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Regional development is related to population structure closely. The study starts with regional conditions of Kunming, Kunming statistical data and population census data in related years are applied for interpreting population structure in Kunming under the background of big data. Multiple regression system is combined for analyzing the influence of population structure change in Kunming on economic...
With the advantages of high efficiency and zero emission, electric vehicle with proton exchange membrane fuel cell (PEMFC) owns a broad application prospect. Parameters matching design for the powertrain consisting of electric motor, reducer, fuel cell engine and battery mainly is carried out. Drum test results show that the power performance of the vehicle satisfy the design requirements. And energy...
ICE speed adjustment problem, which is encountered during gear shift process without disengaging clutch under traditional AMT, was introduced. Working principle and structure of a novel fixed axis gear active transmission were described, by which EM couples with the input (HEV-SI) and output shaft (HEV-SO) selectively by automatic switch actuator. Under the former mode, EM can work efficiently by...
This paper expresses one-to-many transformations by extending relational algebra to resolve the problem that relational expressions are difficult to execute one-to-many data transformations, the recursive query and the table function should be employed to realize unbounded one-to-many transformations for producing one or several output tuples over every input tuples. Recursive queries create original...
In this paper, firstly put forth design scheme of Multifunctional test-bed for in-wheel-motor; secondly designed test-bed's mechanical structure and electronic control system according as design scheme, finally validated test-bed accord with design requirements via test.
In this thesis, the ability of Steer-by-wire has been analyzed and proved to increase precision, decrease turning radius and decrease wheel angle. Meanwhile, feedback control has been proved available in the Steer-by-wire system.
In-wheel motor drive system that the torque of each drive wheel can be independently controlled has high transmission efficiency. But the main shortcoming of in-wheel motor drive system is the large non-sprung mass which influences the automobile ride. The paper has introduced the basic structure and working principle of a novel electric wheel drive system with reducer for non-steering wheel. On the...
The hydraulic lift system of the aerial work platform is mostly driven by the diesel engine. When doing altitude work, the noise of the engine is big and the exhaust emission is serious. While maintaining the structure and function of the aerial work platform's hydraulic lift system, increase a hydraulic system driven by storage battery and motor to achieve the purpose of saving the energy sources...
The research focus on the general layout, design and optimization of the chassis for EV. Each component will be concerned when make the general layout, aim to avoid interference of the components and fit the traditional user's custom. Meanwhile the human engineering is also taken into the consideration within the design process. The lightweight of the chassis bases on the result of analysis in Hypermesh.
Electric vehicles shut off the electric braking only rely on the hydraulic braking while emergency brake, it Although make control algorithm easy, but doesn't make full use of the fast and accurate advantage of the electric braking, and doesn't make better quality of the Anti-lock Braking System if make use of motor's driving torque while wheel is about to braked. so developing new control methods...
In this thesis, a new type of steering system is designed that the stepping motor links the worm gear reducer and drives the wheel to steer. Considering the requirements of the car, chooses the suitable suspension and calculate the main parameters, the resistance from the steering and the parameters of the motor. Design a Fault-Response- System, so the vehicle can guarantee the basic steering function...
In the present work, the model of the performance testing room for refrigerating container was developed. This model is used to investigate the velocity field and temperature field under two different air supply schemes which are upper supply-upper return and horizontal supply in the testing room. The results show that the velocity field and temperature filed of the horizontal supply scheme are more...
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