Abstract: The invention relates to a method for determining the soil stiffness (kB) of a soil area (2). For this purpose, a vibration-excited contact body (6, 8) of a soil compacting device (1) acts upon the soil surface (9) in such a way that during the acting upon an unsteady loss of contact (jumping) between the soil surface (9) and the contact body (6, 8) occurs. While acting upon the soil surface, parameters (f) of the oscillation excitation and parameters ({umlaut over (x)}d) of the oscillation response (xd) of the contact body (6, 8) are determined and from these in combination with known parameters (mu, ru, md) of the soil compacting device (1) the soil stiffness (kB) is computed.

Abstract: A method and device for machining materials includes a tool drum having tool shafts that support machining tools that can be driven in rotation. A drive element rotates the tool shafts and the tool drum relative to each other, and a drum carrier can be moved relative to the material by using a movement device. A control device varies the speed of the relative movement between the tool carrier and material and the rotational speed of the tool drum. To avoid critical operating points, one measuring sensor measures the natural translational vibration and/or another measuring sensor determines the rotational vibrations of the tool drum. The control device has a vibration analysis module, by which a vibration spectrum can be determined, and at least one controller module, by which drive parameters can be controlled as a function of the vibrations determined by the analysis module.

Abstract: A method and device for machining materials includes a tool drum having tool shafts that support machining tools that can be driven in rotation. A drive element rotates the tool shafts and the tool drum relative to each other, and a drum carrier can be moved relative to the material by using a movement device. A control device varies the speed of the relative movement between the tool carrier and material and the rotational speed of the tool drum. To avoid critical operating points, one measuring sensor measures the natural translational vibration and/or another measuring sensor determines the rotational vibrations of the tool drum. The control device has a vibration analysis module, by which a vibration spectrum can be determined, and at least one controller module, by which drive parameters can be controlled as a function of the vibrations determined by the analysis module.

Abstract: The invention relates to a soil compacting device having an exciter part (1), which has an unbalance exciter (2) for producing an intermittent exciter force and a contact surface (3) for transmitting a force component of the exciter force directed perpendicularly to the contact surface (3) to the soil surface (4) to be compacted as a pulsing compressive force. The device also has a vibration damper part (5), which is connected to the exciter part (1) by means of a spring-damper unit (15). The spring stiffness of the spring-damper unit (15), the damping of the spring damper unit (15), the spring pre-load of the spring-damper unit (15), the mass of the vibration damper part (5), the mass moment of inertia of the vibration damper part (5), the mass of the exciter part (1), and/or the mass moment of inertia of the exciter part (1) can be varied during operation.

Abstract: The invention relates to a method for determining the soil stiffness (kB) of a soil area (2). For this purpose, a vibration-excited contact body (6, 8) of a soil compacting device (1) acts upon the soil surface (9) in such a way that during the acting upon an unsteady loss of contact (jumping) between the soil surface (9) and the contact body (6, 8) occurs. While acting upon the soil surface, parameters (f) of the oscillation excitation and parameters ({umlaut over (x)}d) of the oscillation response (xd) of the contact body (6, 8) are determined and from these in combination with known parameters (mu, ru, md) of the soil compacting device (1) the soil stiffness (kB) is computed.

Abstract: The invention relates to a soil compacting device having an exciter part (1), which has an unbalance exciter (2) for producing an intermittent exciter force and a contact surface (3) for transmitting a force component of the exciter force directed perpendicularly to the contact surface (3) to the soil surface (4) to be compacted as a pulsing compressive force. The device also has a vibration damper part (5), which is connected to the exciter part (1) by means of a spring-damper unit (15). The spring stiffness of the spring-damper unit (15), the damping of the spring damper unit (15), the spring pre-load of the spring-damper unit (15), the mass of the vibration damper part (5), the mass moment of inertia of the vibration damper part (5), the mass of the exciter part (1), and/or the mass moment of inertia of the exciter part (1) can be varied during operation.

Abstract: The invention relates to a system for co-ordinated soil cultivation, said system comprising a plurality of soil compacting devices (W1, W2) used to determine location-related relative compacting values (V(W1; TB1, xi, yi;I?1 . . . n)), and a calibrating device (EV) used to determine location-related absolute compacting values. A calculating unit (R), which is connected to the compacting devices (W1, W2) and the calibrating device (EV) in such a way as to transmit messages, is used to correlate the obtained relative and absolute location-related compacting values. A system control (CPU1, . . .

Abstract: The invention relates to a system for co-ordinated soil cultivation, said system comprising a plurality of soil compacting devices (W1, W2) used to determine location-related relative compacting values (V(W1; TB1, xi, yi;I?1 . . . n)), and a calibrating device (EV) used to determine location-related absolute compacting values. A calculating unit (R), which is connected to the compacting devices (W1, W2) and the calibrating device (EV) in such a way as to transmit messages, is used to correlate the obtained relative and absolute location-related compacting values. A system control (CPU1, . . .

Abstract: According to the invention, a single device permits the relative soil rigidity values of a section of soil to be determined in a rapid measuring method and in addition, absolute soil rigidity values to be determined in a slightly slower method. If the device is calibrated with the aid of the measured absolute values, a rapid absolute measurement can also take place. The device can also be used for soil compaction.

Abstract: According to the invention, a single device permits the relative soil rigidity values of a section of soil to be determined in a rapid measuring method and in addition, absolute soil rigidity values to be determined in a slightly slower method. If the device is calibrated with the aid of the measured absolute values, a rapid absolute measurement can also take place. The device can also be used for soil compaction.

Abstract: Method and apparatus for compacting soil and for determining a mechanical characteristic of soil, including a method and apparatus for periodically compacting soil with a soil compacting device so as to make the soil and the soil compacting device vibrate together as a single oscillatory system, analyzing the vibration of the soil and soil compacting device, and adjusting an oscillatory driving force so as to drive the single oscillatory system towards a characteristic resonance frequency &OHgr;.