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  • Other Sources  (858)
  • MECHANICAL ENGINEERING  (858)
  • 1980-1984  (858)
  • 1
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    Storage peak gas-turbine power unit (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A storage gas-turbine power plant using a two-cylinder compressor with intermediate cooling is studied. On the basis of measured characteristics of a .25 Mw compressor computer calculations of the parameters of the loading process of a constant capacity storage unit (05.3 million cu m) were carried out. The required compressor power as a function of time with and without final cooling was computed. Parameters of maximum loading and discharging of the storage unit were calculated, and it was found that for the complete loading of a fully unloaded storage unit, a capacity of 1 to 1.5 million cubic meters is required, depending on the final cooling.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-75757
    Format: application/pdf
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  • 2
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    Economical drive for large tube mills by means of planetary gears (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The performance of heavy-duty planetary gear drives for ball mills used in the cement industry since 1967 is described. These gear drives transmit up to 8500 HP per installation. A reliable method for establishing gear drive efficiency is described and possible savings due to higher efficiency are indicated.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-75808
    Format: application/pdf
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  • 3
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    Turbo fluid machinery and diffusers (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The general theory behind turbo devices and diffusers is explained. Problems and the state of research on basic equations of flow and experimental and measuring methods are discussed. Conventional centrifugation-type compressor and fan diffusers are considered in detail.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-77467 , NAS 1.15:77467
    Format: application/pdf
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  • 4
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    Clearance flow-generated transverse forces at the rotors of thermal turbomachines (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Self-excited rotor whirl represents a serious hazard in the operation of turbomachines. The reported investigation has, therefore, the objective to measure the lateral forces acting on the rotor and to determine the characteristic pressure distribution in the rotor clearance area. A description is presented of an approach for calculating the leakage flow in the case of an eccentric rotor position on the basis of empirical loss coefficients. The results are reported of an experimental investigation with a turbine stage, taking into account a variation of the clearance characteristics. The pressure data measured are consistent with the theoretical considerations.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-77292 , NAS 1.15:77292
    Format: application/pdf
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  • 5
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    Microscopic aspects of the effect of friction reducers at the lubrication limit (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An attempt is made to analytically model the physicochemical properties of lubricants and their capacity to reduce friction. A technique of frozen fracturing of the lubricants was employed to study the dispersion of additives throughout a lubricant. Adsorption was observed at the liquid-solid interface, which was the region where the solid and lubricant met, and the molecular dispersion of the additive enhanced the effectiveness of the lubricant. The electrically conductive characteristics of the lubricant at the friction interface indicated the presence of tunneling effects. The Bethe model was used to examine the relationship between the coefficient of friction and the variation of interface thickness. The electron transport permitted an inelastic tunnel electron spectroscopic investigation of the molecular transformations undergone by the additive during friction episodes.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-77413 , NAS 1.15:77413
    Format: application/pdf
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  • 6
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    Electronic 4-wheel drive control device (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The internal rotation torque generated during operation of a 4-wheel drive vehicle is reduced using a control device whose clutch is attached to one part of the rear-wheel drive shaft. One torque sensor senses the drive torque associated with the rear wheel drive shaft. A second sensor senses the drive torque associated with the front wheel drive shaft. Revolution count sensors sense the revolutions of each drive shaft. By means of a microcomputer, the engagement of the clutch is changed to insure that the ratio of the torque sensors remains constant.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-77618 , NAS 1.15:77618
    Format: application/pdf
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  • 7
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    Dynamic property studies of Sterling engines (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A description is given of the results of dynamic property tests that were carried out using a trial produced prototype of a 50 KW Sterling engine. The features of the engine are shown graphically. A high thermal efficiency is found in the low rotation region.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-77719 , NAS 1.15:77719
    Format: application/pdf
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  • 8
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    The start-up of a gas turbine engine using compressed air tangentially fed onto the blades of the basic turbine (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The use of compressed air was suggested to increase the reliability and motor lifetime of a gas turbine engine. Experiments were carried out and the results are shown in the form of the variation in circumferential force as a function of the entry angle of the working jet onto the turbine blade. The described start-up method is recommended for use with massive rotors.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-77021 , NAS 1.15:77021
    Format: application/pdf
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  • 9
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    Algorithm for the stabilization of motion a bounding vehicle in the flight phase (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The unsupported phase of motion of a multileg bounding vehicle is examined. An algorithm for stabilization of the angular motion of the vehicle housing by change of the motion of the legs during flight is constructed. The results of mathematical modelling of the stabilization process by computer are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-75695 , PREPRINT-50
    Format: application/pdf
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  • 10
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    Effects of supply conditions on film thickness in lubricated Hertzian contacts (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: A generalization of the hydrodynamic expression for Hertzian contacts is described and various methods for calculating the thickness of the oil film winter steady-state, isothermal conditions are given. This is important for engineering applications such as gears and bearings because these results are closer to real operating conditions. Theories of lubrication are discussed, and the mathematics involved are presented using approximately 30 equations and 13 figures. For lubricated, linear, elliptical or point Hertzian contacts it is demonstrated how to calculate the thickness of the oil film at the center of the contact for steady-state isothermal conditions.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-75782
    Format: application/pdf
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