims 1 to 9.

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