The working conditions of bus drivers are difficult; they lead to occupational diseases and require careful study, particularly in Ukraine. The objective of the article is the description of occupational health risks of passenger bus drivers that lead to deteriorating health. The risk assessment was performed using a modified Risk Score method, which allowed determining the generalized level of danger to the driver's health. The hygienic hazards level was assessed as based on Stevenson's law, which was generalized later. Based on the modification of the Risk Score method, it was possible to depart from expert assessments method of the risk level and calculate the general indicator based on the degree of dependence of the impact on the human body on its intensity, proposed by V. Minko. This allows objective determining of the impact of hygiene hazards on the health of the driver and to predict the occurrence of occupational diseases associated with the cardiovascular system, musculoskeletal system, and partial or complete disability due to the accumulation of emotional fatigue. The hazard assessment was carried out for three brands of passenger buses common in Ukraine, in which the driver is exposed to the dangers of fever, vibration, noise, harmful impurities in the bus cabin, and emotional load. The health of drivers in the cabins of passenger buses is most affected by hygiene hazards: fever, vibration, and emotional stress. The generalized level of risk is calculated by the modified method of Risk Score is 0.83; −0.99, −0.92 respectively.

Purpose.The aim of the study is to develop recommendations for reducing the probability of accidents during the transportation of rock by dump trucks based on the analysis of the consequences of changes in the psycho-physiological states of the driver. Methods. The study used the method of “Hazard and operability studies” and the method of “Failure Mode and Effects Analysis” including the organizational, logical and mathematical, and statistical procedures aimed at obtaining the expert assessment of hazards from professional experts based on Grabs’ criteria that affect to change the psychophysiological state of the driver while driving a dump truck, their analysis and generalization of the results in order to prepare reasonable decisions. Findings. It is established that the psychophysiological state of the driver as a manifestation of fear, anxiety, doubt, uncertainty when performing discrete work, which is associated with frequent changes in the beginning of movement and stops of the vehicle (accumulation of a large number of dump trucks, complex route plan, etc.) leads to an increase in the risk of an emergency. It is determined that the highest level of emergency occurs due to emotional manifestations, that are associated with the relationship between employees, the presence of leadership support, psychological assistance, mobbing, conflict resolution and more. Recommendations have been developed to increase the level of transportation safety through the formation of an appropriate organizational culture at the enterprise, which ultimately shapes human social behaviour. Originality. The scientific novelty lies in the establishment of the values of occupational risk of an accident while driving a dump truck by the driver, which depends not only on the probability of a dangerous event and the severity of its consequences, but also on changes in the psychophysiological state of the driver, which results from the organizational culture of occupational safety at the mining enterprise. Practical implications. Consists in the development of a procedure for qualitative assessment of the risk of an accident from the psychophysiological state of the driver during the trucking of rock in the conditions of the mining enterprise. Recommendations for improving the safety of transportation through the formation of an appropriate organizational culture of the transport process are developed. An approach of taking into account the socio-psychological climate in the organization to assess the occurrence of the incident is proposed.

Purpose. To improve the approach to the development of a safe work system, one of the important elements of the occupational health and safety management system (OHSMS) of employees at an enterprise. Methodology. The research is based on the Safe Systems of Work, which combines the content of safe procedures, which are determined taking into account the content of the workers production task when performing production activities, his/her competence in understanding the technological process and characteristics involved technological equipment. Findings. To reduce occupational diseases and industrial injuries at enterprises, it is proposed to implement the Safe Systems of Work (SSW) of 5 steps: analyse, summarize, anticipate, support, improve, which will make it possible to identify occupational risks (OR) and justify the feasibility of reducing their impact on the worker during the performance of production activities. For the implementation of each step, a corresponding procedure is provided, which allows ensuring their implementation. It is proposed to carry out the OR evaluation procedure according to the Tree Trunk Analysis model, which is a section of the trunk of a tree divided into six parts which characterize the dangerous factors that affect the activity of the employee, the functioning of the technological equipment and the environment. A feature of the proposed approach is the establishment of zones of interaction between the following components of the proposed SSW: the worker and technological equipment, the worker and the environment, as well as the environment and technological equipment, which characterize the specified external and internal factors of influence on the SSW. Originality. The approach to the organization of SSW to reduce the level of OR during the performance of production activities has been improved based on the improvement of the OR management process, the identification of external and internal dangerous factors that affect the level of OR, the probability of the occurrence of a dangerous event and its degree of severity, taking into account changes, over time, in the conditions of performing professional activities: during stable work, during an emergency situation, during an accident and during martial law. Practical value. Improved labour protection instructions or maps of safe production processes can be applied at enterprises with the aim of better perception by employees of labour safety requirements and improvement of document flow at the workplace.

In this paper, a solution to the problem of the change in the pressure drop in a respirator filter during cyclic air motion is suggested since the current theory of filtering is based on steady-flow processes. The theoretical dependence of the pressure drop in the respirator filter on air flow rate is determined, which is represented by the harmonic law, which characterizes the human respiration process during physical work. For the calculation, a filter model was used, which is represented by a system of parallel isolated cylinders with a length equal to the total length of the filter fibres surrounded by porous shells formed by a viscous air flow field, with a size determined by the equal velocities of the radial component of air flow and undisturbed flows. The flow-around process in the proposed model of air flow through the respirator filter is described by the Brinkman equation, which served to establish the total air flow resistance in the proposed system under conditions of velocity proportionality. It consists of two parts: the first characterizes the frictional resistance of the air flow against the surface of the cylinder, which imitates the filter fibre; the second—the inertial part—characterizes the frequency of pulsations of respiratory movements during physical performance. The divergence of the analytical results and experimental studies is no more than 20%, which allows the use of the established dependence to estimate the change in pressure drop in a respirator filter made of filter material “Elephlen” when the user carries out different physical activities. This allows the period of effective protective action of respirators with different cycles of respiration during physical activities to be specified, which is a very serious problem that is not currently regulated in health and safety regulations, and it also allows the prediction of the protective action of filters and respiratory protection in general.

Safety of passenger road transportation (PRT) is a global problem considered by scientists. The present study is aimed at PRT safety improvement by developing its advanced model with accident risk minimization. Functional Resonance Analysis Method is used to identify factors influencing PRT safety. Accident risk assessment of the combined action of several factors in PRT is based on a phenomenological model. Possible good and bad PRT scenarios were considered differing in the staff professional experience, work shift duration, speed, vehicle service lifetime, and driver's stress load. Method for quantitative assessment of five main functions in PRT with their variability caused by parameters changes was designed. The proposed criteria were used to assess the parameter's deviations from their normative values and determine the major characteristics of each function. The recommendations for monitoring the driver's psychophysiological state at all transportation stages were developed and the relationship of transportation functions characteristics and criteria affecting passenger safety was established. This methodology enables assessing the PRT reliability level at a certain time. The approach allows evaluating the criteria affecting traffic safety, identifying their potential functionally resonant effect for abnormal PRT due to conditional changes; developing mechanisms to reduce accident risks by improving technical and organizational management.

Introduction: The social and economic situation in modern world requires new approaches to the development of respiratory protective equipment. Objective: Improve the process of 3D modeling of respirator half-masks and encapsulated particle filters to them. Methods: The basic provisions of the theory of non-stationary filtration and hydroaerodynamics; the Nelder-Mead method; the linear interpolation equation. Results: The peculiarity of the algorithm is the adjustment stage of the design process aimed at efficiency check for half-mask. The surface of the half mask was constructed according to the coordinates of the 3D model of a worker's head. Conclusion: For the first time the regularities of algorithm for design of the half-mask surface of dust respirators were defined based on the data of three-dimensional coordinates of key points of anthropometric parameters of the workers' faces. The pressure difference on the encapsulated particle filters of dust respirators is determined by the particle filter’s resistance coefficient and the air flow through them, the diameters ratio of their outlets and inlets. Relevance to industry: The algorithm developed provides the product verification at the design stage using criteria evaluation of the parameters of the polygonal model of the head; preliminary calculation of the protection factor; checking the tightness of the prototype.