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Showing 5 results for Workshop

Rostam Golmohamadi, Homeira Alizadeh, Majid Motamedzade, Alireza Soltanian,
Volume 1, Issue 3 (12-2014)
Abstract

Background & Objectives : The comfort lighting in the workplace provides employees visual health which can improve safety, visual comfort and enhance performance and product quality. The present study was conducted to evaluate general and local lighting in carpet weaving workshops in Bijar city .

Methods : In this descriptive analytical study, 101 carpet weaving workshops were randomly selected. The illuminance were measured based on the models and formulas presented in Illuminating Engineering Society (IES) using luxmeter model Hagner EC1 in height 76 cm from the ground surface. The local illuminances were measured in horizontal and vertical weaving level. Data were analyzed by SPSS software (version 16).

 Results : Research findings revealed the average of total and artificial illuminance level were 484.5±458.9 and 80.0±49.9 Lx respectively. Mean total, natural and artificial illuminance 39.6, 57.4 and 100 percent were lower the recommended 300 Lx levels. The average of minimum of local illuminance was less than 500 Lx in all workshops.

Conclusion : About 60% of workrooms had the acceptable general illuminance levels in middle day. However, due to the insufficient lighting sources in workshops, the artificial illuminance levels are unsuitable. Therefore, it is necessary to improve general illuminance levels by reform and repair artificial lighting systems or redesign them in carpet weaving workrooms.


Masoud Shafiee Motlagh, Mohsen Aliabadi, Reza Shahidi, Amin Kahani,
Volume 2, Issue 3 (12-2015)
Abstract

Background & Objectives: Desirable and ergonomic lighting in the workplaces has a significant impact on the visual effects and improve the efficiency and productivity of employees. This study aims to evaluate the lighting system and feasibility of improving the artificial lighting system for comfort lighting in the workshop of the Fourth South Pars Gas Refinery.

Methods: In this descriptive-analytical study, the environmental conditions of the studied workshop were evaluated and the illuminance was measured in both day and night times at 216 points. Based on lighting measurements, a site map was provided. Further, based on current conditions of the workshop, illuminance was estimated using DIALux 4.12 lighting calculations software. In regard to the national recommended limits for industrial lighting and the current luminaires, the different practical, accessible and low cost solutions were presented. Using the mentioned software, the share of each proposed solutions for improving workshop lighting were estimated.

Results: The results showed that illuminance of the workshop in day and night times were equal to 197±71.5lx and 160±50.6 lx, respectively. The same results were also acquired by software calculations. Based on the results, lighting system was considered as undesirable lighting system along with need to modifications. Workshop lighting can increase between 260 lx to 405 lx through employing the proposed solutions based on the software predictions.

Conclusion: The results confirmed that the low cost and simple solutions can significantly be improved the ergonomic and comfort lighting in the workplace. The use of the specialized tools calculations by experts and designers can be also facilitated the conducting feasibility reliable.


Rostam Golmohammadi, Keivan Saedpanah, Behroz Ramezani, Mohammad Kohsar Moieni,
Volume 2, Issue 4 (3-2016)
Abstract

Introduction: noise pollution has a negative effect on physiological parameters, efficiency and auditory system. The aim of this study was to evaluate the performance of a sound screening method for estimating sound risk in small workshops of Hamadan city.
Methods: This cross-sectional study was conducted in 22 plants with more than 20 workers. Noise screening was done using a screening form. Next, noise level was measured at all the plants by SL 4001 sound level meter and regular grid method. Data were analyzed using Pearson’s test and linear regression by SPSS version 16 software.
Results: The mean (SD) scores of sound pressure level and screening form were 80.12 dB (7.277) and 60.50 (8.964) in the 22 understudy plants, respectively. The average measured workshop area and volume were 1448 and 10300, respectively. Pearson’s test revealed a significant relationship between the results of the two methods, (P > 0.046). Also the
percentage of workers at risk (greater than 85 dB) was 32.29 and the percentage of workers within safe limit (less than 85 dB) was 63.3. While the largest percentage of workers in the caution zone (82 dB) was 67.04.
conclusions: A correlation was shown between the results of the two methods. The use of this method to identify workshops with the possibility of noise pollution is effective.


Dr Mohsen Aliabadi, Dr Rostam Golmohammadi,
Volume 7, Issue 3 (11-2020)
Abstract

Background and Objective: Noise absorber is considered the main method for noise control in propagation path. This study aimed to evaluate the effectiveness of environmental noise control using noise absorbers at a press workshop based on the recommended ISO 11690 method.
Materials and Methods: This experimental study was performed at a press workshop of  a metal structure company. The environmental noise control was established by the installation of a metal mesh using perforated gypsum tiles with a layer of stone wool at the ceiling. Afterward, the evaluation was conducted based on the ISO 11690 method which included the determination of the rate of noise reduction measurement from an omnidirectional source based on the distance doubling. Moreover, the noise level was measured at the defined distance from an artificial noise source along with the length of the workshop.
Results: The environmental noise was reduced approximately (3 to 4 dB) after the installation of an acoustic ceiling. Furthermore, the environmental noise reduction was considerable at the frequency spectrum of 2000 Hz, 4000 Hz, and 8000 Hz. At the press workshop, the noise was reduced 4 dB based on the distance doubling from an omnidirectional source indicating a reduction in the surface noise reflections of the press workshop
Conclusion: The efficiency of the environmental noise control was determined at high accuracy using noise reduction curve from an omnidirectional source, comparison of the results with the recommended optimal conditions, and sound propagation pattern in the free field of the sound.

Fereshteh Sadavipour, Habibullah Dehghan,
Volume 11, Issue 3 (10-2024)
Abstract

Background and Objective:
Harmful factors in the work environment are any factors that have a detrimental effect on the health of people in the work environment. Timely and successful identification of these factors not only improves the health of the workforce, but also reduces the days of absence from work and the resulting economic losses, and leads to job satisfaction and increased productivity. Therefore, this study was conducted with the aim of investigating the lighting condition and the factors affecting it as a harmful physical factor in industrial workshops with less than 20 people in the northeastern region of Isfahan.
materials and methods :
This cross-sectional descriptive study was conducted on 500 industrial workshops under 20 people in the northeast region of Isfahan. The studied workshops were selected from 1000 existing workshops by simple random sampling. The light intensity was measured by HAGNEREC1 luxmeter. First, the basic information of the workshop and factors affecting the lighting intensity (cleanliness, color and reflection coefficient of surfaces, cleanliness of lighting sources and windows, uniformity index and number of lighting sources) were recorded in the workshop. Then, the lighting was measured with the standard method mentioned in the book of occupational exposure limits, fifth edition, 1400, and the lighting conditions in these workshops were checked and the measured values ​​were compared with the OEL standard limits. Finally, the data was analyzed by ANOVA test, Pearson's correlation coefficient and descriptive statistics tools.
 

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