Applied Mechanics and Materials Vols. 752-753

Abstract: In order to improve the vibration isolation performance of engine mount, a new type of magneto-rheological semi-active mount with multiple inertia tracks is designed based on the existing magneto-rheological semi-active mount . The mechanical model is established according to the mount. The expression of the dynamic stiffness and damping lag angle is deduced, then the dynamic characteristics is simulated in the simulation software. At the same time, verify this model correct by the experiments.

Abstract: The influence of dry friction damping on twin shaft model test rig vibration experimental investigation is presented. Experimental investigation method is devised and tested at the work. Dry and Coulomb friction damper is developed. The efficiency of damping is evaluated quantitatively via rotor shaft vibration displacements amplitude determining.

Abstract: In order to promote the quality of mixture and improve the fuel spray spatial distribution, enhancing airflow movement in a combustion chamber, a new swirl chamber combustion system in DI (direct injection) diesel engines is proposed based on conical-spray. Numerical simulations have been conducted by using the FIRE v2008 code. Several different widths of passage and spray angles are investigated in a single cylinder 135 diesel engine. The combustion and emissions performance were investigated by different conical-spray nozzles and combustion chambers with a constant compression ratio. The results show that using this combustion system, the mixture formation and combustion processes have been improved by a certain longitudinal swirl when the air is squished into the swirl chamber through the relative narrow passage. Moreover, the formation of homogeneous mixture is accelerated and the combustion is improved compared with that of conventional combustion system. The cases show the passage width of 5mm and conical spray cone angle of 140° has a better performance in the new combustion system.

Abstract: The summary of results obtained in experimental studies to convert oxygen into ozone is discussed. The dependence of oxygen and ozone fuel burning is observed and optimized. The ozonation structure system for a combustion engine (CE) is developed. Adaptive automation system strategy is devised. The prototype model of ozone-ventilating device for a combustion engine fuel system is developed. The system is installed in the combustion engine. The analysis of exhaust gas concentration is performed applying an ozonizer and without it.

Abstract: Harvesting energy from vibrations has received massive attention due to it being a renewable energy source that has a wide range of applications. Over the years of development, there is always research to further improve and optimise piezoelectric energy harvesters. This paper presents work on improving piezoelectric energy harvesters based on the structural modifications. Four different strategies of structural modification are employed for optimization by using additional beam structure as well as incorporation of rubber layer. This work summarized the optimum performance of the strategies at a resonance frequency of 60 + 2 Hz at 0.25g. The parameters compared among the strategies are voltage, power, PZT power density, spatial power density and specific power density. The results are also compared with other similar work. In general, structure with an addition of silicon rubber beam was found to give the best power density output and produce 253% increase of power ouput as compared to basic PZT energy harvester.

Abstract: This paper describes a method developed by the authors for the detection and estimation of knock intensity in the cylinders of internal combustion engines. The method is based on the spectral analysis of the ion current signal, which is detected within the combustion chamber of the engine. The method allows estimation of the total wave packet energy for different waves speed and frequency. The estimation results of wave’s energy arising in the normal and knock combustion to engine VAZ 2110 are also presented in the paper work.

Abstract: In this study, a hot gas is used for heating the cavity surface of a mold. Different stamp thickness were designed and insert into the cavity plate. The stamp surface temperature was heated to above the glass transition temperature of the common plastic material. The heating result show that cavity surface can be heated to 196 °C after 20 s. The highest temperature appears at the center stamp surface. The stamp thickness strongly affects the heating speed and heating uniformity. When the stamp thickness is 0.5 mm the fastest heating rate can be reached with the value of 8.3 ^oC/s. With the thicker stamp, the slower heating rate could be reached.

Abstract: The robust control system objects with interval-undermined parameters is considers in this paper. Initial information about the system is its characteristic polynomial with interval coefficients. On the basis of coefficient estimations of quality indices and criterion of the maximum stability degree, the methods of synthesis of a robust regulator parametric is developed.

Abstract: In this paper is intended to study and develop embedded systems for use in controlling the operation of the Unmanned Aerial Vehicle (UVA) to work effectively under automatic control system. As well as to design flight control 4 blades, which uses an ATmega328 microcontroller controls the four motors and fly under equilibrium conditions. The embedded system is defined boundary conditions for UAV to suit the operation of the UAV. The Wi-Fi signal is used to transmit data in order to bring the instruction set processor to control the operation of UAV and displayed to the user immediately. Operation of the UAV based on the conditions that were set by the user to suit the scope of work that user need. Nowadays, high technology machines and robots for use in agriculture is very much in some areas. In order to reduce the work of human and still operates efficiently as well. Thus was born the idea to put apply including embedded systems and robotics in order to be used in agriculture to function effectively. Appropriate to the environment and work under human control.

Abstract: The paper propose to use robust control algorithm with disturbance compensation for management anthropomorphic robot PUMA type so as to ensure the movement of the robot manipulator along a predetermined path with a given accuracy. Necessary to generate a control signal for each degree of mobility without the use of velocities and accelerations of its relative coordinates measured output variables or other degrees of freedom. Thus, decentralized control is implemented to overcome the handling robot. For the formation of the control actions using the auxiliary circuit. This approach allows compensating for structural and parametric perturbations of the control object.