## 1 Introduction  
The purpose of this paper is to describe the method for simulating the noise of construction machinery, as it should be performed by the contractor to protect people around the construction from noise while maintaining the highest possible involvement of construction machinery during construction. In the case of excessive noise pollution, the selected machines, technical processes, or time of deployment of machines can be adjusted in the construction plan. Effective measures can be proposed in time for beneficial results to be achieved. The correct evaluation of construction noise and the abovementioned adjustments can help in optimising the planned building project and bringing the construction plan closer to its real implementation. The construction plan prepared by the building contractor is based on the options available at the construction site and the volume of materials that must be brought to the site and then incorporated into the structures to be built there via appropriate technical procedures. The optimisation of such plans is conducted as an analysis of conflicting goals. Many contributions exist in the literature on the topic of optimisation performed to lower the cost of work, including the optimisation of construction site operation. Detailed procedures for the preparation and management of construction projects are described by a team of authors in the publication Priprava a realizace staveb (Preparation and execution of construction) [1] and many other studies [2; 3; 4]. A proposal concerning construction site operations is provided by the contractor as part of their production and pre-production preparations for the construction project. The cost of the construction site equipment needed for standard structures should lie in the range of 2-5% of the total construction costs, as stated in Chapter 6 (Motycka, V). Ref. [1] The costs of setting up a construction site also include the costs of necessary but unexpected measures taken during construction, which may include (for example) the installation of a noise barrier. Heavy construction machines, especially lifting devices, have a decisive influence on the layout of a construction site and the sequence of the technical processes occurring there. The deployment of construction machinery is often analysed in a complex fashion and optimised, as it is the most expensive equipment at the construction site and the way it is used and combined has a major impact on the smoothness of the construction process. Various simulation models and optimisation methods are employed to achieve the effective use of machinery [3; 4; 5]. Today, ever more consideration is being given to ecological aspects during construction: Attention is paid to waste sorting, the washing of vehicle wheels before public roads are used and the reduction of dust and noise on building sites. During construction, the majority of noise is caused by machinery. Noise emanating from the site is added to noise from the operation of roads, railways and factories that already exist in the environment. With regard to the ever-increasing intensity of noise emitted all around us, as well as the results of medical research, this issue has started to be monitored and limits have been defined for undesired sounds (noise) in relation to \"indoor protected areas\" (i.e., areas inside buildings), outdoor protected areas and the workplace. Efforts are being made to eliminate the adverse effects of noise on the human organism [2; 6; 7; 8]. Excessive noise can temporarily break the nerve connections between the hair cells in the inner ear and the auditory nerve, causing hearing loss. This phenomenon is called \"temporary hearing threshold shift\" and will slowly disappear once the noise exposure is over. The re-generation of hearing can then take several hours to several days. It has been found that the shift of the hearing threshold starts already at noise levels exceeding 80 dB. The pain threshold in humans occurs at about 120-130 dB.