JP2015197847A - Work analysis system, work analysis method, and work analysis program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work analysis system capable of shortening time required for the measurement or analysis of a work in comparison with a conventional manner, and obtaining a concrete determination result with respect to the work.SOLUTION: A work analysis system 1 includes: a position arithmetic part 130 for acquiring position information indicating the three-dimensional position of a transmitter in association with time on the basis of a signal wirelessly transmitted from a transmitter 110 mounted on a worker, and received by a receiver 120 arranged in a work space; a storage part 140 for storing work position information in which a position where the work should be executed is preliminarily defined and standard work time information in which time when the work should be executed is preliminarily defined; a work time arithmetic part 150 for calculating a parameter indicating a positional relation between the position of the transmitter and the position where the work should be executed, and for specifying the start point and end point of the executed work on the basis of the parameter, and for calculating a difference in time corresponding to the start point and end point as work time; and a determination part 160 for determining the work time on the basis of the standard work time.

Description

  The present invention relates to a work analysis system, a work analysis method, and a work analysis program for analyzing work.

  In the field improvement of a production line or the like, a method for examining an improvement plan based on an analysis result obtained by analyzing work performed by an operator is known. Conventionally, work analysis has been done by video-taking work on the current line, measuring each work time while observing the image for each worker, each work, and each part, line balance, work effectiveness, etc. This was done by counting each part. Based on the results of this aggregation, we will consider improvement plans such as reviewing individual work and streamlining lines.

  For example, in Patent Document 1, a marker is attached to an operator for shooting, and an image obtained thereby is analyzed to obtain a trajectory to which the marker has moved, and the trajectory is compared with features of a reference trajectory. A work analysis device for specifying contents is disclosed.

JP 2000-180162 A

  In the case of the conventional method described above, a long time is required for video shooting, time measurement, and analysis work. In particular, the analysis work by observing the video taken requires more than twice the shooting time. For this reason, under the present circumstances, it took a very long time to analyze the work, consider the improvement plan, present it, and implement it. However, prompt proposals for improvement proposals are required at production lines and other sites, so in order to present improvement proposals within a limited time, work is measured and analyzed in a short time, and improvements are made at an early stage. It is better to start studying the draft.

  Also, when observing the video, even if it is known that there is a wasteful movement in the work, it is possible to specify what kind of waste is specifically occurring or determine whether the work efficiency is appropriate or not. It was difficult to obtain a specific determination result for the work performed by the worker.

  The present invention has been made in view of the above, and can reduce the time required for measurement and analysis of work compared to the conventional technique, and can obtain a specific determination result for the work performed by the worker. An object is to provide a work analysis system, a work analysis method, and a work analysis program.

  In order to solve the above-described problems and achieve the object, a work analysis system according to the present invention is wirelessly transmitted from a transmitter attached to a work detection target and disposed in a space in which the work is executed. Based on a signal received by a receiver, a position information acquisition unit that acquires position information representing a three-dimensional position of the transmitter in association with time, and a position at which the operation is to be performed are defined in advance. Based on the work position information and the position information, a parameter representing a positional relationship between the position where the work should be performed and the position of the detection target is calculated, and the start point of the work performed based on the parameter is calculated. And an end point, a work time calculation unit that calculates a difference in time corresponding to each of the start point and the end point as a work time required for the work, and a time when the work should be executed in advance Based on the definition by standard work time information, characterized in that it and a determination unit for determining the operation time.

  In the work analysis system, the work position information includes at least a first area centered on a position where the work should be started and a second area centered on a position where the work should be finished. Including the defined information, and the work time calculation unit specifies a start point of the work performed based on the parameter for the first area and executes based on the parameter for the second area. The end point of the performed work is specified.

  In the work analysis system, the parameter represents a distance between a boundary surface of each of the first and second regions and a position of the detection target.

  In the work analysis system, the work time calculation unit specifies the start point and the end point based on a sign of the parameter.

  In the work analysis system, the work time calculation unit specifies the start point and the end point based on an extreme value of the parameter.

  The work analysis system further includes a trajectory creation unit that creates a trajectory of movement of the transmitter based on the position information.

  In the work analysis system, the trajectory creation unit further includes a display unit that acquires a route on which the work should be performed and displays the trajectory and the route on a screen.

  In the work analysis system, the trajectory creation unit further acquires a route on which the work should be executed, and determines the trajectory based on the route.

  The work analysis system further includes a display unit that displays the trajectory on a screen and highlights an area where a difference between the route and the trajectory is a predetermined value or more.

  In the work analysis system, the trajectory creation unit extracts a work in which a difference between the route and the trajectory is a predetermined value or more.

  The work analysis system includes a transmitter that is mounted on the detection target and wirelessly transmits a signal, a receiver that is disposed in a space in which the work is performed, and that receives the signal transmitted from the transmitter; The wireless communication means further comprising:

  In the work analysis system, the wireless communication unit transmits and receives an ultrasonic signal as the signal.

  In the work analysis system, the wireless communication unit performs communication via a wireless LAN.

  The work analysis method according to the present invention is a work analysis method by a work analysis system, wherein a signal is transmitted wirelessly from a transmitter attached to a work detection target, and is received in a space where the work is performed. A signal transmitting / receiving step for receiving the signal by a transmitter, and a position information acquiring step for acquiring, based on the signal received in the signal transmitting / receiving step, position information representing a three-dimensional position of the transmitter in association with time And a parameter representing a positional relationship between the position where the work should be performed and the position of the detection target based on the work position information in which the position where the work should be performed is defined in advance and the position information. In addition, the start point and end point of the executed work are specified based on the parameter, and the difference in time corresponding to the start point and the end point is set in the work. A work time calculation step for calculating the work time, and a determination step for determining the work time based on standard work time information defined in advance as a time for which the work should be performed. .

  The work analysis program according to the present invention is based on a signal transmitted wirelessly from a transmitter attached to a work detection target and received by a receiver arranged in a space in which the work is executed. A position information acquisition step for acquiring position information representing a three-dimensional position in association with time, work position information in which a position at which the work should be performed is defined in advance, and the position information. A parameter representing a positional relationship between the position to be executed and the position of the detection target is calculated, and based on the parameter, the start point and end point of the executed work are specified, and the start point and end point are respectively corresponded A work time calculation step for calculating a time difference as a work time required for the work, and a standard work time information in which the time for the work to be executed is defined in advance. There are, characterized in that to execute a determining step of determining the operation time, to the computer.

  According to the present invention, since the start point and end point of the executed work are specified based on the parameter representing the positional relationship between the position where the work should be performed and the position of the work detection target, it is possible to measure and analyze the work. The time required can be shortened compared to the conventional method, and the determination result for the work performed by the worker can be obtained specifically and automatically. Thereby, even within a limited time, it is possible to efficiently consider and present an improvement plan.

FIG. 1 is a block diagram showing a configuration example of a work analysis system according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing a work site to which the work analysis system shown in FIG. 1 is applied. FIG. 3 is a table showing an example of the data structure of log data output from the position calculation unit shown in FIG. FIG. 4 is a table showing an example of the data structure of the work content information stored in the work content storage unit shown in FIG. FIG. 5 is a table showing an example of the data structure of the work position information stored in the work position storage unit shown in FIG. FIG. 6 is a schematic diagram showing a situation where an operator is working. FIG. 7 is a schematic diagram for explaining the definition of the area including the start point, the passing point, and the end point of the work. FIG. 8 is a table showing an example of the data structure of the standard work time information stored in the standard work time storage unit shown in FIG. FIG. 9 is a flowchart showing the work analysis method according to the first embodiment of the present invention. FIG. 10 is a flowchart showing the work time calculation process shown in FIG. FIG. 11 is a schematic diagram for explaining the definition of the pseudorange. FIG. 12 is a schematic diagram showing the relative position of the transmitter with respect to the start point region, the pass point region, or the end point region. FIG. 13 is a table showing an example of calculating pseudoranges. FIG. 14 is a flowchart showing the pseudo distance calculation process shown in FIG. FIG. 15 is a table showing calculation results of pseudoranges for a series of log data. FIG. 16 is a table showing the determination result of the work time. FIG. 17 is a block diagram showing a configuration example of a work analysis system according to Embodiment 2 of the present invention. FIG. 18 is a flowchart showing a work analysis method according to Embodiment 2 of the present invention. FIG. 19 is a flowchart showing the trajectory creation process shown in FIG. FIG. 20 is a schematic diagram illustrating a display example of a trajectory. FIG. 21 is a schematic diagram illustrating a display example of a trajectory. FIG. 22 is a table showing a display example of the trajectory determination result.

  Hereinafter, a work analysis system, a work analysis method, and a work analysis program according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to these embodiments. Moreover, in description of each drawing, the same code | symbol is attached | subjected and shown to the same part.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a work analysis system according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing a work site to which the work analysis system shown in FIG. 1 is applied. The work analysis system 1 according to the first embodiment is a system that analyzes the work of the worker 2 who performs processing, assembly, and the like. More specifically, the time (work time) required for the work performed by the worker is shown. This is a measurement system.

  As shown in FIG. 1, the work analysis system 1 includes a transmitter 110 that wirelessly transmits a signal, a receiver 120 that receives a signal transmitted from the transmitter 110, and outputs a detection signal of the signal, and a reception Based on the detection signal output from the transmitter 120, a position calculation unit 130, which is a position information acquisition unit that acquires position information representing the three-dimensional position of the transmitter 110 in association with time, a storage unit 140, and a position calculation Based on the position information calculated by the unit 130, a work time calculation unit 150 that calculates time (hereinafter referred to as “work time”) required by the worker and a work time calculated by the work time calculation unit 150 are determined. The determination unit 160, the input unit 170 used for inputting instructions and information to the work analysis system, the display unit 180 for displaying various information and calculation results, and the like. And a control unit 190 for controlling the.

  The transmitter 110 and the receiver 120 are wireless communication units that transmit and receive information via ultrasonic signals. The transmitter 110 is attached to a work detection target such as the worker 2 or a tool or work object handled by the worker 2, and an ultrasonic signal including unique identification information (ID number) of the transmitter 110 is transmitted at a predetermined cycle. Send with. FIG. 2 shows an example in which one transmitter 110 is attached to each of the left and right wrists of the worker 2. In addition, the attachment location and the number of attachments of the transmitter 110 are not limited to two. For example, one or a plurality of transmitters 110 may be attached only to the body of the worker 2, or the transmitters 110 may be attached to both the body of the worker 2 and the work object. Even if a plurality of transmitters 110 are used, in the receiver 120, from which transmitter 110 the received ultrasonic signal is transmitted based on the identification information included in the ultrasonic signal. Can be identified.

  A plurality (three in FIG. 2) of receivers 120 are installed at predetermined positions in a space where work is performed, such as a wall or a ceiling of a work site. Each receiver 120 receives the ultrasonic signal transmitted from the transmitter 110 and converts it into an electrical signal, and outputs this electrical signal as a detection signal of the transmitter 110. The detection signal output from each receiver 120 is taken into the position calculation unit 130 via a network NW1 such as a wired or wireless LAN or directly.

  Note that the installation location and the number of installations of the receiver 120 are not particularly limited as long as the position of the transmitter 110 can be detected three-dimensionally, and may be appropriately determined according to the configuration of the work site, the movable range of the worker 2, and the like. . In Embodiment 1, an example in which the transmitter 110 and the receiver 120 that transmit and receive ultrasonic signals are used as wireless communication means will be described, but the configuration of the wireless communication means is not limited to this. For example, a wireless LAN system that wirelessly transmits and receives electrical signals between a transmitter and a receiver may be used.

  The position calculation unit 130 holds the three-dimensional position information of each receiver 120 in advance, and based on the intensity of the detection signal captured from each receiver 120 and the position information of each receiver 120, the transmitter 110 three-dimensional positions are calculated in real time. The position calculation unit 130 associates the position information indicating the position of the transmitter 110 calculated in this way with the time at that time, and sequentially outputs it as log data.

  FIG. 3 is a table showing an example of the data structure of log data output from the position calculation unit 130. The log data structure 200 shown in FIG. 3 includes a time data storage unit 201 that stores time data indicating the timing at which the position of the transmitter 110 is calculated, and an ID storage unit 202 that stores the ID number of the transmitter 110. The x-coordinate data storage unit 203 that stores the x-coordinate data of the transmitter 110, the y-coordinate data storage unit 204 that stores the y-coordinate data of the transmitter 110, and the z-coordinate data of the transmitter 110 are stored. a z-coordinate data storage unit 205. When a plurality of transmitters 110 are used, an ID storage unit and x, y, and z coordinate data storage units are provided for each transmitter 110.

  The transmitter 110, the receiver 120, and the position calculation unit 130 constitute a data construction system that constructs data for performing work analysis. The data construction system may be realized using a commercially available three-dimensional positioning system. As an example, a three-dimensional position measurement system using ultrasonic waves that can measure the position of the transmitter 110 with an error of several tens of millimeters is known.

  The storage unit 140 includes, for example, a semiconductor memory such as a flash memory, a RAM, and a ROM, a recording medium such as an HDD, and a writing / reading device that writes and reads information on the recording medium. The storage unit 140 stores various setting information for the work time calculation unit 150 and the determination unit 160 to perform various calculations based on the log data output from the position calculation unit 130. Specifically, the storage unit 140 stores a work content storage unit 141 that stores work content information that defines the content and order of work to be performed by the worker, and each work defined by the work content information is executed. A work position storage unit 142 that stores work position information that defines a position to be processed, and a standard work time storage unit 143 that stores standard work time information that defines a standard work time of each work defined by the work content information. And an analysis result storage unit 144 that stores the analysis result of the work analyzed based on the log data output from the position calculation unit 130.

  FIG. 4 is a table showing an example of the data structure of work content information stored in the work content storage unit 141. Here, in the production site, for example, each process such as assembly of parts is divided into simplified operations such as “setting part A” and “removing screw B”, and described according to the work order. A working standard book is prepared. The work content information stored in the work position storage unit 142 is constructed based on such a work standard document. As shown in FIG. 4, the work content storage unit 141 includes a work order storage unit 211 in which the work order is stored, and a work content storage unit 212 in which the content of each work is stored. The stored information constitutes work content information 210.

  FIG. 5 is a table showing an example of the data structure of the work position information stored in the work position storage unit 142. As shown in FIG. 5, the information stored in the work position storage unit 142 is associated with the information stored in the work order storage unit 211 and the work content storage unit 212. The work position storage unit 142 stores an ID storage unit 221 that stores the ID number of the transmitter 110 whose position is to be measured in each work, and a start point that stores coordinates of the start point, passing point, and end point of each work. A coordinate storage unit 222, a passing point coordinate storing unit 223, an end point coordinate storing unit 224, a starting point margin storing unit 225 for storing margins provided for the start point, passing point, and end point of each work, a passing point Including the margin storage unit 226 and the end point margin storage unit 227, the information stored in these storage units constitutes the work position information 220.

  Here, the definition method of the start point, the passing point, and the end point of each work will be described with reference to FIGS. Here, the start point is a position where each work should be started, the passing point is a position that should be passed during the work of each work, and the end point is the end of each work. It is a position to be. FIG. 6 is a schematic diagram showing a situation where the worker 2 is working. FIG. 7 is a schematic diagram for explaining the definition of the area centered on the start point, the passing point, and the end point of the work. In FIG. 6, among the transmitters 110 attached to the left and right wrists of the worker 2, the ID number of the transmitter 110 attached to the right hand is 1060, and the ID number of the transmitter 110 attached to the left hand is 1061. And

For example, as shown in FIG. 6, in the work order 1 "setting part A" work (see FIG. 5), the right hand of the worker 2 starts moving from the position P1, passes through the position P2, and moves to the position P3. It will end when it reaches. In this case, the definition of the start point of the work coordinate _{(x 0, y 0, z} 0) as the position P1 of the coordinates (1281,766,1443) is, as a passing point coordinates _{(x 0, y 0, z} 0) The coordinates (1465, 596, 1571) of the position P2 are defined, and the coordinates (948, 603, 1580) of the position P3 are defined as the coordinates (x ₀ , y ₀ , z ₀ ) of the end point. When the coordinates of the transmitter 110 with the ID number 1060 attached to the right hand of the worker 2 sequentially match the coordinates of the start point, the passing point, and the end point defined in this way, the work is started, It can be determined that it has passed through the position and ended.

However, in practice, it is difficult to precisely match the coordinates of the transmitter 110 with a specific point in the three-dimensional space. Therefore, in the first embodiment, as shown in FIG. 7, these start point, passing point, and end point coordinates (x ₀ , y ₀ , z ₀ ) are given a margin according to the work contents. An area is defined. This region is a rectangular parallelepiped region in which margins (Δx, Δy, Δz) are added in the ± direction for each coordinate (x ₀ , y ₀ , z ₀ ). For example, in the case of work of work order 1, areas (1281 ± 70, 766 ± 70, 1443 ± 70) in which margins (70, 70, 70) are provided with respect to the coordinates (1281, 766, 1443) of the start point are It is defined as a starting point area (first area). Similarly, an area (1465 ± 70, 596 ± 150, 1571 ± 200) provided with a margin (70,150,200) with respect to the coordinates (1465,596,1571) of the passing point is defined as a passing point area. Is done. Further, an area (948 ± 120, 603 ± 150, 1580 ± 150) provided with a margin (120, 150, 150) with respect to the coordinates (948, 603, 1580) of the end point is the end point area (second area). ). When the transmitter 110 enters and exits a region having a width centered on each of the start point, the pass point, and the end point, the transmitter 110 is considered to have passed through the start point, the pass point, and the end point.

  In the work position information 220, the position where each work is to be executed is basically defined by the start point, the passing point, and the end point. In the case of work consisting only of movement in one direction, such as the “return driver C” work in FIG. 6, the work position may be defined by the start point and the end point, and the passing point may be omitted. Alternatively, a plurality of passing points may be defined in one operation.

  Further, instead of the position of a specific part (for example, the right hand) of the worker 2, the starting point and the passage are determined depending on the position at which the tool used for the work, the part that is the work object, and the product assembled by the work are arranged. Points and end points may be defined.

  FIG. 8 is a table showing an example of the data structure of the standard work time information stored in the standard work time storage unit 143. As shown in FIG. 8, the standard work time storage unit 142 is associated with information stored in the work order storage unit 211 and the work content storage unit 212 and stores standard work times set for each work. A standard work time storage unit 231 is included. The information stored here constitutes standard work time information 230.

  Referring to FIG. 1 again, the work time calculation unit 150 calculates the work time based on the log data output from the position calculation unit 130. More specifically, the work time calculation unit 150 takes in the log data output from the position calculation unit 130 via a network NW2 such as a wired or wireless LAN, and stores the work position information 220 stored in the work position storage unit 141. With reference, the start point and end point of the work performed by the worker are specified, and the time difference corresponding to the start point and the end point is calculated as the work time.

  The determination unit 160 determines whether the work time of each work calculated by the work time calculation unit 150 is within an appropriate range. More specifically, the determination unit 160 refers to the standard work time information 230 stored in the standard work time storage unit 143 and determines whether the work time of each work is within the standard work time range. .

  The input unit 170 includes input devices such as a keyboard, various buttons, and various switches, and a pointing device such as a mouse, and inputs a signal corresponding to an operation performed from the outside by the user to the control unit 190.

  The display unit 180 is a display device such as a CRT display or a liquid crystal display, for example. Under the control of the control unit 190, the display unit 180 displays information such as log data output from the position calculation unit 130 and a determination result by the determination unit 160. indicate. Note that the input unit 170 and the display unit 180 may be integrally configured by a touch panel to which a signal is input by an operation on the display screen.

  The control unit 190 gives instructions to each unit constituting the work analysis system 1, transfers data, and the like, and comprehensively controls the operation of the work analysis system 1.

  These storage unit 140, work time calculation unit 150, and determination unit 160 constitute a data operation system that performs work analysis using data constructed by the data construction system. The data operation system can be realized using, for example, a computer including a CPU having calculation and control functions. In this case, the CPU executes various calculations and controls by reading the calculation program and control program stored in the storage unit 140.

  Note that the configuration of the work analysis system according to the first embodiment is not limited to the configuration illustrated in FIG. For example, the functions of the position calculation unit 130, the work time calculation unit 150, and the determination unit 160 may be executed by a single computer, or these functions may be distributed to a plurality of computers connected via a network. It may be executed. The storage unit 140 may be configured by a server provided on the network. In this case, the work time calculation unit 150 and the determination unit 160 fetch various information from the server via the network and perform calculations.

Next, the work analysis method according to the first embodiment will be described. FIG. 9 is a flowchart showing the work analysis method according to the first embodiment.
First, in step S100, an ultrasonic signal is transmitted from the transmitter 110. In response to this, the receiver 120 receives the ultrasonic signal and outputs a detection signal of the ultrasonic signal (step S200).

  In subsequent step S300, the position calculation unit 130 captures the detection signal output from the receiver 120, and stores in advance the distance between the transmitter 110 and each receiver 120 estimated from the intensity of the detection signal. The position of the transmitter 110 is calculated based on the position information of each receiver 120.

  In subsequent step S400, the position calculation unit 130 outputs position information indicating the position of the transmitter 110 as log data in association with the ID number of the transmitter 110 and the calculation time of the position information (see FIG. 3).

  In subsequent step S500, the work time calculation unit 150 sequentially fetches the log data output from the position calculation unit 130, the log data, the work content information 210 (see FIG. 4) stored in the storage unit 140, and the work position. Based on the information 220 (see FIG. 5), the work time required for each work is calculated.

FIG. 10 is a flowchart showing a work time calculation process.
First, in step S <b> 510, the work time calculation unit 150 takes in log data output from the position calculation unit 130.

  In subsequent step S520, the work time calculation unit 150 calculates a pseudorange for the acquired log data. The pseudorange is a start point area, a passing point area, and an end point area (hereinafter, simply referred to as an area) set for each work, and the transmitter 110 is outside or inside the area. It is the parameter introduced in order to determine in which.

  Here, the operation of the worker 2 can be divided by the positional relationship between the transmitter 110 and the start point region, the pass point region, and the end point region defined in the work position information 220. For example, when the transmitter 110 enters a start point area in a certain work and then leaves the start point area, it can be estimated that the work has started. Further, when the transmitter 110 enters the end point area in the work and then leaves the end point area, it can be estimated that the work is finished. Therefore, in the first embodiment, the entry / exit of the transmitter 110 with respect to each region is determined using pseudoranges, and the operation of the worker 2 is divided based on the determination result.

式（１）において、表式Ｍａｘ（ａ１，ａ２，…）は、括弧内の数値ａ１、ａ２、…のうちの最大値を示し、表式Ｍｉｎ（ａ１，ａ２，…）は、括弧内の数値ａ１、ａ２、…のうちの最小値を示す。 FIG. 11 is a schematic diagram for explaining the definition of the pseudorange. As shown in FIG. 11, the pseudo distance D is the coordinates (x ₀ , y ₀ , z ₀ ) of the center point C representing the coordinates (x, y, z), the start point, the passing point, or the end point of the transmitter 110. , And margins (Δx, Δy, Δz) (see FIG. 7) are given by the following equation (1).

In the expression (1), the expression Max (a1, a2,...) Indicates the maximum value among the numerical values a1, a2,... In the parentheses, and the expression Min (a1, a2,. Indicates the minimum value among the numerical values a1, a2,.

When the transmitter 110 exists inside the region R, | x ₀ −x | ≦ Δx, | y ₀ −y | ≦ Δy, and | z ₀ −z | ≦ Δz hold. That is, when all of the values of | x ₀ −x | −Δx, | y ₀ −y | −Δy, and | z ₀ −z | −Δz are negative, the transmitter 110 exists inside the region R. When any of these values is positive, it can be determined that the transmitter 110 exists outside the region R.

  When the transmitter 110 exists outside the region R, the pseudo distance D given by the equation (1) is determined by the transmission of each of the planes facing the transmitter 110 out of the six planes defining the region R and the transmission. It becomes the maximum value of the distance to the machine 110. However, in the case where the transmitter 110 exists inside two planes facing each other, the distance between these two planes is excluded. For example, in FIG. 11, since the transmitter 110 exists inside each of the two yz planes and the two zx planes, the pseudorange D is eventually the upper boundary surface (xy plane) of the region R that the transmitter 110 faces. And the distance.

  On the other hand, when the transmitter 110 exists inside the region R, the pseudo distance D is a value obtained by negating the minimum value of the distances between the boundary surfaces of the region R and the transmitter 110. When the transmitter 110 passes through the boundary surface of the region R and enters the inside from the outside of the region R or exits from the inside of the region R, the pseudorange D becomes zero.

  FIG. 12 is a schematic diagram showing the relative position of the transmitter 110 with respect to the region R. FIG. 13 is a table showing an example in which the pseudo distance with the region R is calculated for the log data indicating the coordinates of the transmitter 110. In FIG. 12, the center point C of the region R is (1056, 710, 1142), and the margin provided for the center point of the region R is (70, 70, 100). Calculated.

As described above, the positional relationship between the transmitter 110 and the region R can be determined by the code of the pseudorange D. For example, since the sign of pseudorange D is positive (D = 107.03) at time 15:47:29 146, it is determined that transmitter 110 exists outside region R (position p _{1 in} FIG. 12). reference). After that, the sign of the pseudo distance D changes from positive to negative between time 15: 47: 29.288 and time 15: 47: 29.423 (D = 30.36 → −19.31). It is determined that the transmitter 110 has passed through the boundary surface of the region R and has entered the region R (see positions p ₂ and p _{3 in} FIG. 12). Then, since the sign of pseudo distance D negative continues, the transmitter 110 is determined to be moving inside the region R (the reference position p ₄ in FIG. 12). Since the sign of the pseudo distance D changes from negative to positive between time 15:47:30 265 and time 15:47:30 407 (D = −0.88 → 4.78), the transmitter It is determined that 110 passes through the boundary surface of the region R and comes out of the region R (see positions p ₅ and p _{6 in} FIG. 12). Then, since the sign of pseudo distance D is a positive continues, the transmitter 110 is determined to be moving outside the area R (see position p ₇ in FIG. 12).

  In this manner, the sign of the pseudo distance D with respect to the region R is discriminated, and the timing at which the sign changes from negative to positive (the transmitter 110 goes outside from the inside of the region R) is extracted. The operation of 2 can be divided into the start of work, the passage of a passing point, and the end of work. In other words, the pseudorange is a parameter representing the positional relationship between the transmitter 110 and the position where the work from the start point to the end point via the passing point is to be executed.

  FIG. 14 is a flowchart showing details of the pseudo-range calculation process in step S520. FIG. 15 is a table showing the pseudo distance calculation results for a series of log data. Note that FIG. 15 shows all the pseudo distances between the start point region, the passing point region, and the end point region for each log data as reference. Among these, parentheses are attached to pseudoranges that are not calculated in step S520.

  First, in step S5201, the work time calculation unit 150 sets a parameter i indicating the output order of log data sequentially output from the position calculation unit 130 to 1. Hereinafter, the log data of the parameter i is referred to as log data i.

  In subsequent step S5202, work time calculation unit 150 sets parameter j indicating the work order to 1. Hereinafter, the work order of the parameter j is referred to as work order j.

In step S5203, the work time calculation unit 150 calculates a pseudo distance D _i between the log data i and the start point region in the work in the work order j. For example, for the log data i (i = 1) at the beginning of this processing, the pseudo distance from the start point area of the work in the work order 1 (part A is set: see FIG. 5) is calculated.

In step S5204, the work time calculation unit 150 determines whether the calculated pseudo distance D _i is greater than zero. When the pseudo distance D _i is less than or equal to zero (step S5204: NO), the work time calculation unit 150 increases the parameter i by 1 (step S5205), and then returns to the process of step S5203. In step S5204, when i = 1, the process proceeds to step S5205 regardless of the value of the pseudo distance D _i .

On the other hand, when the pseudo distance D _i is greater than zero (step S5204: Yes), the work time calculation unit 150 subsequently determines whether the pseudo distance D _i-1 for the immediately preceding log data (i-1) is equal to or less than zero. Is determined (step S5206). When the pseudo distance D _i-1 is larger than zero (step S5206: No), the work time calculation unit 150 increases the parameter i by 1 (step S5205), and then returns to the process of step S5203.

On the other hand, when the pseudo distance D _i-1 is less than or equal to zero (step S5206: Yes), the work time calculation unit 150 increases the parameter i by 1 (step S5207), and then proceeds to the process of step S5208. .

For example, referring to the calculation result Q1 of the pseudo distance with the start point area shown in FIG. 15, the sign of the pseudo distance D _i with respect to the log data i at time 15:47:27 is 470 is positive (D = 29.90). (Step S5204: Yes), the sign of the immediately preceding pseudorange D _i-1 is negative (D = −7.10) (Step S5206: Yes). At this time, it can be said that the transmitter 110 has left the starting point area, that is, the worker 2 has started work in the work order j.

In step S5208, the work time calculation unit 150 calculates a pseudo distance D _i between the log data i and the passing point area in the work in the work order j.

In subsequent step S5209, work time calculation unit 150 determines whether or not calculated pseudo distance D _i is greater than zero. When the pseudo distance D _i is less than or equal to zero (step S5209: No), the work time calculation unit 150 increases the parameter i by 1 (step S5210), and then returns to the process of step S5208.

On the other hand, when the pseudo distance D _i is greater than zero (step S5209: Yes), the work time calculation unit 150 subsequently determines whether the pseudo distance D _i-1 for the immediately preceding log data (i-1) is equal to or less than zero. Is determined (step S5211). If the pseudo distance D _i-1 is greater than zero (step S5211: NO), the work time calculation unit 150 increases the parameter i by 1 (step S5210), and then returns to the process of step S5208.

On the other hand, when the pseudo distance D _i-1 is equal to or less than zero (step S5211: Yes), the work time calculation unit 150 increases the parameter i by 1 (step S5212), and then proceeds to the process of step S5213. .

  For example, referring to the calculation result Q2 of the pseudo distance with the passing point area shown in FIG. 15, the sign of the pseudo distance changes from positive to negative (D = 60.67 → −17.28), and then the sign is positive again. It can be said that the transmitter 110 was present in the passing point region until it changed to (D = −34.39 → 58.28). The sign of the pseudorange for the log data at time 15: 47: 28: 727 is positive (D = 58.28) (step S5209: Yes), and the sign of the pseudorange for the log data immediately before is negative (D = −34.39) (step S5211: Yes), and at this time, the transmitter 110 has left the passing point area, that is, the worker 2 passes the passing point defined in the work of the work order j. It can be said that.

In step S5213, the work time calculation unit 150 calculates a pseudo distance D _i between the log data i and the end point area in the work in the work order j.

In subsequent step S5214, the work time calculation unit 150 determines whether or not the calculated pseudo distance D _i is greater than zero. When the pseudo distance D _i is less than or equal to zero (step S5214: No), the work time calculation unit 150 increases the parameter i by 1 (step S5215), and then returns to the process of step S5213.

On the other hand, when the pseudo distance D _i is greater than zero (step S5214: Yes), the work time calculation unit 150 subsequently determines whether the pseudo distance D _i-1 for the immediately preceding log data (i-1) is equal to or less than zero. Is determined (step S5216). When the pseudo distance D _i-1 is larger than zero (step S5216: No), the work time calculation unit 150 increases the parameter i by 1 (step S5215), and then returns to the process of step S5213.

On the other hand, when the pseudo distance D _i-1 is equal to or less than zero (step S5216: Yes), the work time calculation unit 150 increases the parameter i by 1 (step S5217).

  For example, referring to the calculation result Q3 of the pseudorange with the end point region shown in FIG. 15, the sign of the pseudorange changes from positive to negative (D = 30.36 → −19.31), and then the sign becomes positive again. Until the time of change (D = −0.88 → 4.78), it can be said that the transmitter 110 was present in the end point region. The sign of the pseudorange for the log data at the time 15:47:30 407 is positive (D = 4.78) (step S5215: Yes), and the sign of the pseudorange for the log data immediately before is negative (D = −0.88) (step S5216: Yes), it can be said that at this time, the transmitter 110 has left the end point area, that is, the worker 2 has finished the work in the work order j.

  In step S5218 following step S5217, the work time calculation unit 150 increases the parameter j by one. Thereafter, when there is log data i to be calculated (step S5219: Yes), the processing of the work time calculation unit 150 proceeds to step S5203. On the other hand, when there is no log data i to be calculated, the process of the work time calculation unit 150 returns to the main routine.

  The pseudo distance calculated in this way is stored in the storage unit 140 in association with log data (position information and time information of the transmitter 110). Note that when the passing points are not defined as in the operations in the operation orders 4 and 6 shown in FIG. 5, the processes in steps S5207 to S5211 are omitted.

  In step S530 subsequent to step S520 shown in FIG. 10, the work time calculation unit 150 determines a work start time, a passing time at a passing point, and an end time for each work. Specifically, the time when the sign of the pseudorange calculated in step S530 changes from negative to positive is set as the start time, the passage time, and the end time of each work.

  For example, in the case of the log data shown in FIG. 15, the time 15:47:27 (see calculation result Q1) at which the sign of the pseudorange with the starting point region changes from negative to positive is determined as the work start time. Also, the time 15:27:28 727 (see calculation result Q2) at which the sign of the pseudorange with the passing point region changes from negative to positive is determined as the passing time of the passing point. Further, the time 15:47:30 407 (see calculation result Q3) at which the sign of the pseudorange with the end point region changes from negative to positive is determined as the work end time.

In subsequent step S540, the work time calculation unit 150 calculates the difference between the work start time and the work end time determined in step S530 as the work time. For example, in the case of FIG. 15, 2 seconds 937, which is the difference between the start time 15:47:27 470 and the end time 15:47:30 407, is calculated as the work time of the work. The calculated work time is stored in the storage unit 140 as a work analysis result.
Thereafter, the operation of the work analysis system 1 returns to the main routine.

  In step S600 following step S500 illustrated in FIG. 9, the determination unit 160 determines whether the work time is appropriate by comparing the work time calculated in step S500 with the standard work time.

  FIG. 16 is a table showing the determination result of the work time. For example, when the work time is calculated for each work in the work orders 1 to 6, the determination unit 160 reads the standard work time information 230 (see FIG. 8) from the storage unit 140, and calculates the work for each work. Compare time with standard working hours. If the calculated work time is less than or equal to the standard work time, the work time is appropriate (see the circle), and if the calculated work time is longer than the standard work time, the work time is appropriate. It is determined that it is not (see the x mark) This determination result is also stored in the storage unit 140 as the analysis result of the working time.

In subsequent step S700, the control unit 190 outputs the calculation result of the work time by the work time calculation unit 150 and the determination result of the work time by the determination unit 160 as a work analysis result, for example, in a format as shown in FIG. It is displayed on the display unit 180.
Thereafter, the operation of the work analysis system 1 ends.

  As described above, according to the first embodiment, the position calculation unit 130 calculates the position of the transmitter 110 in real time based on the detection signal of the ultrasonic signal transmitted from the transmitter 110, and the transmitter Work analysis including calculation and determination of work time can be automatically performed based on log data representing 110 positions. This makes it possible to shorten the time required for the measurement and analysis of the work as compared with the prior art, and to obtain a specific determination result for the work performed by the worker. Moreover, according to Embodiment 1, since the determination result of work time is displayed for every work content, the user can grasp | ascertain the work which should be improved instantly. Therefore, the user can efficiently consider an improvement plan even within a limited time.

(Modification 1-1)
Next, Modification 1-1 of Embodiment 1 of the present invention will be described.
In the first embodiment, in step S530 in FIG. 10, the work time calculation unit 150 detects a change in the sign of the pseudorange, so that the transmitter 110 performs processing for each of the start point region, the pass point region, and the end point region. Determined going in and out. However, the determination method is not limited to this as long as the timing at which the transmitter 110 passes through the boundary surfaces of these regions can be extracted. For example, the entrance / exit of the transmitter 110 with respect to the region R may be determined by determining the extreme value of the pseudorange.

(Modification 1-2)
Next, a modified example 1-2 of the first embodiment of the present invention will be described.
In step S530 of FIG. 10, the sign of the pseudorange changes from positive to negative when determining whether the transmitter 110 enters and leaves the start point region, the pass point region, and the end point region (that is, the transmitter 110 is in a certain region). If there is an inconsistency such that the sign of the pseudorange has changed from negative to positive (ie, the transmitter 110 exits from the area) May be output. In this case, the control unit 190 may cause the display unit 180 to display a warning that the data is abnormal based on the information.

(Modification 1-3)
Next, Modification 1-3 of Embodiment 1 of the present invention will be described.
In the first embodiment, in step S520 in FIG. 10, the work time calculation unit 150 applies any one of the start point region, the passing point region, and the end point region in one operation to the log data sequentially output from the position calculation unit 130. Although the pseudo distance with the heel has been calculated, the pseudo distance with the plurality of regions may be calculated.

  For example, for each log data, all pseudo distances to the start point area, the passing point area, and the end point area in the work in a certain work order may be calculated. Even in this case, the start time of the work is determined based on the sign (or extreme value) of the pseudo distance with the start point area, and the passing time of the passing point is set to the sign (or extreme value) of the pseudo distance with the passing point area. The work end time is determined based on the sign (or extreme value) of the pseudorange with the end point region. Then, when the sign of the pseudo-range with the end point area changes from negative to positive, the work is delimited, and from the next log data, the start point area, the passing point area, and the end point area in the work of the next work order Calculate the pseudorange.

  According to the modified example 1-3, even when the starting point and the passing point cannot be extracted from the determination of the pseudorange code and the extreme value, the work can be divided. Thus, it is possible to suppress the deviation from the area where the pseudorange should be calculated.

(Modification 1-4)
Next, Modification 1-4 of Embodiment 1 of the present invention will be described.
In the case of calculating the pseudo distances between the start point region, the passing point region, and the end point region for each log data as in Modification 1-3, when determining the entry and exit of the transmitter 110 with respect to each region, When there is an inconsistency in the determination result, the work time calculation unit 150 may output information indicating that there is an abnormality in the data. For example, a determination result that the transmitter 110 has exited from the start point region before entering the start point region or that the transmitter 110 has entered the pass point region before entering the start point region is determined to be inconsistent. In this case, the control unit 190 may cause the display unit 180 to display a warning that the data is abnormal based on the information.

(Modification 1-5)
Next, Modification 1-5 of Embodiment 1 of the present invention will be described.
The determination method of the work time performed by the determination unit 160 is not limited to the first embodiment, and may be changed as appropriate according to the work content and the like. For example, when the calculated work time is within a predetermined range (± 10% or the like) with respect to the standard work time, the work time may be determined to be appropriate.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
FIG. 17 is a block diagram illustrating a configuration example of the work analysis system according to the second embodiment. As illustrated in FIG. 17, the work analysis system 3 according to the second embodiment further includes a trajectory creation unit 310 with respect to the work analysis system illustrated in FIG. 1. The trajectory creation unit 310 creates a trajectory of the transmitter 110 based on the calculation result of the position of the transmitter 110 by the work time calculation unit 150.

  Hereinafter, the work analysis method according to the second embodiment will be described. FIG. 18 is a flowchart showing a work analysis method according to the second embodiment. Note that steps S100 to S500 shown in FIG. 18 are the same as those in the first embodiment.

  In step S800 following step S500, the trajectory creation unit 310 creates a trajectory of the transmitter 110. FIG. 19 is a flowchart showing a trajectory creation process.

  First, in step S801, the trajectory creation unit 310 creates a trajectory for which the transmitter 110 has moved for each operation based on the coordinates of the transmitter 110 included in the series of log data. More specifically, the trajectory creation unit 310 divides a series of log data at the end time of each work, and creates a trajectory using the log data within the delimited range. This trajectory can be regarded as a work flow line of the worker 2 in each work.

  In subsequent step S802, the trajectory creation unit 310 divides the trajectory created for each work by the start point, the passing point, and the end point, and displays each point on the trajectory so that the divided sections are displayed in different colors. Assign a display color to. In each section, a single color may be used, or the color may be changed, for example, a gradation is added from the start point to the end point of each section.

  In subsequent step S803, the trajectory creation unit 310 acquires an ideal route (standard route) of the flow line for each work. For this standard route, a route calculated by simulation software based on the coordinates of the start point, passing point, and end point defined in the work position information 220 (see FIG. 5) is stored in advance in the storage unit 140 as standard route information. The standard route information is obtained by reading out. Or you may acquire by calculating the shortest path | route with simulation software based on the coordinate of the starting point on the locus | trajectory which the locus | trajectory creation part 310 produced, the passing point, and an end point.

  Thereafter, the operation of the work analysis system 3 returns to the main routine. Subsequent steps S600 and S700 are the same as those in the first embodiment.

In step S900 following step S700, the trajectory creation unit 310 includes standard data including the trajectory data including the coordinate values and color information of the trajectory assigned the display color in step S802, and the standard route coordinate values acquired in step S803. Output route data. In response to this, the control unit 190 causes the display unit 180 to display the trajectory in a three-dimensional manner with the color assigned to each section, and to display the standard route in a three-dimensional manner on the trajectory.
Thereafter, the operation of the work analysis system 3 ends.

20 and 21 are schematic diagrams showing examples of locus display. Among these, in FIG. 20, the locus of the right hand of the worker 2 is shown in the coordinate system (x _R , y _R , z _R ), and in FIG. 21, the locus of the left hand of the worker 2 is represented in the coordinate system (x _L , y _L , z _L ).

As shown in FIG. 20, the section from the start point P _R1 to the passing point P _{R2 and} the section from the passing point P _R2 to the end point P _R3 are displayed in different colors, and a gradation is given in each section. Similarly, in FIG. 21, the section from the start point P _L1 to the passing point P _L2 , the section from the passing point P _L2 to the end point P _L3 , and the section from the end point P _L3 to the starting point P _L1 are displayed in different colors. There is a gradation inside. In FIGS. 20 and 21, the difference in color is indicated by the difference in pattern.

By displaying the standard routes W _R1 , W _R2 , W _L1 , W _L2 , and W _L3 superimposed on these trajectories, the user compares the two and specifically grasps the wasteful movement of the work flow line. This makes it easier to consider improvement measures.

  20 and 21 show examples in which the trajectory of the right hand and the left hand of the worker 2 is displayed on different screens, both may be displayed on the same screen. 20 and 21 may be displayed on the same screen as the analysis result of the work time shown in FIG. In this case, when the user selects any of the operations shown in FIG. 16 using the input unit 170, a trajectory corresponding to the selected operation may be displayed on the same screen.

  Further, instead of displaying the trajectory for each work, a trajectory of a series of work (for example, work in work order 1 to 6 shown in FIG. 5) may be displayed simultaneously. Or you may display the locus | trajectory of a several user's desired operation | work simultaneously by operation using the input part 170. FIG.

  Furthermore, the three-dimensional display angle of the trajectory or the standard route may be changed by operating the coordinate axes of the trajectory shown in FIG. 20 or FIG. 21 using the input unit 170.

  As described above, according to the second embodiment of the present invention, since the trajectory of the worker 2 is displayed for each work, each work can be easily analyzed visually. Further, by displaying the standard route so as to overlap the trajectory of the worker 2, it is possible to perform further analysis such as grasping the useless movement of the worker 2.

(Modification 2-1)
Next, Modification 2-1 of Embodiment 2 of the present invention will be described.
The trajectory creation unit 310 may further calculate a difference between the two after obtaining the trajectory and the standard route of the transmitter 110. Then, a portion of the trajectory where the difference exceeds a predetermined threshold is displayed on the display unit 180 in a manner different from other portions, such as blinking display.

  It can be said that a portion of the trajectory where the difference from the standard route is large is a portion where the operator 2 has a lot of useless movement. Therefore, the user can more easily grasp the useless movement of the worker 2 by automatically extracting a portion having a large difference and displaying it in a manner different from other portions.

(Modification 2-2)
Next, Modification 2-2 of Embodiment 2 of the present invention will be described.
When the trajectory creation unit 310 acquires the trajectory and the standard route of the transmitter 110 and further calculates the difference between the two, the determination unit 160 extracts a work including a portion where the difference exceeds a predetermined threshold, You may display on the display part 180 as a determination result.

  FIG. 22 is a table showing a display example of the trajectory determination result, in which the trajectory determination result is added to the work time determination result shown in FIG. In FIG. 22, the work content including a portion where the difference between the trajectory of the worker 2 and the standard route exceeds a predetermined threshold is marked with “X”. The user can instantly grasp the work content to be improved by referring to such a determination result.

  In the example shown in FIG. 22, the determination results of the trajectory corresponding to the work whose work time determination result is “◯” are all “◯”, but the determination result of the work time is “◯”. In spite of this, there may be an operation in which the determination result of the trajectory is “x”. In this case, the user grasps the worker's useless movement and improves the trajectory determination result to be “◯”, so that the standard work time is changed to the ideal work time. It is possible to approach.

  The present invention described above is not limited to the first and second embodiments and the modifications thereof, and can be variously modified according to specifications and the like. For example, some components may be excluded from all the components shown in the first and second embodiments and the modifications thereof. It is apparent from the above description that various other embodiments are possible within the scope of the present invention.

1, 3 Work analysis system 2 Worker 110 Transmitter 120 Receiver 130 Position calculation unit 140 Storage unit 141 Work content storage unit 142 Work position storage unit 143 Standard work time storage unit 144 Analysis result storage unit 150 Work time calculation unit 160 Determination Unit 170 input unit 180 display unit 190 control unit 200 log data structure 201 time data storage unit 202 ID storage unit 203 x coordinate data storage unit 204 y coordinate data storage unit 205 z coordinate data storage unit 210 work content information 211 work order storage unit 212 Work content storage unit 220 Work position information 221 ID storage unit 222 Start point coordinate storage unit 223 Pass point coordinate storage unit 224 End point coordinate storage unit 225 Start point margin storage unit 226 Pass point margin storage unit 227 End point margin storage unit 230 Standard Work time information 231 Standard work Time storage unit 310 Trajectory creation unit

Claims (15)

A position representing a three-dimensional position of the transmitter based on a signal transmitted wirelessly from a transmitter attached to a work detection target and received by a receiver arranged in a space in which the work is performed A location information acquisition unit that acquires information in association with time;
While calculating the position relationship between the position where the work should be performed and the position of the detection target based on the work position information and the position information where the position where the work should be performed is defined in advance, Based on the parameters, a starting point and an end point of the executed work are specified, and a work time calculation unit that calculates a difference in time corresponding to each of the start point and the end point as a work time required for the work;
A determination unit for determining the work time based on standard work time information defined in advance for a time when the work should be performed;
A work analysis system comprising: The work position information includes at least information defining a first area centered on a position where the work should be started and a second area centered on a position where the work should be finished,
The work time calculation unit specifies a start point of the executed work based on the parameter for the first area, and an end point of the executed work based on the parameter for the second area. Identify
The work analysis system according to claim 1.   The work analysis system according to claim 2, wherein the parameter represents a distance between each boundary surface of the first and second regions and the position of the detection target.   The work analysis system according to claim 3, wherein the work time calculation unit specifies the start point and the end point based on a sign of the parameter.   The work analysis system according to claim 3, wherein the work time calculation unit specifies the start point and the end point based on an extreme value of the parameter.   The work analysis system according to claim 1, further comprising a trajectory creation unit that creates a trajectory that the transmitter has moved based on the position information. The trajectory creation unit further acquires a route on which the work should be performed,
The work analysis system according to claim 6, further comprising a display unit that displays the trajectory and the route on a screen.   The work analysis system according to claim 6, wherein the trajectory creation unit further acquires a route on which the work should be executed, and determines the trajectory based on the route.   The work analysis system according to claim 8, further comprising a display unit that displays the trajectory on a screen and highlights an area where a difference between the route and the trajectory is a predetermined value or more.   The work analysis system according to claim 8, wherein the trajectory creation unit extracts a work in which a difference between the route and the trajectory is a predetermined value or more.   Radio communication means comprising: a transmitter that is mounted on the detection target and that wirelessly transmits a signal; and a receiver that is disposed in a space where the work is performed and that receives the signal transmitted from the transmitter. The work analysis system according to claim 1, further comprising:   The work analysis system according to claim 11, wherein the wireless communication unit transmits and receives an ultrasonic signal as the signal.   The work analysis system according to claim 11, wherein the wireless communication unit performs communication via a wireless LAN. A work analysis method by a work analysis system,
A signal transmitting and receiving step of transmitting a signal wirelessly from a transmitter attached to a work detection target, and receiving the signal by a receiver disposed in a space in which the work is performed;
Based on the signal received in the signal transmission / reception step, a position information acquisition step of acquiring position information representing a three-dimensional position of the transmitter in association with time;
While calculating the position relationship between the position where the work should be performed and the position of the detection target based on the work position information and the position information where the position where the work should be performed is defined in advance, Based on the parameters, a starting point and an end point of the executed work are specified, and a work time calculation step for calculating a difference in time corresponding to each of the start point and the end point as a work time required for the work;
A determination step of determining the work time based on standard work time information defined in advance for a time when the work should be performed;
A method for analyzing work, comprising: A position representing a three-dimensional position of the transmitter based on a signal transmitted wirelessly from a transmitter attached to a work detection target and received by a receiver arranged in a space in which the work is performed A location information acquisition step for acquiring information in association with time;
While calculating the position relationship between the position where the work should be performed and the position of the detection target based on the work position information and the position information where the position where the work should be performed is defined in advance, Based on the parameters, a starting point and an end point of the executed work are specified, and a work time calculation step for calculating a difference in time corresponding to each of the start point and the end point as a work time required for the work;
A determination step of determining the work time based on standard work time information defined in advance for a time when the work should be performed;
A work analysis program for causing a computer to execute.

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