Research On Fatigue Characteristics And Layout Optimization In Narrow Working Cabin

With the development of productivity,people freed from heavy manual work gradually.However,with light load work for a long time,work-related musculoskeletal disorders are attracted people’s attention gradually.Because of small work space in the narrow work cabins,people not only need to take a long time to keep working posture,but also accompanied by high pressure,hypoxia,cold,and so on.Since there is nearly no comfort in narrow work cabin,reducing muscle fatigue become more important than comfort.The research is sponsored by the National 863 Plan(No.2009AA093303): A research on the design of 4500 meters manned cabin and the key technology research of subitems—— A research on design method of cabin layout optimization.In order to study and resolve the problem of small cabin layout optimization from the perspective of industrial design,this paper reviews the use of ergonomics,biomedical,artificial intelligence and other disciplines of knowledge.Meanwhile,human muscle fatigue will be studied as a solution to the problem of man-machine layout optimization.Then,the criteria of layout optimization design and evaluation is not degree of comfort but human muscle fatigue characteristics.And the human muscle fatigue characteristics can help to solve work related musculoskeletal disorders which are brought by the development of modern productivity.For the special working environment of narrow working cabin,this paper studies the human body fatigue characteristics in narrow working cabin.At the same time,it builds a 3 D model of the human body fatigue characteristics,which can be used for small cabin layout optimization design and small cabin layout work assessment.And the purpose of this article is to guide layout design and working posture in small cabin,then workers in small cabin will be healthy,efficient and security.The main contents and innovations of this paper are as follows:1)For such special human-machine space,human fatigue characteristics have been offered as a research starting point.From explore the history and current situation of layout issues,problems of the combine of the human-machine layout and ergonomics are analyzed.Combined with ergonomics,biomedical,artificial intelligence and other fields,the theoretical framework of narrow cabin layout optimization worked on human fatigue characteristics is proposed.2)The design of human body muscle fatigue testing.(1)In order to collect the datas of muscle surface electromyography as much as possible,the article uses orthogonal experiment.(2)Adopting the combination of subjective fatigue questionnaire and objective test methods to collect datas.(3)According to the narrow working environment,the experiments are divided into upper limb muscle test and neck muscle test.And the upper limb muscle tests are divided into two cases of static and dynamic data collection.(4)The small size of the narrow working space decides the ranges of upper limbs and neck.(5)Making assistant experimental materials in order to obtain the accuracy data.(6)It sets up the experimental environment according to simulation a narrow working space.(7)Making scientific conclusion by combine the values of RPE and fatigue time,meanwhile,using MPF slope as the index of fatigue characteristics.3)The human three-dimensional model of fatigue characteristics in narrow working cabin is built up.First,by RPE questionnaires,human muscle fatigue tests,MPF slope values and fatigue times,combined weighting method and orthogonal calculation to give different weights to upper limb muscles.Then the experimental fatigue characteristics of human values are obtained by using entropy method for correcting muscle weights.At the same time,the other fatigue characteristic values are gained by using the weighted of fatigue characteristics.Then,according to the joint angle to achieve the spatial fatigue characteristics of the upper limb and neck,the values of the upper limb and neck fatigue characteristics of the human body in three-dimensional space in each region are calculated.Finally,the solving tool for get the values of human fatigue characteristics is developed by database technology.It can get the upper body fatigue characteristic values of each angle quickly and efficiently.And it can be used for postural assessment in small working apace,as well as providing some data support for the layout design and evaluation in small work space or similar small work space.4)The layout optimization method of narrow working cabin based on human body fatigue characteristics.First,Combined the experimental data,the layout space and the devices are distributed man-machine weights.Subsequently,the man-machine characteristic values of layout space and devices are calculated,which include the human-machine characteristic values and human fatigue characteristics values.Finally,intelligent layout optimization method of narrow working cabin is established by the combination of fatigue characteristics and ant colony algorithm.Using ant colony algorithm,the pheromone update method which combined human fatigue characteristics is built by the intelligent layout optimization design in narrow working cabin.5)The layout evaluation method of narrow working cabin based on human body fatigue characteristics.First,combined analytic hierarchy process with grey theory,the expert weights are amended.At the same time,the weights of equipment in the narrow working cabin are set by using the analytic hierarchy process.Then,using the data experiment obtained,the fatigue characteristics of devices which include persistent manipulation devices,recurrent operating devices and display devices are evaluated.At last,the sum values of each devices fatigue characteristics are fatigue characteristics values of every project.This thesis follows from theory to practice,abstract to concrete.Starting from ergonomics,it studies human body fatigue characteristics in the narrow working cabin.Then the problem of layout optimization and evaluation in the narrow working cabin is solved.Meanwhile,layout optimization method of narrow working space which is applied to 4500 meters manned cabin console layout optimization design is benefied to reduce operator fatigue effectively to improve human-machine environment in manned cabin console.