Applied Mechanics and Materials Vol. 376

Abstract: Now, plunge shaving process is becoming a common method in gearing manufacture. Serration design and parameters adjustment for shaving cutter require considerable experiences and time. By combining Visual Basic and Solidworks API, this study proposes a new method to quickly simulate the shaving process and get final work gear profile easily.

Abstract: A Multi Input Multi Output (MIMO) fuzzy estimator variable structure control (VSC) which containing an on-line controller coefficient tuned with the aim of a fuzzy back stepping algorithm. Satisfactory trajectories tracking among the internal combustion engine (IC engine) air to fuel ratio and the preferred input is certified in this paper. The fuzzy controller deployed in developed fuzzy estimator variable structure controller works using Lyapunov fuzzy inference system (FIS) with least model based rule base. Function among variable structure function, error and the error’s rate is represented by model. The outputs show fuel ratio. The fuzzy back stepping tactic is an on-line variable structure function fixing with the aim of an adaptive approach. MIMO fuzzy estimator and VSC performance with an on-line fuzzy back stepping algorithm (FBAFVSC) tuned with the aim of controller coefficient is confirmed using a comparison with VSC and planned approach. Simulation outputs indicate excellent presentation of fuel ratio in attendance of ambiguity and exterior annoyance.

Abstract: The dynamic assembled screw-driven device is a new kind of mechanical driving device, one of its main structures is the reasonable designed motionlink. To setup two groups of oriented wheels which complied the Archimedes screw around the center cylinder, the top groups of wheels ensure the helical plates moving in the right direction otherwise be twisted, and the other groups of wheels provide the power that ensure the helical plates meshed accurately and driving stably. This paper is to calculate the structure in theory and make some primary simulation analysis for the mechanical characteristic in Static.

Abstract: On the basis of multi-axle vehicle 3-DOF dynamic model, and using leaning stiffness of each wheel and external disturbance as uncertainty parameters, variable structure control theory was used to make the actual variable model track the optimal theoretical model primely. The results of the simulation indicate that this method is feasible, and the impact to the system stability from parameters perturbation and external disturbance could be overcome by this control system.

Abstract: The uniform cooling of Main vessel in prototype fast breeder reactor to ensure its integrity at all operating conditions is achieved by Spillway weir as non uniform cooling of vessel leads to radioactivity problems. Liquid sodium at 670K is used to cool the main vessel. Sodium is divided as hot pool (820K) and cold pool (670K) by inner vessel. The temperature difference between hot and cold pools is 150K. The main vessel is just 300mm distance from the inner vessel for a height of 4m. Due to this small gap and very less temperature difference between the hot and cold pool the main vessel temperature increases close to that of hot pool (820K). The main vessel is made up of SS-316, for which the creep region is 753K. Hence the uniform cooling of main vessel is essential by sodium leaking from subassemblies. The objective of the paper is to describe how the spillway weir system is used to achieve uniform cooling of main vessel and also to avoid flow separation as it leads to large scale entrainment of argon cover gas and also to avoid thermal asymmetry in main vessel and gas entrainment phenomenon as high impact velocity of falling sodium would cause large scale argon gas entrainment. Considering the Froude Number between the model and prototype, sodium is simulated by water and argon is simulated by air.

Abstract: An accurate three-dimensional flow passage model of the compressor has been created; the stress distribution of the main flow channel has been obtained. The aerodynamic force was applied to the impeller blades. Three kinds of loads were applied to the main blades and splitter blades. Modal characteristics of the compressor blades have been intensively studied.

Abstract: The piezoelectric materials have the positive and inverse piezoelectric effects. The piezoelectric elements can be served as actuators and sensors. The piezoelectric elements are adopted to control the vibration of autobody thin-wall structure. The proportional control, proportional-derivative control and independent modal space control based on LQR (Linear Quadratic Regulator) are simulated by using finite element method. The piezoelectric patched autobody thin-wall structure is simplified to a square plate with peripheral clamped boundary. The finite element model is established. The central node displacement is monitored as a control variable in these control methods. Central patched plate and surrounding patched plate are analyzed under the three control methods. The effectiveness of vibration control is obtained. Compared with proportional control, the proportional-derivative control has advantage of oscillation suppression at the beginning vibration control and has more obvious vibration control effectiveness. Compared with the above two control methods, the independent modal space control based on LQR has a better stability and vibration suppression effectiveness.

Abstract: Three-axis NC milling machines must carefully consider the surface interpolation algorithm and the cutting tool compensation method to achieve precise NURBS surface machining results. This study thus analyzed NURBS surface functions and developed a tool compensation method to efficiently compensate for the radius and length offsets of the cutting tool used for NURBS surface machining. A NURBS surface machining test performed on a vertical machining center further validates the proposed approaches.

Abstract: Gearing is one of the most critical components in mechanical power transmission systems.. This paper explains about the comparison of the geometry of Helical gears for two different modules by modeling and mathematical equations, load distribution at various positions of the contact line and the stress analysis of Helical gears using three-dimensional finite element method. The bending stresses were examined using three-dimensional finite element model.. These stresses of different modules obtained from the finite element analysis were compared and the considerable reduction of weight occurred was found and also the values are compared with the theoretical values. Both results agree very well. This indicates that the finite element method model is accurate.

Abstract: This paper deals with designing a MEMS cantilever which can function as biosensor for tuberculosis detection. In this study we investigate the MEMS based biosensor to detect Tuberculosis based on capacitive sensing, peizoresistive and resonant frequency methods. We also examine which method has enhanced performance. Early detection and treatment of diseases can facilitated only if we are able to detect pathogenic and physiologically relevant molecules in the body with high sensitivity and specificity.Early detection of diseases reduce the risk of patients being pushed to advanced stages of many diseases.This sensor is used for early detection of Tuberculosis using the antigen antibody reaction.Tuberculosis can be detected by monitoring the presence of disease causing antigen in the blood stream.The presence of disease causing antigen in the blood can be monitered by using this microcantilever based diagnostic device. The sensing principle varies according to the device, the nature of the analyte molecules, and the precision required. Capacitance, piezoresistance and resonance frequency are among the read out methods depending upon the mechanical properties of the device. The biosensor structure is designed and simulated using Coventorware, Intellisuit and HFSS software. This microcantilever based biosensor can detect tuberculosis by immobilizing specific antibodies on the microcantilever.These antibodies are specific to TB antigen 85 complex.When the patient sample containing TB antigen 85 complex is placed on the cantilever biomolecular interactions take place between TB antigens and the antibodies immobilized on the upper surface of the microcantilever.This causes microcantilever to bend and facilitates to detect the presence of Tuberculosis.Bending of the cantilever can be measured by capacitive sensing, peizoresistive and resonant frequency shift methods.