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[en] Based on structural feature of running gear of APM and referring to research achievement, the method of calculating APM envelope gauge is discussed and an example is illustrated. A reference for drawing up the standard of APM envelope gauge is provided. (paper)
[en] Concurrent designing of tolerance has become a vital concern in product and process development due to the relationship between quality, functionality and product cost. It is one of the well explored areas in combinatorial optimization. In this paper, a recently developed optimization algorithm, called Bat algorithm (BA), is used for optimizing the tolerance based on concurrent objectives to minimize the manufacturing cost, present worth of expected quality loss and quality loss. The mechanical assemblies such as Bevel gear assembly (A), Gear box assembly (B) and Suction union assembly (C) are considered to demonstrate the proposed algorithm. It is found that the BA has produced better results than other methods in initial generations for concurrent tolerance problems.
[en] This documentation contains 5890 titles. It comprises the following topics: 1) Subdivision of subjects (German, English, French); 2) systematic bibliography of titles; 3) personal and corporate author indexes; 4) report and paper number index; 5) standard number index; 6) conference index by conference place; 7) subject index. (orig./HP)
[de]Diese Dokumentation enthaelt 5890 Titel. Sie gliedert sich in 1) Sachgebietseinteilung (deutsch, englisch, franzoesisch); 2) systematische Titelbibliographie; 3) Register persoenlicher und korporativer Autoren; 4) Report- und Paper-Nummern-Register; 5) Normenregister; 6) Konferenz-Register nach dem Tagungsort; 7) Sachregister in Englisch. (orig./HP)
[en] Entrapment of liquid in the intertooth space of a gear-driven pump is considered. A method is proposed for its elimination. The influence of annular channels on the volume losses in the pump is shown. The decrease in pump efficiency in the presence of annular channels is assessed.
[en] Facets must be machined at the end of gear teeth. The shaping of facets by single-turn worm mills is considered in detail. Deficiencies are found in familiar design methods for such mills. Formulas are proposed for the calculation of single-turn worm mills used in machining conical round-tooth gears.
[en] This book gives description of terms on machine drawing including drawing tools, letter, form of floor plan, kinds of floor plan, criterion, kinds of lines, projection, auxiliary projection, method of section, dimensioning method, surface roughness, surface wave, screw, bolts, nuts, shape of screw for stopping, kinds of pins, washers and gears, springs, symbols of metal materials dimensional tolerance and fit term and structure and kinds of ball and roller bearing.
[en] Highlights: • This study introduces the kinematic design of TENGs for enhancing output energy. • Gear train and slider-crank mechanisms are applied to design high-performance TENGs. • A working gear with a smaller size in a gear train provides higher working frequency. • Our gear-based TENG system improves both the magnitude and the generation time of output power. • We demonstrate the enhanced performance of our TENG system via capacitor charging. Triboelectric nanogenerators (TENGs) can harvest a variety of environmental energies including sound, waves, wind, and human motions, but low input energies nomally generate low output power although TENGs have high power conversion efficiency (PCE). In this study, we report the kinematic design of TENGs for improving the PCE. By adopting a gear train in a TENG system, the frequency (fw) at the working gear could be larger than that (fin) at the input gear. Finally, the output energy of TENGs with a higher working frequency could be improved, thus providing enhanced PCE. We investigated the output performance of our gear-based TENG system under input frequencies of 1.5, 3, and 4.5 Hz by controlling the gear ratio (i.e. 1, 1.7, and 5). Under the input frequencies, the output voltage and current from our gear-based TENG system were enhanced up to the maximum of 3.6 times and 4.4 times, respectively. It was analyzed that the PCE was improved up to 7.57 times at the gear ratio of 5 under the input frequency of 1.5 Hz. In order to clearly understand improved performance of the gear-based TENG system, we used our TENG system to charge a capacitor by rectifying the output voltage. Under the input frequency of 4.5 Hz, we obtained a 3 times enhanced rectifying voltage at a gear ratio of 5. Interestingly, capacitor charging voltage was enhanced up to about 8 fold in using our TENG system. It is attributed that our gear-based TENG system could improve simultaneously the magnitude as well as the generation time of output power, finally enhancing output energy. Therefore, our gear-based TENG system provided an effective way to enhance the PCE of TENGs operating at a given input energy.
[en] The actuator of the motor-operated valve (MOV) is the system which transfers the torque from the electrical motor to the stem. It is composed of the spur gear set, the worm-worm gear set, bearings and so on. Among them, the condition of the worm-worm gear set affect most on the performance of the actuator such as the efficiency. Therefore, the diagnosing defects and maintaining the performance of the worm-worm gear set contributes to the safe operation of power plants. However, it is very difficult to inspect it without disassembly. In this paper, non-intrusive diagnostic methods are developed to identify the defects which commonly occur: the wear of the gear teeth, broken teeth and the eccentricity of the assembly. Motor torque signals are used as the basic diagnostic signatures and the methods are verified with the various experiments
[en] The appearance of high-frequency kinematic errors in the generating train is analyzed for the new generation of gear-hobbing machines. Methods of diminishing those high-frequency components are proposed. The transfer of cyclic errors in the generating train to the gear being produced is discussed.