CN110727921A - Normal type universal part spare part demand calculation method and device - Google Patents
Normal type universal part spare part demand calculation method and device Download PDFInfo
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Abstract
The invention relates to a normal type general part spare part demand calculation method and a device. The method comprehensively considers the demand of the spare parts from the overall demand of all equipment, and fully considers the interchangeability characteristic of the universal parts, so that the calculated final demand of the spare parts can be fit with the actual demand to a great extent, and the excessive purchasing of the universal parts and the waste are avoided.
Description
Technical Field
The invention relates to the technical field of equipment maintenance, in particular to a method and a device for calculating the demand of normal general spare parts.
Background
Normal distributions are often used to describe the life distribution of mechanical-type units, such as slip rings, gearboxes, speed reducers, and the like. And the common part is a unit having interchangeability among products of different types or the same type and different specifications. The normal type general part refers to a general part with the unit life complying with normal distribution, and the life X complying with normal distribution is recorded as X-N (mu, sigma)2) Where μ is the mean parameter, σ is the root variance parameter, and the density of XFunction is as
The universal part has high universality, so that the universal part can be used in a wide range of products. In general, the amount of spare parts required is calculated with the goal of satisfying the spare part requirement of a certain equipment. For general-purpose parts, the methods adopted in the past are as follows: firstly, the spare part demand of each equipment is respectively calculated, and then the sum of all the spare parts is taken as the final spare part demand. The method does not consider the interchangeability characteristic of general parts actually, does not comprehensively consider the demand of spare parts from the overall demand of all equipment, and causes the excessive purchase of general parts and spare parts to cause waste.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a normal type general part demand calculation method and device, which fully consider the interchangeability characteristic of general parts and comprehensively consider the demand of spare parts from the overall demand of all equipment.
The technical scheme for solving the technical problems is as follows:
in a first aspect, the invention provides a method for calculating the demand of spare parts of normal general parts, which comprises the following steps:
s1, initializing the spare part number S, and making S equal to 0;
S2，i＝1；
s3, calculating an array p1, wherein the array comprises S +1 elements,
order to
Wherein, TiI is more than or equal to 1 and less than or equal to N, wherein N is the total number of equipment using the universal part;
s4, if i is equal to 1, let p2 be p 1; otherwise, let p2 be p1 p2, where is the sign of convolution;
s5, let i equal to i +1, if i is less than or equal to N, go to step S3, otherwise let i equal to N
Then, jumping to step S6;
s6, judging PSWhether the requirement of spare part guarantee is met or not is judged, namely P is judgedSWhether it is less than the lowest spare part satisfaction rate P1, if PSIf P1 is less than the preset value, S is set to S +1, and the process goes to step S2, otherwise, the calculation is terminated and the current value of S is output as the final spare part demand.
The invention has the beneficial effects that: the spare part demand is comprehensively considered from the overall demand of all equipment, and the interchangeability characteristic of general parts is fully considered, so that the final spare part demand obtained by calculation can be fit with the actual demand to a great extent, and the phenomenon that general parts are excessively purchased is avoided, and waste is caused.
In a second aspect, the present invention provides a normal type general-purpose component demand amount calculation apparatus, including:
an input module for setting the equipment number N, the minimum spare part satisfaction rate P1 and the working time T planned by the general parts in each equipment every yeari，1≤i≤N；
The calculating module is used for calculating the demand of spare parts of the universal parts; the specific calculation method is as follows:
s1, initializing the spare part number S, and making S equal to 0;
S2，i＝1；
s3, calculating an array p1, wherein the array comprises S +1 elements,
order to
Wherein, TiThe working time of the universal piece planned in the ith equipment every year is represented, and i is more than or equal to 1 and less than or equal to N;
s4, if i is equal to 1, let p2 be p 1; otherwise, let p2 be p1 p2, where is the sign of convolution;
s5, let i equal to i +1, if i is less than or equal to N, go to step S3, otherwise let i equal to N
Then, jumping to step S6;
s6, judging PSWhether the requirement of spare part guarantee is met or not is judged, namely P is judgedSWhether it is less than the lowest spare part satisfaction rate P1, if PSIf the value is less than P1, making S equal to S +1, and jumping to step S2, otherwise, terminating the calculation and taking the current value of S as the final spare part demand;
and the output display module is used for outputting and displaying the final spare part demand calculated by the calculation module.
In a third aspect, the present invention provides a normal type general-purpose component requirement amount calculation apparatus, including:
a memory for storing a computer software program;
and the processor is used for reading and executing the computer software program stored in the memory, and realizing the method for calculating the requirement quantity of the normal universal part in the first aspect of the invention.
In a fourth aspect, the present invention provides a non-transitory computer-readable storage medium, wherein the storage medium stores a computer software program for implementing the method for calculating the demand for spare parts of a normal general-purpose component according to the first aspect of the present invention.
Drawings
Fig. 1 is a flowchart of a method for calculating a demand of normal general-purpose components according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating exemplary simulation results according to a first embodiment of the present invention;
fig. 3 is a structural diagram of a normal general component demand calculation apparatus according to a second embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
In the convention herein: a common part is used in N pieces of equipment (the array number is 1), the equipment can be different types or different specifications of the same type, and the working time T planned each year in each equipment is knowniAnd i is more than or equal to 1 and less than or equal to N, and when the universal part breaks down, the fault is eliminated by adopting a part changing and maintaining mode (the part changing and maintaining time is ignored). At present, a spare part warehouse needs to purchase spare parts of the general parts for one year, the number of the spare parts is recorded as S, and the spare part satisfaction rate of the spare parts is required to be not lower than P1.
Example one
As shown in fig. 1, an embodiment of the present invention provides a method for calculating a demand of a normal general-purpose component, including the following steps:
s1, initializing the spare part number S, and making S equal to 0;
S2，i＝1；
s3, calculating an array p1, wherein the array comprises S +1 elements,
order to
Wherein, TiI is more than or equal to 1 and less than or equal to N, wherein N is the total number of equipment using the universal part;
s4, if i is equal to 1, let p2 be p 1; otherwise, let p2 be p1 p2, where is the sign of convolution;
s5, let i equal to i +1, if i is less than or equal to N, go to step S3, otherwise let i equal to N
Then, jumping to step S6;
s6, judging PSWhether the requirement of spare part guarantee is met or not is judged, namely P is judgedSWhether it is less than the lowest spare part satisfaction rate P1, if PSIf P1 is less than the preset value, S is set to S +1, and the process goes to step S2, otherwise, the calculation is terminated and the current value of S is output as the final spare part demand.
Examples of the design
There is a common part in 4 different types of equipment, the life of which is subject to a normal distribution N (160, 70)2) The working time of this generic part in 4 installations per year amounts to 400, 600, 800, 1000 hours. The method is adopted to calculate the warehouse storage capacity of the universal spare parts for one year, so that the spare parts are fullThe foot rate is not less than 0.8.
Solution: 1) initializing the number of spare parts and making S equal to 0.
2) Calculating spare part satisfaction rate PS。
Table 1 lists the corresponding spare part satisfaction rates when the number of spare parts takes various values.
TABLE 1
3) When S is 17, the spare part satisfaction rate PSIs 0.8, and meets the spare part guarantee requirement that the spare part satisfaction rate is not less than 0.8.
4) The warehouse stock of the piece of generic spare parts for one year is 17 at the end of the calculation.
In this example, if the conventional method is adopted (the spare part demand of each equipment is calculated separately, and the sum of all the spare parts is taken as the final spare part demand), the spare part demands of 4 pieces of equipment are 3, 4, 5 and 7, and 19 spare parts are required in total.
FIG. 2 shows the result of the satisfaction rate of the spare parts obtained by the method and the simulation method of the present invention when the number of the spare parts of the above calculation examples is from 0 to 20. A large number of simulation results show that: the error of the two is within the range of engineering application.
Example two
As shown in fig. 3, the present invention provides a normal type general-purpose component demand amount calculation apparatus, including:
an input module for setting the equipment number N, the minimum spare part satisfaction rate P1 and the working time T planned by the general parts in each equipment every yeari，1≤i≤N；
The calculating module is used for calculating the demand of spare parts of the universal parts; the specific calculation method is as follows:
s1, initializing the spare part number S, and making S equal to 0;
S2，i＝1；
s3, calculating an array p1, wherein the array comprises S +1 elements,
order to
Wherein, TiThe working time of the universal piece planned in the ith equipment every year is represented, and i is more than or equal to 1 and less than or equal to N;
s4, if i is equal to 1, let p2 be p 1; otherwise, let p2 be p1 p2, where is the sign of convolution;
s5, let i equal to i +1, if i is less than or equal to N, go to step S3, otherwise let i equal to NThen, jumping to step S6;
s6, judging PSWhether the requirement of spare part guarantee is met or not is judged, namely P is judgedSWhether it is less than the lowest spare part satisfaction rate P1, if PSIf the value is less than P1, making S equal to S +1, and jumping to step S2, otherwise, terminating the calculation and taking the current value of S as the final spare part demand;
and the output display module is used for outputting and displaying the final spare part demand calculated by the calculation module.
EXAMPLE III
The embodiment of the invention provides a normal type general part spare part demand calculating device, which comprises:
a memory for storing a computer software program;
and the processor is used for reading and executing the computer software program stored in the memory, and realizing the method for calculating the requirement quantity of the normal universal part.
Example four
The embodiment of the invention provides a non-transitory computer readable storage medium, wherein a computer software program for realizing the normal type general-purpose part requirement calculation method is stored in the storage medium.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A normal type general part spare part demand calculation method is characterized by comprising the following steps:
s1, initializing the spare part number S, and making S equal to 0;
S2，i＝1；
s3, calculating an array p1, wherein the array comprises S +1 elements,
order to
Wherein, TiI is more than or equal to 1 and less than or equal to N, wherein N is the total number of equipment using the universal part;
s4, if i is equal to 1, let p2 be p 1; otherwise, let p2 be p1 p2, where is the sign of convolution;
s5, let i equal to i +1, if i is less than or equal to N, go to step S3, otherwise let i equal to N
Then, jumping to step S6;
s6, judging PSWhether the requirement of spare part guarantee is met or not is judged, namely P is judgedSWhether it is less than the lowest spare part satisfaction rate P1, if PSIf P1 is less than the preset value, S is set to S +1, and the process goes to step S2, otherwise, the calculation is terminated and the current value of S is output as the final spare part demand.
2. A normal type general-purpose spare part demand calculation device, comprising:
an input module for setting the equipment number N, the minimum spare part satisfaction rate P1 and the working time T planned by the general parts in each equipment every yeari，1≤i≤N；
The calculating module is used for calculating the demand of spare parts of the universal parts; the specific calculation method is as follows:
s1, initializing the spare part number S, and making S equal to 0;
S2，i＝1；
s3, calculating an array p1, wherein the array comprises S +1 elements,
order to
Wherein, TiThe working time of the universal piece planned in the ith equipment every year is represented, and i is more than or equal to 1 and less than or equal to N;
s4, if i is equal to 1, let p2 be p 1; otherwise, let p2 be p1 p2, where is the sign of convolution;
s5, let i equal to i +1, if i is less than or equal to N, go to step S3, otherwise let i equal to N
Then, jumping to step S6;
s6, judging PSWhether the requirement of spare part guarantee is met or not is judged, namely P is judgedSWhether it is less than the lowest spare part satisfaction rate P1, if PSIf the value is less than P1, making S equal to S +1, and jumping to step S2, otherwise, terminating the calculation and taking the current value of S as the final spare part demand;
and the output display module is used for outputting and displaying the final spare part demand calculated by the calculation module.
3. A normal type general-purpose spare part demand calculation device, comprising:
a memory for storing a computer software program;
a processor for reading and executing the computer software program stored in the memory to realize the method for calculating the requirement of the normal universal component as claimed in claim 1.
4. A non-transitory computer-readable storage medium, wherein a computer software program for implementing the normal type general-purpose spare part demand calculation method according to claim 1 is stored in the storage medium.
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