Estimation of Counterweight for Shaking Force Balancing of a Crank-Rocker Mechanism

Mohammed, Salah E.; Baharom, Masri B.; Aziz, Abdul

doi:10.4028/www.scientific.net/amm.663.135

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…It can be noticed that case-2, (σ 1 , σ 2 ) values (0.7, 0.3), gives best results in term of reducing shaking forces and driving torque, while all cases giving close results in term of reducing shaking moments. 3 introduced a comparison between the three cases introduced in this study, full force balance method (FFB) in the paper [20], optimization methods by Yan et al [10], and Demeulenaere et al [26]. It can be noticed that FFB and case-2 of this study give best results in term of shaking force reduction by about 91%.…”

Section: Resultsmentioning

confidence: 81%

“…Some of these methods include adding counterweights, distributing linkages' masses, while others use rotating disks or duplicating linkages [12,[14][15][16][17][18][19]. Mohammed et al [20] presented a method for complete shaking force elimination of a crank-rocker mechanism by using counterweights. His method was simple to grasp and practical, where the first step involves adding counterweights to the crank and rocker links and then followed by applying the law of motion to obtain the balanced case.…”

Section: Introductionmentioning

confidence: 99%

“…DCR mechanism: (a) 3-D view with mechanism motion path; (b) Schematic side view Eqns. (18)-(20) represent the shaking forces and shaking moments of a single four-bar mechanism. Prior to implementing these equations to formulate a double mechanism model, few assumptions were made for simplification purposes.…”

mentioning

confidence: 99%

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Balancing and Simulation of a Double Crank-Rocker Engine Model for Optimum Reduction of Shaking Forces and Shaking Moments

Albaghdadi¹,

Baharom²,

Sualiman³

2021

MMEP

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In this paper, a new configuration of Crank-Rocker (CR) model has been proposed by duplicating its mechanism. The method has been implemented to overcome vibration problem on a single-piston Crank-Rocker engine caused by system unbalance. The new method suggests combining conventional method of adding counterweights to reduce shaking forces and eliminating the inertial moments on system by implementing the new layout. A dynamic study of the new model is presented, then the objective function is derived and implemented to perform the optimization process. Related design variables and system constraints are introduced to determine attached counterweights optimized characteristics. For results validation, the simulation, dynamic analysis, and optimization process were conducted using ADAMS VIEW® software. The output results were presented and discussed to verify the validity of the suggested method. It was noticed that the method was very effective and has managed to reduce the total shaking forces by about 91%, shaking moment by about 66%; and the driving torque by 27%.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Balancing and Simulation of a Double Crank-Rocker Engine Model for Optimum Reduction of Shaking Forces and Shaking Moments

Albaghdadi¹,

Baharom²,

Sualiman³

2021

MMEP

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“…The main advantage of the CR engine over most other toroidal engines is its reduced complexity and it is less bulky. In addition to that, the inertial forces for the CR engine can be dynamically balanced [8]. The engine can be modified easily to work on any types of fuels such as biodiesel, compressed natural gas, hydrogen and ethanol.…”

Section: The Crank-rocker Engine Concept and Operating Principlementioning

confidence: 99%

Modelling of Combustion Characteristics of a Single Curved-Cylinder Spark-Ignition Crank-Rocker Engine

et al. 2019

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A crank-rocker engine is a new invention used to convert oscillating motion from the curve-piston into the rotary motion of the crankshaft. The configuration of this new engine is different from the normal slider-crank engine, so the existing model used to calculate the combustion characteristic is not appropriate for this new engine. A fundamental thermodynamic model of a single curved-cylinder spark-ignition crank-rocker engine is presented. The model was simulated in MATLAB to predict the combustion characteristics at different operating conditions. The friction losses, residual gas fraction and combustion efficiency were introduced into the combustion model to improve the overall accuracy of the model. The developed model was used to analyze and evaluate the in-cylinder pressure, fuel burn rate, and heat release under various crank angle positions. To validate the predictions of the model, experimental tests were conducted on a single-cylinder crank-rocker engine at an engine speed of 2000 rpm, spark timing of 8.60 CA BTDC, full load and wide-open throttle (WOT) condition. Finally, the results were plotted and compared with the simulation results. The findings obtained from the current study have shown the ability of the simulation model to predict the combustion characteristics under different operating conditions. The agreement between the results of the present model and experimental data was reasonably good. This research work proposes a new model which can predict the behavior of the crank-rocker engine. The information gained from this study will aid in the tuning process and future development of this engine.

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“…Therefore, in his research, Mohammed et.al. [12] proposed a method to reduce resulting forces caused by system unbalance. This study succeeded in eliminating all shaking forces by adding counterweights to both crank and rocker linkages.…”

Section: Introductionmentioning

confidence: 99%

Hybrid methodology using balancing optimization and vibration analysis to suppress vibrations in a double crank-rocker engine

Albaghdadi¹,

Baharom²,

Sulaimana³

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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This study aims to present mathematical modelling to evaluate and analyze double crankrocker engine performance. The study suggests the use of two methods to reduce system vibration through balancing optimization and vibrational analysis. The combination of both methods acts as a verification method; besides it can be used as a tool for further system design enhancement and condition monitoring. The derived mathematical model is then used for balancing optimization to identify system shaking forces and moments, while variable speed is considered as an added parameter to evolve the optimization process. This factor shows better enhancement in reducing system shaking forces and moments compared to constant speed balancing method. Next, the system characteristics were concluded in terms of mode shapes and natural frequencies using modal and frequency response analysis, which give clear clue for secure system operational ground. Finally, the reduction in system vibrations was translated into engine’s centre of mass velocity, which evaluates balancing process effectiveness and indicate if further enhancement should be conducted.

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Estimation of Counterweight for Shaking Force Balancing of a Crank-Rocker Mechanism

Cited by 3 publications

References 8 publications

Balancing and Simulation of a Double Crank-Rocker Engine Model for Optimum Reduction of Shaking Forces and Shaking Moments

Balancing and Simulation of a Double Crank-Rocker Engine Model for Optimum Reduction of Shaking Forces and Shaking Moments

Modelling of Combustion Characteristics of a Single Curved-Cylinder Spark-Ignition Crank-Rocker Engine

Hybrid methodology using balancing optimization and vibration analysis to suppress vibrations in a double crank-rocker engine

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