METHOD FOR MEASURING THE AMOUNT OF AUTOMOTIVE BODY DEFORMATION AND PROGRAM FOR MEASURING THE AMOUNT OF AUTOMOTIVE BODY DEFORMATION IN THE ANALYSIS OF THE CRASH-WORTHINESS OF AN AUTOMOBILE

Abstract

A method for measuring an amount of deformation of an automotive body in a crashworthiness analysis of an automobile according to the present invention includes: obtaining a crashworthiness analysis model (1) of the automobile (S1); performing a crashworthiness analysis of the crashworthiness analysis model (1) (S3); setting a measurement point of the amount of deformation of the automotive body and setting three reference points for measuring the amount of deformation of the automotive body at a portion without or with little deformation of the automotive body (S5); obtaining coordinates of the measurement point and the three reference points at an impact initiation (S7); obtaining coordinates of the measurement point and the coordinates of the three reference points after the impact (S9); calculating a distance at the impact initiation between the three reference points and the measurement point at the impact initiation (S11);obtaining the coordinates of the measurement points before the deformation of the automotive body in the crashworthiness analysis model (1) after the impact by using the distance at the start of the impact (S13), and measuring the amount of deformation of the automotive body by using the coordinates of the measurement points before the deformation of the automotive body and after the impact (S15).;

Description

Description METHOD FOR MEASURING THE AMOUNT OF AUTOMOTIVE BODY DEFORMATION AND PROGRAM FOR MEASURING THE AMOUNT OF AUTOMOTIVE BODY DEFORMATION IN THE ANALYSIS OF THE CRASH-WORTHINESS OF AN AUTOMOBILE Invention Engineering Field The present invention relates to a method for measuring an amount of automotive body deformation and a program for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile. Background of the Invention In recent years, the weight reduction of an automotive body, caused by an environmental problem, has been developed specifically in an automotive industry, and a computer-aided engineering analysis (CAE analysis) has become an essential technique for automotive body design. In this CAE analysis, a stiffness analysis, a crashworthiness analysis, a vibration analysis, and the like are carried out, which greatly contribute to the improvement in the performance of the automotive body. To improve crashworthiness with CAE analysis, for example, Non-Patent Literature 1 discloses a technique for acquiring a plastic deformation property of a steering frame during a frontal impact of a pickup truck with a crash simulation. List of Citations Non-Patent Literature Non-Patent Literature 1: Arita and friends, Improvement of Accuracy for Crash Worthiness Simulation of Frame of Pickup Truck, Transactions of the Society of Automotive Engineers of Japan, Vol. 46, no. 6, November 2015. Brief Description of the Invention Technical Issues However, the technique disclosed in Non-Patent Literature 1 is a crashworthiness analysis in which only a steering frame which is a part of the automotive body of an automobile is a target of analysis, and does not target the entire automobile. Thus, it is difficult to completely reproduce the deformation of the automotive body at the time of a collision of the automobile. In addition, as illustrated in Figure 10, even when the analysis of a side impact with a collider (11) is performed by utilizing a crashworthiness analysis model (1) in which the entire automobile is to be analyzed, the entire crashworthiness analysis model (1) generates parallel motions and rotational motions in addition to the deformation of an automotive body (3). Thus, as illustrated in Figure 10(c), in addition to a sum of automotive body deformations of the automotive body (3) resulting from the impact, displacements resulting from parallel motions or rotational motions of the entire crashworthiness analysis model (1) can be generated.Thus, to evaluate the amount of deformation of an automotive body by crashworthiness analysis using the crashworthiness analysis model (1) that models the entire automobile, a technique to eliminate an amount of motion resulting from parallel motion or rotational motion from the crashworthiness analysis model (1) is desired. The present invention has been made keeping in mind the above problems, and an object thereof is to provide, in a crashworthiness analysis using a crashworthiness analysis model of an automobile, a method for measuring an amount of automotive body deformation and a program for measuring the amount of automotive body deformation in the crashworthiness analysis of an automobile, said method and program being capable of measuring an amount of automotive body deformation from which an amount of motion resulting from a parallel motion or a rotational motion caused by impact in a crashworthiness analysis model is excluded. Solution to the Problem As a result of intensive studies on the problem described above, the present inventors have focused on the fact that there is a portion that is not deformed or very nearly not deformed by impact. Then, the present inventors have understood to measure an amount of deformation of an automotive body by eliminating an amount of parallel motion and an amount of rotational motion of an automobile due to impact using said portion. The present invention has been made based on the above studies, and specifically has the following configuration. A method for measuring an amount of deformation of an automotive body in a crashworthiness analysis of an automobile deformed by impact in a crashworthiness analysis according to a first aspect of the present invention is executed by a computer and includes: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion without or with little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of reference points of measurement points at the beginning of the impact in which step a distance to the measurement point at the beginning of the impact is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model at the beginning of the impact; a step for acquiring the coordinates of the measurement point before deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the distance of each of the three reference points at the beginning of the impact in the crashworthiness analysis model after the impact are acquired as the coordinates of the measurement point before deformation of the automotive body in the crashworthiness analysis model after the impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing the coordinates of the measurement point before the deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model after the impact, and the coordinates of the measurement point after the impact.; A method for measuring an amount of deformation of an automotive body in a crashworthiness analysis of an automobile deformed by impact in a crashworthiness analysis according to a second aspect of the present invention is executed by a computer and includes: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion without or with little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of reference points of measurement points after impact in which step a post-impact distance to the measurement point is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model after impact; a step for acquiring the coordinates of the measurement point after deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the post-impact distance of each of the three reference points in the crashworthiness analysis model at the beginning of impact are acquired as the coordinates of the measurement point after deformation of the automotive body by impact in the crashworthiness analysis model at the beginning of impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing coordinates of the measurement point after deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model at the start of the impact, and coordinates of the measurement point at the start of the impact.; A program for causing a computer to measure an amount of deformation of an automotive body of an automobile deformed by impact in a crashworthiness analysis according to a first aspect of the present invention causes the computer to execute: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of reference points of measurement points at the beginning of the impact in which step a distance to the measurement point at the beginning of the impact is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model at the beginning of the impact; a step for acquiring the coordinates of the measurement point before deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the distance of each of the three reference points at the beginning of the impact in the crashworthiness analysis model after the impact are acquired as the coordinates of the measurement point before deformation of the automotive body in the crashworthiness analysis model after the impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing the coordinates of the measurement point before the deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model after the impact, and the coordinates of the measurement point after the impact.; A program for causing a computer to measure an amount of deformation of an automotive body of an automobile deformed by impact in a crashworthiness analysis according to a second aspect of the present invention causes the computer to execute: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of reference points of measurement points after impact in which step a post-impact distance to the measurement point is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model after impact; a step for acquiring the coordinates of the measurement point after deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the post-impact distance of each of the three reference points in the crashworthiness analysis model at the beginning of impact are acquired as the coordinates of the measurement point after deformation of the automotive body by impact in the crashworthiness analysis model at the beginning of impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing coordinates of the measurement point after deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model at the start of the impact, and coordinates of the measurement point at the start of the impact.; Beneficial Effects of Invention According to the present invention, it is possible to exclude a sum of parallel movement and a sum of rotational movement of the entire automotive body due to an impact and to measure a sum of deformation of the automotive body at a measuring point at which the amount of deformation of the automotive body is measured. As a result, since the amount of deformation of the automotive body due to an impact can be accurately acquired, a phenomenon of deformation of the automotive body due to an impact can be understood, and improvement in crashworthiness and weight reduction of the automobile become possible. Short Description of Image Figure 1 is a flowchart illustrating a flow in a method for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile according to a first embodiment of the present invention. Figure 2 is a view describing a crashworthiness analysis of a crashworthiness analysis model targeted in a first embodiment, a second embodiment, and an example of the present invention. Figure 3 is a view illustrating the measurement points arranged on a floor panel of the crashworthiness analysis model in the first and second embodiments and examples. Figure 4 is a view to describe the reference points set in the crashworthiness analysis model in the first embodiment, the second embodiment, and the examples. Figure 5 is a view to describe a procedure for acquiring a quantity of automotive body deformation in a first embodiment. Figure 6 is a view to describe an example of acquiring a position that satisfies the same distance relationship as a distance at an impact initiation between a measurement point and three reference points at an impact initiation in the crashworthiness analysis model after impact in the first embodiment, ((a) three spherical surfaces centered on said three reference points, and (b) intersection points of said three spherical surfaces). Figure 7 is a flowchart illustrating a processing flow in a method for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile according to a second embodiment. Figure 8 is a view to describe a procedure for acquiring the amount of deformation of an automotive body in a second embodiment. Figure 9 is a view to describe an example of acquiring a position satisfying the same distance relationship as a post-impact distance between a measurement point and three reference points after impact in a crashworthiness analysis model at an impact initiation in the second embodiment ((a) three spherical surfaces centered on the three reference points, and (b) intersection points of the three spherical surfaces). Figure 10 is a view to describe a problem in crashworthiness analysis using a crashworthiness analysis model. Complete Description of the Invention Before describing methods for measuring an amount of automotive body deformation and programs for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile according to the first embodiment and the second embodiment of the present invention, a crashworthiness analysis model to be analyzed in the crashworthiness analysis in the first embodiment and the second embodiment will be described. <Model analisis kelaiktabrakan> As illustrated in Figure 2 as an example, a crashworthiness analysis model (1) targeted in the first embodiment and the second embodiment includes an automotive body (3) modeled by an element (a shell element and / or a solid element) and a node. The automotive body (3) includes a plurality of automotive body parts such as a floor panel (5) (Figure 3) modeled by the elements and nodes. [First Incarnation] Next, a method for measuring an amount of automotive body deformation and a program for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile according to a first embodiment of the present invention will be described below. <Metode untuk mengukur suatu jumlah dari deformasi bodi otomotif>A method for measuring an amount of deformation of an automotive body in a crashworthiness analysis of an automobile according to a first embodiment (hereinafter, referred to as a method for measuring an amount of deformation of an automotive body) is for measuring an amount of deformation of an automotive body of an automobile deformed by an impact in a crashworthiness analysis of an automobile, and includes, as illustrated in Figure 1, a crashworthiness analysis model acquisition step (S1), a crashworthiness analysis step (S3), a step for setting a measurement point of an amount of deformation of an automotive body and a reference point (S5), a step for acquiring the coordinates of the measurement point and the coordinates of the reference point at the beginning of an impact (S7), a step for acquiring the coordinates of the measurement point and the coordinates of the reference point after an impact (S9),a step to calculate a distance of reference points-measurement points at the beginning of the impact (S11), a step to acquire the coordinates of the measurement points before the deformation of the automotive body (S13), and a step to measure the amount of deformation of the automotive body (S15), the steps are carried out by a computer. Each of the above steps will be described below., <<Langkah akuisisi model analisis kelaiktabrakan> > The crashworthiness analysis model acquisition step (S1) is to acquire a crashworthiness analysis model of an automobile. In a first embodiment, as described above, a crashworthiness analysis model illustrated in Figure 2(a) as an example is acquired. <<Langkah analisis kelaiktabrakan> > The crashworthiness analysis step (S3) is to perform a crashworthiness analysis of the crashworthiness analysis model acquired in the crashworthiness analysis model acquisition step (S1). In a first embodiment, as illustrated for example in Figure 2, a crashworthiness analysis in which a collision (11) makes a side impact on a left side surface of the crashworthiness analysis model (1) in a width direction of the automotive body is performed in the crashworthiness analysis step (S3). Accordingly, in the crashworthiness analysis, crashworthiness analysis conditions such as a position, a direction, and a speed of impact at which the collision (11) makes the impact are appropriately set. < <Langkah untuk mengatur suatu titik pengukuran dari suatu jumlah dari deformasi bodi otomotif dan suatu titik acuan> > The steps to set a measurement point of the amount of deformation of the automotive body and a reference point (S5) are to set a measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured, and three reference points at a portion where the deformation of the automotive body is small. In a first embodiment, in the step of setting a measurement point of the amount of deformation of the automotive body and a reference point (S5), as illustrated in Figure 3, measurement points (P1) to (Ps) are set on a floor panel (5) included in a portion of the automotive body (3) of the crashworthiness analysis model (1). Furthermore, in the step of setting a measurement point of the amount of deformation of the automotive body and a reference point (S5), as illustrated in Figure 4(c), three reference points (Q1) to (Q3) are set on a portion of the right side surface (3a) of the crashworthiness analysis model (1). The portion where there is no or little deformation of the automotive body and where the three reference points are set in the crashworthiness analysis model may be, for example, a portion where there is no or little strain in the crashworthiness analysis model based on the results of the crashworthiness analysis in the crashworthiness analysis step (S3). In a first embodiment, as illustrated in Figure 2 described above, the crashworthiness analysis in which the impactor (11) is made to perform a side impact on the left side surface of the crashworthiness analysis model (1) is the target. Thus, as illustrated in Figures 4(a) and (b), the three reference points (Q1) to (Q3) are set on the portion of the right side surface (3a) where the strain from the deformation of the automotive body of the crashworthiness analysis model (1) is sufficiently small.Note that as a guide to a strain value when the reference points are set, the strain is made 1% or less. In addition, since the coordinates of the nodes of the crashworthiness analysis model are calculated in the crashworthiness analysis in the crashworthiness analysis step (S3), the measurement point and the three reference points can be set at the positions of the nodes in the crashworthiness analysis model in the step for setting the measurement point of the automotive body deformation amount and the reference point (S5). Furthermore, the steps to set the measurement points of the amount of automotive body deformation and the reference points (S5) can be executed before the crashworthiness analysis step (S3). < <Langkah untuk mengakuisisi koordinat-koordinat titik pengukuran dan koordinat-koordinat titik acuan pada suatu permulaan benturan> > The steps to acquire the coordinates of the measurement points and the coordinates of the reference points at the start of the impact (S7) are to acquire the coordinates of the measurement points and the coordinates of the three reference points in the crashworthiness analysis model at the start of the impact. In a first embodiment, the coordinates at the onset of impact from the measuring points (P1) to (Ps) arranged on the floor panel (5) of the crashworthiness analysis model (1) (FIG. 3) and the coordinates at the onset of impact from the reference points (Q1) to (Q3) arranged on the right side surface portion (3a) of the crashworthiness analysis model (1) (FIG. 4(c)) are acquired. Note that in a case where the nodes of the crashworthiness analysis model are set as the measuring points and the three reference points in the step of setting the measuring points of the automotive body deformation amount and the reference points (S5), the coordinates of each of the set nodes can be acquired. Furthermore, the step to acquire the coordinates of the measurement points and the coordinates of the reference points at the onset of impact (S7) can be executed before the crashworthiness analysis step (S3). < <Langkah untuk mengakuisisi koordinat-koordinat titik pengukuran dan koordinat-koordinat titik acuan setelah benturan> > The step for acquiring the coordinates of the measurement point and the coordinates of the reference point after the impact (S9) is to acquire the coordinates of the measurement point and the coordinates of the three reference points after the impact with respect to the crashworthiness analysis model after the elapse of a predetermined time from the start of the impact based on the results of the crashworthiness analysis in the crashworthiness analysis step (S3). In a first embodiment, the coordinates of the measurement points (P1) to (Ps) and the coordinates of the reference points (Q1) to (Q3) in the crashworthiness analysis model (1) after impact with the impactor (11) are acquired. < <Langkah untuk mengalkulasi suatu jarak titik acuan-titik pengukuran pada suatu permulaan benturan» A step for calculating a distance of the reference point of the measurement point at an impact initiation (S11) is to calculate a distance between the measurement point and each of the three reference points at the impact initiation using the coordinates of the measurement point and the coordinates of the three reference points at the impact initiation which coordinates were acquired in the step for acquiring the coordinates of the measurement point and the coordinates of the reference points at the impact initiation (S7). In the first embodiment, as illustrated in Figure 5(a), using the coordinates of the measuring point (P) and the coordinates of the three reference points (Q1), (Q2), and (Q3) in the crashworthiness analysis model (1) at the onset of impact, the distances at the onset of impact (L1), (L2), and (L3) respectively between the reference points (Q1), (Q2), and (Q3) and the measuring point (P) are calculated. Furthermore, in the first embodiment, since eight measuring points (P1) to (Ps) are arranged on the floor panel (5) as described above, the distances at the onset of impact (Li), (L2), and (L3) with reference points (Q1) to (Q3) are calculated for each of the measuring points (P1) to (P8). <<Langkah untuk mengakuisisi koordinat-koordinat titik pengukuran sebelum deformasi bodi otomotif> > The step to acquire the coordinates of the measurement points before the deformation of the automotive body (S13) is to acquire the coordinates of a position, which satisfies the same distance relationship as the distance at the beginning of the impact from each of the three reference points in the crashworthiness analysis model after the impact, as the coordinates of the measurement points before the deformation of the automotive body in the crashworthiness analysis model after the impact. In a first embodiment, as illustrated in Figure 5, the coordinates of a measuring point (R) before the deformation of the automotive body in the crashworthiness analysis model (1) after the impact are acquired based on the distances at the onset of the impact (L1), (L2), and (L3) between the measuring point (P) and the reference points (Qi), (Q2), and (Q3) at the onset of the impact. Furthermore, the coordinates of a measuring point (R) before the deformation of the automotive body can be acquired by the following procedure as illustrated in Figure 6 as an example. First, as illustrated in Figure 6(a), an intersection line (T12) between a spherical surface (Si) centered on a reference point (Q1) at a position after the impact and having the distance at the beginning of the impact (Li) as a radius and a spherical surface (S2) centered on a reference point (Q2) at a position after the impact and having the distance at the beginning of the impact (L2) as a radius is acquired. Next, as illustrated in Figure 6(a), the coordinates of an intersection point (C) between a spherical surface (S3) centered on a reference point (Q3) at the position after the impact and having the distance at the beginning of the impact (L3) as a radius and the intersection line (T12) are acquired as the coordinates of the measuring point (R) before the deformation of the automotive body. The coordinates of the measuring point (R) before deformation of the automotive body, the coordinates of which are acquired in such a way as to correspond to the coordinates of the measuring point (P) in the crashworthiness analysis model (1) where the automotive body makes a parallel movement or rotational movement by impact without deformation. Note that as illustrated in Figure 6(b), there is a case where two intersection points (C1) and (C2) exist on the spherical surface (S3) and the intersection line (T12). In this case, in the two intersection points (Ci) and (C2), one intersection point (such as intersection point (C2)) which is obviously absent in the crashworthiness analysis model (1) is excluded, and the coordinates of the other intersection point (such as intersection point (C1)) are acquired as the coordinates of the measurement point (R) before the deformation of the automotive body. In addition, in the first embodiment, since the measuring points (P1) to (Ps) are arranged as illustrated in Figure 3, the coordinates of the measuring points (R1) to (Rs) before the deformation of the automotive body are acquired for each of the measuring points (P1) to (P8) in the step of acquiring the coordinates of the measuring points before the deformation of the automotive body (S13). <<Langkah untuk mengukur suatu jumlah dari deformasi bodi otomotif> > The steps to measure an amount of automotive body deformation (S15) are to measure an amount of automotive body deformation at a measurement point by using the coordinates of the measurement point before the automotive body deformation and the coordinates of the measurement point after the automotive body deformation which coordinates are acquired for the crashworthiness analysis model after the impact. In the first embodiment, as illustrated in Figure 5(b), for the measurement points (P) ((P1) to (Ps)), the amount of deformation of the automotive body at each measurement point (P1) to (Ps) is measured by utilizing the coordinates of the measurement points (R) ((R1) to (Rs)) before the deformation of the automotive body in the crashworthiness analysis model (1) after the impact which coordinates are acquired in the step to acquire the coordinates of the measurement points before the deformation of the automotive body (S13) and the coordinates of the measurement points (P) ((P1) to (Ps)) after the deformation of the automotive body in the crashworthiness analysis model (1) after the impact (Figure 2(b)) which coordinates are acquired in the step to acquire the coordinates of the measurement points and the coordinates of the reference points after the impact (S9). As described above, according to a method for measuring an amount of deformation of an automotive body according to the first embodiment, in a crashworthiness analysis using a crashworthiness analysis model of an automobile, three reference points are provided in a portion where the deformation of the automotive body is small, and coordinates of the measurement points before the deformation of the automotive body in the crashworthiness analysis model after the impact are acquired by utilizing the distance relationship, at the beginning of the impact, between the three reference points and the measurement point at which the deformation amount of the automotive body is measured, wherein the amount of parallel movement and the amount of rotational movement of the entire crashworthiness analysis model resulting from the impact can be excluded, and the deformation amount of the automotive body at the measurement points can be measured.As a result, since the amount of automotive body deformation due to impact can be accurately acquired, the phenomenon of automotive body deformation due to impact can be understood, and improvement in crashworthiness and weight reduction of the automotive body become possible. <Program untuk mengukur suatu jumlah dari deformasi bodi otomotif> Note that the method for measuring the amount of automotive body deformation of the first embodiment can be configured as a program for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile wherein the program causes a computer to measure an amount of automotive body deformation of the automobile that is deformed as a result of an impact in the crashworthiness analysis of the automobile (hereinafter, the program for measuring an amount of automotive body deformation). A program for measuring the amount of deformation of an automotive body according to a first embodiment is to cause a computer to measure the amount of deformation of an automotive body of an automobile deformed by an impact in a crashworthiness analysis of an automobile, and cause said computer to execute a crashworthiness analysis model acquisition step to acquire a crashworthiness analysis model of an automobile, a crashworthiness analysis step to perform a crashworthiness analysis of the crashworthiness analysis model, a step to set a measurement point of an amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in said crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in said crashworthiness analysis model are set,a step for acquiring the coordinates of a measuring point and the coordinates of a reference point at the start of the impact in which step the coordinates of the measuring point and the coordinates of the three reference points in the crashworthiness analysis model at the start of the impact are acquired, a step for acquiring the coordinates of the measuring point and the coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the start of the impact based on a result of the crashworthiness analysis,a step to calculate a distance between reference points and measurement points at the start of the impact, in which step a distance to the measurement point at the start of the impact is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model at the start of the impact,a step for acquiring coordinates of a measurement point before deformation of an automotive body in which step the coordinates of a position satisfying the same distance relationship as the distances of each of the three reference points at the beginning of the impact in the crashworthiness analysis model after the impact are acquired as coordinates of the measurement point before deformation of the automotive body in the crashworthiness analysis model after the impact; and a step for measuring an amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing the coordinates of the measurement point before deformation of the automotive body and the coordinates of the measurement point after the impact which coordinates are acquired for the crashworthiness analysis model after the impact., As illustrated in Figure 1, a program for measuring the amount of deformation of an automotive body according to the first embodiment causes the computer to execute steps (S1) to (S15), whereby an effect similar to the effect for measuring the amount of deformation of an automotive body according to the first embodiment described above can be acquired. [Second incarnation] A method for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile according to a second embodiment of the present invention is for measuring an amount of automotive body deformation of an automobile deformed by an impact in a crashworthiness analysis of an automobile, and includes, as illustrated in Figure 7, a crashworthiness analysis model acquisition step (S1), a crashworthiness analysis step (S3), a step for setting a measurement point of an amount of automotive body deformation and a reference point (S5), a step for acquiring the coordinates of the measurement point and the coordinates of the reference point at an impact initiation (S7), a step for acquiring the coordinates of the measurement point and the coordinates of the reference point after the impact (S9), a step for calculating a distance of the reference point-measurement point after the impact (S21),a step to acquire the coordinates of the measurement points after deformation of the automotive body (S23), and a step to measure the amount of deformation of the automotive body (S25), these steps are performed by a computer., Herein, since the crashworthiness analysis model acquisition step (S1), the crashworthiness analysis step (S3), the step for setting a measurement point of an amount of automotive body deformation and a reference point (S5), the step for acquiring the measurement point coordinates and the reference point coordinates at an impact initiation (S7), the step for acquiring the measurement point coordinates and the reference point coordinates after the impact (S9) are the same as the steps in the first embodiment described above, the step for calculating a distance of the reference point-measurement point after the impact (S21), the step for acquiring the measurement point coordinates after the automotive body deformation (S23), and the step for measuring the amount of automotive body deformation (S25) will be described below. <<Langkah untuk mengalkulasi suatu jarak titik acuan-titik pengukuran setelah benturan> > The step for calculating a distance of reference points-measurement points after impact (S21) is to calculate a post-impact distance between each of the three reference points and a measurement point by using the coordinates of the measurement point and the coordinates of the three reference points in a crashworthiness analysis model after impact whose coordinates are acquired in the step for acquiring the coordinates of the measurement points and the coordinates of the reference points after impact (S9). In a second embodiment, as illustrated in Figure 8(a), by utilizing the coordinates of a measuring point (P) and the coordinates of three reference points (Q1), (Q2), and (Q3) in a crashworthiness analysis model (1) after a collision after the elapse of a predetermined time from an onset of collision, post-collision distances (L1), (L2), and (L3) between each of the reference points (Q1), (Q2), and (Q3) and the measuring point (P) are calculated. Furthermore, in a second embodiment, similarly to the first embodiment described above, since eight measuring points (P1) to (P8) are arranged on a floor panel (5) (see FIG. 3), post-impact distances (L1), (L2), and (L3) to reference points (Q1) to (Q3) are calculated for each measuring point (P1) to (P8). <<Langkah untuk mengakuisisi koordinat-koordinat titik pengukuran setelah deformasi bodi otomotif> > In the step of acquiring the coordinates of the measurement point after deformation of the automotive body (S23), the coordinates of a position satisfying the same distance relationship as a post-impact distance from each of the three reference points in the crashworthiness analysis model at the beginning of the impact are acquired as the coordinates of the measurement point after deformation of the automotive body in the crashworthiness analysis model at the beginning of the impact. In a second embodiment, as illustrated in Figure 8, the coordinates of a measuring point (R) after deformation of the automotive body in the crashworthiness analysis model (1) at the onset of the impact are acquired based on the post-impact distances (L1), (L2), and (L3) between the measuring point (P) and the reference points (Q1), (Q2), and (Q3) after the impact. Furthermore, the coordinates of the measuring point (R) after deformation of the automotive body can be acquired by the following procedure as illustrated in Figure 9 as an example. First, as illustrated in Figure 9(a), an intersection line (T12) between a spherical surface (S1) centered on a reference point (Q1) at a position at the beginning of the impact and having the post-impact distance (L1) as a radius and a spherical surface (S2) centered on a reference point (Q2) at a position at the beginning of the impact and having the post-impact distance (L2) as a radius is acquired. Next, as illustrated in Figure 9(b), the coordinates of an intersection point (C) between a spherical surface (S3) centered on a reference point (Q3) at a position at the beginning of the impact and having a post-impact distance (L3) as a radius and the intersection line (T12) are acquired as the coordinates of the measuring point (R) before the deformation of the automotive body. The coordinates of the measuring point (R) after deformation of the automotive body, the coordinates of which are acquired in a manner that corresponds to the coordinates of the measuring point (P) in the crashworthiness analysis model (1), where the automotive body is deformed by impact without parallel movement or rotational movement. Note that as illustrated in Figure 9(b), there is a case where two intersection points (C1) and (C2) are on the spherical surface (S3) and the intersection line (T12). In this case, in the two intersection points (C1) and (C2), one intersection point (such as intersection point (C2)) which is obviously absent in the crashworthiness analysis model (1) is excluded, and the coordinates of another intersection point (C1) are acquired as the coordinates of the measurement point (R) after the deformation of the automotive body. In addition, in the second embodiment, since the measuring points (P1) to (Ps) are arranged as illustrated in Figure 3, in the step of acquiring the coordinates of the measuring points after deformation of the automotive body (S23), the coordinates of the measuring points (R1) to (Rs) after deformation of the automotive body are acquired for each of the measuring points (P1) to (Ps). <<Langkah untuk mengukur suatu jumlah dari deformasi bodi otomotif> > The steps to measure an amount of automotive body deformation (S25) are to measure the amount of automotive body deformation at the measurement point by using the coordinates of the measurement point after the automotive body deformation and the coordinates of the measurement point at the beginning of the impact, which coordinates are acquired for the crashworthiness analysis model at the beginning of the impact. In a second embodiment, as illustrated in Figure 8(b), for measurement points (P) ( (P1) to (Ps)), the amount of deformation of the automotive body at each of the measurement points (P1) to (Ps) is measured by utilizing the coordinates of the measurement points (R) ((R1) to (Rs)) after deformation of the automotive body in the crashworthiness analysis model (1) at the beginning of the impact which coordinates are acquired in the step for acquiring the coordinates of the measurement point after deformation of the automotive body (S23) and the coordinates of the measurement points (P) ((P1) to (Ps)) before deformation of the automotive body in the crashworthiness analysis model (1) at the beginning of the impact (Figure 2(a)) which coordinates are acquired in the step for acquiring the coordinates of the measurement point and the coordinates of the reference point at the beginning of the impact (S7). As described above, according to the method for measuring the deformation amount of an automotive body according to the second embodiment, similarly to the method for measuring the deformation amount of an automotive body according to the first embodiment described above, three reference points are provided in a portion where the deformation amount of the automotive body is small, and the parallel movement amount and the rotational movement amount of the overall crashworthiness analysis model resulting from the impact are eliminated by utilizing the distance relationship between the three reference points and the measuring point at which the deformation amount of the automotive body is measured, whereby the deformation amount of the automotive body can be measured. As a result, a phenomenon of deformation of the automotive body resulting from the impact can be understood, and improvement in crashworthiness and weight reduction of the automotive body become possible. Furthermore, in the method for measuring the amount of deformation of an automotive body according to the second embodiment, the post-impact distance between the measuring point and the three reference points after deformation by the impact is calculated. The post-impact distance has an absolute value that is smaller than the distance at the beginning of the impact in the first embodiment described above. Thus, according to the method for measuring the amount of deformation of the automotive body according to the second embodiment, since an error in the coordinates of the measuring point after deformation of the automotive body whose measuring point satisfies the same distance relationship as the post-impact distance is small, the amount of deformation of the automotive body can be measured with high accuracy when compared with the first embodiment. <Program untuk mengukur suatu jumlah dari deformasi bodi otomotif> Note that the method for measuring an amount of automotive body deformation of the second embodiment may be configured as a program for measuring an amount of automotive body deformation in a crashworthiness analysis of an automobile wherein the program causes a computer to measure an amount of automotive body deformation of the automobile deformed as a result of an impact in the crashworthiness analysis of the automobile. A program for measuring the amount of deformation of an automotive body according to the second embodiment is to cause a computer to measure the amount of deformation of an automotive body of an automobile deformed by an impact in a crashworthiness analysis of an automobile, and cause said computer to execute a crashworthiness analysis model acquisition step to acquire a crashworthiness analysis model of an automobile, a crashworthiness analysis step to perform a crashworthiness analysis of the crashworthiness analysis model, a step to set a measurement point of an amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in said crashworthiness analysis model are set,a step for acquiring the coordinates of a measuring point and the coordinates of a reference point at an impact onset in which step the coordinates of the measuring point and the coordinates of the three reference points in the crashworthiness analysis model at the impact onset are acquired, a step for acquiring the coordinates of the measuring point and the coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired in relation to the crashworthiness analysis model after the elapse of a predetermined time from the impact onset based on a result of the crashworthiness analysis,a step for calculating a distance of reference points-measurement points after impact in which step a post-impact distance to the measurement point is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model after impact, a step for acquiring the coordinates of the measurement point after deformation of the automotive body in which step the coordinates of a position satisfying the same distance relationship as the post-impact distance of each of the three reference points in the crashworthiness analysis model at the beginning of impact are acquired as the coordinates of the measurement point after deformation of the automotive body by impact in the crashworthiness analysis model at the beginning of impact,and a step for measuring an amount of automotive body deformation in which step the amount of automotive body deformation at the measurement point is measured by utilizing the coordinates of the measurement point after the automotive body deformation and the coordinates of the measurement point at the start of the impact which coordinates are acquired for the crashworthiness analysis model at the start of the impact., As illustrated in Figure 7, in the program for measuring the amount of deformation of an automotive body according to the second embodiment, by executing steps (S1) to steps (S25), an effect similar to the effect of the method for measuring the amount of deformation of an automotive body according to the second embodiment described above can be acquired. [Examples] Since an analysis to confirm the effect of the present invention has been performed, a description thereof will be made in the following. In this example, as illustrated in Figure 2, an amount of deformation of the automotive body is measured according to the procedure described in the second embodiment described above for a side impact in which the impactor (11) impacts on a left side surface of the crashworthiness analysis model (1) in the width direction of the automotive body. In measuring the amount of deformation of the automotive body, first, as illustrated in Figure 3, measuring points (P1) to (Ps) at which the amount of deformation of the automotive body is measured are arranged on the floor panel (5) included in the automotive body (3) of the crashworthiness analysis model (1). Here, measuring points (P1) to (P3) are arranged at positions around a B-pillar on the floor panel (5), measuring points (P4) to (P7) are arranged at positions of a mounting hole in the floor panel (5), and (P8) is arranged at a position at the center of the mounting hole. In addition, as illustrated in Figure 4, the reference points (Q1) to (Q3) are set on a portion of the right side surface (3a) where the deformation of the automotive body is small in the side impact of the crashworthiness analysis model (1). Then, the crashworthiness analysis conditions such as a position, a direction, and an impact speed (= 29 km / h) at which the impactor (11) impacts the crashworthiness analysis model (1) are set, and the crashworthiness analysis is performed. Next, based on a result of the crashworthiness analysis, coordinates of measurement points (P1) to (P8) and coordinates of reference points (Q1) to (Q3) at an impact onset, and coordinates of measurement points (P1) to (P8) and coordinates of reference points (Q1) to (Q3) after the impact after 0.05 seconds have elapsed from the impact onset are acquired. Next, for each of the measurement points (P1) to (P8) on the floor panel (5) of the crashworthiness analysis model (1) after the impact, the post-impact distances to the reference points (Q1) to (Q3) are calculated, and the coordinates of the measurement points (R) after the deformation of the automotive body in the crashworthiness analysis model (1) at the beginning of the impact are acquired as illustrated in Figure 8. Then, the amount of deformation of the automotive body is measured from the coordinates of the measurement point after the deformation of the automotive body and the coordinates of the measurement point at the beginning of the impact. In this example, as the amount of deformation of the automotive body, the sum of the amount of deformation of the automotive body in a front-rear direction of the automotive body (X direction), a width direction of the automotive body (Y direction), and a vertical direction of the automotive body (Z direction), and the amount of deformation of the automotive body in the width direction of the automotive body (Y direction) are measured. The coordinates of the reference points (Q1) to (Q3) set in the crashworthiness analysis model (1) at the onset of impact and after impact after 0.05 seconds have elapsed from the onset of impact are illustrated in Table 1. Table 1 Reference point Coordinates at the start of impact Coordinates after impact (after 0.05 seconds) x / mm y / mm z / mm x / mm y / mm z / mm Q1 1731.54 791.2 47.62 1735.81 1022.62 61.93 Q2 1415.08 791.2 -16.69 1419.11 1010.39 -0.31 Q3 1074.82 791.2 47.62 1079.76 990.005 65.97 Furthermore, for each of the measuring points (P1) to (P8) arranged on the floor panel (5), the coordinates at the beginning of the impact and the coordinates after the impact after 0.05 seconds have elapsed from the beginning of the impact, the coordinates of the intersection point (C1) and the intersection point (C2) of the three spherical surfaces (S1) to (S3) having, as radii, the post-impact distances (L1) to (L3) to the three reference points (Q1) to (Q3) after the impact as illustrated in Figure 9, and a result of the amount of deformation of the automotive body at each of the measuring points (P1) to (P8) are illustrated in Table 2. Table 2 Measuring point At the start of impact (0 seconds) After impact (0.05 seconds) Amount of movement from [after impact - at the start of impact] (which includes parallel movement and rotational movement) X / mm Y / mm Z / mm X / mm Y / mm Z / mm X / mm Y / mm Z / mm Pi 1379.35 -656.427 18.0817 1459.26 -432.62 -25.0973 79.91 223.807 -43.179 P2 1466.23 -654.523 -5.55282 1547.49 -425.818 -42.787 81.26 228.705 -37.23418 P3 1552.26 -655.448 -9.18098 1634 -420,888 -45,6291 81.74 234,560 -36,4393 P4 866,334 -142,685 118,843 919,424 47,2564 94,58 53,09 189,9414 -24,263 P5 1423.8 -139,549 24.8178 1475.79 83.2486 -1.9489 52.79 222.7976 -26.7667 P6 881.726 -567.706 97.5166 957.083 -370.475 49.2849 75,357 197,231 -48.2317 P7 1423.74 -567.46 15.4916 1499.66 -342.453 -18.9543 75.92 225.007 -34.4459 P8 1146.8 -356.758 70.0599 1210.70 -149.466 37.1156 63.90 207.292 -32.9443 Table 2 (continued) Measuring point C1 intersection point C2 intersection point Amount of automotive body deformation X / mm Y / mm Z / mm X / mm Y / mm Z / mm XYZ / mm Y / mm P1 1383,688 2233,648 36,802 1383,688 -651,248 36,802 19,9 5,2 P2 1472,274 2232,17 19,544 1472,274 -649,77 19,544 26,2 4,8 P3 1558,959 2231,665 17,205 1558,959 -649,265 17,205 27,9 6,2 P4 867,498 1721,929 125,485 867,498 -139,529 125,485 7.4 3.2 P5 1425,678 1718,732 32,083 1425,678 -136,332 32,083 8.2 3.2 P6 884,653 2142,857 103,252 884,653 -560,457 103,252 9.7 7.2 P7 1428,487 2145,381 38,386 1428,487 -562,981 38,386 23.8 4.5 P8 1149.061 1935.63 81.36 1149,061 -353,23 81,36 12,1 3,5 From the results of Table 2, it is clear that, in the intersection point (Ci) and the intersection point (C2), the intersection point (C2) is a point that is not located in the crashworthiness analysis model (i) because the Y coordinates of the intersection point (C2) are all minus (-) and substantially the same as the Y coordinates at the beginning of the impact. Thus, the intersection point (Ci) is determined 10 as the measurement point (R) after the deformation of the automotive body in the crashworthiness analysis model (i) at the beginning of the impact. Furthermore, as illustrated in Table 2, the parallel motion and rotational motion of the crashworthiness analysis model (1) resulting from the impact are excluded from the 15 deformations of the automotive body at the measurement points (P1) to (Ps), and it becomes clear that the amount of deformation of the automotive body is on the order of 10 mm or less in both the total deformation in the XYZ directions and the deformation in the width direction of the automotive body. Industrial Applicability According to the present invention, in a crashworthiness analysis using a crashworthiness analysis model of an automobile, it is possible to provide a method for measuring an amount of deformation of the automotive body and a program for measuring the amount of deformation of the automotive body in the crashworthiness analysis of the automobile wherein by the method and program the amount of deformation of the automotive body from which an amount of movement resulting from parallel movement or rotational movement by an impact of the crashworthiness analysis model is removed can be measured. List of Reference Marks Crashworthiness Analysis Model Automotive Body 3a Right Side Surface Portion Floor Panels Collider C, Ci, and C2 Intersection Points P, Pi, P2, P3, P4, P5, P6, P7, and P8 Measurement Points Q, Q1, Q2, and Q3 Reference Points S1, S2, and S3 Spherical Surfaces T12 Intersection Line

Claims

1. A method for measuring an amount of deformation of an automotive body in a crashworthiness analysis of an automobile deformed by impact in a crashworthiness analysis, said method being executed by a computer and including: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of a reference pointmeasurement point at the beginning of the impact in which step a distance to the measurement point at the beginning of the impact is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model at the beginning of the impact; a step for acquiring the coordinates of the measurement point before deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the distance of each of the three reference points at the beginning of the impact in the crashworthiness analysis model after the impact are acquired as the coordinates of the measurement point before deformation of the automotive body in the crashworthiness analysis model after the impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing the coordinates of the measurement point before the deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model after the impact, and the coordinates of the measurement point after the impact.; 2. A method for measuring an amount of deformation of an automotive body in a crashworthiness analysis of an automobile deformed by impact in a crashworthiness analysis, said method being executed by a computer and including: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of a reference pointmeasurement point after impact in which step a post-impact distance to the measurement point is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model after impact; a step for acquiring the coordinates of the measurement point after deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the post-impact distance of each of the three reference points in the crashworthiness analysis model at the beginning of impact are acquired as the coordinates of the measurement point after deformation of the automotive body by impact in the crashworthiness analysis model at the beginning of impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing the coordinates of the measurement point after deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model at the start of the impact, and the coordinates of the measurement point at the start of the impact.; 3. A program for causing a computer to measure an amount of deformation of an automotive body of an automobile deformed by an impact in a crashworthiness analysis, said program causing said computer to execute: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of a reference pointmeasurement point at the beginning of the impact in which step a distance to the measurement point at the beginning of the impact is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model at the beginning of the impact; a step for acquiring the coordinates of the measurement point before deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the distance of each of the three reference points at the beginning of the impact in the crashworthiness analysis model after the impact are acquired as the coordinates of the measurement point before deformation of the automotive body in the crashworthiness analysis model after the impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing the coordinates of the measurement point before the deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model after the impact, and the coordinates of the measurement point after the impact.; 4. A program for causing a computer to measure an amount of deformation of an automotive body of an automobile deformed by an impact in a crashworthiness analysis, said program causing said computer to execute: a crashworthiness analysis model acquisition step for acquiring a crashworthiness analysis model of the automobile; a crashworthiness analysis step for performing a crashworthiness analysis of the crashworthiness analysis model; a step for setting a measurement point of the amount of deformation of the automotive body and reference points in said step the measurement point at which the amount of deformation of the automotive body in the crashworthiness analysis model is measured and three reference points in a portion with no or little deformation of the automotive body in the crashworthiness analysis model are set;a step for acquiring coordinates of a measuring point and coordinates of a reference point at an impact initiation in which step the coordinates of the measuring point and the coordinates of three reference points in the crashworthiness analysis model at the impact initiation are acquired; a step for acquiring coordinates of the measuring point and coordinates of the reference point after the impact in which step the coordinates of the measuring point and the coordinates of the three reference points after the impact are acquired for the crashworthiness analysis model after the elapse of a predetermined time from the impact initiation based on a result of the crashworthiness analysis;a step for calculating a distance of a reference pointmeasurement point after impact in which step a post-impact distance to the measurement point is calculated for each of the three reference points by utilizing the coordinates of the measurement point and the coordinates of the three reference points in the crashworthiness analysis model after impact; a step for acquiring the coordinates of the measurement point after deformation of the automotive body in which step the coordinates of a position satisfying a distance relationship equal to the post-impact distance of each of the three reference points in the crashworthiness analysis model at the beginning of impact are acquired as the coordinates of the measurement point after deformation of the automotive body by impact in the crashworthiness analysis model at the beginning of impact;and a step for measuring the amount of deformation of the automotive body in which step the amount of deformation of the automotive body at the measurement point is measured by utilizing the coordinates of the measurement point after deformation of the automotive body, which coordinates are acquired for the crashworthiness analysis model at the start of the impact, and the coordinates of the measurement point at the start of the impact.;

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