JP2005300312A - On-table exciter and on-table excitation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-table exciter and an on-table excitation method, in which the reproduction accuracy of the actual road surface traveling state is improved. <P>SOLUTION: In the on-table exciter for exciting a vehicle for to which a tire is mounted on a mount table 11, the mount table 11 is divided into a plurality of sections which can be displaced under the circumstances independently of each other, and is provided with a load transmission mechanism 12 for transmitting the independent load for each of the plurality of sections. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a table-top excitation device that vibrates a vehicle on which a tire is mounted on a mounting table on the mounting table.

2. Description of the Related Art Conventionally, a stand-top vibration device that shakes a vehicle by placing the vehicle on a stand and applying a load to evaluate the vibration durability of the vehicle is known (for example, Patent Documents 1 and 2). In the table-top excitation device described in Patent Document 1, excitation is performed by directly applying loads in the left-right direction, the front-rear direction, and the up-down direction to the axle. In addition, in the tabletop vibrator described in Patent Document 2, with the tire mounted on a flat plate movable in the left-right direction, the front-rear direction, and the up-down direction, the vibration and vibration are combined by combining forces and displacements in each direction. Is to do.
Special table 2002-543417 JP 2000-338010 A

  When a vehicle travels on an actual road surface, since there are steps, protrusions, and the like on the actual road surface, loads applied to the vehicle are input from various contact points where the tire and the road surface come into contact with each other. That is, the tire ground contact surface is not a flat surface but has a complicated shape, and there are a plurality of contact points. Therefore, the vibration transmission characteristics of the tire show different characteristics during normal traveling without steps and during traveling with steps.

  However, in the above-described bench exciter described in Patent Document 1, since a load is applied to the axle rather than the tire, the vibration transmission characteristics of the tire cannot be taken into consideration. Therefore, it is necessary to model a tire that contains a lot of nonlinear elements. Under the present situation where accurate modeling is difficult, the reproduction accuracy of the bench excitation evaluation test is not always sufficient.

  On the other hand, in the above-described tabletop vibrator described in Patent Document 2, a tire is placed on a flat plate and a load is applied, but there is only one contact point between the flat plate and the tire. Therefore, the reproduction accuracy of the vehicle behavior when traveling on an actual road surface with a step or the like is not sufficient, and there is a limit to the improvement of the accuracy. Also, in order to reproduce off-road driving with large steps, the load cannot be transmitted well with a flat plate, so it is necessary to rely on an actual road driving test that requires evaluation man-hours instead of a bench test. In the upper vibration device, the application range of the vibration evaluation test was limited.

  Accordingly, an object of the present invention is to provide a tabletop vibration device and a tabletop vibration method that improve the reproduction accuracy of the actual road surface traveling state.

In order to solve the above problems, according to one aspect of the present invention,
In a table-top vibration device that vibrates a vehicle on which a tire is mounted on the table, on the table,
The mounting table is divided into a plurality of sections that can be displaced in an independent manner, and includes a load transmission mechanism that transmits a load independently to each of the plurality of sections. A vibration device is provided. Or
In the on-table vibration method for vibrating the vehicle on which the tire is mounted on the mounting table on the mounting table,
The mounting table is divided into a plurality of sections that can be displaced in a manner independent of each other, and includes a load transmission step of transmitting a load independently to each of the plurality of sections. An excitation method is provided.

  As a result, a load can be applied to the tire instead of the axle as in the prior art, so that modeling of the tire becomes unnecessary, and the reproduction accuracy of the actual road surface running state is improved. Furthermore, unevenness such as steps and protrusions can be simulated by dividing the mounting table on which the tire is mounted into a plurality of sections and transmitting the load independently to each of the plurality of sections. As a result, the reproduction accuracy of the actual road surface running state is further improved, and even when it is necessary to rely on an actual road running test etc., it becomes possible to evaluate the vibration, and the scope of application of the tabletop vibration device can be expanded. it can.

  In addition, the apparatus may further include a control device that controls the load transmission mechanism according to a predetermined program. The predetermined program includes input data to a predetermined part of the vehicle body when traveling on an actual road surface, and input to the same part during vibration. It is preferably created based on the input data. Alternatively, with respect to the above-described tabletop vibration method, the load in the load transmission step is controlled based on input data to a predetermined part of the vehicle body when traveling on an actual road surface and input data to the same part during vibration. It is preferable to further comprise a control step.

  As a result, an excitation control program that takes into account the vibration transfer function (characteristics) specific to the evaluation vehicle based on the input data to a predetermined part of the vehicle body when traveling on an actual road surface and the input data to the same part during vibration Can be created. Once the excitation control program for the actual road surface has been determined, the bench excitation test can be applied to the actual road surface, which was difficult to carry out on the platform due to poor reproduction accuracy. Can be implemented, and the evaluation man-hours can be reduced.

  The load transmission mechanism may be a link mechanism capable of displacing a plurality of sections of the mounting table in the axle direction in the same phase or in a rotational direction within a plane parallel to the mounting table. Is preferred. Alternatively, with respect to the above-described table excitation method, the load transmitting step may be performed by displacing a plurality of sections of the mounting table in the axial direction in the same phase, or in a rotational direction within a plane parallel to the mounting table. It is preferable to transmit the load by displacing the load.

  As a result, the entire plurality of sections can slide in the axial direction (left-right direction) or in the rotational direction in a plane horizontal to the mounting table, and can generate vibrations by generating a left-right force or yaw force on the tire.

  Moreover, it is preferable that the said load transmission mechanism consists of a link mechanism which can displace the some division of the said mounting base to the front-back direction of a vehicle by the same phase. Alternatively, with regard to the above-described table excitation method, it is preferable that the load transmitting step transmits the load by displacing a plurality of sections of the mounting table in the front-rear direction of the vehicle in the same phase.

  As a result, the whole of the plurality of sections slides back and forth, and the tire can be vibrated by generating a longitudinal force.

  Moreover, it is preferable that the said load transmission mechanism consists of a link mechanism which can displace the some division of the said mounting stand in the up-down direction mutually independently. Or it is preferable that the said load transmission process transmits the said load by displacing several divisions of the said mounting stand to an up-down direction independently from each other regarding the said on-table vibration method.

  As a result, the entire plurality of sections slide up and down, and the tire can be vibrated by generating a vertical force.

The load transmission mechanism is
A vertical link having one end pivotably connected to each of the plurality of compartments;
A cone-shaped pedestal rotatably connected to each of the other ends of the vertical link, and an outer peripheral portion of the bottom of the cone-shaped pedestal is rotatably connected to a partition at an outer edge of the plurality of partitions. The other end of the vertical link is pivotally connected, and the apex of the cone-shaped pedestal is connected to the section surrounded by the section on the outer edge of the plurality of sections. The cone-shaped pedestal connected to the other end;
An intermediate link that is pivotally connected between the middle portions of the vertical links that are pivotally connected to a corner corner of the plurality of compartments and that is parallel to the mounting table may be included.

  Thereby, it can be easily realized by the link mechanism without complicating means for transmitting the load independently to each of the plurality of sections of the mounting table.

The load transmission mechanism is
First and second axle direction links that are pivotally connected to any of the vertical links pivotally connected to the corners of the plurality of compartments, and are parallel to the axle direction;
A first and a second actuator for driving each of the first and second axle direction links;
The first and second actuators apply a force in the same direction to the first and second axle direction links in the axle direction, respectively, thereby exciting the vehicle on the mounting table in the axle direction. And
The first and second actuators apply forces in different directions to the first and second axle direction links in the axle direction, so that the vehicle on the placement table is parallel to the placement table. You may vibrate in the rotation direction in the plane.

  As a result, the entire structure is slid in the axle direction (left and right direction) or in the rotational direction in a plane horizontal to the mounting table by the link mechanism with a simple configuration, and the left and right force or yaw force is generated on the tire. Can be vibrated.

The load transmission mechanism is
A third axle direction link that is pivotally connected to the apex of the cone-shaped pedestal and is parallel to the axle direction;
A third actuator for driving the third axle direction link;
The third actuator may vibrate the vehicle on the mounting table in the vertical direction by applying a force in the axle direction to the third axle direction link.

  Thereby, the divided sections of the mounting table at the positions of the inner and outer wheels of the tire move in opposite phases, and vibration can be generated by generating protrusion inputs in the left-right direction on the tire.

The load transmission mechanism is
A first front-rear direction link that is rotatably connected to any one of the intermediate links parallel to the axle direction and is parallel to the front-rear direction of the vehicle;
A fourth actuator for driving the first longitudinal link;
The fourth actuator may vibrate the vehicle on the mounting table in the front-rear direction by applying the force in the front-rear direction to the first front-rear link.

  As a result, the whole of the plurality of sections slides back and forth by the link mechanism with a simple configuration, and the tire can be vibrated by generating a longitudinal force.

The load transmission mechanism is
A second longitudinal link that is pivotally connected to the apex of the cone-shaped pedestal and is parallel to the longitudinal direction;
A fifth actuator for driving the second front-rear direction link;
The fifth actuator may vibrate the vehicle on the mounting table in the up-down direction by applying a force in the front-rear direction to the second front-rear direction link.

  As a result, the divided sections of the mounting table at the front and rear positions of the tire move in opposite phases, and the protrusion input in the front and rear direction can be generated in the tire for vibration.

The load transmission mechanism is
A vertical link rotatably connected to the center of the bottom surface of the cone-shaped pedestal;
A sixth actuator for driving the vertical link;
The sixth actuator may vibrate the vehicle on the mounting table in the vertical direction by applying the vertical force to the vertical link.

  As a result, the entire structure can slide up and down by a link mechanism with a simple configuration, and the tire can be vibrated by generating a force in the vertical direction.

  According to the present invention, it is possible to improve the reproduction accuracy of the actual road surface traveling state.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a tabletop vibration exciter 10 that is an embodiment of the present invention. The mounting table 11 on which the tire is mounted is divided into nine sections in this embodiment. A load transmission mechanism 12 is connected to the mounting table 11 divided into nine sections so that a load can be transmitted independently to each section. That is, the load transmission mechanism 12 applies an independent load to each of the nine sections, and the divided tires on the mounting table 11 are vibrated. In the present embodiment, the mounting table 11 on which the tire is mounted is divided into nine parts, but the number of divisions is not particularly limited, and for example, by dividing into nine or more parts, a finer load is applied to the tire. Can be added, and the reproduction accuracy can be improved. Further, in order to illustrate the configuration of the load transmission mechanism 12 in an easy-to-understand manner, the mounting table 11 is made transparent in FIG.

  The load transmission mechanism 12 is configured by a link so that a load can be transmitted to nine sections independently. One end of nine vertical links is connected to each of the nine sections through a ball joint or the like so as to be rotatable. Moreover, the cone-shaped base 13 is connected to each of the other ends of the vertical link so that rotation is possible. Specifically, a vertical link (12a to 12d, 12f) rotatably connected to a section (11a to 11d, 11f to 11i) on the outer edge of the nine sections on the outer periphery of the bottom of the cone-shaped pedestal 13 Vertically connected to the section 11e surrounded by the sections (11a to 11d, 11f to 11i) on the outer edge among the nine sections, at the apex of the cone-shaped pedestal 13 A link 12e is connected. Further, between the middle portions of the vertical links (12a, 12c, 12g, 12i) that are rotatably connected to the corners (11a, 11c, 11g, 11i) at the corners of the nine sections. Intermediate links (12j, 12k, 12l, 12m) parallel to the table 11 are rotatably connected. The above links are links that serve as the skeleton of the load transmission mechanism 12, and links for applying loads in the vertical direction, the horizontal direction (axle direction), and the front-rear direction are connected to these links.

  A link for applying a load in the up-down direction, the left-right direction (axle direction), and the front-rear direction will be described with reference to FIGS. 2 is a front view of the load transmission mechanism 12 schematically represented, and FIG. 3 is a side view of the load transmission mechanism 12 schematically represented. 2 and 3 show one stationary state before the vibration, and the tire 14 is placed on the divided placing table 11. Any of the vertical links (12a, 12c, 12g, 12i) pivotably connected to the corner sections (11a, 11c, 11g, 11i) among the nine sections has a first parallel to the axle direction. An axle direction link 12n (hereinafter referred to as a first left / right input link 12n) and a second axle direction link 12o (hereinafter referred to as a second left / right input link 12o) are rotatably connected. Further, a third axle direction link 12p (hereinafter, left and right projection input link 12p) parallel to the axle direction is rotatably connected to the apex portion of the cone-shaped base 13. One of the intermediate links (12j to 12l) parallel to the axle direction among the intermediate links (12j to 12m) includes a first front / rear direction link 12q (hereinafter, front / rear input link 12q) parallel to the front / rear direction of the vehicle. Are connected so as to be rotatable. Further, a second front-rear direction link 12r (hereinafter referred to as a front-rear protrusion input link 12r) parallel to the front-rear direction is connected to the apex of the cone-shaped base 13 so as to be rotatable. In addition, a vertical link 12t is rotatably connected to the central portion of the bottom surface of the cone-shaped pedestal 13. A vertical link 12s is rotatably connected to the vertical link 12t.

  Note that the cone-shaped pedestal 13 rotates around a fulcrum 15 to which the up-down direction link 12t is connected within a range limited by each link length. Further, the vertical link 12t receives the action of force from the vertical link 12s and rotates in the front-rear direction around the fixed fulcrum 16.

  Hereinafter, the vibration method of the tabletop vibration apparatus 10 in the present embodiment will be described.

  As shown in FIG. 10, in performing a tabletop vibration evaluation test for evaluating the vibration characteristics of the vehicle, before the evaluation test, by actually traveling on the road surface to be evaluated, acceleration, load, etc. applied to the evaluation vehicle Measure input data. The measurement place is mainly a spindle part which is a tire mounting part. After that, first, in order to measure how the evaluation vehicle responds to vibrations, pre-data is taken at the spindle unit as in the actual road surface, by randomly vibrating on the table top vibration device. . By using the pre-data, a vibration transfer function (characteristic) unique to the evaluation vehicle can be obtained. If this vibration transfer function is known, the input data measured on the actual road surface to be evaluated is set as a target value, and it can be understood how to apply vibration to the target value. In other words, it is possible to create an excitation control program that takes into account the vibration transfer function for the control device that controls the load transmission mechanism of the tabletop excitation device. The program is stored in a control device including a CPU, a ROM, a RAM, and the like, and the load transmission mechanism is controlled by driving the actuator according to the program.

  Once the excitation control program for the actual road surface has been determined, the bench excitation test can be applied to the actual road surface, which was difficult to carry out on the platform due to poor reproduction accuracy. Can be implemented, and the evaluation man-hours can be reduced. Furthermore, since the vibration transfer function for the actual road surface is known, it becomes easy to correct the vibration transfer function even if the vehicle changes, and it is not necessary to measure the road surface data again, reducing the number of evaluation steps. Is peeled off. There is a great merit that the vibration evaluation can be carried out on the platform without running on the actual road surface at the development stage of the vehicle that you do not want to open to the outside.

  Next, the movement of the load transmission mechanism 12 in this embodiment during vibration will be described in detail.

  FIG. 4 is a front view showing the movement at the time of load input in the left-right direction (axle direction). The first left and right input links 12n and the second left and right input links 12o are connected to first and second actuators (not shown in particular) that apply a lateral force. The first and second actuators apply the same direction of force to the first left and right input links 12n and the second left and right input links 12o in the left and right directions, so that the entire nine sections slide to the left and right, and the tire 14 Vibrates by generating a lateral force. On the other hand, by applying forces in different directions in the left-right direction, the entire nine sections slide in the rotational direction within a horizontal plane, and the tire 14 is vibrated by generating a so-called yaw-direction force.

  FIG. 5 is a front view showing the movement when the left and right protrusion loads are input. A third actuator (not shown in particular) that applies a lateral force is connected to the left and right protrusion input link 12p. When the third actuator applies a force in the left-right direction to the left-right projection input link 12p, the cone-shaped pedestal 13 rotates about the fulcrum 15. As the cone-shaped pedestal 13 rotates, the divided sections of the mounting table at the positions of the inner and outer rings of the tire move in opposite phases, and vibration is generated by generating protrusion inputs in the left-right direction on the tire. For example, in FIG. 1, when a frontward load is applied to the left and right projection input link 12p, the sections (11a, 11d, 11g) are displaced upward, and the sections (11c, 11f, 11i) are displaced downward. Then, the sections (11b, 11e, 11h) are displaced to intermediate positions. That is, vibration is generated by generating a force in the so-called roll direction.

  FIG. 6 is a side view showing the movement when the longitudinal load is input. A fourth actuator (not particularly shown) that applies a force in the front-rear direction is connected to the front-rear input link 12q. When the fourth actuator applies a force in the front-rear direction to the front-rear input link 12q, the entire nine sections slide back and forth to generate a front-rear force on the tire 14 and vibrate.

  FIG. 7 is a side view showing the movement at the time of front / rear protrusion input. A fifth actuator (not shown) for applying a force in the front-rear direction is connected to the front-rear protrusion input link 12r. When the fifth actuator applies a force in the front-rear direction to the front-rear protrusion input link 12r, the cone-shaped base 13 rotates about the fulcrum 15. As the cone-shaped pedestal 13 rotates, the divided mounting table sections at the front and rear positions of the tire move in opposite phases, and vibration is generated by generating protrusion inputs in the front and rear direction. For example, in FIG. 1, when a load is applied to the front / rear projection input link 12r in the direction of the paper, the sections (11a, 11b, 11c) are displaced upward, and the sections (11g, 11h, 11i) are displaced downward. Then, the sections (11d, 11e, 11f) are displaced to their intermediate positions. That is, vibration is generated by generating a so-called pitch direction force.

  FIG. 8 is a side view showing the movement during vertical input. A sixth actuator (not particularly shown) that applies a force in the vertical direction is connected to the vertical link 12s. When the sixth actuator applies a force to the vertical link 12s, the vertical link 12t rotates in the front-rear direction around the fixed fulcrum 16. Then, when the vertical link 12t rotates, the entire nine sections slide up and down to generate a vertical force on the tire 14 and vibrate.

  Note that FIGS. 2 to 8 referred to above are schematically shown in order to describe the movement of each link in an easy-to-understand manner, and are not necessarily an accurate front view and side view.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, as shown in FIG. 9, the load transmission mechanism 12 is not configured by a link, but an actuator can be directly attached to each of a plurality of sections, and each section can be independently controlled to be vibrated. .

  Further, in this embodiment, the configuration is such that one tire is vibrated by one on-board vibration device 10, but the mounting surface of the divided mounting table 11 is enlarged so that four wheels of the vehicle are one. It is good also as a structure which vibrates with the stand top vibration apparatus 10. FIG. The vehicle body may be fixed with a jig so that only the front wheels or the rear wheels are vibrated.

  Moreover, the present invention can be applied not only to vehicles equipped with tires but also to single components such as suspensions as vibration targets.

  Moreover, it can be applied not only for vibration testing but also for measurement of sound generated by applying vibration, analysis of steering stability, confirmation of suspension and body strength, and the like.

It is a figure showing an example of the schematic structure of the vehicle height adjusting device of the present invention. It is a front view of the load transmission mechanism 12 schematically represented. It is a side view of the load transmission mechanism 12 schematically represented. It is a front view which shows the motion at the time of the load input of the left-right direction (axle direction). It is a front view which shows the motion at the time of right-and-left protrusion load input. It is a side view which shows the motion at the time of front-back load input. It is a side view which shows the movement at the time of front-back projection input. It is a side view which shows the motion at the time of up-down input. It is a figure which shows the other Example which attaches an actuator directly to each division | segmentation mounting base 11, and vibrates. It is a figure which shows the measurement of the load data at the time of a real road surface driving | running | working.

Explanation of symbols

10 on-board vibration device 11 mounting table 12 link 13 cone-shaped base 14 tire 15, 16 fulcrum

Claims (17)

In a table-top vibration device that vibrates a vehicle on which a tire is mounted on the table, on the table,
The mounting table is divided into a plurality of sections that can be displaced in an independent manner, and includes a load transmission mechanism that transmits a load independently to each of the plurality of sections. Excitation device.   The bench top excitation device according to claim 1 further provided with a control device which controls said load transmission mechanism according to a predetermined program.   The tabletop vibration device according to claim 2, wherein the predetermined program is created based on input data to a predetermined part of the vehicle body when traveling on an actual road surface and input data to the same part during vibration.   2. The load transmission mechanism comprises a link mechanism capable of displacing a plurality of sections of the mounting table in the axle direction in the same phase or in a rotational direction within a plane parallel to the mounting table. Or the tabletop vibration apparatus of 2 description.   The on-board vibration device according to claim 1 or 2, wherein the load transmission mechanism includes a link mechanism capable of displacing a plurality of sections of the mounting table in the front-rear direction of the vehicle in the same phase.   3. The on-board vibration device according to claim 1, wherein the load transmission mechanism includes a link mechanism capable of vertically displacing a plurality of sections of the mounting table. The load transmission mechanism is
A vertical link having one end pivotably connected to each of the plurality of compartments;
A cone-shaped pedestal rotatably connected to each of the other ends of the vertical link, and an outer peripheral portion of the bottom of the cone-shaped pedestal is rotatably connected to a partition at an outer edge of the plurality of partitions. The other end of the vertical link is pivotally connected, and the apex of the cone-shaped pedestal is connected to the section surrounded by the section on the outer edge of the plurality of sections. The cone-shaped pedestal connected to the other end;
An intermediate link that is pivotally connected between each intermediate portion of the vertical links that are pivotally connected to a corner corner of the plurality of compartments, and is parallel to the mounting table. Or the tabletop vibration apparatus of 2 description. The load transmission mechanism is
First and second axle direction links that are pivotally connected to any of the vertical links pivotally connected to the corners of the plurality of compartments, and are parallel to the axle direction;
A first and a second actuator for driving each of the first and second axle direction links;
The first and second actuators apply a force in the same direction to the first and second axle direction links in the axle direction, respectively, thereby exciting the vehicle on the mounting table in the axle direction. And
The first and second actuators apply forces in different directions to the first and second axle direction links in the axle direction, so that the vehicle on the placement table is parallel to the placement table. The tabletop vibration device according to claim 7, wherein vibration is performed in a rotational direction in a plane. The load transmission mechanism is
A third axle direction link that is pivotally connected to the apex of the cone-shaped pedestal and is parallel to the axle direction;
A third actuator for driving the third axle direction link;
The said 3rd actuator vibrates the vehicle on the said mounting stand to an up-down direction by applying the force of the said axle direction to the said 3rd axle direction link, The said Claim 7 or 8 characterized by the above-mentioned. The tabletop vibration device described. The load transmission mechanism is
A first front-rear direction link that is rotatably connected to any one of the intermediate links parallel to the axle direction and is parallel to the front-rear direction of the vehicle;
A fourth actuator for driving the first longitudinal link;
The fourth actuator may vibrate a vehicle on the mounting table in the front-rear direction by applying a force in the front-rear direction to the first front-rear link. The bench top vibration exciter in any one of 9 items. The load transmission mechanism is
A second longitudinal link that is pivotally connected to the apex of the cone-shaped pedestal and is parallel to the longitudinal direction;
A fifth actuator for driving the second front-rear direction link;
The said 5th actuator vibrates the vehicle on the said mounting base to the said up-down direction by applying the force of the said front-back direction to the said 2nd front-back direction link, From the said 7th characterized by the above-mentioned. 10. The table-top vibration device according to any one of 10 above. The load transmission mechanism is
A vertical link rotatably connected to the center of the bottom surface of the cone-shaped pedestal;
A sixth actuator for driving the vertical link;
The said 6th actuator vibrates the vehicle on the said mounting base in the said up-down direction by applying the said up-down direction force to the said up-down direction link, The any one of Claim 7 to 11 characterized by the above-mentioned. The on-table vibration device described in 1. In the on-table vibration method for vibrating the vehicle on which the tire is mounted on the mounting table on the mounting table,
The mounting table is divided into a plurality of sections that can be displaced in a manner independent of each other, and includes a load transmission step of transmitting a load independently to each of the plurality of sections. Excitation method.   The control step of controlling the load in the load transmission step based on input data to a predetermined part of the vehicle body when traveling on an actual road surface and input data to the same part during vibration. Tabletop excitation method.   The load transmitting step transmits the load by displacing a plurality of sections of the mounting table in the axle direction in the same phase or by displacing the plurality of sections in a rotational direction within a plane parallel to the mounting table. The bench top excitation method according to claim 13 or 14 characterized by things.   15. The on-board excitation method according to claim 13, wherein the load transmitting step transmits the load by displacing a plurality of sections of the mounting table in the front-rear direction of the vehicle in the same phase. The said load transmission process transmits the said load by displacing the some division of the said mounting stand independently in the up-down direction, The table | surface excitation method of Claim 13 or 14 characterized by the above-mentioned.

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