[en] In the paper, the structure, working principle, functions and characteristics of an data acquisition and analysis system for internal combustion engines (I.C. engine) based on DSP is introduced. The DSP can not only acquire and analyze the data alone, also can work with the PC together to form data acquisition and analysis system with high speed and large memory. The system takes advantages of TMS320F2812's plenty of peripherals on chip, becomes small and easy for installation. USB technique is used to translate data between DSP and PC in high speed, so the system's real time processing is proved very much. It is proved that the designed system can acquire and analyze the steady and transient parameters of the I.C. engine very well

[en] The kinematic plan of the double flow transmission and the steering mechanism for the twin engines tracked vehicle is proposed. It could be used for the compact remotely operated vehicle or autonomous tracked chassis with twin electric engines. However, the plan is applied for skid steering wheeled vehicles or heavy transport vehicles. This plan makes it possible to use the parallel/series type hybrid propulsion system. In this case the powertrain is divided into two separate flows: heat engine with a gearbox and the reversible traction electric engine. The principle could be adapted for designing ships with diesel-electric hybrid propulsion system (it is possible to use internal combustion engine instead of electric engine), for the reduction unit modernization in the motor boat, and for special purpose ships design. Simplicity, portability, engine duplication, potential for energy recuperation during breaking/turning and providing turning around the center of gravity are the main advantages of this plan. The last two points are true for skid steering wheeled vehicles. The operating modes, the main kinematic and power aspects are provided. The required power of the electric engine traction in the hybrid transport tracked vehicle (weighing 45-50 tons) is estimated. The production of the hybrid propulsion system with proposed transmission based on Russian components is considered. (paper)

[en] Some general features of a new class of thermodynamic device combining a thermodynamic cycle with the externally applied steady flow of an open thermodynamic process are discussed and experimentally demonstrated in the context of a thermoacoustic refrigerator. copyright 1998 The American Physical Society

[en] It is shown that in theories of gravity where the cosmological constant is considered a thermodynamic variable, it is natural to use black holes as heat engines. Two examples are presented in detail using AdS charged black holes as the working substance. We notice that for static black holes, the maximally efficient traditional Carnot engine is also a Stirling engine. The case of negative cosmological constant supplies a natural realization of these engines in terms of the field theory description of the fluids to which they are holographically dual. We first propose a precise picture of how the traditional thermodynamic dictionary of holography is extended when the cosmological constant is dynamical and then conjecture that the engine cycles can be performed by using renormalization group flow. We speculate about the existence of a natural dual field theory counterpart to the gravitational thermodynamic volume. (paper)

[en] Highlights: ► A vibration analysis of an internal combustion engine was carried out. ► Sound intensity and surface vibration velocity measurements have been employed. ► The radiation factor of the engine vibrating surfaces was determined. ► The radiation factor can be applied for diagnostic scopes. -- Abstract: The present work deals with the problem of monitoring and diagnosis, through non-intrusive methodologies, of stationary internal combustion engine, with particular attention to the cogenerative 1 MW unit installed at the Engineering Faculty of the University of Perugia. Specifically, acoustic and vibrational measurements have been performed to correlate the engine functional status (and therefore the vibration of mechanical surfaces) with the acoustic emissions features through the characteristic radiation factor. The ISO/TS 7849 normative for the correlation of vibration and acoustic measurement has been employed.

[en] An engine coolant pre-heater is adopted to raise the temperature of a coolant for the proper operation of the engine at a harsh environment. We evaluate the performance of a pre-heater operating at a specified condition using LMTD and ε-NTU methods, and select critical design variables for optimization. The reference pre-heater model is a simple cross-flow heat-exchanger with a single path for both coolant and heating water. The results indicate that the pre-heater exhibits better performance than the reference model when it has four paths for the coolant and two paths for the heating water. The final model for optimization has a volume 45% smaller than the maximum size allowed while satisfying given design requirements

[en] Short communication

[en] Short communication

[en] In this article, a chronological analysis of the technologies and events that any way influenced in the evolution of the internal combustion engine is done everything it through the observation of the works carried out for scientific empiric and engineers whose technical and conceptual value meant the motivation of other people for the search of a better development in this engineering field

[en] We analyse the two-dimensional motions of the rockets for various types of rocket thrusts, the air friction and the gravitation by using a suitable representation of the rocket equation and the numerical calculation. The slope shapes of the rocket trajectories are discussed for the three types of rocket engines. Unlike the projectile motions, the descending parts of the trajectories tend to be gentler and straighter slopes than the ascending parts for relatively large launching angles due to the non-vanishing thrusts. We discuss the ranges, the maximum altitudes and the engine performances of the rockets. It seems that the exponential fuel exhaustion can be the most potent engine for the longest and highest flights