Method to estimate the degree of compaction obtained at compaction and means to measure the degree of compaction for carrying out the method
First Claim
1. A method for estimating a compaction degree attained during compaction of a bed with a compacting machine which has a compacting drum rotatably connected to an axis and which can be moved forwards and backwards on top of the bed, the compaction drum for compaction of the bed being applied with a torque about the axis of the compaction drum which changes rotational direction between clockwise and counter-clockwise with a certain frequency of reversal to cause an oscillatory force to be applied to the bed, comprising the steps of:
- (a) sensing acceleration due to the oscillatory force of the compaction drum;
(b) generating a first value representing the acceleration for the center or axis of the drum in a direction perpendicular to the drum axis and approximately parallel to the bed;
(c) determining, by using the first value, at least one point of time or time interval when the compacting drum is in contact with the bed but where no appreciable slip is measured with respect to the bed and compaction drum;
(d) determining any one of the frequency of reversal and a period corresponding to the frequency of reversal and a parameter which is directly dependent upon one of these conditions;
(e) generating a second value representing the frequency of reversal or the period or the parameter described in said step (d); and
(f) estimating the degree of compaction attained by using the second quantity and the sensed acceleration sensed during at least one predetermined point of time or during at least part of a predetermined time interval.
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Accused Products
Abstract
Estimation of the degree of compaction of a bed when using a compacting machine employs an oscillatory principle. The oscillatory compacting machine is arranged to act on the bed by gravitational force and rapidly alternating horizontal force. The method uses a recorded signal from a horizontally mounted sensor connected to the bearing of the roller drum. The system for performing this method, utilizes a processor to calculate results which are presented by a display unit. Beside the acceleration sensor another sensor and a switch are used in order to enable calculation by the processor of different kinds of averages of the compaction meter value and also for determination of travel speed.
31 Citations
10 Claims
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1. A method for estimating a compaction degree attained during compaction of a bed with a compacting machine which has a compacting drum rotatably connected to an axis and which can be moved forwards and backwards on top of the bed, the compaction drum for compaction of the bed being applied with a torque about the axis of the compaction drum which changes rotational direction between clockwise and counter-clockwise with a certain frequency of reversal to cause an oscillatory force to be applied to the bed, comprising the steps of:
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(a) sensing acceleration due to the oscillatory force of the compaction drum; (b) generating a first value representing the acceleration for the center or axis of the drum in a direction perpendicular to the drum axis and approximately parallel to the bed; (c) determining, by using the first value, at least one point of time or time interval when the compacting drum is in contact with the bed but where no appreciable slip is measured with respect to the bed and compaction drum; (d) determining any one of the frequency of reversal and a period corresponding to the frequency of reversal and a parameter which is directly dependent upon one of these conditions; (e) generating a second value representing the frequency of reversal or the period or the parameter described in said step (d); and (f) estimating the degree of compaction attained by using the second quantity and the sensed acceleration sensed during at least one predetermined point of time or during at least part of a predetermined time interval. - View Dependent Claims (2, 3, 4, 5)
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6. A device for estimating a degree of compaction during a compaction of a bed with a compacting machine having a compacting drum, rotatably connected to an axis and which can be moved forwards and backwards on top of the bed, the compaction drum for the compaction of the bed is applied with a torque about the axis of the compacting drum, the torque changing rotational direction between clockwise and counter-clockwise with a certain frequency of reversal to cause an oscillatory force to be applied to the bed, comprising:
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first sensor means for sensing an acceleration due to the oscillatory force of the compaction drum and for generating a first value representing the sensed acceleration for a center or axis of the drum in a direction perpendicular to the drum axis and substantially parallel to the bed on which the compaction drum is moved forwards and backwards; contact determining means for determining, by using said first value), points of time or time intervals when the compaction drum is in contact with the bed and no appreciable slip is present; processing means for generating a second value representing any one of the frequency of reversal and a corresponding period corresponding to the frequency of reversal and a parameter which is directly dependent upon one of these conditions; and estimating means for a degree of compaction by using said second quantity and the sensed acceleration occurring during at least one predetermined point of time or during at least a significant part of at least one predetermined time interval. - View Dependent Claims (7, 8, 9)
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10. A method for estimating a compaction degree attained during compaction of a bed with a compacting machine which has a compacting drum rotatably connected to an axis and which can be moved forwards and backwards on top of the bed, the compaction drum for compaction of the bed being applied with a torque about the axis of the compaction drums, which changes between clockwise and counter-clockwise with a certain frequency of reversal to cause an oscillatory force to be applied to the bed, comprising the steps of:
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(a) sensing acceleration due to the oscillatory force of the compaction drum; (b) generating a first value representing the acceleration for the center or axis of the drum in a direction approximately parallel to the bed; (c) determining, by using the first value, at least one point of time or time interval when the compacting drum is in contact with the bed but where no appreciable slip is measured with respect to the bed and compaction drum; (d) determining any one of the frequency of reversal and a corresponding period corresponding to the frequency of reversal and a parameter which is directly dependent upon one of these conditions; (e) generating a second value representing the frequency of reversal or the period or the parameter described in said step (d); and (f) estimating the degree of compaction attained by using the second quantity and the sensed acceleration sensed during at least one predetermined point of time or during at least part of a predetermined time interval.
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Specification