Uncertainties in the external environment affect the normal execution of production planning and production scheduling

In the process of production and operation of enterprises, the external factors such as market competition and the various uncertainties caused by the internal factors decided by the enterprise's production characteristics often lead to the established scheduling scheme not to be carried out according to the predetermined target. Therefore, in order to improve the flexibility of production and better reflect the actual situation of production, improve the production efficiency of enterprises, research enterprise production and management of uncertainty factors are very important significance.

According to its different sources, the uncertainty of business operation and production process can be divided into the following four categories:

1. The inherent uncertainty of the system. This kind of uncertainty parameter mainly includes various dynamics, thermodynamic constants, heat transfer and mass transfer coefficients. The chemical, physical and thermodynamic constants of various industrial production processes are quite different from the laboratory data, and they are very difficult to obtain, and are usually obtained from the analysis of experimental and factory actual records. These uncertainties often affect the control level of the production process and the control performance index.

2, the production process of uncertainty. This kind of uncertainty mainly includes the flow velocity, temperature, pressure change and equipment processing ability of various fluid medium in the production process. such as in the intermittent production process, each production process of various logistics processing time, a certain equipment production capacity, intermediate product stability storage time. Such uncertainties often affect the performance of production scheduling systems.

3. The uncertainty of the external environment. Under the condition of market economy system, Enterprise's production is no longer an independent behavior, but is affected by the external environment, the demand of product, price, the supply of energy and raw materials and other external environmental factors constitute the uncertain factors. Such uncertainties often affect the normal execution of production planning and production scheduling schemes.

4. Discrete uncertainties. The failure of equipment, machine, instrument failure, manual misoperation, or the shortage of key operators will cause great difficulties to the normal production of enterprise organization.

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