Dynamic Analysis of Mechanical Systems With Clearances—Part 2: Dynamic Response

1971 ◽  
Vol 93 (1) ◽  
pp. 310-316 ◽  
Author(s):  
S. Dubowsky ◽  
F. Freudenstein
Keyword(s):  
Control Theory ◽  
Dynamic Response ◽  
Dynamic Analysis ◽  
Mechanical Systems ◽  
Operating Conditions ◽  
Approximate Methods ◽  
Simulation Techniques ◽  
The Impact

The theory developed in Part I has been applied to the determination of the dynamic response of the Impact Pair under various operating conditions. Simulation techniques, as well as approximate methods used in control theory, have been used for this purpose.

Dynamic Analysis of Mechanical Systems With Clearances—Part 1: Formation of Dynamic Model

1971 ◽  
Vol 93 (1) ◽  
pp. 305-309 ◽  
Author(s):  
S. Dubowsky ◽  
F. Freudenstein
Keyword(s):  
Equations Of Motion ◽  
Operating Conditions ◽  
Coupled Systems ◽  
Dynamical Response ◽  
Dynamic Force ◽  
Dynamical Equations ◽  
Mechanical Joint ◽  
The Impact ◽  
Insight Into

A mathematical model of an elastic mechanical joint with clearances has been formulated and the dynamical equations of motion derived (Part I). The model, which we have called an Impact Pair, is basic to the determination of the dynamical response of mechanical and electromechanical systems with clearances, including determination of dynamic force amplification, frequency response, time-displacement characteristics, and other dynamic characteristics. Whenever possible, the results for the impact pair under various operating conditions are illustrated by graphs, which may also offer some insight into the behavior of clearance-coupled systems.

Study of the Dynamic Characteristics of Piston Chamber Pressure and its Optimizing

2014 ◽  
Vol 602-605 ◽  
pp. 277-282
Author(s):  
Bin Qu Yan ◽  
Shu Mei Chen ◽  
Chuan Ming Chen
Keyword(s):  
Dynamic Response ◽  
Operating Conditions ◽  
Piston Pump ◽  
Cylinder Block ◽  
Chamber Pressure ◽  
Excessive Pressure ◽  
New Type ◽  
The Stability ◽  
The Impact ◽  
Piston Chamber

In order to develop a new type of high-performance axial piston pump, the impact of the dynamic response characteristics of piston chamber pressure to the stability of cylinder block were analyzed. This paper a new type of valve plate which combined two fixed throttling grooves with a triangular groove (called three-level gain) was put forward so as to reducing the excessive pressure adjustment of the dynamic response of piston chamber pressure and improving the stability of cylinder block. The simulation results indicate that not only the cavitation is reduced, but also the stability of the dynamic response of piston chamber pressure is remained at various swash plate angle which makes it applicable to variable piston pump. The results also indicate that the flow pulsation of variable displacement pump is significantly decreased in different operating conditions.

scholarly journals Synthesis of polar copolymers by the process of emulsion via free radicals (FRP)

2019 ◽  
pp. 1-5
Author(s):  
Luis Mario Magaña-Maldonado ◽  
David Contreras-López
Keyword(s):  
Free Radicals ◽  
Batch Reactor ◽  
Operating Conditions ◽  
Polymerization Process ◽  
Optimal Operating ◽  
Molecular Weights ◽  
Polymer Industry ◽  
The Impact ◽  
Vinyl Propionate

At present, the polymer industry has gained increasing importance due to the versatility of its properties, as well as the impact they have on the environment. The present investigation provides the determination of optimal operating conditions for the polymerization of styrene and vinyl propionate in a Batch reactor, as well as the copolymerization of styrene with propionate monomers by the process of emulsion via free radicals, allowing to observe the variations with respect to Reaction yields and molecular weights. Another important factor is the activation of the initiator so that the polymerization process begins within each of the micelles. Likewise, it was found that, in the copolymerizations, there are considerable variations with respect to reaction yields and molecular weights as the concentrations are modified. In addition, it was found that there are higher yields in styrene polymerizations per solution than emulsion.

Effect of Errors in Temperature Measurement on the Accuracy of Composition of the Liquid-Vapour Phases and Their Impact on the Calculated Number of Theoretical Stages of Rectification Columns

1992 ◽  
Vol 57 (9) ◽  
pp. 1867-1878
Author(s):  
Ján Dojčanský ◽  
Soňa Bafrncová ◽  
Július Surový
Keyword(s):  
Phase Composition ◽  
Binary Systems ◽  
Equilibrium Temperature ◽  
Systematic Errors ◽  
Operating Conditions ◽  
Rectification Column ◽  
Relative Volatility ◽  
The Impact ◽  
Calculated Number

The effect of random and systematic errors in the determination of the equilibrium temperature on the phase composition in isobaric L-G equilibria was simulated on five binary systems with different size and relative volatility. The impact of the inaccuracies on the calculated number of theoretical stages of a continuously operating rectification column is discussed with respect to the different operating conditions of the separatory process.

A Determination of Contact-Loss at a Bearing of a Linkage Mechanism

1977 ◽  
Vol 99 (2) ◽  
pp. 375-379 ◽  
Author(s):  
C. L. S. Wu ◽  
S. W. E. Earles
Keyword(s):  
Experimental Investigation ◽  
Dynamic Response ◽  
Point Of View ◽  
Linkage Mechanism ◽  
Design Point ◽  
The Impact

A method is described for analyzing the kinematic and dynamic response of a linkage mechanism in which one bearing has a known clearance. Assuming the clearance to be represented by a massless link, the analysis predicts the occurrence of contact-loss. Part of an extensive experimental investigation is presented in which the impact accelerations resulting from contact-loss are measured. A good correlation is shown to exist between the predicted and measured times of contact-loss. Although the analysis may predict no contact-loss, it does not readily indicate, from a design point of view, how this condition could be produced.

scholarly journals Experimental dynamic analysis of the existing footbridge in Dobřichovice town

2020 ◽  
Vol 313 ◽  
pp. 00002
Author(s):  
Michal Polák ◽  
Tomáš Plachý ◽  
Adam Čítek ◽  
Karolína Berková ◽  
Petra Hájková ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Radar Interferometry ◽  
Mode Shapes ◽  
Response Measurement ◽  
Second Stage ◽  
Pedestrian Traffic ◽  
Two Stages ◽  
Response Determination

The paper presents an experimental dynamic analysis of the existing footbridge across the Berounka River in Dobřichovice town, Czech Republic. The experiment was realized in two stages. The main purpose of the first one was the vibration response determination of the footbridge induced by pedestrians. At first, the natural frequencies and mode shapes of its horizontal load-bearing structure were measured and then the footbridge was loaded by different groups of pedestrians. The response was observed and dynamic behaviour of the footbridge was evaluated. In the course of the second stage of the experiment, the dynamic response of the footbridge deck to pedestrian traffic was measured by two different methods using radar interferometry and classical approach realized by piezoelectric accelerometers. Basic objectives of the second stage were to evaluate the fundamental modal characteristics of the footbridge and to verify new approach to dynamic response measurement – radar interferometry realized by two synchronized radars.

Centrifugal Compressors During Fast Transients

2011 ◽  
Vol 133 (7) ◽  
Author(s):  
Matthew Blieske ◽  
Rainer Kurz ◽  
Augusto Garcia-Hernandez ◽  
Klaus Brun
Keyword(s):  
Steady State ◽  
Flow Speed ◽  
Operating Conditions ◽  
Nonstationary Heat Transfer ◽  
Fast Transients ◽  
Rapid Transients ◽  
Relationship Of ◽  
The Impact ◽  
Flow Head

Transient studies for compressor systems allow the prediction of the compressor system behavior during fast transients such as they occur during emergency shutdowns. For the system simulations, the compressor behavior is assumed to be quasi-steady-state. This means in particular that the steady-state compressor flow-head-efficiency-speed map remains valid. During well instrumented emergency shutdown tests conducted on a centrifugal compressor system under realistic operating conditions, data showing the head-flow-speed relationship of the rapidly decelerating compressor were taken. These data are compared with steady-state head-flow relationships taken at a number of speeds. This allows the determination of the relative deviation between the transient and steady-state head-flow-relationships and thus answers the question of the validity of steady-state assumptions during rapid transients. The impact of the fast transients on efficiency and consumed power, which can be derived from the speed decay of the system, as well as the impact of nonstationary heat transfer are also evaluated and reported.

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