# US 2014/0195212 A1 · Motion analysis apparatus and motion analysis method

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- Number: US 2014/0195212 A1
- Document ID: US20140195212A1
- Status: Published application
- Kind: A1
- Application number: 14/203,701
- Filed: 2014-03-11
- Published: 2014-07-10
- Earliest claimed: 2011-09-12
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Keita OGASAWARA; Masaki KAZAMA
- Web page: https://patentgrep.com/patent/US20140195212A1

## CPC

- G06F 30/25: using particle-based methods
- G06F 30/20: Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30)
- G06F 2111/10: Numerical modelling
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A motion analysis apparatus includes a storage section configured to store data representing a plurality of particles representing an object; a partitioning process section configured to partition a particle of interest among the plurality of particles and to store data representing a plurality of partitioned particles obtained by partitioning the particle of interest into the storage section if a predetermined uneven distribution relationship exists between the particle of interest and other particles existing within a predetermined range having the particle of interest at a center of the predetermined range; and a motion analysis section configured to analyze the motion of the object depending on a type of the object using the data representing the plurality of partitioned particles stored in the memory storage section.

## Claims

### Claim 1

A motion analysis apparatus comprising:
a storage section configured to store data representing a plurality of particles representing an object;
a partitioning process section configured to partition a particle of interest among the plurality of particles and to store data representing a plurality of partitioned particles obtained by partitioning the particle of interest into the storage section if a predetermined uneven distribution relationship exists between the particle of interest and other particles existing within a predetermined range having the particle of interest at a center of the predetermined range; and
a motion analysis section configured to analyze the motion of the object depending on a type of the object using the data representing the plurality of partitioned particles stored in the storage section.

### Claim 2 (depends on 1)

The motion analysis apparatus as claimed in claim 1, wherein the predetermined uneven distribution relationship is a relationship where the number of the other particles existing within the predetermined range having the particle of interest at the center is less than a predetermined number.

### Claim 3 (depends on 1)

The motion analysis apparatus as claimed in claim 1, wherein the predetermined uneven distribution relationship is a relationship where the particle of interest and the other particles exist on substantially the same plane or on substantially the same line.

### Claim 4 (depends on 1)

The motion analysis apparatus as claimed in claim 1, wherein the partitioning process section stores the data representing the plurality of partitioned particles obtained by partitioning the particle of interest into the storage section if a value of a determinant of a re-normalization matrix having values of a function representing distribution of the particle of interest and the other particles as components is greater than or equal to a predetermined value.

### Claim 5 (depends on 4)

The motion analysis apparatus as claimed in claim 4, wherein the re-normalization matrix is
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where W represents a kernel function, h represents an influential radius of the particle of interest, r (vector representation) represents a position vector of the particle of interest, (x, y, z) represent vector components of the particle of interest, rb (vector representation) represents a position vector of each of the other particles, and (xb, yb, zb) represent vector components of each of the other particles.

### Claim 6 (depends on 1)

The motion analysis apparatus as claimed in claim 1, wherein, if the predetermined uneven distribution relationship exists between the particle of interest and the other particles, the partitioning process section partitions the particle of interest in a direction perpendicular to a direction where the predetermined uneven distribution relationship exists between the particle of interest and the other particles.

### Claim 7 (depends on 1)

The motion analysis apparatus as claimed in claim 1, wherein the partitioning process section determines positions of the plurality of partitioned particles, and then, determines mass of the plurality of partitioned particles so that a difference between density functions before and after the partitioning of the partitioned particles is small.

### Claim 8

A motion analysis method for analyzing motion of a plurality of particles representing an object, the method being executed by a computer, the method comprising:
partitioning data representing a particle of interest among the plurality of particles into data representing a plurality of partitioned particles obtained by partitioning the particle of interest if a predetermined uneven distribution relationship exists between the particle of interest and other particles existing within a predetermined range having the particle of interest at a center of the predetermined range; and
analyzing the motion of the object depending on a type of the object, and using the data representing the plurality of partitioned particles.

### Claim 9

A computer-readable recording medium having a program stored therein for causing a computer to execute a motion analysis method for analyzing motion of a plurality of particles representing an object, the method comprising:
partitioning data representing a particle of interest among the plurality of particles into data representing a plurality of partitioned particles obtained by partitioning the particle of interest if a predetermined uneven distribution relationship exists between the particle of interest and other particles existing within a predetermined range having the particle of interest at a center of the predetermined range; and
analyzing the motion of the object depending on a type of the object, and using the data representing the plurality of partitioned particles.