A vibration compaction pass measurement method, control system, and roller

Abstract

This invention discloses a method, control system, and road roller for measuring the number of vibration compaction passes. The method includes: continuously acquiring time-domain acceleration data of the vibratory wheel of the road roller in the direction perpendicular to the ground; continuously performing time-frequency domain analysis on the acceleration data, obtaining frequency domain data including vibration frequencies at time intervals q; continuously monitoring the vibration frequency, using a starting reference point where the vibration frequency is greater than a threshold k1 Hz for m consecutive times, and an ending reference point where the vibration frequency is less than a threshold k2 Hz for n consecutive times, recording this as one vibration compaction pass, incrementing the cumulative vibration compaction pass count by 1; analyzing the frequency domain data within the time region from the starting reference point to the ending reference point to obtain and record the compaction effect value of that pass; evaluating the compaction effect and the cumulative vibration compaction pass count, outputting a processing plan, and then returning to the previous step. This invention achieves real-time acquisition of the number of vibration compaction passes through the analysis of vibration acceleration data, enabling automatic and rapid statistics of the number of vibration compaction passes.

Description

Technical Field

[0001] This invention relates to the field of vibratory roller control technology, and in particular to a method for measuring the number of vibration compaction passes, a control system, and a roller. Background Technology

[0002] Vibratory rollers use vibration loads to subject the compacted soil particles (such as earth-rock fill and pavement mixtures) to high-frequency vibration, causing them to lose interparticle friction and forcing them to rearrange and become denser. As the number of vibration compaction passes increases, the physical properties of the compacted material change. Compaction effectiveness values ​​can typically be obtained using methods such as sand cone compaction, bearing plate compaction, or intelligent compaction values ​​(CMV values) obtained through acceleration analysis. Furthermore, different compaction processes and equipment result in varying compaction effects. In some cases, when conducting compaction test sections to compare the compaction effects of different processes or equipment, it is necessary to record the number of compaction passes and the compaction effect data at different pass counts. Currently, the industry typically uses manual recording by eye observation to record the number of compaction passes, or uses GPS positioning technology to analyze roller positioning data to determine and record the number of compaction passes. When recording manually, because road rollers typically compact in a back-and-forth motion, each compaction pass takes only tens of seconds. It is necessary to wait for the manual recording to be completed and to match the compaction effect value before the next pass can be rolled. This is time-consuming and labor-intensive. Furthermore, the measurement of the number of rolling passes and the measurement of the compaction effect use different measurement systems, which can easily lead to data confusion. Using GPS positioning technology requires the use of GPS positioning equipment, which is costly. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a method, control system, and roller for measuring the number of vibration compaction passes. By analyzing vibration acceleration data, the number of vibration compaction passes can be obtained in real time. The vibration compaction pass measurement and control system can be integrated into the vibratory roller to achieve automatic statistics of the number of vibration compaction passes. It is simple, fast, and low in cost, and can also measure the compaction effect at the same time.

[0004] Technical solution: This invention includes the following steps:

[0005] Step 1: Continuously obtain time-domain acceleration data of the vibratory roller in the direction perpendicular to the ground;

[0006] Step 2: Continuously perform time-frequency domain analysis on the acceleration data, and obtain the data containing the vibration frequency in the frequency domain at time intervals q;

[0007] Step 3: Continuously monitor the vibration frequency. Take the vibration frequency being greater than the threshold k1 Hz for m consecutive times as the starting reference point and the vibration frequency being less than the threshold k2 Hz for n consecutive times as the ending reference point. Record this as 1 pass of vibration compaction. Increment the cumulative number of vibration compaction passes by 1. Analyze the frequency domain data in the time region from the starting reference point to the ending reference point to obtain and record the compaction effect value of this pass of vibration compaction.

[0008] Step 4: After evaluating the compaction effect and the cumulative number of vibration compaction passes and outputting the processing solution, return to Step 3; if a signal is detected that the cumulative number of compaction passes needs to be cleared to zero, output a processing solution that clears all compaction pass values ​​and compaction effect values ​​and restarts the accumulation of compaction passes from zero.

[0009] The data in the frequency domain that includes vibration frequencies includes: vibration frequency data, subharmonic acceleration amplitude data, harmonic acceleration amplitude data, and fundamental acceleration amplitude data.

[0010] The compaction effect value is obtained by using harmonic acceleration amplitude data and fundamental acceleration amplitude data at different times to obtain the intelligent compaction value (CMV) value at different times, and the average value of the CMV value within the compaction time range is preferred as the compaction effect value.

[0011] The compaction effect value is obtained by using subharmonic acceleration amplitude data and fundamental acceleration amplitude data at different times to obtain vibration values ​​at different times. The proportion of vibration values ​​within a certain range within the compaction time range is selected as the compaction effect value.

[0012] The m is preferably 1 / q to 3 / q, the n is preferably 0.8 / q to 1.5 / q, the k1 is preferably 0.6 to 0.9 times the set vibration frequency, and the k2 is preferably 0.6 to 0.9 times the set vibration frequency.

[0013] In step 4, if the proportion of a certain vibration value interval within the compaction time range exceeds a set threshold, it is determined that the compaction is over-compacted and a processing solution is output, and a mark is made on the compaction effect value of that pass.

[0014] In step 4, if the cumulative number of vibration compaction passes exceeds the set number of compaction passes S, the compaction effect value of the most recent cumulative S passes is retained, and the compaction effect value before the cumulative S passes is cleared.

[0015] A vibration compaction pass control system, comprising:

[0016] Acceleration measurement module: used to acquire the acceleration signal of the vibrating wheel in the direction perpendicular to the ground during the vibration start-up process, and process the above acceleration signal into acceleration data;

[0017] Data processing module: used to continuously perform time-frequency domain analysis on acceleration data, and obtain a set of data containing vibration frequencies in the frequency domain at time intervals q;

[0018] The execution control module is used to continuously monitor the vibration frequency. It takes the vibration frequency being greater than the threshold k1 Hz for m consecutive times as the starting reference point and the vibration frequency being less than the threshold k2 Hz for n consecutive times as the ending reference point. Each pass of vibration compaction is recorded. The module analyzes the frequency domain data within the time range from the starting reference point to the ending reference point, obtains and records the compaction effect value of that pass of vibration compaction, updates the cumulative number of vibration compaction passes, evaluates the cumulative number of vibration compaction passes, and outputs a processing plan.

[0019] A vibration compaction pass control system includes a compaction sensor, a controller, and a display.

[0020] The compaction sensor is installed on the vibrating wheel of the road roller and connected to the controller. It is used to acquire the time-domain acceleration data of the vibrating wheel of the road roller in the direction perpendicular to the ground, as well as the time-frequency domain analysis of the acceleration data and the acquisition of data including vibration frequency in the frequency domain.

[0021] The controller is placed on the vibratory roller and connected to the compaction sensor and display. It is used to obtain the number of vibration compaction passes based on the starting and ending reference points and the compaction effect value of each pass. It records the correspondence between the number of passes and the compaction effect value, evaluates the cumulative number of vibration compaction passes, and outputs a processing solution.

[0022] The display is placed on the vibratory roller and is used to display the cumulative compaction pass value, the number of compaction passes, and the compaction effect value corresponding to the number of compaction passes, as well as the input to clear the number of compaction passes.

[0023] A road roller comprising the aforementioned vibration compaction pass control system.

[0024] Beneficial effects: The present invention has the following advantages:

[0025] 1) This invention achieves real-time acquisition of the number of vibration compaction passes by analyzing vibration acceleration data. The vibration compaction pass measurement and control system can be integrated into the vibratory roller to realize automatic statistics of the number of vibration compaction passes. It is simple, fast, and low in cost, and can also measure the compaction effect at the same time.

[0026] 2) By taking the vibration frequency being greater than the threshold k1 Hz for m consecutive times as the starting reference point, and starting the count when the vibration state tends to be stable, the misjudgment of the start of vibration compaction caused by ground unevenness excitation can be prevented. By taking the vibration frequency being less than the threshold k2 Hz for n consecutive times as the ending reference point, the number of compaction passes can be eliminated due to the operator accidentally stopping and restarting the vibration for a short time, thus eliminating the repeated counting of compaction passes.

[0027] 3) By adding the proportion of a certain vibration value range within the compaction time range to the compaction effect value, it is possible to determine whether the compaction is over-compacted and display it. Attached Figure Description

[0028] Figure 1 This is a flowchart of the present invention;

[0029] Figure 2 This is a system block diagram of the present invention;

[0030] Figure 3 This is a block diagram of the road roller system of the present invention. Detailed Implementation

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] Example 1

[0033] like Figure 1 As shown, the vibration compaction pass measurement method of this embodiment includes the following steps:

[0034] Step 1: Continuously obtain the time-domain acceleration data of the vibratory roller in the direction perpendicular to the ground.

[0035] Step 2: Continuously perform time-frequency domain analysis on the acceleration data. At each time interval q, a set of data containing vibration frequency in the frequency domain is obtained. The preferred time interval q is 16-50ms. The preferred data containing vibration frequency in the frequency domain are vibration frequency data, subharmonic acceleration amplitude data, harmonic acceleration amplitude data, and fundamental acceleration amplitude data.

[0036] Step 3: Continuously monitor the vibration frequency. Take the vibration frequency being greater than the threshold k1 Hz for m consecutive times as the starting reference point and the vibration frequency being less than the threshold k2 Hz for n consecutive times as the ending reference point. Record this as 1 pass of vibration compaction. Increment the cumulative number of vibration compaction passes by 1. Analyze the frequency domain data in the time region from the starting reference point to the ending reference point to obtain and record the compaction effect value of this pass of vibration compaction.

[0037] The compaction effect value is obtained by using harmonic acceleration amplitude data and fundamental acceleration amplitude data at different times to obtain the intelligent compaction value (CMV) at different times. The average value of the CMV within the compaction time range is selected as the compaction effect value.

[0038] The compaction effect value is obtained by using subharmonic acceleration amplitude data and fundamental acceleration amplitude data at different times to obtain the vibration value at different times. The proportion of vibration values ​​within a certain range within the compaction time range of that pass is selected as the compaction effect value.

[0039] m is preferably 1 / q to 3 / q, n is preferably 0.8 / q to 1.5 / q, k1 is preferably 0.6 to 0.9 times the set vibration frequency, and k2 is preferably 0.6 to 0.9 times the set vibration frequency.

[0040] Step 4: After evaluating the compaction effect and the cumulative number of vibration compaction passes and outputting the processing solution, return to Step 3; if a signal is detected that the cumulative number of compaction passes needs to be cleared to zero, output a processing solution that clears all compaction pass values ​​and compaction effect values ​​and restarts the accumulation of compaction passes from zero.

[0041] If the proportion of a certain vibration value range within the compaction time range exceeds a certain threshold, it is determined that the compaction is over-compacted and a processing solution is output, marking the compaction effect value of that pass.

[0042] If the cumulative number of vibration compaction passes exceeds the set number of compaction passes S, the processing scheme of retaining the compaction effect value of the most recent cumulative S passes and clearing the compaction effect value before the cumulative S passes is preferred. S is preferably 8 to 16.

[0043] Example 2

[0044] This embodiment provides a vibration compaction pass measurement and control system, including:

[0045] Acceleration measurement module 101: used to acquire the acceleration signal of the vibrating wheel in the direction perpendicular to the ground during the vibration start-up process, and process the above acceleration signal into acceleration data;

[0046] Data processing module 102: used to continuously perform time-frequency domain analysis on acceleration data, and obtain a set of data containing vibration frequency in the frequency domain at time intervals q;

[0047] The execution control module 103 is used to continuously monitor the vibration frequency. It takes the vibration frequency being greater than the threshold k1 Hz for m consecutive times as the starting reference point and the vibration frequency being less than the threshold k2 Hz for n consecutive times as the ending reference point. Each pass of vibration compaction is recorded. The frequency domain data in the time region from the starting reference point to the ending reference point is analyzed to obtain and record the compaction effect value of the pass of vibration compaction. The cumulative number of vibration compaction passes is updated, the cumulative number of vibration compaction passes is evaluated, and a processing plan is output.

[0048] Example 3

[0049] This embodiment provides a vibration compaction pass measurement and control system, which includes a compaction sensor 201, a controller 202, and a display 203.

[0050] The compaction sensor 201 is installed on the vibrating wheel of the road roller and connected to the controller 202. It is used to acquire the time-domain acceleration data of the vibrating wheel of the road roller in the vertical direction in step 1 of measuring the number of vibration compaction passes, and to perform time-frequency domain analysis of the acceleration data and acquire data including vibration frequency in the frequency domain in step 2.

[0051] The controller 202 is placed on the vibratory roller and connected to the compaction sensor 201 and the display 203. It is used to obtain the number of vibration compaction passes based on the starting reference point and the ending reference point, and to obtain the compaction effect value of the vibration compaction pass. It records the correspondence between the number of passes and the compaction effect value, evaluates the cumulative number of vibration compaction passes, and outputs the processing solution.

[0052] The display 203 is placed on the vibratory roller and is a human-machine interactive display. It is used to display the cumulative compaction pass value, the number of compaction passes and the compaction effect value corresponding to the number of compaction passes, as well as the input to clear the number of compaction passes.

[0053] The compaction sensor 201, controller 202, and display 203 are powered by the road roller.

Claims

1. A method for measuring the number of vibration compaction passes, characterized in that, Includes the following steps: Step 1: Continuously obtain time-domain acceleration data of the vibratory roller in the direction perpendicular to the ground; Step 2: Continuously perform time-frequency domain analysis on the acceleration data, and obtain the data containing the vibration frequency in the frequency domain at time intervals q; Step 3: Continuously monitor the vibration frequency. Take the vibration frequency being greater than the threshold k1 Hz for m consecutive times as the starting reference point and the vibration frequency being less than the threshold k2 Hz for n consecutive times as the ending reference point. Record this as 1 pass of vibration compaction. Increment the cumulative number of vibration compaction passes by 1. Analyze the frequency domain data in the time region from the starting reference point to the ending reference point to obtain and record the compaction effect value of this pass of vibration compaction. Step 4: After evaluating the compaction effect and the cumulative number of vibration compaction passes and outputting the processing solution, return to Step 3; if a signal is detected that the cumulative number of compaction passes needs to be cleared to zero, output a processing solution that clears all compaction pass values ​​and compaction effect values ​​and restarts the accumulation of compaction passes from zero.

2. The method for measuring the number of vibration compaction passes according to claim 1, characterized in that, The data in the frequency domain that includes vibration frequencies includes: vibration frequency data, subharmonic acceleration amplitude data, harmonic acceleration amplitude data, and fundamental acceleration amplitude data.

3. The method for measuring the number of vibration compaction passes according to claim 1, characterized in that, The compaction effect value is obtained by using harmonic acceleration amplitude data and fundamental acceleration amplitude data at different times to obtain the intelligent compaction value (CMV) value at different times. The average value of the CMV value within the compaction time range is used as the compaction effect value.

4. The method for measuring the number of vibration compaction passes according to claim 1, characterized in that, The compaction effect value is obtained by using subharmonic acceleration amplitude data and fundamental acceleration amplitude data at different times to obtain vibration values ​​at different times. The proportion of vibration values ​​within a certain range within the compaction time range is used as the compaction effect value.

5. The method for measuring the number of vibration compaction passes according to claim 1, characterized in that, In step 4, if the proportion of a certain vibration value interval within the compaction time range exceeds a set threshold, it is determined that the compaction is over-compacted and a processing solution is output, and a mark is made on the compaction effect value of that pass.

6. The method for measuring the number of vibration compaction passes according to claim 1, characterized in that, In step 4, if the cumulative number of vibration compaction passes exceeds the set number of compaction passes S, the compaction effect value of the most recent cumulative S passes is retained, and the compaction effect value before the cumulative S passes is cleared.

7. A vibration compaction pass control system, characterized in that, This system is used to implement the vibration compaction pass measurement method according to any one of claims 1 to 6, comprising: Acceleration measurement module: used to acquire the acceleration signal of the vibrating wheel in the direction perpendicular to the ground during the vibration start-up process, and process the above acceleration signal into acceleration data; Data processing module: used to continuously perform time-frequency domain analysis on acceleration data, and obtain a set of data containing vibration frequencies in the frequency domain at time intervals q; The execution control module is used to continuously monitor the vibration frequency. It takes the vibration frequency being greater than the threshold k1 Hz for m consecutive times as the starting reference point and the vibration frequency being less than the threshold k2 Hz for n consecutive times as the ending reference point. Each pass of vibration compaction is recorded. The module analyzes the frequency domain data within the time range from the starting reference point to the ending reference point, obtains and records the compaction effect value of that pass of vibration compaction, updates the cumulative number of vibration compaction passes, evaluates the cumulative number of vibration compaction passes, and outputs a processing plan.

8. A vibration compaction pass control system, characterized in that, The system is used to implement the vibration compaction pass measurement method according to any one of claims 1 to 6, and includes a compaction sensor, a controller, and a display; The compaction sensor is installed on the vibrating wheel of the road roller and connected to the controller. It is used to acquire the time-domain acceleration data of the vibrating wheel of the road roller in the direction perpendicular to the ground, as well as the time-frequency domain analysis of the acceleration data and the acquisition of data including vibration frequency in the frequency domain. The controller is placed on the vibratory roller and connected to the compaction sensor and display. It is used to obtain the number of vibration compaction passes based on the starting and ending reference points and the compaction effect value of each pass. It records the correspondence between the number of passes and the compaction effect value, evaluates the cumulative number of vibration compaction passes, and outputs a processing solution. The display is placed on the vibratory roller and is used to display the cumulative compaction pass value, the number of compaction passes, and the compaction effect value corresponding to the number of compaction passes, as well as the input to clear the number of compaction passes.

9. A road roller, characterized in that, The roller includes the vibration compaction pass control system as described in claim 7 or 8.

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