Method and apparatus for recording physical variables of transient acceleration events
First Claim
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1. A method for recording acceleration data comprising the steps of:
- monitoring the acceleration data with respect to a preselected first criterion;
integrating the acceleration data during each interval that the acceleration data meets the first criterion to produce a velocity change value;
comparing said velocity change value to a preselected second criterion;
if said velocity change value meets the second criterion, recording an event marker; and
if said velocity change does not meet the second criterion, discarding said velocity change value.
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Abstract
An acceleration recorder and related method for monitoring, discriminating, and recording acceleration events only when the acceleration and calculated velocity change both exceed selected trigger values. While the acceleration values meet a first, user-defined threshold, the acceleration values are integrated to calculate a velocity change value. If the velocity change value meets a second, user-defined threshold, the acceleration event, including the velocity change, is recorded in memory.
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Citations
45 Claims
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1. A method for recording acceleration data comprising the steps of:
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monitoring the acceleration data with respect to a preselected first criterion; integrating the acceleration data during each interval that the acceleration data meets the first criterion to produce a velocity change value; comparing said velocity change value to a preselected second criterion; if said velocity change value meets the second criterion, recording an event marker; and if said velocity change does not meet the second criterion, discarding said velocity change value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for monitoring, discriminating, and recording data comprising the steps of:
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monitoring data indicative of a physical variable and noting discrete events when the data exceeds a first trigger; integrating the data during each event to produce an integrated value; and recording information related to each event only when said integrated value exceeds a second trigger. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for recording data corresponding to physical variables comprising:
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monitoring a first variable; when said first variable meets a first threshold, beginning integration of said first variable to produce an integration value; when said first variable does not meet said first threshold, ending integration of said first variable; noting a peak value equal to a highest absolute value of said first variable encountered during said integration; comparing said integration value to a second threshold; and recording said integration value and said peak value only if the integration value meets said second threshold. - View Dependent Claims (16, 17, 18, 19)
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20. A data recorder for recording physical variables of transient acceleration events, comprising:
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a housing; an instrument means for sensing at least one physical variable, said instrument means housed within said housing; a memory means for storing data, said memory means including a plurality of locations, said memory means housed within said housing; and a control means for repeatedly polling said instrument means to generate a plurality of measurements, said control means including a discriminating means for determining a beginning and ending of a current event and further including integration means to integrate said one physical variable during said current event and define an integration value, said control means further including a comparing means to compare said integration value to a criterion and a recording means for recording said integration value if said integration value meets said criterion, said control means housed within said housing. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A data recorder for sensing physical variables, comprising:
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a housing; an acceleration mechanism for producing acceleration data representative of acceleration, said acceleration mechanism housed within said housing; a processor to sample the acceleration data and define a beginning of a current event when the acceleration data meets a first criterion, said processor further controlling a counter, a summer, and a peak-hold, said counter, summer, and peak-hold being initiated at said beginning of said current event, said counter monitoring a duration of said current event, said summer integrating said sampled acceleration data over said duration to produce an integration value, and said peak-hold monitoring a maximum absolute value of said sampled acceleration data for said duration of said current event, said processor defining an ending of said current event when said sampled acceleration data do not meet said first criterion, said processor housed within said housing; a data memory for recording a date/time value, said peak-hold, said integration value, and said duration if said integration value meets a second criterion, said data memory housed within said housing; and at least one communication port whereby said data memory may be moved to an external device and through which said first and second criteria may be defined, said communication port housed within said housing. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. An acceleration data recorder comprising:
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a housing; an accelerometer means mounted within said housing for producing an acceleration signal; memory means for storing data; control means coupled to said accelerometer means and said memory means for receiving the acceleration signal and recording selected data in said memory means, said control means including first discriminating means for determining when the acceleration signal exceeds a first trigger value corresponding to an event, integrating means for integrating the acceleration signal during the event to produce a velocity change signal, and second discriminating means for determining when the velocity change signal exceeds a second trigger value, said control means causing data corresponding to the event to be recorded in said memory means only when the velocity change signal exceeds the second trigger value. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45)
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Specification