**4.2.1 Description of study area**

182 Fuzzy Inference System – Theory and Applications

In the present study industrial noise measurement technique carried out at three different industries (ITO power plant station, centrifugal pump industry WPIL India Limited, and Shriram Piston & Rings Limited). Selection of industry was based on requirement of study i.e., worker working under different noise levels as well as cognitive task type (simple, moderate, and complex). Questionnaire established with a group of questions refer to parameters will be effected by the noise levels as well as type of cognitive task. Questionnaire asked questions about the age, skill discretion, psychological job demands, etc. Likert scale is used to evaluate the answers density from strongly disagree to strongly agree. Operators and supervisor fulfils the questionnaire on the working day after 8 hrs continuous working, Questionnaire form contains 55 questions. Only workers doing cognitive task were taken in this study. To check the reliability of the survey, the cronbach's alpha value was calculated. Similar sets of items of the questionnaire were identified and cronbach's alpha was calculated [2]. If the value is more than 0.7, then the survey was considered to be reliable. Present model include three inputs and one output, first input is noise level measured by sound level meter, second and third inputs were age and cognitive task type, assessed by questionnaire, and one output was reduction on cognitive task

Literature Review

Categorization of industries 1- Simple, Moderate, and Complex Cognitive task

Noise measurement & its mapping

Collection of data Questionnaire survey (rating)

Data applied in MATAB (fuzzy logic toolbox) using ANFIS

Data training and testing (model validity)

Result

Stop

**4.2 Material and methods** 

efficiency assessed by using the questionnaire also.

Fig. 4.1. Flow diagram for methodology

A 330 MW Pragati power station is located in New Delhi, latitude (28°37 ׳ -28°38 ׳ ( at longitude (77°14 ׳ -77°15 ׳ ( near (Income Tax Office) ITO beside the highway at 0.3 Km from World Health Organization (WHO) building as shown in Figure 4.2. A centrifugal pumps WPIL India Limited, located in Ghaziabad, latitude (28°40 ׳57 (at longitude (77°25׳41 (as shown in Figure 4.3.

Fig. 4.2. Geographical location of I.T.O power plant (New Delhi).

Fig. 4.3. Geographical location of centrifugal pumps WPIL India Limited (Ghaziabad).

Fig. 4.4. Geographical location of Shriram Piston & Rings Ltd (Ghaziabad).

Some Studies on Noise and Its Effects on Industrial/Cognitive Task Performance and Modeling 185

moderate, and complex). Noise levels prevalent in the industries were graded as (low, medium, high), while workers were graded into three categories as (young, medium, and old age workers). Then noise levels and age are scaled from 40 dB(A) to 110 dB(A), and 15 to 65 years respectively, and Cognitive task type scaled from (1) strongly disagree to (5) strongly agree. While the output (cognitive task efficiency) classified as questionnaire answers weight (0%=strongly disagree, 25%=disagree, 50%=neutral, 75%=agree, and 100%

Data may be obtained either from the primary source or the secondary source. A primary source is one that itself collects the data; a secondary source is one that makes available data which were collected by some other agency. A primary source usually has more detailed information particularly on the procedures followed in collecting and compiling the data. Many methods for collecting the data such as direct personal interview, Mailed questionnaire method, indirect oral interviews schedule sent through enumerators,

So our data is direct personal interview method, under this method of collecting data , there is a face to face contact with the persons from whom the information is to be obtained

1. To determine the effects of noise on the workers under different cognitive task type.

 The information obtained by this method is likely to be more accurate because the interviewer can clear up doubts of the informants about certain questions and thus

The language of communication can be adjustable to the status and education level of

 The answers of the questions arranged in ranking order (low, medium, high and very high etc.), because answers easily implemented in Fuzzy logic toolbox. Its detail can be

To obtain occupants opinions on the industrial/cognitive task, questionnaire was administered. This questionnaire was consisting of 55 questions related to cognitive work effects on industrial worker performance in different noise level environment. The objective of the detailed survey was to confirm and clarify the results obtained from the short-form

Due to the direct interaction the correct and desired information collected.

4. To determine what parameters have negative and positive affect to noise level.

5. To find the threshold level of noise on industries for this kind of task.

This method suitable for this study, the explanations are following:

=strongly agree). Model was constructed according to questionnaire form responses.

**4.2.3 Questionnaire studies (surveys) in the industry** 

2. To determine the effect of the noise level on workers age. 3. For specifying workers comments on protection from noise.

6. To feed back these data to neural fuzzy logic model.

**4.2.5 Why we used the questionnaire survey?** 

Information from correspondents etc.

**4.2.4 Purpose of the questionnaire** 

obtain correct information.

the worker or operator.

seen in the section 4.6

(known as informants).

Shriram Piston & Rings Ltd. is located at Ghaziabad, latitude (28°41׳07 (at longitude (77°26׳06 (as shown in Figure 4.4.
