JP2007323148A - Management support device, program and management support method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for obtaining the optimal inventory volume of components for repair. <P>SOLUTION: The lifetime t<SB>1</SB>of components is calculated from the early failure period and chance failure period of a failure factor curve, and the number of failures due to the lifetime of components is calculated from the number of lifetimes of components in a predetermined period T. Also, the early failure and chance failure of the failure factor curve are integrated by the life t<SB>1</SB>so that the number of failures due to the early failure and the change failure can be calculated. The number of failures is added so that the number of failures in the predetermined T can be predicted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a parts management support apparatus, program, and management support method, and more particularly, to a parts management support apparatus, program, and management support method for repair.

  The supplier supplying the product needs to stock and manage the parts for repairing the product.

  Conventionally, the number of parts in stock for repairing a product has been determined by empirically estimating from the shipment results of repair parts, the shipment results of products, the years of operation of products, and the like (see Patent Document 1). .

JP 2004-38700 A

  As in the past, empirically inferring from the shipment results of repair parts, the shipment results of products and the years of operation of products, it is impossible to grasp the optimal inventory of repair parts. There is a shortage of parts and excessive inventory.

  Therefore, an object of the present invention is to provide a technique capable of grasping an optimal inventory amount of parts for repair.

  In order to solve the above problems, the present invention calculates the number of parts required for repair due to the life, initial failure, and accidental failure of parts from a failure rate curve (bathtub curve).

  For example, the present invention is a management support device that supports management of parts, and includes a storage unit that stores a failure rate function indicating a failure rate with respect to usage time, and a calculation unit, and the calculation unit includes: A process of calculating a first number by specifying a lifetime that is the lifetime of a specific part from a failure rate function, and calculating a number that includes the lifetime in a predetermined period, and the failure rate function Multiplying the first number by the integral over the lifetime, the process of calculating the second number, and adding the first number and the second number, the specific part And a process of calculating the number of failures in the predetermined period.

  As described above, according to the present invention, it is possible to calculate the number of parts required for repair due to the life of parts, initial failure and accidental failure from the failure rate curve (bathtub curve). Based on this, it is possible to grasp the optimum inventory amount of repair parts.

  FIG. 1 is a schematic diagram of a management support apparatus 100 according to an embodiment of the present invention.

  As illustrated, the management support apparatus 100 according to the present embodiment includes a storage unit 110, a failure rate calculation unit 121, a failure rate correction unit 122, a prediction unit 123, a field information collection unit 124, and a field correction unit. 125, a time measurement unit 126, an input unit 130, and an IF unit 140.

  The storage unit 110 includes a target component information storage area 111, an initial setting information storage area 112, a correction information storage area 113, a prediction information storage area 114, and a field information storage area 115.

  In the target part information storage area 111, information about the user of the product, information about the product, and information about the part used in the product are stored in association with each other.

  For example, a component information table 180 as shown in FIG. 2 is stored in the target component information storage area 111.

  The component information table 180 includes a user name registration column 180a, a user ID registration column 180b, a product model registration column 180c, a product ID registration column 180d, a component model registration column 180e, and a component ID registration column 180f. is doing.

  In the user name registration column 180a, the name and name of a user who uses a part to be managed or a product having a part to be managed are registered.

  A user ID for uniquely identifying the user registered in the user name registration column 180a is registered in the user ID registration column 180b.

  In the product type registration column 180c, the model number of the product including the parts to be managed is registered.

  In the product ID registration field 180d, a product ID for uniquely identifying the product registered in the product type registration field 180c is registered. Even when the user uses a plurality of products, different product IDs are used to uniquely identify each product.

  In the part type registration field 180e, the model number of the part to be managed is registered. In this column, the same model number as the model registration column 185a of the field information table 185 for the corresponding component is registered.

  In the component ID registration field 180f, a component ID for uniquely identifying a component to be managed is registered. Even when there are a plurality of parts in one product, different part IDs are used to uniquely identify these parts. In this column, the same ID as that in the in-model consistent management number registration column 185b of the field information table 185 of the corresponding component is registered.

  In the initial setting information storage area 112, a failure rate function described later is stored, and information such as parameters used in the failure rate function is stored for each component to be managed. For example, a parameter table 181 as shown in FIG. 3 is stored for each component.

Parameter table 181 includes a type registration field 181a, and time registration field 181b, and the parameter m registration field 181c, and a parameter _{t 0} registration field 181d, the parameters γ and registration field 181e, a.

  Information for specifying the type of failure is registered in the type registration column 181a. In this embodiment, the type of failure is classified into three types: initial failure, accidental failure, and wear failure.

  The time when each failure occurs is registered in the time registration field 181b. Here, in the present embodiment, the initial failure occurs during “0 to 500 hr (hours)”, the accidental failure occurs during “500 to 100,000 hr”, and the wear failure exceeds “100,000 hr”. However, the present invention is not limited to such an embodiment.

  In the parameter m registration column 181c, m, which is a shape parameter, is registered for each of an initial failure, an accidental failure, and a wear failure. Note that m <1 for the initial failure, m = 1 for the accidental failure, and m> 1 for the wear failure.

In the parameter t ₀ registration column 181d, t ₀ which is a scale parameter of the failure rate curve is registered in each of the initial failure, the accidental failure, and the wear failure.

  In the parameter γ registration field 181e, a position parameter γ indicating the start position (start time) of the initial failure, the accidental failure, and the wear failure is registered.

  These parameters will be described in detail below.

  Further, in the initial setting information storage area 112, a failure rate table 182 (see FIG. 4) in which failure rates calculated from parameters specified in the parameter table 181 are tabulated in a time series or failure rate curve summarized in a graph. 183 (see FIG. 5) is also stored. The failure rate table 182 and the failure rate curve 183 will also be described in detail below.

  In the correction information storage area 113, correction information for correcting the failure rate is stored. In this embodiment, for example, the correction coefficient can be specified from the temperature around the component, for example, in FIG. A correction graph 184 as shown is stored.

  In the prediction information storage area 114, the number of parts that fail in a predetermined period calculated by the prediction unit 123 described later is stored for each part.

  The field information storage area 115 stores information on the usage status of the parts that are actually used. In the present embodiment, for example, a field information table 185 as shown in FIG. 7 is created every day in the field information collection unit 124 described later for each part and stored in this storage area.

As illustrated, the field information table 185 includes a model registration field 185a, an in-model consistent management No registration field 185b, an operation start date registration field 185c, a failure occurrence date registration field 185d, and an operation stop date registration field 185e. Failure order registration field 185f, failure rate registration field 185g, accumulated operation time until failure occurrence field 185h, corrected failure rate registration field 185i, corrected failure rate accumulation registration field 185j, and corrected operation until failure occurrence Time accumulation registration field 185k, active average correction coefficient registration field 185l, date registration field 185m, today's operation time registration field 185n, today's correction operation time registration field 185o, and today's correction coefficient μ ₁ and the registration field 185p, and the operating time cumulative registration field 185q up to today, and the correction operation time cumulative registration field 185r up to today, the cumulative correction coefficients up to today μ A registration field 185S, and time registration field 185T, and the operating state registration field 185U, and starting and stopping state registration field 185 V, and the temperature registration field 185W, and the correction coefficient registration section 185x, the operating time registration field 185Y, correction operation time A registration field 185z.

  In the type registration column 185a, an identification ID for identifying the type (type) of the part that is the target of the field information table 185 is registered. This information may be input by the operator of the management support apparatus 100 via the input unit 130.

  In the in-model consistent management number registration field 185b, an identification ID for uniquely identifying a component that is the target of the field information table 185 is registered. The identification ID may be registered by the operator of the management support apparatus 100 via the input unit 130, but every time information is registered in the model registration field 185a, a predetermined rule (for example, serial number in order) Or the like) may be generated and registered.

  In the operation start date registration field 185c, the operation (use) start date of the part that is the object of the field information table 185 or the product that uses the part is registered. This information may be registered by the operator of the management support apparatus 100 via the input unit 130.

  In the failure occurrence date registration field 185d, the date of failure of the part whose field information is to be acquired is registered. This information may be registered by the operator of the management support apparatus 100 via the input unit 130. Also, the failure date registration field 185d is blank when no failure has occurred in the part that is to be created in the field information table 185 on the creation date of the field information table 185.

  In the operation stop date registration field 185e, the operation (use) stop date of a part for which field information is acquired or a product using such a part is registered. This information may be registered by the operator of the management support apparatus 100 via the input unit 130. In addition, the operation stop date registration field 185e indicates that the operation (use) of the component (or product including the component) that is the target of creation of the field information table 185 on the creation target date of the field information table 185 was not stopped. In some cases, it is left blank.

  The failure order registration column 185f indicates the order of failure in the same component (the component in which the same ID is registered in the model registration column 185a) when the component whose field information is to be acquired fails. Failure order is registered. The failure order is calculated by a field correction unit 125 described later and registered in this field. Further, the failure order registration column 185f is left blank when no failure has occurred in the part that is the creation target of the field information table 185 on the creation target date of the field information table 185.

  In the failure rate registration field 185g, a failure rate calculated by the reciprocal of the number of parts of the same type that are currently operating is registered. This failure rate is also calculated by the field correction unit 125 described later. Further, the failure rate registration column 185g is left blank when no failure has occurred in the part that is the creation target of the field information table 185 on the creation target date of the field information table 185.

  In the accumulated operation time until failure occurrence column 185h, the accumulated operation time until the failure occurs after the part that is the object of the field information table 185 starts operation (use) is registered. The accumulated operation time is also calculated by the field correction unit 125 described later. Further, the accumulated operation time until failure occurrence field 185h is blank when no failure has occurred in the part that is to be created in the field information table 185 on the creation date of the field information table 185.

  In the corrected failure rate registration column 185i, the corrected failure rate corrected by the overall average correction coefficient registered in the operating average correction coefficient registration column 185l is registered in the failure rate registered in the failure rate registration column 185g. This corrected failure rate is also calculated by the field correction unit 125 described later. Further, the corrected failure rate registration field 185i is left blank when no failure has occurred in the part that is the creation target of the field information table 185 on the creation target date of the field information table 185.

  In the corrected failure rate cumulative registration field 185j, when a component subject to the field information table 185 fails, the failure rank of the highest in the failure type (initial failure, accidental failure or wear failure) of the component is given. The cumulative value that is the sum of the corrected failure rates from the failure to the failure ranking registered in the failure ranking registration field 185f is registered. Here, since there is nothing else to add for the failure type with the highest failure rank, the accumulated value is the corrected failure rate. Note that the cumulative value of the corrected failure rate is also calculated by the field correction unit 125 described later. The corrected failure rate cumulative registration field 185j is blank when no failure has occurred in the part that is the creation target of the field information table 185 on the creation date of the field information table 185.

  In the corrected operation time accumulated registration column 185k until the failure occurs, the corrected operation time accumulated obtained by correcting the accumulated operation time registered in the operation time accumulated registration column 185h until the failure occurs with the correction coefficient registered in the correction coefficient registration column 185x. Is registered. The accumulated correction operation time is also calculated by the field correction unit 125 described later. Also, the corrected operation time accumulated registration column 185k until the failure occurs is blank when no failure has occurred in the part that is the creation target of the field information table 185 on the creation date of the field information table 185. .

The average correction coefficient registration section 185l running, as the average correction coefficient which the cumulative value to be registered in the cumulative correction coefficient mu ₂ registration field divided by the number of days from the production start date to failure date until today, which will be described later Registered in this column. This average correction coefficient is also calculated by the field correction unit 125 described later. Further, the average correction coefficient registration column 185l in operation is left blank when no failure has occurred in the part that is the creation target of the field information table 185 on the creation target date of the field information table 185.

  The creation date of the field information table 185 is registered in the year / month / day registration field 185m. The creation date may be registered by acquiring necessary data from the time measuring unit 126 described later.

  In the today's working time registration field 185n, the working time of the part that is the creation target of the field information table 185 on the creation target date of the field information table 185 is registered. The operation time is calculated by adding each time registered in an operation time registration field 185y described later in the field information collection unit 124.

  In today's corrected operation time registration field 185o, correction is performed by correcting the operation time of the part that is the creation target of the field information table 185 on the creation date of the field information table 185 with the correction coefficient registered in the correction coefficient registration field 185x. Register the operating time. The corrected operation time is calculated by adding each of the corrected operation times registered in the corrected operation time registration field 185z described later in the field information collection unit 124.

In the today's correction coefficient μ ₁ registration field 185p, the field information collection unit 124 calculates an average value of correction coefficients registered in a correction coefficient registration field 185x, which will be described later, and the calculated value is the average value μ of the correction coefficient today. Register as ₁ in this column. Specifically, the product obtained by multiplying the operation time corresponding to the correction coefficient registered in the correction coefficient registration field 185x is added and divided by the current operation time registered in the current operation time registration field 185n. Is calculated by

  In the accumulated operating time registration column 185q up to today, the accumulated value of the operating time from the operation start date is registered. In addition, since the field information table 185 in this embodiment is created every day, it is only necessary to add today's operation time to the cumulative value registered in the same column in the field information table created on the previous day. Here, when the creation target date of the field information table 185 is the operation start date, the operation time registered in the operation time registration column 185n of today is the cumulative value of the operation time. Note that the field information collection unit 124 also calculates the cumulative value of operating hours up to today.

  The accumulated value of the corrected operation time from the operation start date is registered in the corrected operation time accumulated registration field 185r up to today. In addition, since the field information table 185 in this embodiment is created every day, today's corrected operating time may be added to the cumulative value registered in the same column in the field information table created on the previous day. Here, when the creation date of the field information table 185 is the operation start date, the corrected operation time registered in the today's corrected operation time registration field 185o is the cumulative value of the correction operation time. Note that the field information collection unit 124 also calculates the cumulative value of the corrected operation time up to this date.

In the cumulative correction coefficient μ ₂ registration column 185 s up to today, the cumulative value μ ₂ of the correction coefficient from the operation start date is registered. Since the field information table 185 in this embodiment is created every day, the accumulated value of the correction coefficient registered in the same column in the field information table created on the previous day is multiplied by the accumulated operating time up to the previous day. to, those obtained by multiplying the today uptime today of the correction coefficient mu _1, adding to, may be divided uptime cumulative until today. Here, generation target date field information table 185 in the case of working start date, the correction coefficient mu ₁ registered today of the correction coefficient mu ₁ registration field 185p becomes the total value of mu ₂ of the correction coefficient. Note that the field information collection unit 124 also calculates the cumulative correction coefficient μ ₂ up to today.

  Information indicating the time at predetermined time intervals is registered in the time registration field 185t. Here, in this embodiment, serial numbers 1 to 24 are assigned to the time registration field 185t at intervals of 1 hour each. Time zones corresponding to the respective time numbers are determined in advance such that time number 1 is 0: 00 to 1: 00 and time number 2 is 1 00 to 2:00.

  In the operation state registration field 185u, it is registered whether or not the component (or the device to which the component is attached) is in the operation state in the time zone corresponding to each time number. Here, in this embodiment, “0” is registered when the vehicle is not in the operating state in the time zone corresponding to each time number, and “1” is registered when the vehicle is in the operating state. ing. In the present embodiment, “1” is registered when the vehicle has been operating for a predetermined time or longer. In the present embodiment, a sensor is attached to the switch of the device to which the component is attached, and a signal from the sensor is acquired by the field information collecting unit 124 via the IF unit 140, and a predetermined value is entered in this field. Information is registered.

  In the start / stop state registration field 185v, information for identifying that the part (or the device to which the part is attached) is started or stopped in the time zone corresponding to each time number is registered. . In the present embodiment, “1” is registered when at least one of start and stop is performed in the time zone corresponding to each time number. In the present embodiment, a sensor is attached to a switch of a component (or a device to which the component is attached), and a signal from this sensor is acquired by the field information collection unit 124 via the IF unit 140. Predetermined information is registered in this column.

  In the temperature registration field 185w, the temperature around the part (or the device to which the part is attached) that is the target of the field information table 185 is registered. In the present embodiment, a sensor is attached to a predetermined position of the device to which the component is attached, and a signal from this sensor is acquired by the field information collection unit 124 via the IF unit 140 and is stored in this field. Predetermined information is registered. In addition, although the temperature changes every moment in the time zone corresponding to each time number, the average value in the time zone corresponding to each time number and the representative value at a specific time in the time body corresponding to each time number are shown in this column. You can register for.

The correction coefficient registration section 185x, registers seeking correction coefficient mu _T corresponding to the temperature that is registered to a temperature registration field 185w from the correction information storage area 113 corrected chart is stored in the 185 (see FIG. 6). Note that the correction coefficient mu _T, is calculated from the correction chart 185 in field information collection unit 124.

  In the operation time registration field 185y, the operation time in the time zone corresponding to each time number is registered. Here, in the present embodiment, the operation time (here, minutes) is calculated by the field information collection unit 124 from the time information measured by the time measurement unit 126 described later, and is registered in this field.

  In the corrected operation time registration field 185z, the corrected operation time calculated by multiplying the operation time registered in the operation time registration field 185y by the correction coefficient registered in the correction coefficient registration field 185x is registered. The operation time and the correction coefficient are multiplied by the same time number. Such multiplication is performed in the field information collection unit 124.

  The failure rate calculation unit 121 specifies the failure rate of the component to be managed by the management support apparatus 100 based on the parameter specified by the parameter table 181 stored in the initial setting information storage area 112, and the failure rate Specify a curve (bathtub curve). Here, the failure rate curve is a rate (probability) that a part that has not failed at that time, that is, a surviving part fails per unit time when a predetermined time elapses.

  Here, a reliability function, an unreliability function, a failure density function, and a failure rate function, which are prerequisites for specifying the failure rate curve, will be described.

  The reliability function R (t) is a rate (probability) that a part survives without failure when time t has elapsed since the start of use of the part (device with the part attached). Here, the reliability function R (t) is expressed as the following equation (1), where N is the number of parts that have started to be used, and c (t) is the number of parts that have failed at time t. Is done.

  The unreliability function F (t) is a ratio (probability) that the part has failed when the time t has elapsed since the start of use of the part (device to which the part is attached). It is expressed as an expression.

  The failure density function f (t) is a ratio (probability) that a failure of a part occurs per unit time when the time t has elapsed since the start of use of the part (device to which the part is attached). It is expressed as equation (3).

  Note that the failure density function f (t) has properties such as the following equations (4) and (5).

  The failure rate function λ (t) indicates that when a time t has elapsed since the start of use of a component (a device to which the component is attached), a component that has not failed (survived) at that time is This is the failure rate (probability) and is expressed as the following equation (6).

  A failure rate curve is obtained by expressing the failure rate function λ (t) on the coordinates with the time t as the horizontal axis and the failure rate at the time t as the vertical axis.

  The reliability function R (t), the unreliability function F (t), the failure density function f (t), and the failure rate function λ (t) may be obtained by a known method. Then, these are specified using a Weibull function, and these functions are stored in the initial setting information storage area 112.

  The reliability function R (t) in the Weibull function is expressed as the following equation (7).

  The unreliability function F (t) in the Weibull function is expressed as the following equation (8).

  The failure density function f (t) in the Weibull function is expressed as the following equation (9).

  The failure rate function λ (t) in the Weibull function is expressed as the following equation (10).

Here, the parameters m, t ₀ , and γ in the above equations (7) to (10) are as follows.

  The parameter m is a shape parameter. When m <1, the initial failure is indicated as follows. When m = 1, the accidental failure is indicated as follows. When m> 1, the following is indicated. Shows wear failure. As for the value of m, an optimal numerical value may be selected as appropriate from the actual failure rate or the like.

The parameter t ₀ is a scale parameter and indicates a time scale of the curve like a time constant. As for the value of t _0, an optimal numerical value may be appropriately selected based on an actual failure rate or the like.

  The parameter γ is a position parameter and indicates the start time of the initial failure, the accidental failure, and the wear failure. For this parameter γ, an optimal numerical value may be appropriately selected based on an actual failure rate or the like.

The initial values of the parameters m, t ₀ , and γ as described above are stored as initial setting values in the initial setting information storage area 112 of the storage unit 110. For example, as shown in FIG. 2, a parameter table 181 is stored in the initial setting information storage area 112, and the failure rate calculation unit 121 calculates the failure rate of the target component using these parameters. .

  Usually, component failures are classified into initial failures, accidental failures, and wear failures.

  An initial failure is a failure that occurs relatively early immediately after the start of use of a part (including one incorporated in a product), and is caused by a design or manufacturing defect, an incompatibility with a use environment, or the like. For this initial failure, the failure rate gradually decreases as the usage period increases, so the value of the parameter m is m <1.

  The accidental failure is a failure that occurs after the initial failure period and before the wear failure period, which will be described later, and is a failure that occurs for an accidental reason. For this accidental failure, the value of the parameter m is 1 because the failure rate hardly changes regardless of the period of use.

  A wear failure is caused by a long period of use of parts (including those incorporated in a product), fatigue, wear or aging. For this wear failure, the failure rate gradually increases as the service period increases, so the value of the parameter m is m> 1.

  Then, the failure rate calculation unit 121 inputs the parameters specified in the parameter table 181 to the equation (10), calculates the failure rate λ at a predetermined time t, for example, as shown in FIG. In the failure rate table 182 as described above, the time t and the failure rate at this time t are registered in association with each other.

  Further, the failure rate calculation unit 121 plots the time t registered in the failure rate table 182 and the failure rate at the time t on coordinates as shown in FIG. 5, for example, and specifies the failure rate curve 183. .

  Note that the failure rate table 182 as shown in FIG. 4 and the failure rate curve 183 as shown in FIG. 5 calculated in this way are the initial setting information storage area 112 in the storage unit 110 described later. To remember.

  The failure rate correction unit 122 corrects the failure rate calculated by the failure rate calculation unit 121 using a correction coefficient.

  For example, the failure rate of a part is considered to change depending on the situation and environment in which the part is used. Therefore, in the present embodiment, the failure rate is corrected by measuring the state and environment in which the component is used with various sensors.

In this regard, when the failure rate calculated by the failure rate calculation unit 121 is λ and the correction factor of the failure rate is μ, the corrected failure rate λ _C is calculated as the following equation (11).

In the present embodiment, the occurrence time of the accidental failure (initial failure end time) is γ _g , and the wear failure occurrence time (end of accidental failure) is γ _e , the following equations (12) and (13): It is corrected like the formula.

  Here, the value of μ may be appropriately calculated from past experience, experimental results, theoretical values, and the like.

  In the present embodiment, the value of μ is corrected based on the ambient temperature of the component.

For example, in the present embodiment, a correction graph 184 as shown in FIG. 6 is stored in a correction information storage area 113 of the storage unit 110 described later, and the failure rate correction unit 122 corrects the failure rate. 6 is read from the correction graph 184 of FIG. 6 and multiplied by the failure rate λ calculated by the failure rate calculation unit 121, and the onset time γ _g, to correct by dividing the gamma _e.

The failure rate function λ _C (t) corrected as described above is expressed by the following equation (14).

Further, a failure rate curve in which the corrected failure rate function λ _C (t) is plotted is as shown in FIG.

  When the correction coefficient μ has a positive value, as shown in FIG. 8, the failure rate correction unit 122 performs correction so that the initial failure period s, the accidental failure period g, and the wear failure period e are , S ′, g ′, and e ′, respectively, and the failure rate λ at each time t increases.

  The prediction unit 123 calculates the number of failures in a predetermined period of the target component.

Specifically, first, a part whose failure number is to be calculated is specified, the parameter table 181 of this part is read from the initial setting information storage area 112, and the failure rate calculation unit 121 calculates the failure rate. Then, the failure rate calculated by the failure rate calculation unit 121 is corrected by the failure rate correction unit 122, and the corrected failure rate of a specific component is specified. Further, the lifetime t ₁ of the target component is calculated by adding the initial failure period and the accidental failure period of the specified corrected failure rate. By dividing the predetermined period T in life t ₁ of the target component calculated in this manner, to calculate the number of faults N _a target component by life t ₁ at a predetermined period T (see FIG. 9). In the case where not divisible predetermined period T in life t _1, the decimal point is rounded down.

Next, the prediction unit 123 integrates the corrected failure rate function λ _C (t) in the period 0 to t ₁ as expressed in the equation (15), so that the failure in the initial failure and the accidental failure is performed. The number _Nb is calculated.

Furthermore, the prediction unit 123, a residual period _{t 2} when the predetermined time period T has not divisible by life _{t 1} calculated in (16) below, the integrated value _{N C} in the remaining period _{t 2} (17) Calculate with the formula.

Then, the total number of failures N in the period T of the target component is calculated by adding N _a , N _b , and N _c calculated as described above as in Expression (18).

  The total failure number N predicted in this way is stored in a prediction information storage area 114 of the storage unit 110 described later.

  Further, when the target part fails within a predetermined period T and is replaced with a new part, the prediction unit 123 calculates the number of failures in the remaining period T ′ from the time of replacement (FIG. 10).

  Specifically, first, the remaining period T ′ is calculated by subtracting the period until the replacement time from the predetermined period T.

Then, 'by dividing the target component life t _1, the remaining period T' remaining period T to calculate the number of failures target component N _{a 'by} lifetime t ₁ at. If the remaining period T ′ cannot be divided by the life t ₁ , the decimal part is rounded down.

Further, the prediction unit 123 calculates the remaining period t ₂ ′ when the remaining period T ′ is not divisible by the life t ₁ by the following equation (19), and calculates the integrated value N _C ′ during the remaining period t ₂ ′. It calculates with (20) Formula.

Then, N _a ′ and N _c ′ calculated as described above and N _b calculated as described above are added as shown in the equation (21), so that all the remaining periods T ′ of the target part can be obtained. The number of failures N ′ is calculated.

  The total number of failures N ′ in the remaining period T ′ predicted in this way is stored in a prediction information storage area 114 of the storage unit 110 described later.

  The field information collection unit 124 collects information on the usage state of the parts that are actually used, and generates a field information table 185 as shown in FIG. 7, for example. This field information table 185 is created for each part for which field information is to be acquired at predetermined intervals (in this embodiment, every day) and stored in a field information storage area 115 described later. .

  When a failure occurs in a part for which the field information table 185 is created, the field correction unit 125 reads the field information table 185 of the part on the day when the failure occurs, and the operation time (operation The total time) registered in the time column 185y and adding to the total operation time up to today registered in the total operation time registration column 185q up to today in the field information table 185 on the previous day of the part. The accumulated operation time is calculated and registered in the accumulated operation time column 185h until the failure occurs. In addition, the corrected operation time (registered in the corrected operation time column 185z) on the failure date is summed and added to the corrected operation time accumulation up to today registered in the correction operation time accumulation 185r up to today in the field information table 185 of the previous day. As a result, the total corrected operation time until failure occurs is calculated and registered in the corrected operation time total column 185k until failure occurs.

  In addition, the field correction unit 125 calculates the total corrected operation time until the failure occurs in the field information table of the same type part that has already failed (the part in which the same identification ID as the failed part is registered in the type registration column). By referring to the column of accumulated corrected operation time until occurrence, the failure rank of the part that has failed this time is determined, and the rank is registered in the failure rank registration field 185f, and the failure rank of the same type of part that has already failed is determined. Correct it. Here, the failure ranks are given so that the sequential number starts from the number “1” in order from the shortest corrected operation time. This failure order is reviewed each time a component failure occurs.

Further, the field correction unit 125 calculates an average value (in this embodiment, a weighted average) of correction coefficients registered in the correction coefficient registration field 185x of the field information table 185 on the date of failure of the failed component, is added to the total correction coefficient mu ₂ registered in the cumulative correction coefficient mu ₂ registration field until today on the day before the field information table is divided by the number of days from production start date to failure date, a running The average correction coefficient is calculated and registered in the operating average correction coefficient registration field 185l.

Then, the field correction unit 125 counts the total number of the same-type components that are in operation at the time of failure from the information stored in the target component information storage area 111 (and counts the failed components), and the total number is M. Then, the field failure rate λ _F is calculated from the following equation (22), and the calculated value is registered in the failure rate registration field 185g.

  The field correction unit 125 calculates the corrected failure rate by dividing the failure rate calculated by the equation (22) by the average correction coefficient during operation, and registers the calculated failure rate in the corrected failure rate registration field 185i.

Then, the field correction unit 125 calculates the cumulative operation time until the occurrence of the failure calculated as described above is the occurrence time of the accidental failure (initial failure end time) γ _gC and the occurrence time of the wear failure (accidental failure). It is determined whether the generated failure is an initial failure, an accidental failure, or a wear failure based on whether or not γ _eC is exceeded. Then, for failures that include the current failure (initial failure, accidental failure, or wear failure), the corrected failure rate accumulation is calculated by adding the corrected failure rates from the highest failure order to the current failure, respectively. Thus, it is registered in the corrected failure rate accumulation column 185j.

  For parts that have a failure order after the failure order of the current failure due to the current failure and have caused the same type of failure (initial failure, accidental failure, or wear failure) as the current failure, As the failure occurs, the corrected failure rate cumulative value changes, and these are also recalculated.

  Then, the field correction unit 125 converts the corrected failure rate cumulative value calculated as described above and the corrected operation time cumulative up to the occurrence of the failure into a logarithmic In, and is known for each of the initial failure, the accidental failure, and the wear failure. The approximate straight line is calculated by the method, and the slope A and intercept B are obtained.

  For example, as shown in FIG. 11, the calculated corrected failure rate cumulative value and the corrected operation time accumulated until the failure occurrence are plotted on a log-log graph for each of the initial failure, the accidental failure, and the wear failure. An approximate straight line may be calculated to determine the slope A and the intercept B.

  Here, in FIG. 11, the straight line 186a is an approximate line for initial failure, the straight line 186b is an approximate line for accidental failure, and the straight line 186c is an approximate line for wear failure.

On the other hand, the corrected failure rate function λ _C (t) expressed by the equation (14) is transformed as the equation (23).

Then, when equation (23) is integrated over time γ _{N to} t, the following equation (24) is obtained.

  Furthermore, when the logarithm of the equation (24) is taken, the equation (25) is obtained.

From the equation (25), the field correction unit 125 compares the slope A calculated as described above with the parameter m of the parameter table 181 and compares the intercept B with the logarithm of the parameter t ₀ of the parameter table 181. When the difference between them exceeds a predetermined threshold, the values of m and t ₀ stored in the parameter table 181 are replaced with the calculated values of A and B.

  When the parameter table 181 is rewritten by the field correction unit 125, the failure rate calculation unit 121 calculates a failure rate based on the new parameter, and the failure rate correction unit 122 corrects the failure rate. The prediction unit 123 calculates the number of failures of the changed part in a predetermined period.

  The time measuring unit 126 generates time information such as day, hour, minute from a signal obtained from an RTC (Real Time Clock) or the like.

  The input unit 130 is an input device such as a keyboard or a mouse.

  The IF unit 140 is an interface for inputting and outputting signals obtained from sensors and the like.

  The management support apparatus 100 configured as described above can be realized by a so-called computer. For example, the storage unit 110 can be realized by an external storage device such as a hard disk, and includes a failure rate calculation unit 121, a failure rate correction unit 122, a prediction unit 123, a field information collection unit 124, a field correction unit 125, and a time measurement unit 126. Can be realized by a CPU (Central Processing Unit) executing a predetermined program stored in an external storage device such as a hard disk, and the IF unit is a NIC (Network Interface Card) or USB (Universal Serial Bus). It can be realized by an interface such as

  Processing performed by the management support apparatus 100 configured as described above will be described below.

  FIG. 12 is a flowchart showing an overall flow of processing performed by the management support apparatus 100.

  First, in order to identify the component to be managed, the management support device 100 inputs at least the component type and the component ID and the failure rate curve in the component information table 180 as shown in FIG. The input of the parameter table 181 as shown in FIG. 3 is requested for each part (S200).

  When the target part information and the initial setting information are input via the input unit 130 by the operator of the management support apparatus 100 in step S200, the failure rate calculation unit 121 of the management support apparatus 100 performs the following for each input component. A failure rate function for each component is specified by specifying the parameter of the equation (10) from the input initial setting information (S201).

  And the failure rate calculation part 121 of the management assistance apparatus 100 correct | amends the failure rate function identified by step S201 based on the correction information memorize | stored in the correction information storage area 113 (S202). Here, in the present embodiment, the failure rate function is corrected based on the ambient temperature of the component to be managed. Therefore, here, the operator of the management support apparatus 100 inputs the ambient temperature of the component. The failure rate function is corrected by inputting via the unit 130.

  When the operator of the management support apparatus 100 specifies the component ID (or product ID) and the use period and the use start date are specified via the input unit 130, the prediction unit 123 of the management support apparatus 100 The number of component failures in the use period from the set use start date is calculated using equations (15) to (21) (S204). Thus, in this embodiment, since the number of failures in a predetermined period of components constituting the apparatus can be predicted, the inventory of such components can be managed appropriately.

  When the product ID is specified, the parts included in the product specified by the product ID are extracted from the target part information storage area 111, and all the extracted parts are used from the start date of use. Calculate the number of component failures in the period.

  When the operator of the management support apparatus 100 identifies the component ID (or product ID) and the usage period and the usage start date are identified via the input unit 130, the field information collection unit 124 Every time, a field information table 185 as shown in FIG. 7 is generated every day and stored in the field information storage area 115 (S205). The field information table 185 is created before the recording date starts, and information necessary in a timely manner is registered.

  Furthermore, when a failure occurs in the managed component, the management support apparatus 100 corrects the failure rate function and the predicted number of components (S206). This process will be described in detail with reference to FIG.

  FIG. 13 is a flowchart showing the creation process of the field information table 185.

  First, the field information collection unit 124 acquires temperature information from the sensors attached around the component that is the target of the field information table 185 via the IF unit 140, and registers the temperature information in the corresponding temperature registration field 185w. (S210).

  The correction coefficient corresponding to the registered temperature is read from the correction graph 184 (see FIG. 6) stored in the correction information storage area 113 and registered in the corresponding correction coefficient registration field 185x (S211).

  Further, the field information collecting unit 124 receives, from the sensor attached to the power source of the component (or the device to which the component is attached) of the field information table 185 via the IF unit 140, When the information regarding the start or stop is acquired (S212), the start or stop identification code is registered in the corresponding start / stop registration field 185v (S213). In the present embodiment, when the power supply is started or stopped, an identification code “1” is registered in the start / stop registration field 185v corresponding to the time when the power is started or stopped.

  In addition, the field information collection unit 124 acquires information on the operation state of the power source of the component (or the device to which the component is attached) of the field information table 185 via the IF unit 140. In the driving state (S214), the driving time at the time corresponding to the corresponding time number is counted via the time measuring unit 126, and the driving time is registered in the corresponding driving time registration field 185y ( S215). Whether or not the vehicle is in an operating state is determined by a signal obtained from a sensor attached to the power supply of the component (or the device to which the component is attached) as a target of the field information table 185 as described above. You can judge by.

  Further, the operation time registered in the operation time registration field 185y is multiplied by the corresponding correction coefficient to calculate the correction operation time, and is registered in the corresponding correction operation time registration field 185z (S216).

  The above processing is performed until the creation target date of the field information table 185 ends. When the target date ends (S217), the field information collection unit 124 sets the time registered in the operation time registration field 185y. By adding all, today's working time is calculated and registered in today's working time registration field 185n (S218).

  Further, the field information collection unit 124 searches the field information table created on the previous day of the part that is the target of the field information table 185, and registers the accumulated operating hours up to today of the field information table created on the previous day. The cumulative value registered in the column is acquired, and the total of the operating hours up to today is calculated by adding the operating time registered in the operating time registration column 185n of today on the target date to the acquired cumulative value. Until it is registered in the accumulated operating time registration field 185q (S219). If there is no field information table on the previous day of the target part, the operation time registered in the operation time registration column 185n of today is the cumulative value of the operation time.

  Next, the field information collection unit 124 calculates the corrected operation time by adding all the corrected operation times registered in the corrected operation time registration field 185z, and registers the corrected operation time in the today's correction operation time registration field 185o (S220). .

  Further, the field information collection unit 124 searches the field information table created on the previous day of the part that is the target of the field information table 185, and accumulates the corrected operation time up to today in the field information table created on the previous day. By acquiring the cumulative value registered in the registration field and adding the corrected working time registered in today's corrected working time registration field 185o on the target date to the acquired cumulative value, the corrected working time cumulative up to today is calculated. It is calculated and registered in the corrected operating time cumulative registration column 185r up to today (S221). If there is no field information table on the previous day of the target component, the corrected operating time registered in the corrected operating time registration field 185o of today is the accumulated value of the corrected operating time.

Then, the field information collection unit 124 calculates the average value μ ₁ of today's correction coefficient by calculating the average value of correction coefficients registered in the correction coefficient registration field 185x (weighted average in this embodiment). registers today of the correction coefficient mu ₁ registration field 185p (S222).

Further, the field information collecting unit 124 searches the field information table created on the previous day of the part that is the target of the field information table 185, and accumulates the correction coefficient μ up to today on the field information table created on the previous day. ₂ obtains a cumulative value registered in the registration field, to multiplication uptime cumulative to date field information table created in the previous day, today in a subject date today of the correction coefficient mu ₁ in a subject Date Is multiplied by the total operating time up to today, and divided by the total operating time up to today on the target date to calculate the cumulative correction coefficient μ ₂ up to today, in the cumulative correction coefficient μ ₂ registration field 185 s up to today Register (S223). If there is no field information table created on the previous day, the correction coefficient registered in the correction coefficient μ ₁ registration column for today is the cumulative value μ ₂ .

  FIG. 14 is a flowchart illustrating processing when a failure occurs in a component to be managed.

  First, the operator of the management support apparatus 100 specifies the component ID (in-model consistent management No.) via the input unit 130, calls the field information table 185 from the field information storage area 115, and displays a failure in the failure occurrence date registration field 185d. When the occurrence date is registered (S230), the field correction unit 125 performs the process of creating the field information table 185, that is, the process from step S210 to step S216 in FIG. 13, via the field information collection unit 124. At the same time, the processing from step S218 to step S223 is executed on the assumption that the target date has ended (S231). If the operator input date is later than the component failure date, the processing in step S231 has already been performed and is unnecessary.

  Then, the field correction unit 125 totals the operation time on the failure date (registered in the operation time column 185y) and adds the operation time accumulated in the operation time accumulation registration column 185q up to today of the field information table 185 of the previous day. By summing up, the accumulated operation time until the failure occurs is calculated and registered in the accumulated operation time column 185h until the failure occurs (S232). If there is no previous day's field information table 185 or if the operator's input date is after the failure date of the part, the registered value in the accumulated operating time registration column 185q up to today on the failure date Register in the accumulated operating time registration field 185h.

Further, by dividing the number of days in a total correction coefficient mu ₂ registered in the cumulative correction coefficient μ2 registration field 185s to today from running start date to failure date, calculating an average correction coefficient of the running, running It is registered in the average correction coefficient registration field 185l (S233).

  Further, the cumulative value of the operation time until the occurrence of the failure calculated in step S232 is multiplied by the average correction coefficient calculated in step S233, thereby calculating the cumulative value of the corrected operation time until the occurrence of the failure. It is registered in the corrected operation time cumulative registration column 185k (S234).

  It is determined whether the cumulative value of the corrected operation time calculated in step S234 is classified into an initial failure, an accidental failure, or a wear failure in the parameter table 181 stored in the initial setting information storage area 112 ( S235).

  Further, the failure ranking X of the same type of parts (parts registered with the same identification ID as the failed part in the type registration field 185a) is calculated from the cumulative value of the corrected operation time calculated in step S234, and the failure is calculated. Registration is made in the rank registration field 185f (S236). In addition, about a failure order | rank, a serial number is attached in an order from the thing with the short accumulated value of correction | amendment operation time in the goods of the same model.

  In addition, the field correction unit 125 calculates the number of parts of the same type that are currently in operation (the part that has failed this time is also counted) from the field information table 185 stored in the field information storage area 115. Then, the failure rate is calculated from the reciprocal of the calculated operation number, and registered in the failure rate registration field 185g (S237).

  Then, the field correction unit 125 calculates the corrected failure rate by dividing the failure rate calculated in step S237 by the average correction coefficient calculated in step S233, and registers it in the corrected failure rate registration field 185i (S238). .

  Next, the field correction unit 125 searches the field information table for parts having the same format and having a failure order of X or later (except for the part that has failed this time), and sets the failure order to “1”. Is incremented to correct the failure order (S239).

  The field correction unit 125 is a component of the same type and belongs to the same failure type as the currently failed component from the accumulated value registered in the corrected operation time accumulated registration column 185k until the failure occurs. By reading the field information table of the failure ranking X-1, reading the accumulated value registered in the corrected failure rate cumulative registration column, and adding the corrected failure rate of the part that has failed this time, the corrected failure rate The cumulative value is calculated and registered in the corrected failure rate cumulative registration field 185j (S240).

  The field correction unit 125 is a component of the same type and belongs to the same failure type as the currently failed component from the accumulated value registered in the corrected operation time accumulated registration column 185k until the failure occurs. , Read out the field information table of the failure rank after X + 1, and add the corrected failure rate of the part that has failed this time to the accumulated value registered in the corrected failure rate accumulated registration column, respectively, so that the corrected failure rate accumulated value Correction is performed (S241).

  Next, the field correction unit 125 corrects the cumulative failure rate of components of the same type that are determined to belong to the same failure type from the cumulative value registered in the corrected operation time cumulative registration column 185k until the failure occurs. Is calculated, an approximate line of the calculated value is calculated, and the slope and intercept of the approximate line are calculated (S242).

The inclination calculated in step S242 is stored in the initial setting information storage area 112, and the parameter m of the corresponding failure type in the parameter table 181 stored in the initial setting information storage area 112 and the intercept calculated in step S242 are stored in the initial setting information storage area 112. Is compared with the logarithm ln of the parameter t ₀ (S 243), and if the difference between them is equal to or greater than a predetermined threshold (S 244), the calculated slope value or intercept exponential function (exp) value is used. The parameter is replaced with the corresponding failure type parameter (S245).

  When the parameters are exchanged, the failure rate calculation unit 121 calculates a failure rate curve based on the exchanged parameters, the failure rate correction unit 122 corrects the failure rate curve, and the prediction unit 123 calculates the number of component failures based on the corrected failure rate curve (S246).

  According to the management support apparatus 100 configured as described above, since the number of component failures in a predetermined period can be predicted, by managing the components based on the number of failures, appropriate inventory management can be performed. It can be carried out.

  For example, assuming that the lifetime or usage period of the device where the managed component is installed is a predetermined period for predicting the number of component failures, the number of failures of the component is calculated and the number of components corresponding to the number of failures By holding as stock, appropriate inventory management can be performed.

  In this regard, the number of parts to be managed is stored in the storage unit 110 (for example, by an operator's input), and the shortage is calculated by comparing the stored number of inventory with the number of failures. It is also possible to display the information on an output device such as an operator and inform an operator or the like.

  In addition, when purchasing managed parts every predetermined period, calculate the number of faults of parts from the current purchase time to the next purchase time, and the number of existing stock or current stock It is also possible to subtract the number obtained by subtracting the number of failures up to the current purchase time from the number of failures from the number of failures up to the next purchase time and hold it in the inventory as the current purchase number.

  Furthermore, for example, when the supply of a part is stopped during the period of use of the product in which the part is used, the number of parts required during the lifetime of the product or the period of use is calculated. By keeping the number of parts in stock as stock, it is possible to prevent parts from being out of stock during the period of use of the product.

  In the embodiment described above, only the correction coefficient that corrects the failure rate curve changes with temperature. However, the present invention is not limited to this mode. For example, the component (or the component is Correction factor due to the ambient humidity of the product used), correction factor due to the high power supply voltage to the component (or product in which the component is used), component (or product in which the component is used) Correction factor due to the strength of vibration given to the component, correction factor due to the impact strength given to the component (or product in which the component is used), component (or product in which the component is used) Correction factor due to the amount of ambient dust, correction factor due to the amount of corrosive gas around the part (or product in which the part is used), radiation around the part (or product in which the part is used) The amount by the correction factor, component (or product parts are used) even using a correction factor due uptime, also may be used in combination thereof (the temperature be included) as appropriate.

In the embodiment described above, the lifetime of the component is set by adding the initial failure period and the accidental failure period. However, the present invention is not limited to such a mode. ₃ can be used. In such a case, the number of failures is calculated as follows.

First, a part whose failure count is to be calculated is specified, the parameter table 181 for this part is read from the initial setting information storage area 112, and the failure rate calculation unit 121 calculates the failure rate. Then, the failure rate calculated by the failure rate calculation unit 121 is corrected by the failure rate correction unit 122, and the corrected failure rate of a specific component is specified. Further, the accidental failure period with the specified corrected failure rate is defined as the life t ₃ of the target part, and the predetermined period T is divided by this life t ₃ to obtain the number N of target part failures due to the life t ₃ in the predetermined period T. _d is calculated. In the case where not divisible predetermined period T in life t _3, the decimal point is omitted.

Next, the prediction unit 123 uses the corrected failure rate function λ _C (t) in the period t ₃ (t _{4 to} t ₅ : t _{4 as} the start of the accidental failure period, as expressed in the equation (26). , t ₅ is by integrating at the end of the accidental failure period), calculates the number of faults N _e in random failure.

Furthermore, the prediction unit 123, a residual period _{t 6} when the predetermined period T is not divisible by life _{t 3} calculated in (27) below, the integrated value _{N f} in the remaining period _{t 6} (28) Calculate with the formula.

Then, N _d , N _e , and N _f calculated as described above are added as shown in equation (29), thereby calculating the total number of failures N in the period T of the target component.

  In the embodiment described above, the failure rate function λ (t) in the Weibull function is used. However, the failure rate function λ (t) is not limited to such a mode. It is also possible to use a rate function.

1 is a schematic diagram of a management support apparatus 100. FIG. 3 is a schematic diagram of a component information table 180. FIG. 3 is a schematic diagram of a parameter table 181. FIG. Schematic of the failure rate table 182. FIG. Schematic of the failure rate curve 183. FIG. Schematic of the correction graph 185. FIG. Schematic of the field information table 185. Explanatory drawing of a failure rate curve. Explanatory drawing at the time of calculating the number of failures. Explanatory drawing at the time of calculating the number of failures. Explanatory drawing showing the process which plots a correction | amendment failure rate accumulation value and the correction | amendment driving | operation time accumulation to failure occurrence on a log-log graph. 5 is a flowchart showing the overall flow of processing performed by the management support apparatus 100. The flowchart which shows the creation process of the field information table 185. The flowchart which shows the process when a failure arises in the components used as management object.

Explanation of symbols

100 management support device 110 storage unit 111 target part information storage region 112 initial setting information storage region 113 correction information storage region 114 prediction information storage region 115 field information storage region 121 failure rate calculation unit 122 failure rate correction unit 123 prediction unit 124 field information Collection unit 125 Field correction unit 126 Time measurement unit 130 Input unit 140 IF unit

Claims (16)

A management support device that supports the management of parts,
A storage unit that stores a failure rate function indicating a rate of failure with respect to usage time, and an arithmetic unit;
The computing unit is
A process of calculating a first number by specifying a lifetime that is the lifetime of a specific component from the failure rate function, and calculating a number that includes the lifetime in a predetermined period;
A process of calculating a second number by multiplying the failure rate function integrated over the lifetime over the first number;
A process of calculating the number of failures in the predetermined period of the specific component by adding the first number and the second number;
Management support apparatus characterized by performing. The management support apparatus according to claim 1,
The computing unit is
A process of calculating a remaining period by subtracting from the predetermined period the product of the lifetime number multiplied by the first number;
A process of calculating a third number by integrating the failure rate function in the remaining period;
And further
The calculation unit performs a process of calculating the number of failures in the predetermined period of the specific component by adding the first number, the second number, and the third number. thing,
Management support device characterized by this. The management support apparatus according to claim 1 or 2,
The storage unit stores correction information for correcting the failure rate function according to the usage status of the specific component,
The management support apparatus, wherein the calculation unit calculates the failure rate using a failure rate function corrected by the correction information. The management support device according to claim 3,
The management support apparatus according to claim 1, wherein the correction information is a correction coefficient by which the failure rate function is multiplied in accordance with a usage status of the specific component. The management support apparatus according to any one of claims 1 to 4,
The computing unit is
When the specific part fails, a process for calculating a current failure rate that is an actual failure rate by calculating the reciprocal of the number of operating parts of the same type as the specific part;
A process of calculating the failure rate function from the current failure rate when the failure rate obtained by the failure rate function is compared with the current failure rate, and the difference between them exceeds a predetermined threshold;
A process of replacing the failure rate function stored in the storage unit with a failure rate function calculated from the current failure rate;
Management support apparatus characterized by performing. The management support apparatus according to any one of claims 1 to 4,
In the storage unit, for each failed component, the current failure rate calculated by the reciprocal of the number of operations of the same type component when the failed component fails, and the operation period until the failed component fails And a plurality of field information including:
The computing unit is
From the failure rate function, a plurality of times and failure rates for each hour are calculated and accumulated in order from the shortest time to the cumulative value for each hour, and the short time A process of calculating the failure rate cumulative value as a cumulative value for each time by accumulating the failure rate corresponding to the time in order from
Calculating a logarithm of the time cumulative value and the failure rate cumulative value, calculating an approximate line, and identifying a first slope and a first intercept of the approximate line;
The operation period is accumulated in order from the shortest period, and the operation period cumulative value as a cumulative value for each operation period, and the current failure rate corresponding to the operation period is accumulated in order from the shortest operation period A process of calculating a current failure rate cumulative value as a cumulative value for each operating time;
Calculating the logarithm of the accumulated operating time value and the accumulated current failure rate, calculating an approximate line, and specifying the second slope of the approximate line and the second intercept;
When comparing the first slope and the second slope, the first intercept and the second intercept, and the difference between them is equal to or greater than a predetermined threshold, the second slope And identifying a failure rate function from the second intercept, replacing the identified failure rate function with a failure rate function stored in the storage unit,
Management support apparatus characterized by performing. The management support apparatus according to any one of claims 1 to 4,
In the storage unit,
For each failed component, a plurality of current failure rates calculated by the reciprocal of the number of operating parts of the same type when the failed component fails, and an operation period until the failed component fails Field information and
In the failure rate function, a plurality of times and failure rates for each hour are calculated and accumulated in order from the shortest time to the cumulative value for each hour, and the short time The failure rate corresponding to the time is accumulated in order, and the failure rate cumulative value is calculated as the cumulative value for each time, and the logarithm of the time cumulative value and the failure rate cumulative value is calculated and approximated. Parameter information for calculating a straight line and specifying the second slope of the approximate straight line and the second intercept;
Is remembered,
The computing unit is
The operation period is accumulated in order from the shortest period, and the operation period cumulative value as a cumulative value for each operation period, and the current failure rate corresponding to the operation period is accumulated in order from the shortest operation period A process of calculating a current failure rate cumulative value as a cumulative value for each operating time;
Calculating the logarithm of the accumulated operating time value and the accumulated current failure rate, calculating an approximate line, and specifying the second slope of the approximate line and the second intercept;
When comparing the first slope and the second slope, the first intercept and the second intercept, and the difference between them is equal to or greater than a predetermined threshold, the second slope And identifying a failure rate function from the second intercept, replacing the identified failure rate function with a failure rate function stored in the storage unit,
Management support apparatus characterized by performing. Computer
A storage unit that stores a failure rate function indicating a failure rate with respect to usage time, and a program that functions as a calculation unit,
The computing means is
A process of calculating a first number by specifying a lifetime that is the lifetime of a specific component from the failure rate function, and calculating a number that includes the lifetime in a predetermined period;
A process of calculating a second number by multiplying the failure rate function integrated over the lifetime over the first number;
A process of calculating the number of failures in the predetermined period of the specific component by adding the first number and the second number;
The program characterized by performing. The program according to claim 8, wherein
The computing means is
A process of calculating a remaining period by subtracting from the predetermined period the product of the lifetime number multiplied by the first number;
A process of calculating a third number by integrating the failure rate function in the remaining period;
And further
The computing means performs a process of calculating the number of failures in the predetermined period of the specific component by adding the first number, the second number, and the third number;
A program characterized by The program according to claim 8 or 9, wherein
The storage means stores correction information for correcting the failure rate function according to the usage status of the specific part,
The calculation means calculates the failure rate using a failure rate function corrected by the correction information. The program according to claim 10,
The program according to claim 1, wherein the correction information is a correction coefficient by which the failure rate function is multiplied in accordance with a usage status of the specific component. A program according to any one of claims 8 to 11,
The computing means is
When the specific part fails, a process for calculating a current failure rate that is an actual failure rate by calculating the reciprocal of the number of operating parts of the same type as the specific part;
A process of calculating the failure rate function from the current failure rate when the failure rate obtained by the failure rate function is compared with the current failure rate, and the difference between them exceeds a predetermined threshold;
A process of replacing the failure rate function stored in the storage unit with a failure rate function calculated from the current failure rate;
The program characterized by performing. A program according to any one of claims 8 to 11,
The storage means includes, for each failed component, a current failure rate calculated by the reciprocal of the number of operations of the same type component when the failed component fails, and an operation period until the failed component fails And a plurality of field information including:
The computing means is
From the failure rate function, a plurality of times and failure rates for each hour are calculated and accumulated in order from the shortest time to the cumulative value for each hour, and the short time A process of calculating the failure rate cumulative value as a cumulative value for each time by accumulating the failure rate corresponding to the time in order from
Calculating a logarithm of the time cumulative value and the failure rate cumulative value, calculating an approximate line, and identifying a first slope and a first intercept of the approximate line;
The operation period is accumulated in order from the shortest period, and the operation period cumulative value as a cumulative value for each operation period, and the current failure rate corresponding to the operation period is accumulated in order from the shortest operation period A process of calculating a current failure rate cumulative value as a cumulative value for each operating time;
Calculating the logarithm of the accumulated operating time value and the accumulated current failure rate, calculating an approximate line, and specifying the second slope of the approximate line and the second intercept;
When comparing the first slope and the second slope, the first intercept and the second intercept, and the difference between them is equal to or greater than a predetermined threshold, the second slope And identifying a failure rate function from the second intercept, replacing the identified failure rate function with a failure rate function stored in the storage unit,
The program characterized by performing. A program according to any one of claims 8 to 11,
In the storage means,
For each failed component, a plurality of current failure rates calculated by the reciprocal of the number of operating parts of the same type when the failed component fails, and an operation period until the failed component fails Field information and
In the failure rate function, a plurality of times and failure rates for each hour are calculated and accumulated in order from the shortest time to the cumulative value for each hour, and the short time The failure rate corresponding to the time is accumulated in order, and the failure rate cumulative value is calculated as the cumulative value for each time, and the logarithm of the time cumulative value and the failure rate cumulative value is calculated and approximated. Parameter information for calculating a straight line and specifying the second slope of the approximate straight line and the second intercept;
Is remembered,
The computing means is
The operation period is accumulated in order from the shortest period, and the operation period cumulative value as a cumulative value for each operation period, and the current failure rate corresponding to the operation period is accumulated in order from the shortest operation period A process of calculating a current failure rate cumulative value as a cumulative value for each operating time;
Calculating the logarithm of the accumulated operating time value and the accumulated current failure rate, calculating an approximate line, and specifying the second slope of the approximate line and the second intercept;
When comparing the first slope and the second slope, the first intercept and the second intercept, and the difference between them is equal to or greater than a predetermined threshold, the second slope And identifying a failure rate function from the second intercept, replacing the identified failure rate function with a failure rate function stored in the storage unit,
The program characterized by performing. A management support method for supporting the management of parts in a management support device comprising a storage unit that stores a failure rate function indicating a rate of failure with respect to usage time, and a calculation unit,
The calculation unit specifies a lifetime that is a lifetime of a specific component from the failure rate function, and calculates a first number by calculating a number that includes the lifetime in a predetermined period. Calculation process,
A second calculation step in which the arithmetic unit calculates a second number by multiplying the failure rate function integrated over the lifetime by the first number;
The calculation unit calculates the number of failures in the predetermined period of the specific component by adding the first number and the second number,
Management support method characterized by performing The management support method according to claim 15, comprising:
A remaining period calculation step in which the arithmetic unit calculates a remaining period by subtracting the product of the first period and the first number from the predetermined period;
A third calculating step in which the arithmetic unit calculates a third number by integrating the failure rate function in the remaining period;
Further comprising
In the failure week calculation process, the calculation unit calculates the number of failures in the predetermined period of the specific component by adding the first number, the second number, and the third number. The process of
Management support method characterized by this.

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