Driving fatigue objectively manifests itself as an inability to meet the expected driving conditions. Many scholars give different explanations: Driving fatigue refers to the imbalance of physiological and psychological functions of the driver after driving in a certain environment for a long time. Comfort is a subjective feeling and is difficult to explain with an exact definition. The result has important practical significance and research value.įatigue, as a subjective feeling, is a person’s psychological perception of comfort or the lack thereof. This is done in order to effectively identify the fatigue state of the driver, protect the physical and mental health of the driver, and ensure the progress and smoothness of the operation. Therefore, we analyze the physiological characteristics of drivers in different stages of tractor driving fatigue, and study efficient methods for detecting the fatigue state of combine harvesters. The physical fatigue of the tractor driver directly affects the efficiency and quality of their operation. A variety of diseases caused by tractors and work trials often occur, and the health of drivers is seriously endangered. Therefore, according to the above factors, tractor drivers are prone to psychological fatigue and physical fatigue, which reduces their driving ability. The vibration generated by the engine and ground excitation is complicated, and the working temperature is high. However, due to the late start of ergonomics in the agricultural field in China, most manufacturers rarely consider the driving fatigue of tractors.Ĭompared with ordinary vehicles, the working environment of tractors is poor, and the level of the field is uneven. With ongoing modernization, designers gradually began to pay attention to the factor of driving comfort. For a long time, agricultural machinery companies have focused on the optimization of equipment and functions, but have ignored the human factor. Tractors are essential mechanical equipment for modern agriculture and play an important role in agricultural production. The number of tractors has increased year by year, which has greatly improved agricultural production efficiency and operation quality. Under the promotion of the state, the comprehensive mechanization level of agriculture in China has reached 63.48%. The level of agricultural mechanization reflects the comprehensive level of a country’s agriculture. The central link of agricultural modernization is the modernization of agricultural operations, i.e., agricultural mechanization. The realization of agricultural modernization is an important condition for China to transform from an agricultural country to an agricultural power. The established prediction model can also be used to objectively reflect the discomfort of the human body under different working conditions and provide a basis for structural design optimization. Finally, the vibration conditions are changed by the shock-absorbing suspension of a tractor, verifying the effectiveness of the physiological signal changing with the vibration of the human body. An artificial neural network model is trained with test samples, and the prediction accuracy rate reaches 88.9%. Furthermore, this paper proposes a vibration comfort evaluation method based on multiple physiological parameters of the human body. The test results show that with the increase of human fatigue, the overall physiological parameters show the following trends: The median frequency of the human body surface electromyography and the slope of skin surface temperature decreases, the value of skin conductivity and the mean value of the photoplethysmography signal increases. Several features of physiological signals as well as the law of signal features changing with fatigue are studied. Four physiological signals of surface electromyography, skin electricity, skin temperature, and photoplethysmography signal were collected while the subjects experienced vibration. To investigate this possibility, in this paper we carried out a collection experiment of human physiological indicators relevant to vibration fatigue. Long term operation in this environment will resonate with the organs and affect drivers’ health. The low frequency vibration generated by the engine and ground excitation is similar to the natural frequency of human organs. The vibration generated by tractor field operations will seriously affect the comfort and health of the driver.
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