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In this paper, a fatigue life model of aeronautic rolling bearing made by M50NiL steel was established with Goodman formula and material P-S-N curves, based on Lundberg -- Palmgren fatigue life theory (L-P theory) and Hertz contact theory, considered the effect of thermo-mechanical coupling. The model was mostly related to the maximum Hertz contact stress and material coefficients. To solve the stress...
Contrast enhancement plays an important role in image processing system, which is used to improve image quality or extract the fine details in degraded images. Image enhancement was regarded as an optimization problem and a kind of hybrid intelligent algorithm was proposed in this paper to optimize parameters of image enhancement operator who took the advantage of local gray distribution and the global...
Because of large amounts of heat generation, rolling bearings of heavy load and high speed can have a severe effect on the temperature field of the whole transmission system. Meanwhile, the excessive deformation caused by high temperature can badly affect the bearings' working reliability and lifetime. With the theory of friction and thermal conduction, heat flux and heat transfer coefficient for...
Previous research revealed that gear tooth failure is close related with tooth surface and bulk temperature. In this paper, the bulk temperature of high-speed gear tooth is analyzed using finite element method. The analytical approach and procedure for estimating frictional heat flux and heat transfer coefficients of gear teeth in high-speed operational conditions is developed and accounts for the...
Because of large amounts of heat generation, spur gear transmission of heavy load and high speed can not only have a serious effect on the temperature field of the whole transmission system, but also lead to thermal deformation, which can badly affect the working reliability and the lifetime. With the complex application of gear meshing, friction and thermal conduction, heat flux and heat transfer...
The method of designing and calculating the optimum oil-supply pressure for jet-lubricated high speed aviation spur gears applied in helicopter transmission is analysed. The optimum oil nozzle arrangement and oil jet velocity are obtained based on related theoretical and experimental research results. A thick-walled orifice is taken as the model of the oil nozzle to derive the oil-supply pressure...
Chassis is one of the key components of tracked test vehicle. The strength and rigidity of chassis must be considered and structure resonance should be avoided during the process of structure design. The stress nephogram and strain nephogram of chassis are obtained, after static analysis in the finite element analysis software ANSYS. The maximum stress is 65.13MPa and the maximum strain is 0.00032mm...
A motion simulator of deep-sea mining ship is designed for the 6000m deep-sea poly-metallic mining system, the control methods and the performance of the simulator are researched and tested. PID control is chosen. To determine PID control parameters, mathematical model of valve controlled cylinder system is established and validated by simulation tests. Based on the mathematical model, PID control...
The impact between track and wheels of an amphibious armored vehicle in operation is the important reason of fatigue failure, and it will be the most complex in the steering condition. A dynamic model of an amphibious armored vehicle was established based on the ATV module of the ADAMS software. Simulations in the steering condition were carried out according to several typical arrangements of the...
For the purpose of simulation of the deployment and retrieval of deep sea mining system, two methods for assessing the added mass of components of deep sea mining system are mainly proposed in this work. The first method is referred to as the Hess-Smith method which is based on surface panel method and potential theory, the surface of the moving object is discretized to lots of panels to approximate...
The tracked nodule collector for sea floor mining is one of the key technologies for a deep-sea polymetallic nodule mining system, this paper builds a simulation model of walking hydraulic system for a tracked nodule collector on the basis of AMESim platform, a closed loop control system is constituted in the paper according to the negative feedback of the hydraulic motor angular velocity, a stimulation...
In recent years, much research has been carried out in the design of active and semi-active suspensions of vehicles for better vehicle response. In order to investigate the effectiveness not only in riding comfort but also in road handling, a half-car model with the hydro-pneumatic active suspension system is proposed in this study. Whole preview control method and partial preview control method,...
Negative selection algorithm is a prosing method in anomaly detection. How to improve complexity of the detector generation and speedup the detection efficiency is an open issue. The paper put forward an improved negative selection algorithm based on bloom filter. It reduced the overhead of detector generation and significantly cut down the matching scale. The related experiments proved the effectiveness...
Damaged cottonseeds has a disadvantageous influence on cotton yields. The traditional detection of cottonseeds depends on just labor, which is tedious and variant with different operator. An automatic detection system based on machine vision was designed to distinguish the sound cottonseeds from the damaged ones. The objective of this study is to develop image processing algorithms to finish picking...
The 300MN hydraulic die press is our country national defense and the infrastructure essential equipment, it is equipped with the synchronism-balancing control system, it is very important in improving the process precision of the product, ameliorating the force standing state of the die forging press frame, and extending the life of the die forging press body and the moulds. In this paper, through...
The moving beam of large-scale water press's position holding precisely plays a great important role in works piece quality. Firstly a precisely synchronism control system is studied, then the factors which result in the decline of the synchronism control precision are analyzed, finally a new control strategy based on structure invariance is afforded.
In recent years, much research has been carried out in the design of active and semi-active suspensions of vehicles for better vehicle response. In order to investigate the effectiveness not only in riding comfort but also in road handling, a half-car model with the hydro-pneumatic active suspension system is proposed in this study. Whole preview control method and partial preview control method ,...
In the present paper, a typical seafloor mining tool (SMT) is demonstrated. With considering the influence of ocean currents and ocean wave, the force analysis is carried out to SMT. There are five forces that effect SMT, they are as following: gravity, buoyancy, hydraulic drag force, tension of the riser and added mass forces. The results of force analysis strongly suggest that the added mass forces...
A systematic analysis was carried out on the relation curve of hydrocarbon transformation ratio vs. buried depth and that of vitrinite reflectance (Ro) vs. buried depth in Binbei area, major source rock area (Qijia-Gulong Sag and Sanzhao Sag), and major source rock layer (Cretaceous Qing-1 Member, Qing-2 – Qing-3 Members) in Songliao Basin, to re-determine the oil generation threshold depth of the...
Moving beam of the 300 MN large scale water press is properly damage the poles by bigger deflection angle which is brought by changing eccentric load during the time that the driving system is discharging. Eccentric load can be indirectly measured by pressure sensor because center of forging blank deforming drag change little, consequently moving beam position holding system can be discharged simultaneously...
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