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A new theory of gearing: high order contact meshing theory of gearing is presented in this paper. We believe that this kind of gear profile is most suitable in both the contact and bending fatigue strength. From careful analysis and deep going investigation, we think that it is the profile of equal conjugate curvature with high order of contact, and analyzed the forming principle of this kind of profile...
In this paper, SOBI blind source separation algorithm is applying to extract the fault feature of gearbox vibration signal. It is Tested and verified by BP neural network for fault diagnosis. The result shows that the fault feature extraction method based on blind source separation for gearbox fault diagnosis is very effective.
Geometry model, as a mapping on physical space to calculating space, is a foundation of numerical simulating. Aiming at a complicated object, reverse engineering technology was applied to model cylinder head. Using Pro/Engineering modeling software, inlet port, outlet port, up water jacket and bottom water jacket geometry bodies were modeled one by one. Finally, by Boolean calculation, a cylinder...
On an electronic control common rail diesel engine, simulating and experimental studies were carried out at rating working condition and 80% output power working condition, by adjusting heat transfer conditions on fire deck to investigate the effects of thermal load on cylinder head. Results showed that, with the output power increasing, the thermal load acting on cylinder head became increasing....
Considering center distance and gear facewidth, establishing the optimized objective function and constraint equation of properties, while optimizing the data by utilizing the Matlab optimization tool box, it is discovered that, through analysis of the outcomes compared with the original design data, the optimized objective value has reduced by 24.77%, and the centre distance by 15%, in contrast to...
High speed forklift not only has the engineering working ability as an ordinary forklift, but also comes up to the running speed of 80km/h on highroad with the preferable cross-country performance, so it has received more and more attention in the field of mechanical engineering recently. In this paper, based on the test of vehicle's ride comfort, moment of inertia of body for high speed forklift...
In the large-scale wind turbine designed, a large proportion of work occupy in the blade design, but because of three-dimensional blades model design difficult to achieve, and through the reverse way to reconstruct spending is large and modifying accordingly, which limit the statics, fatigue and other follow-up analysis about virtual prototype greatly. To this end, by studying the leaf design theory...
This paper describes a mechanical part similarity assessment algorithm based on shape distribution, which represents a 3D shape as a D2 shape histograms. First, generating a large number of random sample points from a model. Next, we adopt the D2 shape function to compute the distance of any two random points and construct a shape distribution curve by having a statistic of the distance values. Last,...
A online rolling bearing fault diagnosis system is designed using TI Company's digital signal processor DSP-TMS320F2812 as the core processor. The hardware is built by the various peripheral modules of F2812, which includes the acquisition of vibration signal, rotating-speed signal, digital signal, and communicates with the upper monitor by RS-232 protocol and TCP/IP protocol. According to the common...
In this paper, a particle-based simulation method for the immiscible liquid-liquid interaction is proposed. Through establishing an interfacial tension model for multiple liquids and using the essential method of the Smoothed Particle Hydrodynamics, the immiscible effects in the interaction simulation for multiple liquids can be embodied realistically. The experimental results verify the validity...
In order to have fault diagnosis for centrifugal compressor correctly, the times series analysis with neural network was carried out for it. The theory model of time series analysis method was put forward firstly, and the autoregressive coefficients diagnosis method was discussed then. And the neural network diagnosis method with AR coefficients was put forward at last. And the fault diagnosis results...
Expert system development environment directly affects the efficiency and quality of development of expert system. According to modular machine tool spindle box's design complexity and design goals of multiple solutions, it identifies modular machine tool spindle box expert system platform is the Pro/Engineer. Its development tools are Visual C++6.0 and Pro/Toolkit, its database management system...
Considering the nonlinear effects of tyre on the vehicle model, Pacejka tyre model was adopted to set up the 3-D nonlinear dynamic model of four-wheel steering vehicle. Simulations were carried out on the 3-D nonlinear dynamic model for a step input. The simulation results show the advantages of four-wheel steering vehicle. Compared with front wheel steering vehicle, the four-wheel steering vehicle...
The three-dimensional finite element (FE) model of the radial tire was built in the software of MARC. In the FE model of tire, the complexities of material and structure, the friction between the tire and the ground, are fully taken into account. Different rolling conditions were simulated under the standard pressure and rated load. The friction stress distribution characteristics of the tire surface...
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