Xem 1-12 trên 12 kết quả Crank mechanism
  • The compensating crank is an adjustable lever in the feedback linkage between the servomotor and the large plunger of the dashpot. Adjusting the compensating crank adjusts the amount the large dashpot plunger moves for a given movement of the servomotor. If there is no leakage in the oil reservoir, the small dashpot plunger will move rigidly with the large plunger and there will be additional permanent speed droop.

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  • KEY EQUATIONS AND CHARTS FOR DESIGNING MECHANISMS FOUR-BAR LINKAGES AND TYPICAL INDUSTRIAL APPLICATIONS All mechanisms can be broken down into equivalent four-bar linkages. They can be considered to be the basic mechanism and are useful in many mechanical operations. FOUR-BAR LINKAGES—Two cranks, a connecting rod and a line between the fixed centers of the cranks make up the basic four-bar linkage. Cranks can rotate if A is smaller than B or C or D. Link motion can be predicted.

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  • Move gates to 10 percent open as measured at the scale on the servomotors and check to see if the gate position needle indicates 10 percent. If the gate position needle does not indicate 10 percent, move the eccentric adjustment in the restoring shaft bell crank to position it correctly (photograph 3). Move it toward the restoring shaft if there is over travel and away from the restoring shaft if there is under travel (figure 7). Move the gates to 90 percent, as measured at the servomotor scale, and check the gate position indicator needle. It may...

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  • In this day and age of ever-shorter time schedules and increasing expectations of productivity gains in every aspect of engineering activity, creative problem solving has become prominent among the most important skills that engineers possess. Unfortunately, in the day-to-day intensity of the search for new engineering solutions, it is easy to lose touch with the foundations of that creativity.

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  • Place a small level on top of the compensating crank (photograph 1). Make sure that it is resting on a flat portion of the crank. If the compensating crank is not level, adjust the length of the restoring cable to make it level. After each adjustment, operate the gates back and forth several times to seat the restoring cable and then bring the gates back to exactly 50 percent. When the compensating crank is level with the gates at 50 percent, the black gate position needle should be at 50 percent. If it isn’t,...

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  • CONTENTS CONTENTS 558 C H A P T E R n A Textbook of Machine Design Levers 15 1. Introduction. 2. Application of Levers in Engineering Practice. 3. Design of a Lever. 4. Hand Lever. 5. Foot Lever. 6. Cranked Lever. 7. Lever for a Lever Safety Valve. 8. Bell Crank Lever. 9. Rocker Arm for Exhaust Valve. 10. Miscellaneous Levers. 15.1 Introduction A lever is a rigid rod or bar capable of turning about a fixed point called fulcrum. It is used as a machine to lift a load by the application of a small effort. The ratio of load lifted to the effort applied is called mechanical...

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  • In the fourth chapter of this section, the authors present a modification of the Crank- Nicholson scheme for two-dimensional fluid mechanical, heat and mass transfer problems. The modification divides the nodal points into groups of four. The method is applicable to parallel computing, which is increasing in importance as problems become more computationally intensive. Computational experiments demonstrate improved convergence rates over previous methods.

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  • Volume flow rate of compressed air is provided by a separate rate Pneumatic valve for each engine. This article is structured as follows: first, a mathematical modeling of mechatronic systems origin, which results in a state-space description of nonlinear icon.

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  • Variable loading in mechanical joints: Machine parts are often subjected to variable loading. In many cases pulsating or intermittent loads are applied from outside, for example, in punching press forces of very large magnitude is applied for a short while (impulsive force), in crank shafts variable loads act due to nature of force arising from combustion cycle in cylinders

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  • 1. Introduction. 2. Application of Levers in Engineering Practice. 3. Design of a Lever. 4. Hand Lever. 5. Foot Lever. 6. Cranked Lever. 7. Lever for a Lever Safety Valve. 8. Bell Crank Lever. 9. Rocker Arm for Exhaust Valve. 10. Miscellaneous Levers. 15.1 Introduction A lever is a rigid rod or bar capable of turning about a fixed point called fulcrum. It is used as a machine to lift a load by the application of a small effort. The ratio of load lifted to the effort applied is called mechanical advantage. Sometimes, a lever is merely used to facilitate the application...

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  • CHAPTER 41 LINKAGES Richard E. Gustavson Technical Staff Member The Charles Stark Draper Laboratory, Inc. Cambridge, Massachusetts BASIC LINKAGE CONCEPTS/41.1 MOBILITY CRITERION / 41.4 ESTABLISHING PRECISION POSITIONS / 41.4 PLANE FOUR-BAR LINKAGE / 41.4 PLANE OFFSET SLIDER-CRANK LINKAGE / 41.8 KINEMATIC ANALYSIS OF THE PLANAR FOUR-BAR LINKAGE / 41.8 DIMENSIONAL SYNTHESIS OF THE PLANAR FOUR-BAR LINKAGE: MOTION GENERATION/41.10 41.8 DIMENSIONAL SYNTHESIS OF THE PLANAR FOUR-BAR LINKAGE: CRANKANGLE COORDINATION /41.18 41.9 POLE-FORCE METHOD/41.20 41.10 SPATIAL LINKAGES/41.21 REFERENCES/41.

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  • CHAPTER 13 KEY EQUATIONS AND CHARTS FOR DESIGNING MECHANISMS FOUR-BAR LINKAGES AND TYPICAL INDUSTRIAL APPLICATIONS All mechanisms can be broken down into equivalent four-bar linkages. They can be considered to be the basic mechanism and are useful in many mechanical operations. FOUR-BAR LINKAGES—Two cranks, a connecting rod and a line between the fixed centers of the cranks make up the basic four-bar linkage. Cranks can rotate if A is smaller than B or C or D. Link motion can be predicted.

    pdf33p medinova 26-10-2010 49 5   Download

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