Proceedings of 2011 International Conference on Fluid Power and Mechatronics

According to the body structure characteristics of transporter for large-scale wind turbine blade and the deficiency of traditional steering system, a new trailer steering system was designed. The mathematical model of steering system was established, then it was optimized by MATLAB optimization toolbox. The application of the optimized system improves the steer performance. The design and optimiz... View full abstract»

Based on the principle of the planetary transmission mechanism, we design a friction drive planetary roller-type precision linear actuator. Using the kinematic analysis, a displacement function of the linear actuator and a cutter path equation for thrust bush manufacturing are obtained. Deformations of the thrust bush under several load conditions are analyzed using the finite element method. Expe... View full abstract»

This paper constructs the three-dimensional mathematical model of the internal flow field of the fixed damping orifice by using computational fluid software. It simulates the internal flow of the fixed damping orifice by adopting the standard k-ε turbulence model, and analyzes the influence of the fixed damping orifice's parameters on such fluid flow characteristics, as the velocity, the pr... View full abstract»

Air nozzles are the key constructional elements of the lithium battery films drying cabinets and have a great effect on drying efficiency and effectiveness even the running of whole drying system. The steady state flow fields of three kinds of air nozzles are obtained through numerical simulation method. This paper provides an investigation of the resistance characteristics and flow equalization c... View full abstract»

In the work, a suboptimal controller is proposed for an electro-hydraulic system. The controller design bases on a recent genetic algorithm. The genetic algorithm can select the weighting matrices with respect to the suboptimal control scheme. In addition, in order to improve robust performance of the electro-hydraulic system, parameter uncertainties are considered in the process of genetic search... View full abstract»

Recent studies identified compressed air systems as one of the major consumers of electrical energy in the transnational system. As the importance of compressed air energy efficiency grows for companies and government regulators, so does the need for theoretical analysis. Currently, the modelling process of pneumatic infrastructure focuses on the detailed mathematical description of pneumatic driv... View full abstract»

A series of wind tunnel tests were conducted on the vibration and scattering behavior of full-size models of tiles widely used as roofing materials on Japanese wooden dwellings. This study has investigated the nature and source of such movement with the aim of providing better insight into the mechanism. The roofing tiles were set up on a pitched roof in the downstream flow from a wind tunnel. Vib... View full abstract»

This paper describes a water leak test of roof tiles. The 100 roof tiles were set up on 10 lines and 10 rows on the pitched roof in the downstream of the flow from the wind tunnel. The flow velocity was increased gradually from the low velocity to the high velocity, and the effects of the wind on the roof tiles were investigated by the water leak test. The situation of the water leak test was film... View full abstract»

Aiming at problem of force condition of vane in high pressure vane pump, through analyzing hydraulic pressure forces, motion inertia forces and contacting reaction forces which were exerted by stator and rotor in vane, dynamic model of force in inlet area was built. Contacting reaction forces were solved at two cases of considering vane's shape, thickness and didn't, a series of variation curves o... View full abstract»

The noise level and flow ripple are important parameters indicating the performance of high-pressure vane pump. This research aims at the influence of silencing grooves configuration on flow ripple and the fluid noise which mainly generate by pressure impact within the transition region in high-pressure vane pump. The pressure gradient was adopted to measure the rate of pressure impact, and the ma... View full abstract»

This paper presents an On-line Identification based Optimal Control (OIOC) method that composed of two layers: the control layer is used to realize the close-loop control while the optimization layer is used to search the optimal control parameters. This control strategy can ensure the robustness of a servo system. The nonlinear PID controller, Elman network based identifier and Particle Swarm Opt... View full abstract»

This paper is concerned with the design of a FPGA-based digital proportional-integral-derivative (PID) controller for synchronization of a continuous chaotic model. By using the EP algorithm, optimal control gains in PID controlled chaotic systems are derived such that a performance index of integrated absolute error (IAE) is as minimal as possible. To verify the system performance, basic electron... View full abstract»

The wind turbine blade sustains wind loadings during the operation and parking states. Due to the increasing size of the wind turbine blade, it is important to utilize the composite materials in a sufficient way to reach the material strength. Most of the composite blades are made of glass fibers composites while carbon fibers are also employed in recent years. Composite materials have the advanta... View full abstract»

To extend cable-stayed utility longevity and reduce the frequency of vortex-induced vibration. Firstly, this paper designs a new-style cross-section shape of the stay-cables' casing with the help of aerodynamics. Secondly, it establishes its expression making use of CFD, afterward, it compares the new model with existing and gets the new modle can avoid coming into being significantly vibration. I... View full abstract»

To drive hydraulic cylinder directly by hydraulic pump closed-loop represents a hot research area in the field of electro-hydraulic control technology today, and is the most direct means to improve the energy efficiency of electro-hydraulic control system. So far, this technology has been well applied to the pump-controlled symmetric hydraulic cylinder. But for the differential cylinder that widel... View full abstract»

Oil source made up of constant pressure variable displacement pump, accumulator, and pipeline is widely used to provide stable pressure for electro-hydraulic control system in practical engineering. Based on the experiment, the relationship between pressure & volume of the accumulator at inlet of the valve and control precision is analyzed in detail, and coupling rules between the load variati... View full abstract»

This paper studies on improving the bandwidth of electro-hydraulic rotary actuator. Electro-hydraulic servo system is a typical nonlinear system, and also usually disturbed by internal and external uncertain factors. The nonlinear and uncertainty characteristics make the conventional controller not yield to the system high bandwidth requirement. In this paper, an adaptive robust controller based o... View full abstract»

To improve the identification precision of flow-rate characteristics of pneumatic solenoid valves, a new algorithm called Cbm algorithm is proposed. The error formation mechanism of current algorithm defined by the ISO6358/DIS-3 is analyzed. The Cbm algorithm has reduced the errors of pressure derivative by changing the calculation procedure of multivariable optimization. Five pneumatic solenoid v... View full abstract»

Aiming at the problems of vibration on hydraulic pipe in aircraft, using math modeling and simulation is a quite efficient and effective method in theory. In this paper, the 14-equation Fluid-Structure Interaction (FSI) with influence of viscous friction is established for modeling the pipe and fluid. By using the Transfer Matrix Method (TMM), the components and pipelines are connected to get the ... View full abstract»

In situations where the vibration sensor is not suitable to be used and while fault diagnosis method based on vibration signal processing has limitations, KPCA fault diagnosis method based on sound signal is proposed. The basic theory of kernel principal component analysis and its basic procedures for fault detection are introduced and sound signal pre-processing is depicted, multi-domain feature ... View full abstract»

It is critical in fault diagnosis to extract the feature vector of fault signal effectively and to find the sensitive factors. Therefore, a series of vibration signals are collected at pump end cover under some faults, such as loose sliding shoe, sliding shoe wear, sloping cam plate wear plate and the center spring failure, etc. Then, low frequency signals are obtained by means of suitable signal ... View full abstract»

In order to overcome the characteristics of uncertainty and incomplete information of fault attribute in searching for fault, a new fault search method based on the fault tree and grey fuzzy multi-attribute decision-making is proposed in this paper. Firstly, utilizing fault tree analysis (FTA) method to determine the initial fault alternative, fault probability and search cost of the fault alterna... View full abstract»

Hydraulic screwdown system of cold strip mill is nonlinear, time-variant system and it is disturbed by many factors, so the turning quality of controller influences the accuracy of Automatic Gauge Control (AGC). In this paper an optimum design method based on particle swarm optimization (PSO) algorithm is presented for PID controller parameters optimization of hydraulic servo screwdown system of o... View full abstract»