Making use of micro Doppler Effect measured by continuous wave radar (CW radar), the micro Doppler modulation mathematical model of radar echo cased by projectile rotation is established, and the analytic relationship between projectile rotation and micro motion is deduced. Based on Hilbert-Huang Transform...

In order to inspect the condition of micro tools automatically and accurately in the micro milling process, a vision based on-machine measurement method is studied in this paper. The proposed methods can measure tool dimension, spindle radial runout and acquire the microscopic image with full depth of...

In order to improve the algorithm efficiency, expand the scope of application, we study the mobile robot path planning technology based on improved genetic algorithm. In this paper, we design a new adaptive function, which contains the path length information, the collision penalty factor, and the path...

At present, the problem of global path planning research most concentrated in the known information conditions. But the path planning of mobile robot is still an important problem to be solved in dynamic environment. In this paper, the ant colony algorithm is improved to solve the robot path planning...

Through Silicon Via are the widely used interconnects in the semiconductors industry. They are designed in different ways to meet the market demands. These interconnect need protection from both internal and external pressures. The pressures result from heating of the components on the chip which enhances...

Facing the precise fast posture adjustment problems of aero-engine for their large dimension, heavy weight, low stiffness, small installation space, as well as high precision and high efficiency of assembly task requirements, a new 2-PRR planar parallel mechanism is proposed to meet the elevation and...

The design of the main use of lightweight car to complete the cleaning robot path planning in reality, detection by infrared detection head, can be self completed indoor cleaning line. The robot through the infrared probe sensing the environment information, the establishment of the coverage map of the...

Multi sensor fusion technology of vehicle tracking is a set of environment perception, planning and decision-making, auxiliary driving level functions in an integrated system and is an important part of the intelligent transportation system. It has wide application prospects in military, civil, space...

Based on arbitrary Lagrange-Euler method, a vortex ring parachute simulation model was set up, and its inflation was studied under the condition of infinite mass and low-speed airflow. Through changing line length, canopy area and airflow velocity, the inflation processes were simulated, and the time-histories...

The front-wheel alignment parameters of vehicle are generally decided based on some dynamic performances of suspension system or some empirical equations, however these approaches have some shortage to obtain an excellent overall vehicle performance. A design approach of front-wheel alignment parameters...

According to the working mechanism of wet clutch and brake, nonlinear dynamics of teeth of friction disc strongly influences the dynamic behaviours. By utilizing Hertz contact theory and elastohydrodynamic lubrication theory the thickness and equivalent stiffness of oil film between inner gear of friction...

Research on the errors recognition and measurement technology for the Numerical Control machine tools based on laser testing technology is the main content of this paper..In this paper,Renishaw laser interferometer and high accuracy displacement sensors are used to measure the positioning errors and...

The weighing of granular materials is generally implemented through the detection and control of weighing instruments, which control the vibration intensity according to the weight of incoming material measured by the sensor, and finally assure the material weighing accuracy under certain speed. Vibration...

This article combines association analysis and visualization methods, mining relations and laws for car parts repair. Firstly, process the original data into data that can be used in the association analysis, then use apriori algorithm of association rules method for mining association relationships...

Experimental Advanced Superconducting Tokamak(EAST),which is a full superconducting tokamak with D-shape vacuum vessel, has been set up by ASIPP since 2006. When the harsh working condition especially the radiation is taken into consideration, it’s difficult to obtain the information about the in-vessel...

In this paper, reducer test bed is structured into two categories from the working principle, open power flow test bed and closed power flow test bed. Analysis of the constituent elements of the gear unit test rig, described the current development situation reducer test bed, summarizes the development...

Based on the phenomenon of broken in the running process of the drive Gear shaft of Automobile Axle. It was found that the major site of broken for thread and spline connected region. The process of the gear shaft and the shaft material of the broken and the structure of thread and spline connected region...

Finite element model of a full load bus is built and a simulation experiment on the rollover crash is carried out. Simulation data is consistent with the experimental data, indicates that the finite element model is effectiveness. Bus superstructure deformation and regularity of energy transfer are analyzed,...

Progressive cavity metering pump(PCP) which is especially good for the transmission of high viscosity liquids containing solid grains has been wildly used in electronic packaging industry in recent years. Due to the existence of pipeline pressure, adequate hydraulic sealing pressure is necessitated to...

Combined rotor is the core part of gas turbine and works in high temperature and high rotating speed environment in a long-term,creep bending of the combined rotor will make great effects on the gas turbine’s performance. To study the creep bending properties of gas turbine’s combined rotor considering...

Machining is the main processing method of the steam turbine system. Due to its complex structure, numerous materials, and complex process, the massive types and quantity of cutting tools generated. The key to improve the machining efficiency and reduce the processing cost is adopting the advanced cutting...

Laser assisted milling (LAML) is a potential method for machining difficult-to-machine materials such as superalloys which uses a high power laser to focally heat a workpiece prior to material removal with a traditional cutting tool. A transient three-dimensional thermal model and cutting process model...

Defective rolling bearings generally provoke a demonstration of nonstationary and nonlinear properties. As a result, condition monitoring of a rolling bearing seems challenging due to difficulties in fault feature extraction. This study introduces statistical linguistic analysis (SLA) to investigate...

MAV (Micro air vehicle) has become the most extensive research field in academia and industry because of its strong maneuverability and the capability of VTOL (vertical take-off and landing). Vibration is a key factor affecting the long-term autonomous navigation of MAV, and the dominant source of MAV...

Haul truck transportation is one of the most important transportation methods in large surface mining operations. It is a key factor that affects the mining productivity and cost effective, however, its accidents rate and dangers are far higher than other types of developing transportation in the surface...

Because ordinary movement wheelchair has been unable to meet the needs of disabled sports personnel, it is necessary to research and develop multifunctional movement wheelchair. Analyzing the physical characteristics of disabled sports personnel, combining with the ideas of "human - machine - environment"...

Influence of fabrication errors on modal amplitude in a dual-mass silicon micro-gyroscope is present in this paper. Firstly, the structure and operation principle a dual-mass silicon micro-gyroscope is introduced. Then the equation of amplitude ratio between left and right proof mass is deduced. Finally,...

In order to optimize the structure of tank support system of tunnel continuous washer, the 3D model was established by Pro/E and was imported to HyperMesh, then finite element static analysis and topology optimization analysis have been carried out. The optimum results showed that the weight of tank...

With the mass production of cars and utilities, the incidence of car accidents is increasing, while the case of car accidents in a variety collision probability is highest. The theory of the explicit nonlinear finite element which is adopted in the crash simulation is expounded. According to the European...

One new conception avionics system of launch vehicle is proposed according to the future technology trend. Aimed at efficient, low-cost and reliable space transportation system, the entire avionics system scheme is proposed innovatively in this paper. There are some characteristics in the avionics system...

In micro/nano milling, the accuracy of tools in high-speed motion and the correspondingly final milled precision are greatly affected by the holder. Shrink-fit tool holders have high precision in principle to assure micro/nano milling since there is no medium between the holder and the cutter. Aiming...

Mechanical micromilling is the key technique for the fabrications of high quality miniaturized components with nano-level surface roughness by only one-time workpiece setup. Micromilling machine tool is the prerequisite for this technique. A three-axis desktop micromilling machine tool has been developed...

The separating principle of the cyclone separator has been analyzed by analyzing the tangential speed, the axial speed, and the pressure distribution of the flow field inside the cyclone separator. The dimensional parameters of the separator with larger effects on the separation efficiency of plastics...

The safety of the vehicle occupants in car-to-truck rear-end collisions is directly related to the crashworthiness of the car body. This paper mainly studied the effect of sensitive parameter named offset rate on car structural crashworthiness in rear-end accident. In order to provide a reference on...