JPH08170935A - Body center of gravity measuring device and method - Google Patents

Abstract

PURPOSE: To provide a device and a method for measuring the center of gravity of a vehicle body by which the center of gravity of a vehicle body can be automatically measured with high accuracy. CONSTITUTION: A vehicle body is supported by a ball joint 14 fitted on an air spring bracket 13 of vehicle on a horizontal table 11 with elevating devices 15 and 16 and load cells 17 interposed. While the body is automatically kept horizontal by a height measuring device 18, calculator and controller, the loads at four points are measured to calculate the plane center of gravity. Next, the body is inclined and the changing amount of the loads at four points and the tilt angle thereof are measured so as to calculate the height of gravitational center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a measuring method for measuring the center of gravity of a car body of a railway vehicle.

[0002]

2. Description of the Related Art A pendulum vehicle of a railroad vehicle generally has a vehicle body tilting device as described in, for example, Japanese Patent Laid-Open No. 61-80553. In such a pendulum vehicle, it is necessary to know the position of the center of gravity of the vehicle body in order to understand its performance. Conventionally, the position of the center of gravity has been grasped by desk calculation.

[0003]

In the above prior art, the position of the center of gravity of the vehicle body is merely calculated on the desk, and the center of gravity of the actual vehicle is not measured when the vehicle is completed. However, in a running test of a pendulum vehicle having a body tilting device, an unpredictable result is often obtained from the position of the center of gravity calculated by a desk, and therefore, the position of the center of gravity needs to be measured in an actual vehicle.

An object of the present invention is to provide a vehicle body center of gravity measuring device and a measuring method capable of automatically measuring the position of the center of gravity of a vehicle body with high accuracy.

[0005]

In order to achieve the above object, an elevator for supporting a vehicle body and tilting the vehicle body, and a load cell for measuring a load at each support point,
A device for measuring the amount of elevation of each elevator, an arithmetic unit for arithmetically outputting a control command value for elevating the elevator by the output of the measuring device, and an arithmetic unit for arithmetically outputting the center of gravity according to the load information output by the load cell, and the arithmetic unit The control device for controlling the elevator according to the control command value is connected.

[0006]

The level of the vehicle body is automatically realized by the measuring device, the arithmetic unit and the control unit, the center of gravity of the plane is calculated by the arithmetic unit, and the inclination of the vehicle body is measured by the height measuring unit and the arithmetic unit. It is automatically realized by the control device, and the height of the center of gravity is calculated by the calculator.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4 show the structure of a body center of gravity measuring device of the present invention. In FIG. 1, 11 is a horizontal base and 12 is a test vehicle body. The test vehicle body 12 generally has four air spring seats 13a to 13d (represented by 13 as a representative) as shown in FIG.
There are four ball joints 14a to 14d (typically denoted by 14) for vertically transmitting the load when the test vehicle body 12 is tilted, and four points are provided on the four air spring seats 13 of the test vehicle body 12. Attach to form a rectangle.
The test vehicle body 12 includes an elevator 15a fixed to the horizontal base 11,
15b (represented by 15 as a representative) and a load cell 17a,
An elevator 16a, which is supported on one side in the width direction by ball joints 14a and 14b via 17b (represented by 17 as a representative), and can move the other side in the width direction on the horizontal base 11.
16b (represented by 16 as a representative) and a load cell 17c,
It is supported by ball joints 14c and 14d via 17d. Reference numeral 20 is a rail for moving the elevator 16.
Reference numeral 18 denotes a height measuring device for measuring the dimension between the horizontal base 11 and the air spring receiving seat 13, which is displaced to the outer side in the longitudinal direction of the test vehicle body 12 with respect to the mounting center of the ball joint 14 as shown in FIGS. Position (Dimension measurement points 19a to 1 in FIG. 3)
9d) It is attached so as to be integrated with the elevators 15 and 16 so that the distance between the horizontal base 11 and the air spring receiving seat 13 can be measured. The height measuring device 18 uses a laser measuring device.

In FIG. 4, reference numeral 21 is a calculator for inputting the output of the height measuring device 18 and calculating and outputting a control command value, 22
Is a control device that controls the elevators 15 and 16 according to the control command value of the computing unit 21. The calculator 21 is the load cell 17
The vehicle body weight center position is calculated from the output value of.

Next, the operation of the apparatus configured as described above will be described below. First, a method for measuring the plane center of gravity of the test vehicle body 12 will be described with reference to FIG. First, each required dimension is input (S12). The four height measuring devices 18 measure each dimension between the horizontal base 11 and the air spring receiving seat 13 (S
13) This input is input to the calculator 21 to calculate whether the test vehicle body 12 is horizontal (S14). If it is not horizontal, the control command necessary to make it horizontal is output to the control device 22 (S15). The control device 22 controls the elevators 15 and 16 based on the control command (S16), the height measuring device 18 measures the height again (S13), and inputs this output to the calculator 21 to determine whether it is horizontal. Judge (S1
4). This is repeated until the test vehicle body 12 becomes horizontal.

4 when the test vehicle body 12 is horizontally controlled
The output (S17) from one load cell 17 is calculated by the arithmetic unit 21.
(S18), and the plane center of gravity of the test vehicle body 12 is calculated (S19). The calculation formula of the plane center of gravity when the X and Y coordinates are taken as shown in FIG. 3 is shown below.

[0011]

[Equation 1]

Next, a method of measuring the height of the center of gravity will be described with reference to FIG. First, the test vehicle body 12 is made horizontal as described above, and then the outputs of the four load cells 17 are stored in the computing unit 21 (S52). The required dimensions, maximum tilt angle, and tilt angle interval are input (S53), and the elevators 16a, 16
The control device 2 issues a control command that raises b by a dimension corresponding to the inclination angle interval and does not move the elevators 15a and 15b.
It outputs to 2 (S54). The controller 22 controls the elevators 15 and 16 based on the control command (S55). The tilted state of the test vehicle body 12 is shown in FIG. Each dimension between the horizontal base 11 and the air spring seat 13 is measured by the four height measuring devices 18 (S56), and this output is input to the calculator 21 so that the test vehicle body 12 can obtain a desired inclination angle. The presence is calculated (S57). If the desired tilt angle is not obtained, the necessary control command is output to the control device 22 (S58). The control device 22 controls the elevators 15 and 16 based on the control command (S59), the height measuring device 18 measures the height again (S56), and inputs this output to the calculator 21 to obtain the target tilt angle. It is determined whether or not (S57). This is repeated until the vehicle body under test 12 has a desired inclination angle.

When the vehicle body under test 12 is controlled to the target inclination angle, the outputs (S60) from the four load cells 17 are stored in the calculator 21 as load data for the target inclination angle (S61). Then, the control command for the elevators 15 and 16 is output to the control device 22 for the next inclination angle (S5).
4). Thereafter, the load data for this inclination angle is stored in the calculator 21 in the same manner as described above. This is repeated at each input inclination angle interval until the maximum inclination angle input in S53 is reached, and the height of the center of gravity is calculated by the calculator 21 when all the respective data are stored. The calculation formula of the height of the center of gravity when the Z coordinate is taken as shown in FIG. 1 is shown below.

[0014]

[Equation 2]

As a result, the test vehicle body 12 can be automatically moved up and down, the vehicle body can be leveled and tilted with high accuracy, and the center of gravity of the vehicle body can be automatically measured with high accuracy.

[0016]

According to the present invention, the horizontal and inclined states of the vehicle body can be automatically realized with high precision, so that there is an effect that the vehicle body center of gravity can be measured with high precision.

[Brief description of drawings]

FIG. 1 is a front view showing a vehicle body center of gravity measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing a vehicle body weight measuring device according to an embodiment of the present invention.

FIG. 3 is a plan view showing a vehicle body center of gravity measuring apparatus according to an embodiment of the present invention.

FIG. 4 is a configuration diagram showing a vehicle body center of gravity measuring device according to an embodiment of the present invention.

FIG. 5 is a flowchart showing a method for measuring the center of gravity of a vehicle body plane according to an embodiment of the present invention.

FIG. 6 is a flow chart showing a vehicle body weight center height measuring method according to an embodiment of the present invention.

FIG. 7 is an external view of a vehicle body inclination showing a method for measuring a vehicle body center height according to an embodiment of the present invention.

[Explanation of symbols]

11 ... Horizontal base, 12 ... Test vehicle body, 13 ... Air spring seat, 14 ... Ball joint, 15 ... Elevator, 16 ... Elevator, 17 ... Load cell, 18 ... Height measuring device, 19 ...
Dimension measurement points, 20 ... Rails, 21 ... Computing unit, 22 ... Control device.

Claims (2)

[Claims] 1. An elevator for supporting a vehicle body and tilting the vehicle, a load cell for measuring a load at each support point, a device for measuring the amount of elevation of each elevator, and an output of the measuring device. It comprises a computing unit for computing and outputting a control command value for raising and lowering the elevator, and computing and outputting a center of gravity according to the load information output by the load cell, and a controller for controlling the elevator by the control command value of the computing unit. A device for measuring the center of gravity of a vehicle body. 2. A vehicle body is supported at four points, the height of these four points is adjusted to make the vehicle body horizontal, the load at each supporting point is measured, and the center of gravity of the plane is calculated from the measured values to determine the four points of the vehicle body. A vehicle body characterized by adjusting the height of a point to incline the vehicle body, measuring the load at each support point, and calculating the height of the center of gravity from the amount of change in load from the horizontal load and the inclination angle of the vehicle body. Center of gravity measurement method.