Method for operating a ground compacting machine and ground compacting machine
By using alternating motion of dual rollers and different excitation modes, the problem of uneven surface of the ground compactor is solved, achieving a smooth and efficient compaction effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HAMM AG
- Filing Date
- 2023-03-22
- Publication Date
- 2026-06-12
Smart Images
Figure CN116791439B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for operating a ground compactor, and a ground compactor having two compactor rollers arranged spaced apart from each other along the longitudinal axis of the ground compactor and rotatable about their respective roller axes of rotation. To compact ground material in multiple consecutive compactor strokes, the rollers can move substantially along the longitudinal axis of the ground compactor in a first direction of motion and in a second direction of motion substantially opposite to the first direction of motion. To influence compaction performance, each compactor roller is equipped with a swinging excitation device, wherein each swinging excitation device is designed to apply an oscillating torque about its roller axis of rotation to the associated compactor roller in an oscillation-vibration excitation mode, and to apply a vibratory force substantially orthogonal to its roller axis of rotation to the associated compactor roller in a vibration-vibration excitation mode. Background Technology
[0002] WO 2013 / 113819 A1 discloses a compactor roller for a ground compactor, wherein an oscillating torque can be applied to the compactor roller in an oscillation-vibration excitation mode of a vibration excitation device to periodically apply torque about its axis of rotation, causing the compactor roller to accelerate back and forth in the circumferential direction. By applying this periodic oscillating torque and the resulting periodic back-and-forth rotational motion of the compactor roller, which is superimposed on the rolling motion of the compactor roller, a kneading effect or walking effect is produced, which is particularly helpful (especially in areas close to the ground surface) in improving compaction when the ground to be compacted is constructed with asphalt materials. The vibration excitation device of this known compactor roller can apply a force orthogonal to the axis of rotation under vibratory operation to act on the ground to be compacted with an impact motion to enhance compaction.
[0003] In this known compactor roller, the vibration excitation device includes an oscillating device with two oscillating mass units, each including an unbalanced oscillating mass that can rotate about an oscillating rotation axis parallel to but radially offset from the roller's rotation axis. The vibration device of this known compactor roller includes a vibration unbalanced mass that, in vibration-vibration excitation mode, can rotate about a rotation axis corresponding to the roller's rotation axis. Depending on whether the compactor roller operates in oscillating compaction mode or vibratory compaction mode, the oscillating unbalanced mass of the oscillating device is driven to rotate about its rotation axis, or vice versa.
[0004] The compactor roller known from EP 0 053 598 A1 includes a vibration excitation device with two unbalanced masses that can rotate about a rotation axis that is parallel to but eccentric to the roller's rotation axis. The vibration excitation device can switch between an oscillation-vibration excitation mode and a vibration-vibration excitation mode by adjusting the phase of the centers of gravity of the unbalanced masses relative to each other. Summary of the Invention
[0005] The purpose of this invention is to provide a method for operating a ground compactor and a ground compactor that achieves improved compaction results when the ground compactor is used effectively.
[0006] According to the invention, this objective is achieved by a method for operating a ground compactor comprising two compactor rollers arranged spaced apart from each other along the longitudinal axis of the ground compactor and rotatable about their respective roller axes. The ground compactor for compacting ground materials can move substantially along the longitudinal axis of the ground compactor in a first direction of motion and in a second direction of motion substantially opposite to the first direction of motion. When the ground compactor moves in the first direction of motion, one of the compactor rollers is the preceding roller in that direction, and the other compactor roller is the preceding roller in that direction of motion. The compactor rollers follow in the second direction of motion. When the ground compactor moves in the second direction of motion, one of the compactor rollers is the one following in the second direction of motion, and the other compactor roller is the one preceding in the second direction of motion. Each compactor roller is assigned a vibration excitation device, wherein each vibration excitation device is designed to apply an oscillating torque about its roller rotation axis to the associated compactor roller in an oscillation-vibration excitation mode, and to apply a vibrational force substantially orthogonal to its roller rotation axis to the associated compactor roller in a vibration-vibration excitation mode. Each compactor roller:
[0007] - It is operable in an oscillating compaction mode, in which the vibration excitation device assigned to the corresponding compactor roller operates in an oscillating-vibrating excitation mode.
[0008] - It is operable in vibratory compaction mode, in which the vibration excitation device assigned to the corresponding compactor roller operates in a vibration-vibration excitation mode.
[0009] - It is operable in static compaction mode, in which the vibration excitation device assigned to the corresponding compactor roller is deactivated.
[0010] When the ground compactor moves on the ground to be compacted in multiple consecutive compactor strokes, the ground compactor moves substantially along a first direction of motion and substantially along a second direction of motion in at least one stroke, and the following compactor rollers do not operate in a vibration compaction mode.
[0011] By operating the ground compactor such that, in at least one of a plurality of consecutive compactor strokes, the ground compactor moves in substantially opposite directions of motion, with the following (i.e., the one following along the direction of motion) compactor roller operating not in vibratory compaction mode, but in oscillatory compaction mode or static compaction mode, it is ensured that, after such a stroke, the surface structure resulting from the impact load on the ground to be compacted in vibratory compaction mode will not leave multiple consecutive impact grooves in the corresponding direction of motion. The following compactor roller ensures the smoothness of this surface structure, wherein the following compactor roller operates in static compaction mode or oscillatory compaction mode.
[0012] What is particularly advantageous here is that, at least during the last compactor stroke of a series of compactor strokes, the following compactor rollers do not operate in vibratory compaction mode, because after the last stroke, measures that affect the surface structure of the ground being compacted are essentially no longer performed.
[0013] If the following compactor rollers do not operate in vibratory compaction mode during each of the multiple compactor strokes, a particularly smooth surface structure can be achieved on the compacted ground, which is largely unaffected by the unevenness generated by the compaction process itself, and efficient compaction operations can still be achieved.
[0014] In order to utilize the compaction effect generated by the impact load on the ground in the vibration compaction mode, it is recommended that, preferably in each compaction stroke, the leading compaction roller be operated in the vibration compaction mode in at least one of the multiple compaction strokes.
[0015] To smooth out the unevenness on the surface of the ground to be compacted that inevitably occurs in the vibratory compaction mode, it is advantageous to operate the following compaction rollers in the oscillatory compaction mode in at least one of the multiple compaction strokes, preferably in each compaction stroke. Through the kneading or rolling effect generated in the oscillatory compaction mode, particularly in the near-surface area of the ground to be compacted, not only is a very compact structure produced in this area, but the grooved unevenness generated in the preceding vibratory compaction mode can also be substantially completely eliminated.
[0016] Unevennesses generated in vibratory compaction can also be eliminated, for example, by operating the following compactor rollers in static compaction mode during at least one of multiple compactor strokes, preferably during each compactor stroke. Using static compaction mode on the following compactor rollers can be highly advantageous if the ground to be compacted has already been adequately compacted in the near-surface area, but groove-like unevenness that may have occurred in the preceding vibratory compaction mode still needs to be eliminated.
[0017] The present invention also relates to a ground compaction machine, comprising:
[0018] Two compaction rollers are arranged spaced apart from each other along the longitudinal axis of the ground compactor and are rotatable about their respective roller axes. The ground compactor for compacting ground materials can move substantially along the longitudinal axis of the ground compactor in a first direction of motion and in a second direction of motion substantially opposite to the first direction of motion. When the ground compactor moves in the first direction of motion, one of the compaction rollers is the leading roller in that direction, and the other roller is the following roller. Similarly, when the ground compactor moves in the second direction of motion, the one roller is the following roller, and the other roller is the leading roller in that direction.
[0019] - A vibration excitation device assigned to each compactor roller, wherein each vibration excitation device is designed to apply an oscillating torque about its roller rotation axis to the associated compactor roller in an oscillation-vibration excitation mode, and to apply a vibrational force substantially orthogonal to its roller rotation axis to the associated compactor roller in a vibration-vibration excitation mode.
[0020] - A drive control unit for driving and controlling each vibration excitation device, wherein each vibration excitation device can be driven and controlled by the drive control unit:
[0021] - Operates in an oscillating compaction mode, wherein the vibration excitation device assigned to the corresponding compactor roller operates in an oscillating-vibration excitation mode.
[0022] - Operates in a vibration compaction mode, wherein the vibration excitation device assigned to the corresponding compactor roller operates in a vibration-vibration excitation mode.
[0023] - Operate in static compaction mode, in which the vibration excitation device assigned to the corresponding compactor roller is deactivated.
[0024] - Motion direction detection unit, used to provide motion direction information indicating the motion direction of the ground compactor.
[0025] -The drive control unit is designed to drive the vibration excitation device based on the motion direction information, so that when the ground compactor moves on the ground to be compacted in multiple consecutive compactor strokes, the ground compactor moves substantially along the first motion direction and substantially along the second motion direction in at least one stroke, and the following compactor rollers do not operate in vibration compaction mode.
[0026] In such a ground compactor, the drive control unit can be designed to perform the method according to the invention. Attached Figure Description
[0027] The present invention will now be described in detail with reference to the accompanying drawings. The drawings show:
[0028] Figure 1 This is a side view of a ground compactor with two compactor rollers;
[0029] Figure 2 This is a basic side view of the compactor rollers with their associated excitation device;
[0030] Figure 3 This is a plan view of the ground compactor in the compaction mode shown in the schematic diagram. Detailed Implementation
[0031] exist Figure 1 In this context, a ground compactor 12, which is also specifically used for compacting ground surfaces 10 constructed of asphalt materials, is typically designated as such. The ground compactor 12 includes a rear carriage 14 on which compactor rollers 16 rotate about a roller axis W. H It is rotatably supported. On the front carriage 20 of the ground compactor 12, the compactor roller 22 rotates around the roller axis W. V The compactor is rotatably supported, wherein the front vehicle 20 is pivotally connected to the rear vehicle 14 in the region of the articulated joint 18. Two compactor rollers 16, 22 are arranged spaced apart from each other along the longitudinal axis L of the ground compactor and have substantially parallel roller axes of rotation W oriented relative to each other as the ground compactor 12 travels straight forward. H W V .
[0032] The rear vehicle 14 also provides an operating console, usually indicated by 24, where the operator can find space to control the ground compactor 10 in compaction mode.
[0033] In compaction mode, the ground compactor 12 moves along two opposite directions B1 and B2 on the ground 10 to be compacted, these two directions being essentially aligned with the longitudinal axis L of the ground compactor. Figure 1In the design example of the ground compactor shown, the direction of motion B1 corresponds to the forward movement of the ground compactor 12, while the direction of motion B2 corresponds to the reverse movement of the ground compactor 12.
[0034] When the ground compactor 12 moves along the first direction of motion B1, the compactor rollers 22 mounted on the front vehicle 20 act as the leading compactor rollers, which travel first on the ground 10 to be compacted. The following compactor rollers, consisting of the compactor rollers 16 mounted on the rear vehicle 14, only travel on the ground 10 to be compacted after the leading compactor rollers (i.e., the compactor rollers 22 mounted on the front vehicle 20) have passed. Similarly, when the ground compactor 12 moves along the second direction of motion B2, the compactor rollers 16 mounted on the rear vehicle 14 act as the leading compactor rollers, while the compactor rollers 22 mounted on the front vehicle 20 act as the following compactor rollers. This means that when the ground compactor 12 moves alternately in the first direction of motion B1 and the second direction of motion B2, the two compactor rollers 16 and 22 alternately change their functions as the leading compactor roller and the following compactor roller.
[0035] Each of the two compactor rollers 16 and 18 is equipped with a corresponding vibration excitation device 26 or 28. In particular, when the two compactor rollers 16 and 18 are constructed identically to each other, especially when they have the same dimensions, the vibration excitation devices 26 and 28 can also be constructed identically to each other or have the same dimensions.
[0036] Each of the vibration excitation devices 26 and 28 is designed to apply a roller rotation axis W about the respective compactor roller 16 or 22 to its respective associated compactor roller 16 or 22 in an oscillation-vibration excitation mode. H W V The oscillating torque D, through which the compactor rollers 16 and 22 rotate around their roller axis W H W V It accelerates back and forth in a basically periodic manner in the circumferential direction. The compactor rollers 16 or 22 rotate around their roller axis W. H W V This periodic back-and-forth acceleration, or the resulting periodic back-and-forth rotational motion, superimposed on the rolling motion of the compactor rollers 16 or 22, results in a kneading or rolling effect (especially in the near-surface area of the ground 10 to be compacted).
[0037] Furthermore, each of the vibration excitation devices 26 and 28 is designed to generate, in a vibration-vibration excitation mode, the roller rotation axis W of the respective associated compactor rollers 16 and 22. H W VA fundamentally orthogonal vibrational force F is applied to either the compactor rollers 16 and 22 or to the rollers themselves. This force is orthogonal to the rolling axis of rotation W. H W V The vibration force of the compactor rollers 16 or 22 periodically presses or impacts the surface of the ground 10 to be compacted, thereby achieving a deeper compaction of the building material itself through this impact load on the ground 10. As the ground compactor 12 moves forward on the ground 10 to be compacted, the periodic impact load on the ground 10 in the vibration-vibration excitation mode results in multiple consecutive groove-shaped depressions that may appear on the surface of the ground 10 (especially when the degree of compaction of the ground 10 to be compacted is still relatively low) in the corresponding movement directions B1, B2 of the ground compactor 12.
[0038] Figure 2 The design of compactor rollers 16, 22 is illustrated by way of example and in schematic diagram, with vibration excitation devices 26, 28 assigned to or arranged therein. Each of these vibration excitation devices 26, 28 may include a vibration device 30 having a vibrational unbalanced mass 31 driven to rotate about a vibrational rotation axis. In the illustrated design example, the vibrational rotation axis corresponds to the respective roller rotation axis W. H W V .
[0039] To generate the oscillating torque D, each of the vibration excitation devices 26 and 28 may include an oscillating device 32, wherein the oscillating device 32 may include two oscillating unbalanced masses 34 and 36, which can be driven to revolve around their respective axes of rotation W. H W V Eccentric but parallel to the rolling axis of rotation W H W V The oscillating rotation axis rotates. Depending on whether the corresponding vibration excitation devices 26 and 28 are in oscillation-vibration excitation mode or vibration-vibration excitation mode, the vibration device 30 is activated while the oscillation device 32 remains inactive, or the oscillation device 32 is operated while the vibration device 30 remains inactive. In static compaction mode, the compaction of the ground 10 to be compacted is achieved solely by the load on the ground 10 to be compacted caused by the gravity of the ground compactor 12. For one or both of the compactor rollers 16 and 28, both the vibration device 30 and the oscillation device 32 can be deactivated or remain inactive.
[0040] It should be pointed out that, for reference Figure 2This is merely an example of the design of such vibration excitation devices 26 and 28, which, in terms of its structure or function, corresponds to the structure known from WO 2013 / 113819 A1. Of course, each of the vibration excitation devices 26 and 28 can also be constructed according to the principles disclosed in EP 0 053598A1, where switching between oscillation and vibration modes is possible by changing the phase of the center of gravity of the unbalanced mass relative to each other. However, at least in Figure 2 The possible operation in the structure shown is impossible in this structure, where both the oscillating device 32 and the vibration device 30 are in operation.
[0041] Activating the vibration excitation devices 26, 28 to perform compaction operations can be performed, for example, by an operator and coordinated with the movement of the ground compactor 12 in the first direction of movement B1 or the second direction of movement B2. Alternatively, the activation or deactivation of the vibration excitation devices 26, 28 can be automated and coordinated with the movement of the ground compactor 12 in the first direction of movement B1 or the second direction of movement B2, for example, according to a predetermined compaction schedule. For this purpose, the ground compactor 12 may include a drive control unit, typically indicated by 40, designed to drive the vibration excitation devices 26, 28 to compact the subsoil with their respective compaction operations. Since the operating modes of the vibration excitation devices 26, 28 assigned to the two compactor rollers 16, 22 depend on the direction of movement of the ground compactor 12, a direction of movement detection unit, typically indicated by 42 (which is associated, for example, with the compactor roller 22), can be provided on the ground compactor 12. The motion direction detection unit 12 can, for example, be designed to detect the rotation direction of the compactor roller 22 and feed motion direction information indicating that rotation direction to the drive control unit 40. Based on this rotation direction information, the drive control unit 40 then controls the two vibration excitation devices 26, 28 to operate in a suitable operating mode in the manner described below. It should be noted that the motion direction detection unit can be designed to provide motion direction information indicating the rotation direction in different ways. For example, the motion direction information can also be derived from the drive control of the ground compactor's drive system, since the drive control or operation of the drive system is obviously related to the motion caused by the operation of the drive system, and therefore also to the motion direction of the ground compactor 12.
[0042] The operation of compactor rollers 16 and 22 in different operating modes of the vibration excitation device 26 or 28, which are respectively activated and deactivated, is referenced below. Figure 3 To explain.
[0043] exist Figure 3 The image shows the ground 10 to be compacted, viewed from above. Figure 1The ground compactor 12 is illustrated in the example. The ground compactor 12 can, for example, be used to move on the ground 10 in multiple consecutive strokes according to a compaction plan and compact its building materials in the process. Each such stroke is performed by… Figure 3 The trajectory 38 shown defines a path in which the ground compactor 12 compacts the building material of the ground 10 with its compactor rollers 16, 22 as it moves in either the first direction of movement B1 or the second direction of movement B2. Typically, to achieve the desired degree of compaction, multiple such strokes are performed consecutively to repeatedly load the building material present in the corresponding trajectory 38 onto the ground 10. This means that in multiple such strokes, the ground compactor 10 moves alternately along substantially the same trajectory 38 in both the first and second directions of movement B1. Here, a transverse offset of the ground compactor 12 to the direction of movement can be provided between directly continuous strokes guided in different directions of movement, so that the trajectories 38 traversed in directly continuous strokes do not need to be perfectly identical to each other.
[0044] When compacting the ground 10, the ground compactor 12 is operated such that, regardless of whether it moves along the first direction of movement B1 or the second direction of movement B2, the following compactor rollers of the two compactor rollers 16, 22 do not operate in vibration compaction mode, in which the corresponding vibration excitation device 26 or 28 operates in oscillation-vibration excitation mode, i.e., for example, vibration device 30 is activated while oscillation device 32 is deactivated. Advantageously, in each consecutive stroke guided in different directions of movement, the following compactor rollers 16 or 22 do not operate in vibration compaction mode, but at least in the last stroke, for example, the area of the ground 10 to be compacted, represented by trajectory 38, is traversed.
[0045] Nevertheless, in order to produce a particularly advantageous effect on compaction through the vibration-vibration excitation mode, it can be configured, for example, such that at least for a portion of the consecutive strokes guided in different directions of motion, preferably for all such strokes, the first of the two compactor rollers 16, 18 operates in vibration compaction mode.
[0046] To ensure that the groove-like depressions generated on the upper side of the ground 10 during the vibration compaction mode of the corresponding preceding compactor rollers are smoothed or eliminated, the following compactor rollers of the two compactor rollers 16, 22 can be operated in either oscillatory compaction mode or static compaction mode, wherein the vibration excitation device 26 or 28 of the following compactor rollers of the two compactor rollers 16, 22 is deactivated. The unevenness generated on the surface of the ground to be compacted during the vibration compaction mode of the corresponding preceding compactor rollers is effectively eliminated by the rolling effect generated by the completely static load or the oscillatory compaction mode, while the ground 10 is further compacted by the rolling effect generated by the static load or the oscillatory compaction mode.
[0047] In operations that ensure the following compactor rollers do not operate in vibration mode, for example, each leading compactor roller operates in vibration compaction mode, while each following compactor roller operates in oscillating compaction mode or static compaction mode, whenever the movement direction of the ground compactor 12 reverses, because its stroke changes from having movement along the first movement direction B1 or the second movement direction B2 to having movement along the second movement direction B2 or the first movement direction B1, the operating mode of the compactor rollers 16, 22 also changes. This change can occur according to operator instructions or automatically. For this purpose, it is necessary, for example, to identify the movement direction of the ground compactor 12 based on the rotation direction of the compactor rollers 16 or 22 or GPS data, or to provide information indicating that movement direction. This information can then be used in the drive control unit of the ground compactor 12 to drive and control the vibration excitation devices 26, 28 distributed to the two compactor rollers 16, 22, so that they operate in their respective stroke-set operating modes, i.e., vibration compaction mode, oscillating compaction mode, or static compaction mode.
[0048] In principle, if multiple strokes are to be guided on the same trajectory 38 according to the compaction plan, the following stroke can also be set, in which the two compactor rollers 16 and 22 operate, for example, in static compaction mode or in oscillating compaction mode, while in another part of the stroke, each preceding compactor roller operates in vibratory compaction mode.
Claims
1. A method for operating a ground compactor (12), the ground compactor (12) comprising two compactor rollers (16, 22), the compactor rollers (16, 22) being spaced apart from each other in the direction of the longitudinal axis (L) of the ground compactor and being rotatable about a respective roller axis (W). H W V ) rotate, in which, The ground compactor (12) used for compacting the ground material to be compacted (10) is capable of moving in a first direction of motion (B1) and in a second direction of motion (B2) opposite to the first direction of motion (B1) along the longitudinal axis (L) of the ground compactor. When the ground compactor (12) moves in the first direction of motion (B1), one of the compactor rollers (16, 22) is the first compactor roller to move in the first direction of motion (B1), and the other compactor roller (16, 22) is the following compactor roller in the first direction of motion (B1). When the ground compactor (12) moves in the second direction of motion (B2), the first compactor roller (16, 22) is the following compactor roller in the second direction of motion (B2). The compactor rollers (16, 22) are compactor rollers that precede each other in the second direction of motion (B2), wherein each of the compactor rollers (16, 22) is assigned a vibration excitation device (26, 28), wherein, in order to compact the ground material, the ground compactor (12) moves alternately along the first direction of motion (B1) and the second direction of motion (B2) on the ground (10) to be compacted in a series of compactor strokes, wherein, in each compactor stroke, the ground compactor (12) moves along either the first direction of motion (B1) or the second direction of motion (B2), characterized in that each of the vibration excitation devices (26, 28) is designed to apply an oscillation-vibration excitation mode to the associated compactor roller (16, 22) about its roller rotation axis (W). H W V The oscillating torque (D) is applied to the relevant compactor rollers (16, 22) in the vibration-vibration excitation mode, and an orthogonal torque (W) is applied to their roller rotation axis. H W V The vibration force (F) of each compactor roller (16, 22) is capable of: - Operation in oscillatory compaction mode, wherein the vibration excitation devices (26, 28) assigned to the respective compactor rollers (16, 22) operate in an oscillatory-vibration excitation mode. - Operation in vibration compaction mode, wherein the vibration excitation devices (26, 28) assigned to the corresponding compactor rollers (16, 22) operate in vibration-vibration excitation mode. - Operate in static compaction mode, wherein the vibration excitation devices (26, 28) assigned to the corresponding compactor rollers (16, 22) are deactivated in the static compaction mode. In at least one of the plurality of compactor strokes, the preceding compactor roller operates in the vibratory compaction mode, and in each of the plurality of compactor strokes, the following compactor roller does not operate in the vibratory compaction mode.
2. The method according to claim 1, characterized in that, In each of the plurality of compactor strokes, the preceding compactor rollers operate in the vibratory compaction mode.
3. The method according to claim 1 or 2, characterized in that, In at least one of the plurality of compactor strokes, the following compactor rollers operate in the oscillating compaction mode.
4. The method according to claim 3, characterized in that, In each of the plurality of compactor strokes, the following compactor rollers operate in the oscillating compaction mode.
5. The method according to claim 1 or 2, characterized in that, In at least one of the plurality of compactor strokes, the following compactor rollers operate in the static compaction mode.
6. The method according to claim 5, characterized in that, In each of the plurality of compactor strokes, the following compactor rollers operate in the static compaction mode.
7. A ground compactor comprising two compactor rollers (16, 22), said compactor rollers (16, 22) being arranged spaced apart from each other in the direction of the longitudinal axis (L) of the ground compactor and being rotatable about the respective roller axis (W). H W V ) rotate, in which, The ground compactor (12) used for compacting the ground material to be compacted (10) is capable of moving in a first direction of motion (B1) along the direction of the longitudinal axis (L) of the ground compactor and in a second direction of motion (B2) opposite to the first direction of motion (B1). When the ground compactor (12) moves in the first direction of motion (B1), one of the compactor rollers (16, 22) is the first compactor roller to move in the first direction of motion (B1), and the other compactor roller (16, 22) is the following compactor roller in the first direction of motion (B1). When the ground compactor (12) moves in the second direction of motion (B2), the one compactor roller (16, 22) is the following compactor roller in the second direction of motion (B2). The other compactor roller in the compactor rollers (16, 22) is the compactor roller that precedes the other roller in the second direction of motion (B2). To compact the ground material, the ground compactor (12) moves alternately along the first direction of motion (B1) and the second direction of motion (B2) on the ground to be compacted (10) in a series of compactor strokes. In each compactor stroke, the ground compactor (12) moves along either the first direction of motion (B1) or the second direction of motion (B2). The compactor is characterized by a vibration excitation device (26, 28) associated with each of the compactor rollers (16, 22). Each of the vibration excitation devices (26, 28) is designed to apply an oscillation-vibration excitation mode to the associated compactor roller (16, 22) about its roller rotation axis (W). H W V The oscillating torque (D) is applied to the relevant compactor rollers (16, 22) in the vibration-vibration excitation mode, and an orthogonal torque (W) is applied to their roller rotation axis. H W V The vibration force (F) of the vibration excitation device (26, 28) is provided by a drive control unit (40) for driving each of the vibration excitation devices (26, 28), wherein each of the vibration excitation devices (26, 28) can be driven by the drive control unit (40): - Operation in oscillatory compaction mode, wherein the vibration excitation devices (26, 28) assigned to the respective compactor rollers (16, 22) operate in an oscillatory-vibration excitation mode. - Operation in vibration compaction mode, wherein the vibration excitation devices (26, 28) assigned to the corresponding compactor rollers (16, 22) operate in vibration-vibration excitation mode. - Operation in static compaction mode, wherein the vibration excitation devices (26, 28) assigned to the corresponding compactor rollers (16, 22) in the static compaction mode are deactivated, a motion direction detection unit (42) is set up to provide motion direction information indicating the motion direction of the ground compactor (12), and wherein the drive control unit (40) is designed to drive the vibration excitation devices (26, 28) based on the motion direction information, such that when the ground compactor (12) moves on the ground (10) to be compacted, in at least one of the plurality of compactor strokes, the preceding compactor roller operates in the vibration compaction mode, and in each of the plurality of compactor strokes, the following compactor roller does not operate in the vibration compaction mode.
8. The ground compactor according to claim 7, characterized in that, The drive control unit (40) is designed to perform the method according to any one of claims 1 to 6.