| Safety, comfort and efficiency are the optimal targets of modern loader design. Loader cab is an important part that composes loader which has direct effect on the the layout of the cab. Comfort is the essential prerequisite to guarantee safty. The loader cab design based on ergonomics can provide the driver with comfortable driving posture, good field of vision and reasonable controller layout. in this way, it can make drivers finish their mission safely, comfortably and effectively, indirectly enhancing the loader's whole performance.There are six chapters altogether in this paper, mainly as follows:[1] PrefceThese years, due to the develop-the-west strategy and the policy of revitalizing the old industrial bases in Northeast region, etc, Earth moving equipments have been developping fast and all kinds of corporation are sparing no effort to contrive new products. They pay more attention to the novel shape and advanced manufacture technology which make operation simple and performance safe. However, new products have made much progress in the shape and comfort of the loader cab, there is still a large gap between domestic and foreign products. Overseas, the loader's development tendency is fast and high-level, and ergonomics has been used more widely and relevant criterion in the internal layout of the loader cab has been formulated. The two standards, SAE and ISO, are being widely used at home and abroad. Comparing with the foreign Ergonomics, we start later. However, we have also done some research, such as measurement statistic and analysis of the model of the human body publicized Chinese adult body size standards. These have given a certain impetus to ergonomics.[2] Loader cab's components design based on ergonomicsThis chapter will introduce the fundamental principles of ergonomics, founding two-dimension models of the human body and body size are classified into three percentiles: P5, P50 and P95,and the products can satisfy 90 percent the requirements . Depending on the ergonomics principle, and according to human dimensions of Chinese adults, this thesis will design the various components of cab, including seat, steel wheel, dashboard, joy stick and pedals in order to satisfy the Chinese drivers. Using CATIA soft, 3D models of the components have been established, which create necessary conditions for the cab's layout and compute simulation.[3] The cab's layout toolsH-Point is the datum mark of cab's layout, and it decides the driver's arthrosis angles and the position of layout tools such as eyellipse, head contour and hand-reach envelop etc. so H-Point also decides the drives'field vision, riding comfort, safety and operation advantage and so on. On the basis of analyzing the loader's characteristics, the human H point is taken as datum point and the posture angles are linked to comfortable seat, easy operation and wild vision to create two dimensional computer models which represent the geometry and movements of operator in seated postures. Applying MATLAB software, we can get the H point region. This region can supply theoretical base for the layout of cab design and checking purposes.This chapter will introduce loader cab's layout tools such as eyellipse, head contour and hand-reach envelop etc. Under the Conditions of the H-Point, according to the standards of SAE, ISO and GB etc, shape size and position in the cab are calculated, providing a theory instruction for the cab's disposal.[4] Loader cab's workspace designThis chapter will introduce the theory and design principle of the cab's workspace, and discuss the lay out of components correlating with ergonomics. Using CATIA software, layout tools'models which include eyellipse, the line of eyesight, Shin-Knee Position, head contour and hand-reach envelop have been established and it will study the angle of steel wheel, the relative distance compared to H-Point, dashboard's disposal and various instruments'layout combined with the theory of ergonomics. Thus, workspace design can satisfy the demand of wide field vision, riding comfort and operation advantage.[5] Loader cab's computer simulation basing on ergonomicsTwo kinds of Three-dimensional models of the Chinese body have been established in the CATIA soft by using Ergonomics Design & Analysis module. These models are applied to a very broad scope. Under certain constraints such as the H-point and seating reference point coincidence, they can define the model of the human body, and then do comfortable analysis, vision analysis and hand-reach envelop analysis, etc. Using these models, the simulation about the loader cab can be carried on CATIA soft to realize ergonomics design. By means of analyzing the cab's front-field vision and the driver's field vision when the bucket is at the lowest or highest position, the simulation validated wide-field vision of the loader cab has been done. Therefore, when comes to the light design, it should cover the above field vision, to fit the different work conditions. Through the analysis about the driver's arthrosis angles when the pedal is at the lowest position or untrammeled position, these angles are all in the comfortable scope which proves that the cab can satisfy the comfortable driving posture. By the way of analyzing the hand-reach envelop, manipulators are all under the control by hand comfortably and satisfy their demands. All in all, this research has been validated by the compute simulation.Eventually,using photo studio module of CATA soft, loader and cab can be textured materials colors, and load the model of human body for the purpose of simulating the real cab environment and the driver's working state.[6] ConclusionThe research on the loader cab design has been improved by this thesis. Utilizing of the Ergonomics embodies the mentality of People Oriented; H Point optimization by MATLAB and CATIA simulation have positive effect on enhancing the loader's performance,shorting the loader type exploration cycle and reducing the development cost; Meanwhile, it has further instructive significance on the loader's cab design.
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