For the further development of hybrid technology and energy recovery technology application to improve energy efficiency. Research on hybrid bicycle control system comprising a brushless DC hub motor control and energy recovery process, the system selects STC12C5620AD as the control for brushless DC...

It is a brand-new research in combinatorial matrix theory to extend the exponent of traditional single nonnegative primitive matrix to the exponent of nonnegative primitive matrix pairs. With the knowledge of graph theory, the problem of primitive exponent of nonnegative matrix pairs can be transformed...

This paper proposes an integrated the technique of multilevel workflow and multilevel BOM configuration for the intractable problem on multilevel workflow and multilevel BOM configuration. The technique mainly refers to creating a mode of multilevel workflow and multilevel BOM configuration in PDM, a...

The vibration of high precision cylindrical roller bearing is affected by many factors, which belongs to the problem of poor information. This article based on the poor information system theory and the qualitative fusion principle, and a variety of methods are used to analyze the main factors that affect...

A kind of leveling device of intelligent chassis is designed thus vehicle driving platform can be maintained at level state constantly, directing at problems that drive platform cannot automatically remain level, and even overthrow accident of vehicles occurs when small-size hillside operational vehicle...

The ball end mill, as an important tool to process the complex three-dimensional curved surface, is helpful to achieve high efficiency and high precision machining when was used with nc machine tool, which is highly demanded in the manufacturing factory. This paper further analyze the processing theory...

Nowadays, the energy problem is undoubtedly the world's leading problem . The use of air-conditioning in it takes a big part, so reusing of the residual energy is very meaningful, At present, the exhaust heat recovery system in this field is mostly aimed at the large central air-conditioning, merely...

Targeting the doubly-fed wind power system, this paper establishes the overall mathematical model composed of wind turbine, drive system, double-fed induction generator, stator flux orientation vector control tactics, maximum power point tracking tactics. By applying the simulink in the matlab software,...

Hierarchical fuzzy sliding-mode decoupling control method is adapted in this paper, and the nonlinear system of a double inverted pendulum is decoupled into several subsystems, an adaptive law based on the Lyapunov function is used to tune the coupling factor of the hierarchical sliding-mode controller,...

While deployable antenna works in space, there are little or no gravity effects on antenna's state, and it is no need to analyze antenna's cablenet system with considerations of gravity effects. But before launching, deployable antenna is to be assembled and tested in ground conditions, so in this situation,...

A new structure named 'collapsible fan blades' is presented in this paper, which is fixing blades and a spring via metal rods. In this structure, based on Betz theory, the furl of the fan blade is realized by compressing the spring. On the purpose of getting relation between wind speed and power, this...

With the rising cost of energy and growing environmental concerns, the demand for sustainable building facilities with minimal environmental impact is increasing. Sustainable building is rapidly transforming the design and construction industry around the globe. Simultaneously, a growing numbers of industry...

In recent years, due to the improvement of human ecological environmental protection awareness, more birds can live in harmony with mankind. Therefore, it also has a significant impact on the human production . Therefore, this paper designed a device for driving birds, in order to drive birds which can...

The sensor used for mine was the monitoring system of coal mine. It was used to monitor the coal mine environment parameters and process parameters, and transmit various physical quantities into electrical signals. In this paper, a new type of ultrasonic wind speed sensor was designed, which had the...

In view of the problem that improper positioning of external lithotripsy, frequent replacement of electrodes, poor discharge stability, focus drift and high cost, it is designed a kind of extracorporeal shock wave lithotripsy with X-ray and laser double - positioning. The ADAMS software was used to simulate...

The paper mainly discusses the invention of an intelligent bird-repellent device based on the Raspberry PI--an open source hardware platform. Based on Raspberry Pi development board, embedded system is used. Python language is used based on Linux system. By controlling of the GPIO pin, detection of ultrasonic...

As a subdivision and backbone project of engineering of drawing water from Datong River into Huanshui River, the water transfer for main channel project is designed to transfer water from Datong River to Huangshui River, with the total amount of 3.6ž108m3 in a short-term and 7.5ž108m3 in a long-term....

There were a lot of research on the error truncation analysis of the damping system. However, the theoretical methods that in the analysis of vibration structure and dynamic response are complex and diversified, and there is no completely unified theoretical standard. The main contents of this paper...

Point at the series of drawbacks on those traditional manual cleaning methods, a new streetlight lamp pole automatic cleaning device is put forward. This device possesses the features of high efficiency, low energy consumption, low cost and convenient operation. The main body of the lamp pole cleaning...

Through the observation of the typical plant lotus leaf, rice and nasturtium etc leaf surface wettability, the leaf surface structure of scanning electron microscope, contact angle measurement, self cleaning mechanism of comparative study of typical plant leaf surface structure, clarifying the typical...

A Petri net with controller is used to model blocking flexible flow shop scheduling problem(BFFSP) with results obtained based on genetic algorithms(GA). The objective of scheduling problems is to minimize the maximum completing time(makes-pan). Firstly, the mathematical model is constructed for this...

Biomass being clean and renewable energy with low pollution, the utilization of it can reduce greenhouse gas emissions, solve ecological problems and achieve sustainable development. Biomass gasification is one of the main forms of straw biomass energy utilization, and household biomass gasification...

The vibration of high precision cylindrical roller bearings is affected by many factors, which belongs to the problem of poor information. The experimental results show that the main factors influencing the vibration of the experimental bearing are the clearance, the roller convexity and roughness, the...

Aiming at the characteristics of hilly and mountains region such as undulating terrain, small field, irregular, steep slopes and multi-bends, etc. and the problem against the mechanization of field operation, the paper designs a kind of small multifunction chassis hydraulic leveling device. The whole...

Nuclear power is a clean, safe and mature technology, strong supply capacity, to large-scale application way of generating international technology development leveled off in 2015, the Chinese reactors construction accounted for 40% of the world. International nuclear energy application of the third...

In recent years, various types of high-voltage transmission lines on the frequent accidents. Some of these serious accidents can even lead to a large area of power outages. A large part of these accidents is caused by bad dangers. Therefore, it is necessary to design the environmental monitoring device...

In order to measure the shallow wave velocity and improve the accuracy of traditional observation by naked eyes, we design the measuring device of shallow wave velocity. We use dripping to start the shallow wave, capture the image at a fixed time interval for the video of shallow wave, and get grayscale...

Through vissim simulation, we found that if the shape of the merging region is an isosceles trapezoid, the length of the merging region and the length of the straight line after the toll station are longer, the performance is better, but the cost will be increased accordingly. We analyzed the vehicle...

The cracking moment in negative moment area of the composite beam can solved by analyzing the strain difference between the steel beam and the concrete. The influence of shear slip between the steel beam and the concrete was considered to control cracks of the concrete more accurately. Verifying the...

The intention of this thesis is to explore the concrete realization method of reverse engineering technology in the field of development of sports shoes, how in the rhino software environment, reverse modeling two-demention drawings from product, especially how to generate 3D reconstruction of product...

Expounds the connotation and research method of Bionics Engineering, introduces the animal bionic information, leaf surface wettability, morphology and function of bionic bionic structure in engineering application, and their research progress and application prospect were analyzed and prospects.Introduction...

In order to obtain the main influence factors of bearing vibration, based on correlation analysis of fuzzy set theory, channel radius of curvature, channel shape error and channel surface roughness are selected as processing quality parameters to research the influence degree of different processing...

With the rapid growth of china's national economy, china's road transport industry has been rapid development, as one of the three key elements of traffic management, the important role of vehicle technology management in road transportation management. This paper analyzes the transportation enterprises...

This paper investigates and discusses the current situation, necessity of teaching reform, teaching mode, and improvement of teaching system and teaching method in the Engineering Mechanics course to meet needs of cultivation of excellent talents in the field of civil engineering. Several improvements...

In this paper, the main vibration frequency is obtained by the finite element analysis of the shaft joint, which can avoid the resonance of the wire rope coupling system in the actual work. The finite element model of slow-speed of revolution coupling is established. The model is used to simulate the...

In order to obtain optimized forging forming process parameters, multi-objective optimization strategy of process parameters based on response surface method (RSM) was put forward. Taking strain uniformity and forming force of large-scale arc-shaped forging as the evaluation index, the analysis model...

Analysis on the influence degree of processing quality parameters on bearing vibration belongs to the problem that the probability distribution is unknown and the correlation is complex. Only classical statistical analysis is not comprehensive. In this paper, by selecting the channel radius of curvature,...

In this paper, the structure of a large spaceborn deployable antenna is optimized in condition with its working state. The main aim is to obtain the lightest antenna's weight for lower costs. In the optimization process, the optimum mathematic model is established with outer radius of antenna's beam...

The preparation of nano-crystalline manganese-zinc ferrite was affected by the pH value greatly in the network gel method and the optimum pH value was the range of 9~11. Monophase manganese-zinc ferrite without impurity phase could be obtained via adding additive after sintering at low temperature. The...

The aluminum doped ZnO thin films were prepared on quartz glass substrates by RF magnetron sputtering at room temperature with varying sputtering pressure. As the sputtering pressure increased, the crystallinity of AZO thin films improved and the surface crystallite size increased. The optimized AZO...

Industrial robot has become essential important equipment in advanced manufa- cturing industry. As one of the practical current robot technology research, industrial robotic vision-guided technology lays the foundation for application of the industrial robots in the smart line. Visual guidance use image...

The lathe bed is an important part of the machine tool. It plays the role of supporting the column, the table and other components. The performance of machine bed tool directly affects the machining precision of the machine tool. In the process of dynamic optimization design of HX7910 pentahedral machining...

Manipulator is a powerful tool which can help people to carry out the safe operation, production automation and improve the productivity of labor. Based on the summary of the situation of research and development of manipulator, this article analyzes the functions of parts moving manipulator and carries...