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3D reconstruction is a challenging work for the autonomous navigation of robots. This paper proposes a novel 3D reconstruction method based on projection of virtual height line (PVHL). At first partition the scene scope uniformly into grids with a certain size. Then introduce virtual height lines (VHLs) which do not exist in the scene. Each VHL is projected on left image and right image, and two projection...
The positive displacement motor (PDM) is a very important downhole motor in petroleum exploration and production. The key element in PDMs is the rotor-stator coupling which converts hydraulic potential of high-pressure fluid medium into mechanical energy. Normally both the rotor and the stator are constituted of cylindrical helix surfaces. The PDM's characteristics directly rely on the machining quality...
In this paper, a 12-bit 50-MS/s pipeline analog-to-digital converter(ADC) is presented. A digital-adjustable bias current generator scales the opamp bias currents. By this means, the power consumption can be adjustable according to the use. The switched-capicitor comparator is used to improve the sub-ADC' accurrency and minimize the offset. The effective number of bits is 11.3 when a input signal...
A car handling simulation model was built by using multibody dynamics software ADAMS/CAR. In the model, we have considered the front and rear suspension system, steering system and the tires model in detail. Designed to test vehicle handling and stability of the serpentine line of tests and the testing process simulation and the data processing, the real vehicle data and simulation data are in good...
Representation and reasoning mechanism are the core and basis of the expert system. A good design of the knowledge representation and reasoning mechanism is very important. It will have a direct impact on the performance of expert system. In this paper, an expert system for prevention and control on stored grain pests is constructed base on frame knowledge presentation and case-based reasoning.
Damping changeability design and evaluation is the most fundamental issue at the beginning of any new semi active hydraulic damper or its control system development. In this study, the changeable damping strategy for the sky-hook control of a rail vehicle semi-active hydraulic damper, which has three parallel orifices, is designed. Fluid formulae for the changeable damping calculation under different...
A chaotic system with constant Lyapunov exponent spectrum is reviewed and its evolvement is investigated. The remarkable particularity of the system is that there exists a constant controller in this system, which can adjust the amplitude of state variables linearly, however, the Lyapunov exponent spectrum of the system is independent and kept on constant. After some basic dynamical properties of...
High dimensional data clustering is always of great difficulty in clustering research. Before the clustering process is accomplished, the partition of the objects is unknown. Therefore after the clustering process, the results of the final clusters should be presented understandably, which will be strictly difficult when it comes to high dimensionality. This paper presents a cluster description schema...
The objective of this paper is to compare the merits of back propagation neural network (BPNN) with those of cross-nested logit (CNL) model to estimate the simultaneously joint choice of residential location and commute mode choice during the process of employment surburbanization. Back propagation neural network and discrete choice model specified as cross-nested logit have been respectively employed...
During the gasoline engine start process, air fuel ratio of gasoline engine always greatly departs the theoretical air fuel ratio by the affection of intake pipe fuel film. To decrease exhaust emission in engine start process, the dynamic characteristic of intake pipe fuel film is analyzed; a new dynamic fuel film model of intake pipe based on Aquino model is presented, and a fuel compensation method...
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