Airflow and heat stress in a metallurgical industrial building under different working conditions

In this paper, a model of an engine case is designed in Pro/Engineer for fatigue simulation. The meshing is created by the way of Abaqus. According to the working conditions, the boundary restriction of the simulation is defined. By the simulation, the heat distribution of the engine case is given, the causes of relatively high temperature areas are discussed, and the heat-stress distribution is drawn too. The high stress area in the engine case is discovered. The simulation result shows that the steady working stress is about 60MPa, the transient stress is between 90MPa to 120MPa, and the maximal stress is 136MPa. Based on the heat stress the fatigue life of the engine case is analyzed. The research result is a reference of the engine case safe working.

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Occupational Hot Exposures: Body Physiology and An Approach to Numerical Assessment

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1243/pime_proc_1989_203_025_01 ◽

1989 ◽

Vol 203 (3) ◽

pp. 133-141 ◽

Cited By ~ 2

Author(s):

R C McLean ◽

G H Galbraith ◽

D Stewart

Keyword(s):

Heat Stress ◽

Working Conditions ◽

Heat Balance ◽

Energy Exchange ◽

Environmental Parameters ◽

The Body ◽

Assessment Procedure ◽

Exchange Processes ◽

Numerical Assessment ◽

Physiological Reactions

This paper summarizes the factors which influence the energy exchange processes between an individual and his surroundings and the mechanisms by which the body attempts to maintain itself in a heat balance situation. Thereafter, the important physiological reactions to hot working conditions are described and, on this basis, a numerical assessment procedure is proposed. Examples are given of the use of this method in investigating the possibility of heat stress and estimating the time for which an acclimatized worker can safely be exposed in such circumstances. An increase in the permissible exposure time through a manipulation of the environmental parameters is also considered.

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Fatigue Analysis and Simulation on Engine Case

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.215-216.698 ◽

2012 ◽

Vol 215-216 ◽

pp. 698-703

Author(s):

Fan Wu Meng

Keyword(s):

Heat Stress ◽

Fatigue Life ◽

Working Conditions ◽

Research Result ◽

High Stress ◽

Heat Distribution ◽

Transient Stress ◽

Working Stress ◽

Maximal Stress ◽

Safe Working

In this paper, a model of an engine case is designed in Pro/Engineer for fatigue simulation. The meshing is created by the way of Abaqus. According to the working conditions, the boundary restriction of the simulation is defined. By the simulation, the heat distribution of the engine case is given, the causes of relatively high temperature areas are discussed, and the heat-stress distribution is drawn too. The high stress area in the engine case is discovered. The simulation result shows that the steady working stress is about 60MPa, the transient stress is between 90MPa to 120MPa, and the maximal stress is 136MPa. Based on the heat stress the fatigue life of the engine case is analyzed. The research result is a reference of the engine case safe working.

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INSTALLATION FEATURES OF SPATIAL LATTICE METAL COVERING OF A PRODUCTION BUILDING IN LIMITED SPACE CONDITIONS

URBAN CONSTRUCTION AND ARCHITECTURE ◽

10.17673/vestnik.2019.04.12 ◽

2019 ◽

Vol 9 (4) ◽

pp. 74-81

Author(s):

Yury I. DOLADOV ◽

Marina A. ZORINA ◽

Irina V. KHABUR ◽

Ekaterina N. BOKAREVA ◽

Daria A. DODONOVA

Keyword(s):

Spatial Structure ◽

Feasibility Study ◽

Working Conditions ◽

Industrial Building ◽

Construction Site ◽

Technological Feature ◽

Spatial Lattice ◽

Production Building ◽

Individual Design ◽

Space Conditions

A version of the project for the installation of the spatial structure of the coating of an industrial building was developed. The technological feature of the project was the presence of cramped working conditions. The feasibility study of the methods of assembly and installation of the coating, taking into account the peculiarities of the construction of the coating, the features of the construction site and the needs for lifting machines, showed the eff ectiveness of the installation of the coating with enlarged blocks assembled on the ground. Mounting the unit using a traverse allowed to reduce the estimated height of the hook and select a crane that does not diff er in the high cost of rent. It became possible to apply the adopted installation scheme provided that an individual design of the beam was developed. The calculation and design of the traverse itself was performed, as well as the calculation of the enlarged unit for the installation situation.

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Evaluation of Occupational Exposure to Heat Stress and Physiological Responses of Workers in the Rolling Industry

The Open Public Health Journal ◽

10.2174/1874944501912010114 ◽

2019 ◽

Vol 12 (1) ◽

pp. 114-120

Author(s):

Farough Mohammadian ◽

Ali Salehi Sahl Abadi ◽

Omid Giahi ◽

Jamshid Khoubi ◽

Amin Allah Zarei ◽

...

Keyword(s):

Heat Stress ◽

Linear Relationship ◽

Working Conditions ◽

Pearson Correlation ◽

Physiological Responses ◽

Physiological Parameters ◽

Rolling Industry ◽

Significant Difference ◽

The Mean ◽

Globe Temperature

Background and Objective: Many indices are used to assess occupational heat stress at the work environments. The aim of this study was to evaluate heat stress using Wet Bulb Globe Temperature (WBGT) index and Discomfort Index (DI), and by measuring physiological responses in the workers of the rolling industry and comparing the appropriateness of these indices for measuring heat stress. Methods: This cross-sectional study was carried out on 90 healthy workers of a rolling industry in eastern Tehran in 2017. Physiological parameters of core body temperature (Tcr) and Heart Rate (HR) were measured during the working shift according to ISO9886 standard. At the same time, environmental variables such as the natural wet temperature (Tnw), dry temperature (Td) and globe temperature (Tg) were measured and recorded at the workstations. Then, the DI and the WBGT indices were calculated using the related formulae. Data were analyzed using SPSS v. 21, t-test and Pearson correlation coefficient. Results: The mean heat stress indices were significantly higher in working conditions than resting conditions, and there was a significant difference between the physiological parameters of Tcr and HR in resting and working conditions (P<0.001). According to the screening criteria of DI, 43.3% of the workers were exposed to the moderate level and 56.7% to the severe level of heat stress. There was a significant difference between the mean WBGT and the Threshold limit values (t= 4.903, P<0.001). Pearson correlation test showed that there was a significant and direct linear relationship between the WBGT and the physiological parameters of Tcr and HR (r=0.317, P=0.002; r=0.434, P<0.001, respectively). The DI index had a significant and direct linear relationship with HR; (r=0.229, P=0.03). Conclusion: The results showed that WBGT is a more appropriate index for evaluating the heat stress of workers in the rolling industry. High heat stress levels at the workstations along with heavy physical activity are health risks for workers in this industry; therefore, interventions must be undertaken to reduce exposure.

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