CN113283831B - Safety stock control method based on periodic checking stock replenishment strategy - Google Patents
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Abstract
The invention discloses a safety inventory control method based on a periodic checking inventory replenishment strategy. The method for replenishing the electric power secondary bin and the first-aid kit is researched by periodically checking an inventory replenishment strategy, the replenishment period of the electric power secondary bin and the replenishment period of the first-aid kit are compared, three conditions that the replenishment period of the secondary bin is smaller than the replenishment period of the first-aid kit, the replenishment period of the secondary bin is consistent with the replenishment period of the first-aid kit, and the replenishment period of the secondary bin is larger than the replenishment period of the first-aid kit are met, safety inventory values of the secondary bin are calculated respectively according to the three conditions, and finally the safety inventory control method of the secondary bin is obtained through comparison, and meanwhile, the safety inventory calculation formula of the emergency kit according to the replenishment requirement of the first-aid kit is obtained. And combining different relations between the secondary bin and the first-aid kit replenishment period to obtain a safe inventory control method suitable for the secondary bin and the first-aid kit, which is beneficial to reducing the warehouse material management cost and keeping the warehouse inventory in a healthy and efficient state at any time.
Description
Technical Field
The invention relates to the field of power material reserve optimization, in particular to a safety inventory control method based on a periodic checking inventory replenishment strategy.
Background
In recent years, strengthening inventory management has become a key measure for enterprises to reduce operation cost, prevent mobile assets from stagnating and being put aside, improve reasonable allocation capability of enterprise resources and strengthen market competitiveness of enterprises, and factors such as a replenishment mode, an order cycle, a logistics mode and the like related to maintaining reasonable inventory and effective control are core contents of material reserve management, but maintaining a proper inventory quantity so that inventory is kept in a good state which is not oversaturated and is not in shortage when not in use is a problem to be solved first for researching reserve management. In the current industry, management and control of warehouse replenishment mainly comprises manual experience replenishment, moving average quantity replenishment, ERP inventory water level method and the like, and the replenishment methods have a plurality of limitations, are not suitable for general use in various industries and businesses, have larger errors and have lower functions and emergency capability.
Disclosure of Invention
In order to solve the defects and the shortcomings of the prior art, the inventor provides a new safety stock control method through research and development, solves the problems of the traditional and scientific degree of the electric power material stock management mode, and particularly, the invention is realized in such a way that:
a safety inventory control method based on a periodic inspection inventory restocking strategy, comprising the steps of: the method comprises the steps of obtaining information L1 and L2 of a second bin replenishment period and a first-aid kit replenishment period, comparing the information L1 and L2 with each other, calculating the safe stock quantity of the second bin under different comparison results, adjusting the safe stock quantity of the second bin, adjusting the replenishment period of the second bin and the replenishment period of the first-aid kit, verifying the safe stock condition of the second bin through the different replenishment periods of the second bin and the first-aid kit, obtaining a second bin safe stock calculation formula, ensuring that the second bin can meet the minimum safe stock and the replenishment requirement of the first-aid kit based on the second bin safe stock calculation formula, and keeping the safe stock of the second bin to be minimum due to the fact that the two bins are staggered with the replenishment time points of the first-aid kit and the replenishment period is the same.
Namely: when the second-level warehouse replenishment cycle is smaller than the first-aid kit replenishment cycle, calculating the second-level warehouse safety stock; when the second-level warehouse replenishment cycle is consistent with the first-aid kit replenishment cycle, calculating the second-level warehouse safety stock; and when the second-level warehouse replenishment period is greater than the first-aid kit replenishment period, calculating the second-level warehouse safety stock.
The two-stage bin and the first-aid kit are obtained through three methods, the replenishment period is the same (but the replenishment time points are staggered), so that the safety stock is kept to be the lowest, and the first-aid kit requirement can be met.
Further, the inventory consumption condition when the second-level bin replenishment period is smaller than the first-aid kit replenishment period is simulated, and a calculation formula at least to be met by the second-level bin safety inventory is obtained.
Further, the inventory consumption condition when the two-level bin replenishment period is consistent with the first-aid kit replenishment period is simulated, and a calculation formula at least to be met by the two-level bin safety inventory is obtained.
Further, the inventory consumption condition when the second-level bin replenishment period is larger than the first-aid kit replenishment period is simulated, and a calculation formula at least to be met by the second-level bin safety inventory is obtained.
Furthermore, the safety stock can be kept to be the lowest after verifying that the two-stage bin and the first-aid kit have the same replenishment period, and the first-aid kit requirement can be met.
Furthermore, the number of the first-aid kit safety stock is only required to be up to the condition that no cargo source is absent, and a first-aid kit safety stock calculation formula is obtained.
Furthermore, if the secondary bin does not supplement the first-aid kit, the first-aid kit safety inventory calculation formula can be calculated.
The working principle of the invention is introduced: the safety stock conditions of the secondary bin are verified through different replenishment periods of the secondary bin and the first-aid kit, a secondary bin safety stock calculation formula is obtained, the secondary bin is guaranteed to meet the minimum safety stock and the replenishment requirement of the first-aid kit, the phenomena of bin pressing and shortage of the secondary bin are avoided, and warehouse management cost is reduced.
The beneficial effects of the invention are as follows: and combining different relations between the secondary bin and the first-aid kit replenishment period to obtain a safe inventory control method suitable for the secondary bin and the first-aid kit, which is beneficial to reducing the warehouse material management cost and keeping the warehouse inventory in a healthy and efficient state at any time.
Drawings
FIG. 1 is a simulation of inventory consumption when the two-level bin replenishment period is less than the first-aid kit replenishment period.
FIG. 2 is a simulation of inventory consumption when the two-level bin replenishment period is equal to the first-aid kit replenishment period. FIG. 3 is a simulation of inventory consumption when the two-level bin replenishment period is less than the first-aid kit replenishment period, wherein the ordinate 0 represents the lowest inventory safety line.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Example 1:
the invention is described in further detail below in connection with fig. 1, 2 and 3:
(1) Two-level bin safety inventory calculation
As shown in fig. 1, the two-level bin replenishment cycle is less than the first-aid kit replenishment cycle: l (L) 1 ＜L 2 。
For L 1 ＜L 2 In a period T (least common multiple of L1 and L2), the replenishment times of the secondary bin are more than those of the first-aid kitIf the secondary bin is required to be ensured to meet the requirement of the first-aid kit (all the first-aid kits for which the secondary bin is responsible), when the replenishment period of the secondary bin is smaller than that of the first-aid kit, the replenishment times of the secondary bin in one period T are larger than those of the first-aid kit, and the safety stock of the secondary bin only needs to meet the requirementThe demand of all first-aid kits in the range is enough, and in this way, the secondary bin can meet the demand of the first-aid kits, and meanwhile, higher inventory is maintained, so that the management cost of the warehouse is increased. The secondary bin safety stock at least meets the formula (1-1):
n is a natural number, and
wherein: ss is the safety stock of the secondary bin;the average demand of the secondary bin in unit time is calculated; delta L is the number of days in the interval between the two-stage bin and the first-aid kit replenishment period; />Is the average of the demand of the first-aid kit i per unit time.
As shown in fig. 2, the two-level bin replenishment cycle is consistent with the first-aid kit: l (L) 1 ＝L 2 。
For a period T (L 1 ，L 2 Least common multiple of (a) and the replenishment times of the secondary bin are more than those of the first-aid kitIf the secondary bin is required to ensure that the secondary bin can meet the requirement of the first-aid kit (all the first-aid kits for which the secondary bin is responsible), when the secondary bin replenishment period is equal to the first-aid kit replenishment period, the secondary bin replenishment time is staggered with the first-aid kit replenishment time, and the secondary bin replenishment time is required to be earlier than the first-aid kit, the replenishment times of the secondary bin in one period T are greater than the first-aid kit replenishment times, and at the moment, the safety stock of the secondary bin is required to meet the requirement of the first-aid kit for which the secondary bin is responsible in the interval days of the secondary bin and the first-aid kit replenishment period, so that the secondary bin can keep the minimum safety stock and simultaneously meet the requirement of the first-aid kitThe need for first aid kits. The secondary bin safety stock at least meets the following formula (1-2):
wherein: ss is the safety stock of the secondary bin;the average demand of the secondary bin in unit time is calculated; Δl is the number of days between the two-stage bin and the first-aid kit replenishment cycle.
As shown in fig. 3, the secondary bin replenishment cycle is greater than the first-aid kit replenishment cycle: l1 > L2.
For L 1 ＞L 2 Within one period T (L 1 ，L 2 The least common multiple of (a) and the number of replenishment times of the secondary bin is less than the number of replenishment times of the first-aid kit, as shown in fig. 3, the secondary bin is at a low stock level and is required to replenish the first-aid kit, and serious backdrop occurs in the secondary bin, and if the secondary bin is required to be ensured to meet the requirement of the first-aid kit, the safety stock of the secondary bin must be established at a higher stock level.
To sum up: the two-stage bin and the first-aid kit have the same replenishment period (but staggered replenishment time points), so that the safety stock can be kept to be the lowest, and the first-aid kit requirement can be met.
And finally selecting a calculation formula of consistency of the replenishment period of the secondary bin and the first-aid kit as a calculation method of the safety inventory of the secondary bin according to the verification of the three conditions, thereby achieving the purposes that the secondary bin keeps the lowest safety inventory and meets the first-aid kit requirement.
Thus: the safety stock of the secondary bin can be calculated using the following formula (1-3):
wherein: ss is the safety stock of the secondary bin;the average demand of the secondary bin in unit time is calculated; delta L is the number of days in the interval between the two-stage bin and the first-aid kit replenishment period; />Is the average of the demand of the first-aid kit i per unit time.
Note that: if the secondary bin does not restock the first-aid kit, the secondary bin corresponds to a large first-aid kit, and the quota calculation can refer to the first-aid kit.
(2) First-aid kit safety stock calculation
Because the resources which can be stored by the first-aid kit are very small in variety and quantity, the calculation by using the statistical related knowledge is relatively difficult, and the supplementary sources of the first-aid kit are basically two-level warehouses, and the intervals are not very long, so that the quantity of the safety stock can be calculated by the calculation formula of other requirement rules only by the condition that the shortage of the sources does not occur:
the number of the first-aid kit safety stock is only required to be up to the condition that no cargo source is absent, so that the first-aid kit safety stock of the first-aid kit can be obtained by multiplying the first-aid kit demand quantity per unit time by the difference value (safety days) of days before and after the first-aid kit is replenished.
The safety stock calculation formula is therefore (1-4):
wherein:average demand for first-aid kits per unit time; l (L) Anan (safety) The first-aid kit is the safety days.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (2)
1. A safety stock control method based on a periodic checking stock restocking strategy, comprising the steps of: acquiring information L1 and L2 of a second bin replenishment period and a first-aid kit replenishment period, comparing the information with each other, calculating the safe stock quantity of the second bin under different comparison results, adjusting the safe stock quantity of the second bin, adjusting the replenishment period of the second bin and the first-aid kit replenishment period, verifying the safe stock condition of the second bin through the different replenishment periods of the second bin and the first-aid kit, obtaining a second bin safe stock calculation formula, ensuring that the second bin can meet the minimum safe stock and the replenishment requirement of the first-aid kit based on the second bin safe stock calculation formula, and keeping the safe stock of the second bin to be the minimum by staggering the replenishment time points of the second bin and the first-aid kit and the replenishment period to be the same; the mutual comparison comprises: when the second-level bin replenishment period is smaller than the first-aid kit replenishment period; when the two-stage bin replenishment period is consistent with the first-aid kit replenishment period; when the second-level bin replenishment period is greater than the first-aid kit replenishment period;
when the second-level warehouse replenishment cycle is smaller than the first-aid kit replenishment cycle, the second-level warehouse safety stock adjustment comprises the following steps: within a period T, period T is L 1 ，L 2 The number of replenishment times of the secondary bin is more than the number of replenishment times of the first-aid kit, and the secondary bin safety stock at least meets the following formula:
wherein n is a natural number, andss is the safety stock of the secondary bin; />The average demand of the secondary bin in unit time is calculated; delta L is the number of days in the interval between the two-stage bin and the first-aid kit replenishment period; />An average value of the demand of the first-aid kit i per unit time;
when the two-stage bin replenishment period is consistent with that of the first-aid kit, the period T is L in one period T 1 ，L 2 The number of replenishment times of the secondary bin is more than the number of replenishment times of the first-aid kit, and the secondary bin safety stock at least meets the following formula:
wherein: ss is the safety stock of the secondary bin;the average demand of the secondary bin in unit time is calculated; delta L is the number of days in the interval between the two-stage bin and the first-aid kit replenishment period;
when the replenishment period of the secondary bin is greater than that of the first-aid kit, the period T is L in one period T 1 ，L 2 The second-level bin and the first-aid kit have the same replenishment period, but the replenishment time points are staggered, so that the safety stock can be kept to be the lowest, and the first-aid kit requirement can be met;
thus: the safety stock of the secondary bin should satisfy:
wherein: ss is the safety stock of the secondary bin;is of unit time twoAverage demand of the stage bin; delta L is the number of days in the interval between the two-stage bin and the first-aid kit replenishment period; />Is the average of the demand of the first-aid kit i per unit time.
2. The safety stock control method according to claim 1, wherein the safety stock quantity of the first-aid kit satisfies:
wherein:average demand for first-aid kits per unit time; l (L) Anan (safety) The first-aid kit is the safety days.
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