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In this paper, the force analysis of the blade roller of the tiny cultivator is described firstly. The static analysis of the blade is carried out by using the Simulation plug of SolidWorks, and the data of von mises stress, resultant displacement, equivalent strain and safety factor of the blade are obtained. Then the modal analysis of the blade roller is carried out, and the data of the top ten...
In the operation of bulldozer, the working device bears various complex loads, which raise higher demands on the rationality of the structural design, the convenience of the operation, the durability and the reliability of the working device. The finite element method is used to analysis the structural strength and the fatigue life of the working device. The dangerous points, stress, strain distribution...
Seafloor massive sulfides (SMSs) are formed as precipitation products from hot hydrothermal fluids as a result of mixing with cold seawater and are mostly found at depths between 1500 and 3600 m. These deposits are formed in tectonically active zones of oceans (midocean ridges and “back-arc” spreading systems) and are the result of the global heat transfer from the mantle in the oceanic crust. As...
This paper present a blade vibration monitoring method based on strain gauges for a straight-bladed vertical axis wind turbine with pitch control. NACA0018 airfoil sinusoid-pitched at centroid was employed, and experimental study was conducted to investigate vibration characteristics of the pitching airfoil. The mechanical model of blade with simply supported was built, meanwhile the impacts of arrangement...
The mechanical part of the wind turbine is the part that makes direct contact with the wind and it is here that the kinetic energy of wind is converted to mechanical energy. So this part of turbines must respect some conditions, as such must: • Ensure maximum conversion of kinetic wind power to mechanical power; • Resist the maximum possible for different storms (rain, snow …); • Have a long life...
Husking of coconut is among the most-difficult post-harvest operations relevant to coconut. It involves much human drudgery. At present, the husking is generally done manually using either a machete or a crowbar. Much skill, training, and endurance are required in this. Attempts made so far in developing husking tools have been only partially successful and not very effective. Considering the drawbacks...
The main objective of this study is to obtain the reasonable range of offset in tube roll-cutting process by analyzing the effect of the process kinematics. For this aim, the roll-cutting processes are simulated. Due to the existence of the offset, the relative feed speed of blade is not constant. In this paper, the relationship between the radial feed speed shock of a blade relative to the tube and...
This paper obtains the distribution range of steam turbine blade's static response by non-probabilistic interval analysis method. To improve the strength reliability of blade, the uncertainty of the material properties, Geometry parameters, load, and speed of turbine blade must be considered. Based on the uncertain factors of influencing the static characteristics of the steam turbine blade, expressed...
Using different governing modes in the process of large steam turbine load variations will make the thermal characteristic and force of unit get complicated, especially affect the thermal characteristic and force change of the control stage notability the most. This article researched the governing mode problems of the domestic-type 600 MW steam turbine, analyzed different characteristics in different...
Slewing ring with negative clearance is used as blade bearing in wind turbine. Negative clearance dramatically increase contact forces between balls and raceways. Existing methods for calculating loads between raceway and balls in four contact-point slewing ring suppose that the raceways are rigid and only assume elastic deformations of rolling elements. Experiments show that negative clearance dramatically...
Take a domestically-made imported 600 MW subcritical steam turbine unit as an example to carry on the research on steam governing performance of the regulation valve, get the bending stress ratio of the 1st stage blades and turbine's imbalance steam force by calculating, and then confirm the operating safety of the unit under different steam governing arrangements. Through the analysis of the calculation...
With the continuous development of large-scale software, the theory of finite element, and computer speed, so the accuracy has been continuously improved for numerical analysis of finite element. The numerical analysis method of finite element has become increasingly widely used in dealing with practical engineering problems, the calculated model was established by elastic-plastic theory under taking...
Wind power is a promising green energy because of the energy crisis is grown up gradually. The first key factor to wind power is energy transfer efficiency and the reliability of the wind turbine system, if without efficiency, the power output just exhaust the energy, if without reliability, the wind turbine system is not only useless but danger to the surrender. This paper is use stress and dynamic...
The shrouded blades of integral shroud cascade impact test rig were taken as the research object, the 3D solid models and finite element models of single blade and grouped blades are respectively established in 3D design software SolidWorks and the finite element software ALGOR. By means of finite element calculation, the dynamic characteristics of shrouded single blade are explored. In this paper,...
This paper is to discuss the factors which contribute to the wafer backside chipping after sawing. The factors consider in this study are: Factor 1: Foil properties (adhesiveness and hardness) Factor 2: Saw blade properties (diamond grit size and concentration) Factor 3: Die size after sawing. The influences of these three factors have been discussed base on the study results. Result show that the...
Renewable energy generation strongly relies on wind power aside from water power plants. Technical and economical growth rules ("The larger, the better") yield systems of increasing power now far in the Megawatt range. Wind power rotor blades have to withstand high mechanical stress by standard and disturbed operation through centrifugal and power transmission forces. Especially, heavy wind...
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