JP4448428B2 - Data recording device - Google Patents

Description

  The present invention relates to a data recording apparatus that records physical quantities measured by a measuring instrument.

Data recording devices that measure physical quantities and record and collect measurement data are known. For example, as one of the data recording devices, a device (hereinafter referred to as “ride comfort data recording device”) that records ride comfort data (hereinafter referred to as “ride comfort data”) of a railway vehicle as disclosed in Patent Document 1. ") Is known.
JP 2004-98878 A

  This riding comfort data recording device is installed in a railway vehicle during a test run, etc., and measures the acceleration, travel speed, and travel position in each of the three axes in the up / down / left / right and front / rear directions, and records them at any time. .

FIG. 7 shows a typical schematic configuration example of a conventional ride comfort data recording apparatus 101. In the following description, the traveling direction of the railway vehicle is the x-axis direction, the direction parallel to the floor surface and perpendicular to the x-axis direction (the left-right direction with respect to the traveling direction) is the y-axis direction, and the direction perpendicular to the floor surface (progression) The vertical direction with respect to the direction) is taken as the z-axis direction.
As shown in the figure, the data recording apparatus 101 includes an acceleration measuring unit 2, a velocity position measuring unit 3, an AD converting unit 105, a data recording unit 106, and an analysis output unit 107.

The acceleration measuring unit 2 includes an acceleration sensor 21 that is, for example, a servo-type triaxial accelerometer. The acceleration sensor 21 converts the current acceleration in the x-axis direction, the y-axis direction, and the z-axis direction to x acceleration, y acceleration, and Measured as z acceleration.
The speed position measuring unit 3 includes a speed generator 31 that is provided at an end of the axle and measures the rotational speed of the axle as a running speed, and a GPS 32 that measures the current position of the railway vehicle.

  The x acceleration, y acceleration, z acceleration, travel speed, and position measured by the acceleration measurement unit 2 and the speed position measurement unit 3 are analog / digital converted by the AD conversion unit 105, and x acceleration data 61 and y acceleration data 62 are obtained. , Z acceleration data 63, velocity data 68, and position data 69 are recorded as time transition recording by the data recording unit 106 at any time.

After completion of the test run, each recorded measurement data is output from the data recording unit 106 to the analysis output unit 107, and the analysis output unit 107 graphs and outputs each measurement value along the running time axis. Such an analysis process is performed.
For example, a graph as shown in FIG. 8 is displayed and output based on each measurement data.

  FIG. 8A shows the time change of the y acceleration drawn based on the y acceleration data 62. FIG. 8B shows temporal changes in the speed and position of the railway vehicle drawn based on the speed data 68 and the position data 69. A broken line x1 represents a traveling speed, a solid line x2 represents a traveling position according to kilometer, and the horizontal axis in both figures represents a common time.

  By the way, as shown in the figure, there is a large difference in change in the amount of change per unit time (hereinafter referred to as “temporal density”) between the traveling speed and position and the acceleration.

  That is, with respect to a temporal change amount appearing as a slope at a point on each curve in the figure, which represents a temporal change in a physical quantity such as a traveling speed, for example, between time 0.2 seconds and time 0.4 seconds (hereinafter, “ Comparing with respect to “time of interest”), the results are as follows.

As can be seen from the fact that the slopes at, for example, the four points x31, x32, x33, and x34 on the curve in FIG. It has changed greatly over time.
On the other hand, the traveling speed curve x1 in FIG. 8B has a substantially constant slope over the time of interest, so the amount of temporal change in speed is substantially constant and hardly changed. Further, as can be seen from the inclination of the position curve x2, for example, at two points x21 and x22, the temporal change in position is relatively small throughout the time of interest.

  Thus, the temporal density of the running speed and position of the railway vehicle is considerably smaller than the temporal density of acceleration. Such a large difference in temporal density is similarly observed throughout the measured data.

  However, as shown in FIG. 7, the conventional ride comfort data recording device 101 has a processing system from the acceleration sensor 21, the speed generator 31, and the GPS 32 to the data recording unit 106 as a measuring instrument for each measuring instrument. Each part is connected by a separate cable. This is not limited to the ride comfort data recording apparatus 101, but can be applied to the entire data recording apparatus. That is, when measuring a plurality of physical quantities at the same time and recording / collecting the measurement data, the number of physical quantities measured by the processing system from each measuring instrument to the recording unit is necessary because the measuring instruments are separate. is there. For this reason, with the increase in the number and types of physical quantities to be measured, the number of cables connecting each part has increased, and wiring has become complicated. Moreover, since it is necessary to record each measurement data equally, the processing speed according to the number of physical quantities to measure was requested | required. Further, the required memory capacity for recording measurement data has increased according to the number of physical quantities to be measured.

  However, as described above, there is a large difference in temporal density between the physical quantities to be recorded by the data recording apparatus. Is it possible to improve the efficiency of the data recording device by using this difference in time density? The present invention has been made in view of such problems.

The first invention for solving this problem is:
A first measuring means for measuring a first physical quantity (for example, the acceleration sensor 21 in FIG. 1);
Second and third measuring means (for example, the GPS 32 and the speed generator 31 in FIG. 1) that measure the second and third physical quantities, respectively, whose fluctuations in temporal variation are less than the first physical quantities,
Composite data generation means (for example, FIG. 2) that generates measurement composite data (for example, velocity position data d4 in FIG. 2) by time-sharing the measurement result by the second measurement means and the measurement result by the third measurement means. 2 velocity position modulation unit 4),
The time transition record (for example, x acceleration data 61 and y acceleration data 62 in FIG. 1) is common to the measurement result data by the first measurement means and the measurement composite data generated by the composite data generation means. , Z acceleration data 63 and velocity position data 64), and recording means (for example, the data recording unit 6 in FIG. 1),
Is a data recording device (for example, the data recording device 1 of FIG. 1).

According to the first aspect of the invention, the measurement results of the second and third physical quantities are time-divided to generate measurement composite data, and the measurement composite data is output to the recording unit.
Therefore, since the measurement results of the second and third physical quantities whose fluctuation in temporal change is smaller than that of the first physical quantity are output to the recording means as measurement composite data, the measurement results are compared with the number of physical quantities that are simultaneously measured. The number of data to be recorded is small. For this reason, it is possible to improve efficiency in various aspects such as processing capacity required for recording, memory capacity required for recording, and the number of cables required for wiring.

The second invention is the data recording device of the first invention,
The composite data generation means has a range exceeding a predetermined threshold (for example, level x41 in FIG. 5A) out of the entire signal range of the measurement composite data (for example, range x4 in FIG. 5A). The range corresponding to the measurement result of the second measurement unit (for example, the range x43 in FIG. 5A), and the range less than the predetermined threshold is the range corresponding to the measurement result of the third measurement unit (for example, FIG. 5). As the range x42 in (a), conversion means for converting the measurement results of the second and third measurement means into signal values within the corresponding ranges (for example, the position converter 42 and the speed converter 41 in FIG. 2). ).

According to the second aspect of the invention, the measurement composite data is obtained by distributing the measurement result of the second physical quantity and the measurement result of the third physical quantity into a range exceeding the predetermined threshold and a range less than the predetermined threshold, respectively. Generated.
Therefore, the determination of the second physical quantity and the third physical quantity of the measurement composite data recorded in the recording unit is a simple process of comparing the value of the measurement composite data with a predetermined threshold value.

The third invention is the data recording apparatus of the second invention,
The conversion means reverses the magnitude direction of the signal so that the predetermined threshold is maximized and the maximum value of the measurement composite data is minimized with respect to the measurement result of the second measuring means, and the range exceeding the predetermined threshold It is characterized in that it is converted into a signal value within the range.

According to the third invention, when the measurement result of the second measuring means is converted into a signal value within the corresponding range, the predetermined threshold is maximized and the maximum value of the measurement composite data is minimized. The magnitude direction of the signal is inverted and converted to a signal value within a range exceeding a predetermined threshold.
Therefore, a state in which the signal value of the measured composite data is as small as possible is created in the vicinity of the predetermined threshold value, so that the second physical quantity and the third physical quantity are more clearly defined in the measured composite data recorded in the recording means. Can be determined.

The fourth invention is a data recording device according to any one of the first to third inventions installed in a railway vehicle,
The first measuring means is means for measuring acceleration;
One of the second and third measuring means is a means for measuring the traveling position (for example, GPS 32 in FIG. 1), and the other is a means for measuring the traveling speed (for example, the speed generator 31 in FIG. 1). ,
It is characterized by that.

  According to the fourth aspect, the acceleration of the railway vehicle is measured as the first physical quantity, and the travel position and the travel speed are measured as the second and third physical quantities.

The fifth invention is the data recording device of any one of the first to third inventions,
The second and third measuring means measure the same physical quantity at different measurement positions as the second and third physical quantities.

  According to the fifth aspect of the invention, the same physical quantity at different measurement positions is measured as the second and third physical quantities that have a smaller variation in temporal change than the first physical quantity.

  According to the present invention, the number of data to be recorded can be smaller than the number of physical quantities that are simultaneously measured. For this reason, it is possible to realize a data recording apparatus that is efficient in various aspects such as processing capacity required for recording, memory capacity required for recording, and the number of cables required for wiring.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following, a case where the data recording apparatus of the present invention is applied to a railcar ride comfort data recording apparatus will be described, but the form to which the present invention can be applied is not limited thereto.

  FIG. 1 is a block diagram showing a schematic configuration example of a riding comfort data recording apparatus (hereinafter simply referred to as “data recording apparatus”) 1 according to the present embodiment. The same parts as those of the data recording apparatus 101 shown in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 1, the data recording device 1 includes an acceleration measuring unit 2, a velocity position measuring unit 3, a velocity position modulating unit 4, an AD converting unit 5, a data recording unit 6, and an analysis output unit 7. Yes.

  The speed position modulation unit 4 time-divides the speed signal a4 and the position signal a5 related to the travel speed and position measured by the speed position measurement unit 3 by alternately performing analog / digital conversion, thereby obtaining speed position data d4. Output to the data recording unit 6.

The speed position modulation unit 4 schematically has an internal configuration shown in FIG. 2, for example.
In the figure, the speed position modulator 4 includes a speed converter 41, a position converter 42, a switch 43 and an ADC 44.

  The speed converter 41 appropriately amplifies, attenuates, and biases the signal level of the speed signal a4 input from the speed position measurement unit 3, and outputs the result as a speed conversion signal a6. The input speed signal a4 and the output speed conversion signal a6 are in a proportional relationship, and an example of the relationship is shown in FIG. In the figure, for the sake of simplicity of explanation, the speed is shown in place of the speed signal a4. However, the voltage value representing the speed detected by the speed generator 31 is actually the speed signal a4. In the figure, the speed conversion signal a6 is a signal of 0V when the speed (speed signal a4) is 0 km / h, and a signal of 2.5V when the speed is 17 km / h. Note that the minimum and maximum speeds assumed in the present embodiment are 0 km / h and 17 km / h, respectively.

  In this way, the signal level of the speed conversion signal a6 output from the speed converter 41 is always within the range of 0 to 2.5 V (hereinafter referred to as “speed range”). Further, since the signal level of the speed conversion signal a6 is a monotonically increasing function with respect to the speed, the speed is uniquely determined based on the signal level of the speed conversion signal a6 that falls within this speed range.

  The position converter 42 appropriately amplifies, attenuates, and biases the signal level of the position signal a5 input from the velocity position measurement unit 3 and outputs the signal as a position conversion signal a7. The input position signal a5 and the output position conversion signal a7 have a linear relationship, and an example of the relationship is shown in FIG. In the figure, for the sake of simplification of explanation, a position indicating a kilometer is shown instead of the position signal a5. However, for example, a voltage value indicating a position detected by the GPS 32 is the position signal a5. In the figure, the position conversion signal a7 is a signal of 5V when the position (position signal a5) is 395m and 2.5V when the position is 410m. Note that the minimum value and the maximum value of the position assumed in the present embodiment are 395 m and 410 m, respectively.

  In this way, the signal level of the position conversion signal a7 output from the position converter 42 is always within the range of 2.5 to 5 V (hereinafter referred to as “position range”). Further, since the signal level of the position conversion signal a7 is a monotonously decreasing function with respect to the position, the position is uniquely determined based on the signal level of the position conversion signal a7 that falls within the position range.

  Incidentally, in the case of the present embodiment, out of 0 to 5 V (hereinafter referred to as “all signal range”) that is the entire range of the analog signal, 2.5 V is a threshold signal level (hereinafter referred to as “threshold level”). The range below the threshold level is set as the speed range, and the range above the threshold level is set as the position range.

  Accordingly, the position converter 42 associates the threshold level (2.5 V) with the maximum position (410 m), and associates the maximum value (5 V) in the entire signal range with the minimum position (395 m). It can be said that the position signal a5 is converted to a signal level within a range exceeding the threshold level by performing conversion that inverts the magnitude direction of the signal.

  The switch 43 is connected between the ADC 44 and one of the speed converter 41 and the position converter 42 connected to the switch 43 (hereinafter referred to as “speed-side continuity” and “position-side continuity”, respectively). Is switched every 0.1 second period (hereinafter referred to as “switching period”).

  That is, as shown in FIG. 4A, speed-side conduction and position-side conduction are alternately performed at a frequency of 5 Hz (hereinafter referred to as “switching frequency”), and a speed conversion signal a6 and a position conversion signal a7 Are alternately output to the ADC 44 every 0.1 seconds. Hereinafter, a signal output from the switch 43 to the ADC 44 is referred to as a signal a8.

The ADC 44 performs analog / digital conversion on the signal a8 input from the switch 43 at a sampling frequency of 1 kHz, and outputs it to the data recording unit 6 as speed position data d4.
Therefore, as shown in FIG. 4B, the speed conversion signal a6 is subjected to analog / digital conversion at a sampling frequency of 1 kHz during the period in which the switching device 43 performs speed-side conduction, and the position conversion signal a7 during the period in which position-side conduction is performed. Are analog / digital converted at a sampling frequency of 1 kHz, and the speed conversion signal a6 and the position conversion signal a7 are analog / digital converted in a time division manner and output as speed position data d4.

  The speed position data d4 output from the speed position modulation unit 4 (FIG. 1) is recorded by the data recording unit 6 as speed position data 64.

  The x acceleration, y acceleration, and z acceleration measured by the acceleration measuring unit 2 are analog / digital converted by the AD conversion unit 5 and recorded as x acceleration data 61, y acceleration data 62, and z acceleration data 63, respectively. Recorded in Part 6.

  The data recording unit 6 is configured by a computer including a rewritable secondary storage device such as a hard disk. The data recording unit 6 performs time transition recording by recording the x acceleration data 61, the y acceleration data 62, the z acceleration data 63, and the velocity position data 64 along the common time axis (elapsed time) as needed.

The analysis output unit 7 includes a demodulation unit 71 for demodulating the velocity position data 64, and is configured by a computer, for example.
The demodulation unit 71 uses the velocity position data 64 recorded in the data recording unit 6 as data belonging to a speed range (range below the threshold level) (hereinafter referred to as “threshold level data”) and a position range (threshold level). And data belonging to a range that exceeds (hereinafter referred to as “threshold data”).

  Next, the demodulator 71 obtains the value of the traveling speed from the data less than the threshold based on the relationship shown in FIG. Specifically, the travel speed is obtained by applying the value of data less than the threshold to the vertical axis in the figure and obtaining the corresponding speed (horizontal axis in the figure). Similarly, the demodulator 71 obtains a position value from the threshold value excess data based on the relationship shown in FIG.

  Incidentally, the analysis output unit 7 and the demodulation unit 71 may be a circuit that realizes the above-described procedure, or may be realized by software. For example, the velocity position data 64 recorded in the data recording unit 6 is read into predetermined spreadsheet software, and is separated into data below the threshold value and data exceeding the threshold value on the spreadsheet software, and each is shown in FIG. The traveling speed and position may be obtained from the relationship.

  After the traveling speed and position are demodulated by the demodulator 71, the analysis output unit 7 creates a graph representing temporal changes in the traveling speed and position based on the demodulated traveling speed and position data. At this time, since the demodulated traveling speed and position data are intermittent points, a graph is created as a continuous line by linear interpolation between the points. Further, the analysis output unit 7 creates a graph representing the temporal change in acceleration based on the acceleration data 61, 62, 63 recorded in the data recording unit 6.

Next, how the data recording apparatus 1 records and demodulates the speed and position will be described with reference to FIG.
FIG. 5 is a diagram illustrating an example of temporal changes in measurement data and the like when the vehicle travels at the travel speed illustrated in FIG.

  The speed signal a4 output from the speed generator 31 is first converted by the speed converter 41 into a speed conversion signal a6 in the speed range. The position signal a5 output from the GPS 32 is first converted by the speed converter 41 into a position conversion signal a7 in the position range. In this case, the speed signal a4 is converted into a speed conversion signal a6 and a position conversion signal a7 based on the relationship shown in FIG. 3A and the position signal a5 based on the relationship shown in FIG.

  Next, the speed conversion signal a6 and the position conversion signal a7 are alternately output to the ADC 44 at a switching frequency of 5 Hz, converted from analog to digital by the ADC 44, and output as speed position data d4, and as the speed position data 64, the data recording unit 6 To be recorded.

  Thus, the measurement data shown in FIG. 5A is recorded as the speed position data 64. In the figure, the traveling speed and the position are recorded separately for each switching period of 0.1 seconds into a speed range (range x42) and a position range (range x43). ing.

When the speed position data 64 is output to the analysis output unit 7, the demodulation unit 71 demodulates the data into travel speed and position data as follows.
First, the speed position data 64 (FIG. 5A) is divided into data below the threshold and data exceeding the threshold. Subsequently, the complementary data less than the threshold value is demodulated into the data of the traveling speed based on the relationship shown in FIG. 3A, and the super-threshold data is converted into the position data based on the relationship shown in FIG. Demodulated.

  Then, the analysis output unit 7 creates, for example, a graph shown in FIG. 5B from the travel speed data and the position data demodulated by the demodulator 71 and outputs the graph. FIG. 5B is an enlarged graph showing changes in travel speed and position in 2 seconds. In FIG. 5B, it can be seen that a portion without actual data every 0.1 seconds due to the switching period is complemented by linear interpolation or the like. Although FIG. 5B is a graph showing the amount of change with respect to a minute time (FIG. 5B is 2 seconds), it may be difficult to understand, but the measurement data of speed and position is sufficiently accurate.

  In addition, the analysis output unit 7 creates and displays a graph of the time change of acceleration from the acceleration data 61, 62, and 63, similar to the conventional analysis output unit 107 described with reference to FIG. Since 61, 62, and 63 are data that are always AD-converted by the AD converter 5 during measurement, a graph similar to that shown in FIG.

  As described above, the data recording apparatus 1 of the present embodiment records time-division-modulated physical quantities having a relatively low temporal density such as travel speed and position with respect to physical quantities having a relatively high temporal density called acceleration. can do. In addition, since data is intermittently lost due to time division, there is no problem with respect to the lost part due to the low temporal density.

  In addition, by generating and recording the speed position data d4 by modulating the traveling speed and position in a time division manner, only one processing system for the measurement data relating to the traveling speed and position is required from the speed position modulating section 4 onward. Thus, compared with the conventional data recording apparatus 101 shown in FIG. 7, the processing speed is improved due to the reduction in the number of data to be recorded, the memory capacity required for recording the recorded data, and the number of cables connecting each part is reduced. The more efficient data recording device was realized.

  Moreover, the speed position modulation part 4 made the range which exceeds a threshold level among all signal ranges the position range, and made the range less than a threshold level the speed range. As a result, the demodulator 71 can determine whether the speed position data related to the recorded value of the speed position data 64 is the traveling speed data or the position data only by comparing the value of the recorded speed position data 64 with the threshold level.

  Further, the position converter 42 of the speed position modulation unit 4 inverts the magnitude direction so that the threshold level and the position maximum are associated with the maximum value and the position minimum within the entire signal range, respectively, in the position measurement data. And decided to convert it. As a result, as shown in FIG. 5A, it is possible to create a state where there is as little data as possible in the vicinity of the threshold level. For this reason, whether the data included in the speed position data 64 is data on the traveling speed. The position data can be more reliably determined.

  In the above-described embodiment, the case where the traveling speed is measured using the speed generator 31 and the position is measured using the GPS 32 has been described. However, the present invention is not limited to this, for example, You may make it measure a running speed and a position using a marker apparatus.

  The marker device is a device that records the time according to the recording operation of the examiner, and the recording operation is performed when passing through the predetermined point of the track sign, so that the predetermined point is set. This is a device that records the passage time. According to this marker device, it is possible to determine the position of the railway vehicle from the passage time and the passed point. Further, the traveling speed of the railway vehicle can be determined from the difference between the passing times of the two passing points and the distance between the two points.

  In the above-described embodiment, the relational expression used by the speed converter 41 for signal conversion has been described as the proportional relation shown in FIG. 3A. However, there is a mutual relationship between the speed signal a4 and the speed conversion signal a6. As long as the value of can be uniquely derived, other relational expressions may be used.

  For example, when the upper limit of the speed range of the railway vehicle in the test run is not clearly defined, a relational expression as shown in FIG. 6A may be used. In the case of the figure, the curve x5 representing the relationship between the speed and the signal level is set so as to gradually approach the threshold level (2.5V) while the signal level increases as the speed increases in the positive speed region. ing.

  Similarly, the relational expression used by the position converter 42 for signal conversion has been described as the relational expression shown in FIG. 3B, but the mutual value is uniquely derived between the position signal a5 and the position conversion signal a7. If possible, other relational expressions may be used.

  When the position range of the railway vehicle in the test run is not clearly defined, for example, a relational expression as shown in FIG. 6B may be used. In the case of the figure, the curve x6 representing the relationship between the position and the signal level is such that the signal level asymptotically approaches the threshold level of 2.5V as the position value decreases, and asymptotically approaches the maximum value (5V) as it increases. Is set to

  Further, in the above-described embodiment, the case where the present invention is applied to the riding comfort data recording apparatus of a railway vehicle has been described. However, the present invention is not limited to this, and measurement data of physical quantities having different temporal densities is recorded. As long as it is a device, it can be applied to any data recording device.

  As a first example, there is a climate observation device that measures wind speed, atmospheric pressure, and temperature and records measurement data. In this case, the atmospheric pressure and the air temperature have a smaller temporal density than the wind speed. For this reason, it is possible to realize an efficient climate observation apparatus by measuring and recording each physical quantity as air pressure and air temperature instead of travel speed and position in the above embodiment and as wind speed instead of acceleration.

  Further, as a second example, there is a measuring device that records the measurement data by measuring the wind pressure, the wind speed, and the noise amount in the wind tunnel test. In this case, the wind speed and the noise amount are smaller in temporal density than the wind pressure. For this reason, it is possible to realize a measuring device that achieves efficiency by measuring and recording each physical quantity as the wind pressure instead of the traveling speed and position in the above embodiment, and the wind pressure instead of the acceleration.

  As a third example, there is a measuring device that measures the rotational speed of the axle of the vehicle and the temperatures of the first and second bearings and records measurement data. In this case, the temperature of the bearing has a smaller temporal density than the rotational speed of the axle. For this reason, the temperature of the first and second bearings is used instead of the traveling speed and position in the above embodiment, and each physical quantity is measured and recorded as the rotational speed of the axle instead of the acceleration, thereby improving efficiency. A measuring device can be realized.

It is a figure which shows the internal structure of the data recording device of embodiment. It is a block diagram which shows the internal structure of a speed position modulation part. It is a figure which shows the signal level of the output by a speed converter and a position converter. It is a figure where it uses for description of the modulation | alteration by a velocity position modulation part. It is a figure where it uses for description of operation | movement of the modulation | alteration by a data recording device, and a demodulation. It is a figure which shows the signal level of the output by the speed converter and position converter of other embodiment. It is a figure which shows schematic structure of the conventional data recording device. It is a figure which shows the measurement data by the conventional structure.

Explanation of symbols

1 Data recording device 21 Acceleration sensor 31 Speed generator 32 GPS
4 speed position modulation unit 41 speed converter 42 position converter 6 data recording unit 61 x acceleration data 62 y acceleration data 63 z acceleration data 64 speed position data a4 speed signal a5 position signal d4 speed position data

Claims (5)

First measuring means for measuring a first physical quantity;
Second and third measuring means for measuring second and third physical quantities, respectively, with less variation in temporal variation than the first physical quantity;
Composite data generation means for generating measurement composite data by time-sharing the measurement result by the second measurement means and the measurement result by the third measurement means;
Recording means for recording the measurement result data by the first measurement means and the measurement composite data generated by the composite data generation means as a time transition record having a common time axis;
Data recording device with The data recording device according to claim 1,
The composite data generation unit sets a range exceeding a predetermined threshold among all signal ranges of the measurement composite data as a range corresponding to a measurement result of the second measurement unit, and sets a range below the predetermined threshold to the third range. A data recording apparatus comprising conversion means for converting the measurement results of the second and third measurement means into signal values within the corresponding ranges as ranges corresponding to the measurement results of the measurement means. The data recording device according to claim 2,
The conversion means reverses the magnitude direction of the signal so that the predetermined threshold is maximized and the maximum value of the measurement composite data is minimized with respect to the measurement result of the second measuring means, and the range exceeding the predetermined threshold A data recording device characterized by being converted into a signal value within. The data recording device according to any one of claims 1 to 3, wherein the data recording device is installed in a railway vehicle.
The first measuring means is means for measuring acceleration;
One of the second and third measuring means is a means for measuring a traveling position, and the other is a means for measuring a traveling speed.
A data recording device characterized by that. The data recording device according to any one of claims 1 to 3,
The data recording apparatus, wherein the second and third measuring means measure the same physical quantity at different measurement positions as the second and third physical quantities.

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