Abstract
This paper develops a multiproduct economic production quantity inventory model for a vendor–buyer system in which several products are manufactured on a single machine. The vendor delivers the products to customer in small batches. The number of orders must be a discrete value. Moreover, benefitting from a just-in-time policy, the buyer decides the size of the delivered batches. Due to the fact that several products are manufactured on one machine, this makes that the production capacity be considered as a constraint. The aim of this study is to determine the optimal cycle length and the number of delivered batches for each product so that the total inventory cost is minimized. The problem under study is modeled as a mixed integer nonlinear programing problem considering maximum number of orders, capacity and budget constraints. Three different methods are developed and employed to solve this problem: an exact method, a heuristic algorithm and a hybrid genetic algorithm. Based on the results, the three algorithms have near efficiency with different running times. The results shows that the heuristic algorithm obtains a good solution in a short time and the hybrid genetic algorithm finds solutions with higher quality in an acceptable time. Finally, a sensitivity analysis is done to evaluate the effect of changes in the parameters of problem.
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Acknowledgements
The third author was partially supported by the Tecnológico de Monterrey Research Group in Industrial Engineering and Numerical Methods 0822B01006.
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Appendices
Appendix A: Coefficients of the objective function in Eq. (21)
Appendix B: Hessian matrix to prove the convexity of the objective function (TC)
Therefore
Appendix C: Finding the optimal solution for the cycle length
Based on Eq. (C.1),
Appendix D: Finding the \(K_i \) ‘s solution
With respect to Cárdenas-Barrón et al. (2014a, b) the objective function related to \(K_i \) can be rewritten as follows:
García-Laguna et al. (2010) showed that discrete solution to the following minimization problem:
is as follows:
where \(\lceil {r}\rceil \) is the samllest integer greater than or equal to r, and \(\lfloor {r}\rfloor \) is the largest integer less than or equal to r . Based on Eq. (D.1), the solution for each discrete variable (\(K_i \)) is as follows:
Appendix E: Data of the problems
Instance | Values |
---|---|
1 | \(\hbox {n}=1\); \(\hbox {A}=55\); \(\hbox {Av}=601\); \(\hbox {D}=3050\); \(\hbox {M}=12\); \(\hbox {P}=34021\); \(\hbox {S}=0.031254215825\); \(\hbox {b}=17\); \(\hbox {c}=32\); \(\hbox {h}=11\); \(\hbox {hv}=7\); \(\hbox {Bg}=210564\); |
2 | \(\hbox {n}=2\); \(\hbox {A}=[57;54; \)]; \(\hbox {Av}= [605;506; \)]; \(\hbox {D}=[3304;3585; \)]; \(\hbox {M}= [20;13; \)]; \(\hbox {P}=[34184;33209; \)]; \(\hbox {S}= [0.0105049440381213;0.0107826303120975; \)]; \(\hbox {b}= [18;19; \)]; \(\hbox {c}=[50;42\); \(\hbox {h}=[14;15;]\); \(\hbox {hv}=[7;9; \)]; \(\hbox {Bg}=200000\); |
3 | \(\hbox {n}=3\); \(\hbox {A}=[60;41;48; \)]; \(\hbox {Av}=[588;573;652; \)]; \(\hbox {D}=[3034;3106;3230; \)]; \(\hbox {M}=[16;19;15; \)]; \(\hbox {P}=[35078;35196;31741; \)]; \(\hbox {S}\)=[0.0223815747373719; 0.0431007305419610; 0.0256422317325111; ]; \(\hbox {b}=[20;19;19; \)]; \(\hbox {c}=[57;34;54; \)]; \(\hbox {h}=[14;12;13; \)]; \(\hbox {hv}=[8;6;6; \)]; \(\hbox {Bg}=220000; \) |
4 | \(\hbox {n}=4\); \(\hbox {P}=[20000;25000;30000;35000\)]; \(\hbox {D}=[3000;4000;5000;6000\)]; \(\hbox {A}=[50;49;48;47]\); \(\hbox {Av}=[300;350;400;450\)]; \(\hbox {b}=[15;16;17;18\)]; \(\hbox {c}=[60;50;40;30\)]; \(\hbox {h}=[10;11;12;13\)]; \(\hbox {hv}=[5;6;7;8\)]; \(\hbox {S}=[0.010;0.011;0.012;0.013\)]; \(\hbox {M}=[10;11;12;13\)]; \(\hbox {Bg}=200000\); |
5 | \(\hbox {n}=5\); \(\hbox {A}=[48;57;42;57;54; \)]; \(\hbox {Av}=[621;633;638;605;506; \)]; \(\hbox {D}=[3490;3392;3304;3585;3810; \)]; \(\hbox {M}=[25;23;12;20;27; \)]; \(\hbox {P}=[37432;38886;34178;34184;33209; \)]; \(\hbox {S}=[0.0123850047313383\); 0.0104662927574031; 0.0105868898071024; 0.0105049440381213; 0.0107826303120975; ]; \(\hbox {b}=[18;19;17;17;20; \)]; \(\hbox {c}=[60;35;50;35;42; \)]; \(\hbox {h}=[14;15;14;11;12; \)]; \(\hbox {hv}=[6;9;9;7;9; \)]; \(\hbox {Bg}=300000\); |
6 | \(\hbox {n}=6\); \(\hbox {A}=[56;41;49;54;59;58; \)]; \(\hbox {Av}=[599;564;606;531;679;517; \)]; \(\hbox {D}=[3698;3283;3768;3729;3745;3992; \)]; \(\hbox {M}=[14;12;14;16;14;15; \)]; \(\hbox {P}=[44292;45707;48886;48170;46883;46293; \)]; \(\hbox {S}=[0.0102325506160998\); 0.0126011032672879; 0.0142823788966337; 0.0105199928051386; 0.0132451259154651; 0.0121322355691141;]; \(\hbox {b}=[16;19;19;17;20;19; \)]; \(\hbox {c}=[47;56;36;51;56;56; \)]; \(\hbox {h}=[13;11;14;15;13;15; \)]; \(\hbox {hv}=[9;8;9;9;9;7; \)]; \(\hbox {Bg}=340000\); |
Instance | Values |
---|---|
7 | \(\hbox {n}=7\); \(\hbox {A}=[43;60;57;46;56;54;51\)]; \(\hbox {Av}=[683;598;687;510;660;533;640\)]; \(\hbox {b}=[19;20;19;16;16;16;20\)]; \(\hbox {c}=[33;35;53;55;45;45;59]\); \(\hbox {D}=[3906;3971;3036;3032;3382;3680;3256]\); \(\hbox {h}=[12;13;14;14;13;15;13]\); \(\hbox {hv}=[8;10;7;7;9;7;6\)]; \(\hbox {M}=[28;28;14;11;24;15;15]\); \(\hbox {P}=[58148;51577;56558;57061;54388;52761;57513]\); \(\hbox {S}=[0.00678753417717149\); 0.00596103664779777; 0.00527738945088778; 0.00675111024419178; 0.00554682415429036; 0.00492633875489889; 0.00274647002779529]; \(\hbox {Bg}=600000\); |
8 | \(\hbox {n}=8\); \(\hbox {A}=[44;51;49;47;59;46;50;60; \)]; \(\hbox {Av}=[543;644;688;567;607;628;556;655; \)]; \(\hbox {D}=[3881;3283;3048;3665;3762;3428;3173;3445; \)]; \(\hbox {M}=[21;11;13;16;20;14;15;17; \)]; \(\hbox {P}=[55155;52790;50621;50841;55832;50598;59402;59772; \)]; \(\hbox {S}=[0.00558092416972521;0.00545914149027077\); 0.00426036592499336; 0.00571323607021602; 0.00477255987896942; 0.00596349952839672; 0.00407898304411736; 0.00537758276671398;]; \(\hbox {b}=[16;16;18;16;16;20;20;16;]\); \(\hbox {c}=[42;46;41;35;57;47;56;39; \)]; \(\hbox {h}=[15;12;15;13;15;13;12;13; \)]; \(\hbox {hv}=[9;6;10;7;7;10;9;9; \)]; \(\hbox {Bg}=500000\); |
9 | \(\hbox {n}=9\); \(\hbox {A}=[57;52;51;47;45;41;44;48;59\)]; \(\hbox {Av}=[549;610;656;606;683;655;553;603;689\)]; \(\hbox {b}=[20;20;20;16;16;20;16;18;18\)]; \(\hbox {c}=[41;39;34;49;55;57;35;33;45\)]; \(\hbox {D}=[3255;3831;3054;3795;3084;3962;3911;3623;3050\)]; \(\hbox {h}=[11;14;13;12;13;11;15;12;12\)]; \(\hbox {hv}=[7;9;8;9;10;7;8;6;10\)]; \(\hbox {M}=[19;21;17;24;18;25;13;15;13\)]; \(\hbox {P}=[58408;53517;50759;51622;54506;51067;54315;58531;54173\)]; \(\hbox {S}=[0.00508022338073320;0.00390222923487678\); 0.00205951034750621; 0.00544607251570004; 0.00239087764376592; 0.00329935201425327; 0.00474930100918166; 0.00291953894141208; 0.00384623390560108]; \(\hbox {Bg}=3500000\); |
10 | \(\hbox {n}=10\); \(\hbox {A}=[42;56;52;55;54;56;55;54;43;50; \)]; \(\hbox {Av}=[686;604;507;553;639;580;599;656;571;553; \)]; \(\hbox {D}=[3100;3667;3128;3405;3912;3679;3990;3447;3208;3758; \)]; \(\hbox {M}=[16;19;20;19;21;13;16;19;14;15; \)]; \(\hbox {P}=[59821;54299;550821;59572;42408;59514;50261;55099;58458;58049; \)]; \(\hbox {S}=[0.0112106973483762;0.0123850047313383\); 0.0104662927574031; 0.0105868898071024; 0.0105049440381213; 0.0107826303120975; 0.0146195488032070; 0.0127347829716488; 0.0122802530908873; 0.0147300508601312; ]; \(\hbox {b}=[20;17;20;19;16;16;18;18;20;19; \)]; \(\hbox {c}=[32;37;49;46;34;48;56;46;42;39; \)]; \(\hbox {h}=[13;14;14;12;15;13;12;12;11;13; \)]; \(\hbox {hv}=[6;8;10;6;9;9;8;9;7;7; \)]; \(\hbox {Bg}=600000; \) |
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Nobil, A.H., Sedigh, A.H.A. & Cárdenas-Barrón, L.E. A multiproduct single machine economic production quantity (EPQ) inventory model with discrete delivery order, joint production policy and budget constraints. Ann Oper Res 286, 265–301 (2020). https://doi.org/10.1007/s10479-017-2650-9
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DOI: https://doi.org/10.1007/s10479-017-2650-9