Applied Mechanics and Materials Vols. 427-429

Abstract: Based on the disadvantages of the original LMD algorithm in terms of smoothing method and end effect, this paper puts forward to a method of diagnosis of rotor system faults based on the improved LMD and singular value decomposition. The PF component obtained after applying the improved LMD method is able to separate the aliasing modes while maintaining the natures and features of the original PF component. Thus, the systems real information can be grasped more effectively. According to the experimental analysis, this method can be applied to diagnosis of rotor system faults effectively.

Abstract: An investigation of flow in valveless micropumps is presented. Numerical simulations are done using ANSYS. It is found that both laminar flow and turbulence phenomena would occurs in the diffuser/nozzle element. And SST (shear stress transport) turbulence model is chosen to be the most appropriate turbulence model,The simulations show when the opening angel gets bigger, the flow in the micropump, especially in the diffuser/nozzle becomes unsteady. When separation flow of fluid appears, pressure loss coefficient decreases rapidly.

Abstract: To control the lateral acceleration of driving vehicle and its rate of growth is always an important part in road geometric design. At present, vehicles are simplified as single rigid body when and are calculated, moreover, the calculation is made in two-dimensional plane, which does not comply with the actuality. In this article, Road-Driver-Vehicle simulation system (RDVS) is applied to get and of driving vehicle on 3 test roads selected from the mountainous area of southwestern China. In RDVS, the dynamic vehicle model is driven on three-dimensional roads under the control of driver model, so it is more close to the real driving. The results show: got from RDVS is bigger than that from single rigid body calculation. As RDVS is more reliable, from single rigid body calculation may cause an insufficient estimation: suppose the driver drives at the designed speed, though the designed speed varies, the peak value of of the three objects range in [2.0m/s², 2.5m/s²], beyond the limit of comfort but within tolerable scope; as for subject C without application of clothoid, will exceed the limit of 1.0m/s³. So it is suggested using clothoid, considering improving the quality.

Abstract: This paper mainly introduces the strength curve of Yunnan regional standard for Technical specification for testing Compressive Strength of Masonry Mortar by Penetration Resistance Method. Furthermore, it researches the distinction in applicability and the accuracy between Yunnan regional and the national specification.

Abstract: A fluidlastic damper is a kind of novel lead-lag damper for a helicopter rotor, which possesses of stable dynamic properties but strong nonlinear performance. We have proposed dynamic equation of the rotor/fluidlastic damper coupling system to study the influence of fluidlastic damper dynamic characteristics on the helicopter rotor and calculated the response of the coupling system. The equivalent damping of the fluidlastic damper is identified from the response by decaying envelope-curves method, whose value is well consistent with that calculated by complex modulus method. Furthermore, the response of the coupling system with linear equivalent damping is found similar to that with nonlinear damping. Therefore, our linear model can basically reflect the dynamic properties of fluidlastic damper, promising the application of the equivalent damping of fluidlastic damper in predigesting aerodynamic stability calculation of the rotor/fluidlastic damper coupling system.

Abstract: Decreases the broken tire rubber block granularity can shorten tire flour milling process. Cutting the tire rubber block size control during processing method can be changed to achieve. Method by previously cut on the tire tread and an annular notch cut layered tread colloid. Tire crushing process down into tire tread and colloidal cutting kerf. Slitting and cutting the tire during the tire clamped in a fixed state. Maintaining the tire tread and the position of the cutting tool is parallel. Feeding the tool or tire in-process control of the tool infeed depth and speed of rotation of the tire. Cutting the tread rubber on the circular incision is to control the cutting of the plastic dispersion block. Achieve tread colloidal particle size control cutting. Colloidal tread cutting circular incision and control the cutting tool feed rate is achieved rubber block granularity control methods.

Abstract: Renewable energy recourses and Wind Power Generators are playing an ever-increasing role in power generation. In this paper, a two stage scenario-based approach considering load/wind forecast uncertainty is implemented for multi-objective economic emission dispatch problem which concludes minimize total fuel cost and emission simultaneously. Besides, an improved optimization algorithm of multi-objective based on Particle Swarm Optimization (MOIPSO) is implemented to extract the best solution for the stochastic problem. The proposed method is tested on a power system having 6-unit in order to measure its efficiency and feasibility.

Abstract: Co-optimization of output and reserve is necessary in order to provide maximum benefit to both consumers and producers. Once renewable generation sources like wind or solar begin to make up a large proportion of the generation mix, this co-optimization becomes much more difficult since the output of renewable sources is not well-known in advance. In this paper, a uniform reliability level is used as a constraint in the process of output and reserve. The proposed model is tested on the modified 5-bus PJM system. The co-optimization is performed by sequential quadratic programming techniques. The results show that the co-optimization results are strongly related to the uncertainties of wind power, the reliability level of the system, and the reliability of generators when wind makes up a significant portion of the generation mix.

Abstract: Based on the theory of Bernoulli-Euler beam and d Alembert principle, the differential equation of a cantilever column with a tip mass subjected to a subtangential follower force is built, the solution of the differential equation under the specific boundary conditions is found, frequency equation is formed for computing the system frequencies, several cases of this system is investigated.

Abstract: Through access to information obtained by the probability of the basic event to occur as the known data, using the structure function method of the diagram analysis and fault tree calculation method, calculated the probability about the sound level decline of car electronic horn, then known reliability and tested the sound level aspects of the car electronic horn is the stable and reliable, found out the main reasons of the sound level decline at the same time, proposed the prevention and improvement measures, improved the reliability of the car electric horn in sound level by the implementing measures.