JPS5847234A - Vehicle riding comfort segment meter - Google Patents

Abstract

PURPOSE:To measure the riding comfort level at a high accuracy and easily with a small and light device by computing the results in the correction of outputs of an accelerometer with a riding comfort filter to indicate the level. CONSTITUTION:Outputs of an accelerometer 8 of a vehicle riding comfort segment meter arranged within a train are inputted into riding comfort filter 10 and 11 for vertical and horizontal vibrations via a preamplifier 9 and an absolute value is obtained with an absolute value circuit 12 through a selector switch 4 following the correction thereof for frequency components. The output of the circuit 12 is sent to an arithmetic memory processing section 15 via a sample hold circuit 13 and an analog-digital converter 14 to calculate an effective value of a weighted vibration acceleration, from which a riding comfort level is determined and indicated on a level display 2. On the other hand, the processing section 15 indicates an average time of the riding comfort on a time display 20 with the indication of the level. This enables the measurement of the riding comfort level at a high accuracy and easily with a small and light device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle ride comfort classifier that detects vibrations of a vehicle in an arbitrary travel section, converts the vibrations into a ride comfort level corresponding to human body sensations, and displays the result.

In order to increase the comfort inside trains and improve the quality of passenger transportation, there is an increasing demand for improving the ride comfort of rolling stock. In order to improve ride comfort, it is necessary to comprehensively implement measures in each department, such as rolling stock improvement and maintenance, track maintenance, etc., which are the main factors. In order to effectively perform this, it is necessary to accurately evaluate ride comfort,
It is necessary to quantitatively manage riding comfort. Furthermore, for this purpose, it is necessary to understand the riding comfort level of commercial trains.

However, conventionally, the level of ride comfort has been measured by recording vehicle vibrations on a -H magnetic tape and processing the recorded vehicle vibrations with a large-sized analysis device.

For this reason, there have been disadvantages in that the level of ride comfort cannot be easily measured and the level of ride comfort cannot be measured in real time.

The present invention has been made to solve the above-mentioned conventional drawbacks, and is small and lightweight, can be easily carried and installed in a vehicle, and can provide ride comfort in real time with sufficient accuracy through simple operation. It is an object of the present invention to provide a vehicle ride comfort classification meter that can measure the level.

The present invention will be described below based on embodiments shown in the drawings.

1 and 3 show the mechanical configuration of this embodiment. On the top surface of the main body case 1, a level display section 2 and a time display section 20 consisting of a liquid crystal display, a power switch 3, a measurement direction changeover switch 4, and Measurement start/end switch 5
is provided.

Note that the switch 5 has a structure that can also be operated remotely.

Furthermore, legs 6 are provided on the bottom surface of the main body case 1, and legs 7 are provided on the side surfaces thereof. Furthermore, a strain gauge type accelerometer 8 is built inside the main body case 1, and this accelerometer 8 is measured when the main body case 1 is in a horizontal position (a position where the legs 6 are placed on the floor (3)). When placed in the vertical position, vibrations in the left and right directions are detected, while when placed in the vertical position (the position where the legs 7 are placed on the floor), vibrations in the vertical direction are detected.

Further, the main body case 1 houses an electric circuit as shown in FIG. 4, which calculates the riding comfort level from the output of the accelerometer 8. Next, to explain this Figure 4,
The vibration waveform X(t,) output from the accelerometer 8 is amplified by the preamplifier 9 and passed through the vertical vibration ride comfort filter 10.
and is manually applied to the ride quality filter 11 for left and right vibrations.

Each of the ride comfort filters 10.11 converts the vibration acceleration output from the accelerometer 8 into a vibration equivalent to the sensation experienced by the human body, based on an isosensory curve as shown in FIG. This is a weighted correction for acceleration. That is, each ride comfort filter 10.11 has a characteristic of the reciprocal of the isosensory curve, as shown in FIG. Conversely, for frequency components for which the human body has a sharp sense of vibration, its magnitude is evaluated to be small (4
(In FIG. 6, the characteristics of the ride quality filter 10 for vertical vibration are shown as A, and the characteristics of the ride comfort filter 11 for lateral vibrations are shown as B).

The weighted waveform x(t) obtained by each of the ride comfort filters 1o and ii is input to the absolute value circuit 12 via the measurement direction changeover switch 4, and when measuring the absolute value, ” In the state where the output of the ride comfort filter 10 for lower vibrations is manually input to the absolute value circuit 12, and when measuring in the left and right direction, the output of the ride comfort filter 11 for left and right vibrations is input manually to the absolute value circuit 12. Each state shall be manually switched to the corresponding state.

The output of the absolute value circuit 12 is sent to the sample hold circuit 1.
3, the signal is sampled and held at a high-precision sampling period, and then manually inputted from this sample and hold circuit 13 to an A/D converter 14 that can measure a wide level range.
The converter 14 converts it into a digital value. In addition,
The absolute value circuit 12 includes an arithmetic storage processing section 1 which will be described next.
5, the weighting is based on the waveform x(t,)
Since it is sufficient to obtain the absolute value of A/D converter 1
This is provided to make effective use of 40 bits.

The arithmetic and storage processing section 15 is composed of a microprocessor, etc., and weighting is performed using the following formula from the output of the A/D converter 14 as the effective value (square root of the root mean square value) of the vibration acceleration.
Find a[-/s2].

Then, from this effective value a, the center of gravity level is determined by the following equation and displayed on the level display section 2.

LT=20 log, o(a/ar8.)
(21 where aret = 10-5rn/s2
It is. Also, T.B.

T and represent the times of the start and end points of the vibration waveform to be evaluated; in this embodiment, TB is the time when the measurement start/end switch 5 is turned to the "BEGIN" position, and To is the time when the measurement start/end switch 5 is turned to the "BEGIN"position;
This corresponds to the time when the end switch 5 is turned to the END'' position. T□-T B represents the average time '1''.

In addition, the arithmetic storage processing unit 15 further monitors momentary changes in ride comfort, so that the instantaneous value L(t
) (comfort level when the average time 'r is 2 seconds corresponding to the period of the lower limit frequency of the isosensory curve) is determined from the following equation.

(3) To explain more specifically, the arithmetic storage processing unit 15
A/D one after another with a sampling period of t = 25 ms
When the digital value output from the converter 14 is Xl, the ride comfort level 1''1 and the instantaneous value L(t) of the ride comfort level are calculated as follows, and the results are displayed as levels. Show it in part 2.

(1) Calculation measurement start/end switch 5 for ride comfort level LT is set to 13EG I N”
If it falls to the position, it is detected through the mark processing section 16, and the number of samples is j=o (4) (7) and the root mean square value XX is -0 (5).

Thereafter, every Δt = 25 ms, 1 is incremented by 1, and the calculation is performed, and then the measurement start/end switch 5 is set to "E".
When it is detected through the mark processing unit 16 that the robot has been tilted to the ND'' position, LT is immediately calculated using the following equation and displayed on the display unit 2.

LT=IOIOJo(XX4/a2rer)
(7) (11) Calculation of the instantaneous value L (t) of the ride comfort level When the power switch 3 is turned on, the number of samples is i = O + 8), the sum of squares YY1 = O + 9), and thereafter, every Δt = 25 ms, Increment 1 by 1, and YY, =YY1-0+X1'' (Perform 11 operations.

Then, when 2 seconds (80Δt) have passed since the power switch 3 was turned on, the root mean square value (8) YY is calculated from the following equation.

YY, = YY, /80 (11
)Furthermore, after more than 2 seconds have passed since the power switch 30 was turned on, the root mean square value of the past 2 seconds is always determined by shifting Δt == 25 ms using the following equation.

yy, =yy1-1-+(x2.-X21-B(1)/
8o (+2) Then, detect the maximum value Z of the root mean square value for the past 5 seconds every 5 seconds, and use this Z to calculate the maximum value of the instantaneous value of the ride comfort level for the past 5 seconds using the following formula, It is displayed on the display unit 2 for 5 seconds each.

L = 10 log, o(Z/a2ro, )
(1B) The ride comfort level L1 is displayed on the level display section 2 because after the power switch 4 is turned on, the measurement start/end switch l is moved to the "'BEGIN'" position, and then the required average After the time T has elapsed, this is only the time from when the switch is returned to the "END" position until the same switch and switch 5 are brought back to the "BEGIN"position; in other cases, the instantaneous value is always displayed on the level display. 2.

Furthermore, when displaying the ride comfort level LT on the level display section 2, the arithmetic storage processing section 15 displays the average time T at that time on the time display section 20, and also displays the instantaneous value I on the level display section 2. When displayed, the elapsed time from turning on the power switch 4 is displayed.

As described above, the classification of vehicle ride comfort according to the present invention includes an accelerometer, a ride comfort filter that corrects the output of this acceleration, and an analog signal obtained based on the output of the ride comfort filter that is A/D converted. By having an A/D converter, an arithmetic storage processing section that calculates a ride comfort level from the output of the A/D converter, and a display section that displays the ride comfort level, it is small and lightweight. This device can be easily carried and installed in a vehicle, and has the excellent effect of being able to measure the riding comfort level in real time with sufficient accuracy through simple operation.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the vehicle ride comfort classification needle according to the present invention, FIG. 2 is a side view showing the embodiment, FIG. 3 is a front view showing the embodiment, and FIG. FIG. 5 is a block diagram showing the electric circuit in the embodiment, FIG. 5 is an isosensory curve diagram, and FIG. 6 is a characteristic showing the characteristics of the ride comfort filter for lower vibration and the ride comfort filter for lateral vibration in the above embodiment. It is a diagram. . 2... Level display section, 8... Accelerometer, 10...
] - Ride comfort filter for lower vibration, 11. Ride comfort filter for lateral vibration, 14...A/D converter, 15. Arithmetic storage processing unit Patent applicant: Japanese National Railways (and 1 other person) agent, patent attorney Omori Izumi (11)

Claims (1)

[Claims] The accelerometer and the vibration acceleration detected by the accelerometer in the vertical and horizontal directions are each weighted and corrected based on isosensory curves that indicate the sensitivity of the human body to vibration frequencies. A vibration riding comfort filter, an A/D converter that converts analog signals obtained based on the outputs of these riding comfort filters into A'/D, and a digital value outputted from this A/D converter at an arbitrary time. 1. A vehicle ride comfort classifier comprising: a calculation storage processing section that calculates a ride comfort level in the vehicle; and a display section that displays the ride comfort level calculated by the calculation storage processing section.