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

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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Optimization Research on Dynamic Balance of Spatial Engine under Limiting Shaking Moment

Materials Science Forum ◽

10.4028/www.scientific.net/msf.626-627.693 ◽

2009 ◽

Vol 626-627 ◽

pp. 693-698

Author(s):

Yong Yong Zhu ◽

S.Y. Gao

Keyword(s):

Mathematical Model ◽

Objective Function ◽

Kinetic Analysis ◽

Optimization Design ◽

Design Method ◽

Dynamic Balance ◽

Optimized Design ◽

Design Variables ◽

The Mathematical Model ◽

Shaking Moment

Dynamic balance of the spatial engine is researched. By considering the special wobble-plate engine as the model of spatial RRSSC linkages, design variables on the engine structure are confirmed based on the configuration characters and kinetic analysis of wobble-plate engine. In order to control the vibration of the engine frame and to decrease noise caused by the spatial engine, objective function is choosed as the dimensionless combinations of the various shaking forces and moments, the restriction condition of which presents limiting the percent of shaking moment. Then the optimization design is investigated by the mathematical model for dynamic balance. By use of the optimization design method to a type of wobble-plate engine, the optimization process as an example is demonstrated, it shows that the optimized design method benefits to control vibration and noise on the engines and improve the performance practically and theoretically.

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Optimal design for improving torque performance of permanent magnet motor

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i2.12.11307 ◽

2018 ◽

Vol 7 (2.12) ◽

pp. 292

Author(s):

Tae Kyoung Bang ◽

Kyung Hun Shin ◽

Jeong In Lee ◽

Cheol Han ◽

Sung Kook Cho ◽

...

Keyword(s):

Optimal Design ◽

Taguchi Method ◽

Objective Function ◽

Permanent Magnet ◽

Optimum Design ◽

Optimization Process ◽

Bldc Motor ◽

Original Design ◽

Design Point ◽

Design Variables

Background/Objectives: This paper deals with the optimal design of the BLDC motor considering a rotor structure that is used to electrically drive tools. Generally, electrically driven tools employ the BLDC motor, which should be able to operate in high-speed and high-vibration environments. However, it has the disadvantages of a high torque ripple and significant waveform fluctuation. Therefore, it is necessary to optimize it according to the usage condition.Methods/Statistical analysis: In improving the torque performance, this study performed the optimization process by employing the Taguchi method, which can achieve a robust design based on the design variables. In the optimization process, the objective functions are set using a weighting ratio depending on the importance of the objective function as back EMF, torque performance, and loss. Through the optimization process, the optimal design point that improved the performance of the objective function is derived. The improved design that applied the optimal design point is compared with the original design by using the finite element method (FEM) analysis results.Findings: In this study, the optimum design of the motor according to the design variables and the objective function is derived through the optimum design method using the Taguchi method by adopting the motor for the electrically driven tool as the interior permanent magnet type BLDC motor and the FEM results. Moreover, by comparing the analysis results with the optimized model and the initial model, the optimum design point that satisfies the restriction specification and the rated specification was found.Improvements/Applications: The optimum design point was found by using the Taguchi method and the loss and torque characteristics were improved.

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Shape Optimization of Hydraulic Structures: an Example of an Optimum Design of a Fish Passage

10.29007/2k64 ◽

2018 ◽

Author(s):

Pat Prodanovic ◽

Cedric Goeury ◽

Fabrice Zaoui ◽

Riadh Ata ◽

Jacques Fontaine ◽

...

Keyword(s):

Numerical Model ◽

Shape Optimization ◽

Objective Function ◽

Optimum Design ◽

Optimization Problem ◽

A Priori ◽

Coupled System ◽

Fish Passage ◽

Hydraulic Structures ◽

Design Variables

This paper presents a practical methodology developed for shape optimization studies of hydraulic structures using environmental numerical modelling codes. The methodology starts by defining the optimization problem and identifying relevant problem constraints. Design variables in shape optimization studies are configuration of structures (such as length or spacing of groins, orientation and layout of breakwaters, etc.) whose optimal orientation is not known a priori. The optimization problem is solved numerically by coupling an optimization algorithm to a numerical model. The coupled system is able to define, test and evaluate a multitude of new shapes, which are internally generated and then simulated using a numerical model. The developed methodology is tested using an example of an optimum design of a fish passage, where the design variables are the length and the position of slots. In this paper an objective function is defined where a target is specified and the numerical optimizer is asked to retrieve the target solution. Such a definition of the objective function is used to validate the developed tool chain. This work uses the numerical model TELEMAC- 2Dfrom the TELEMAC-MASCARET suite of numerical solvers for the solution of shallow water equations, coupled with various numerical optimization algorithms available in the literature.

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Hybrid Seven-bar Press Mechanism

Tehnički glasnik ◽

10.31803/tg-20180203202102 ◽

2018 ◽

Vol 12 (3) ◽

pp. 181-187

Author(s):

M. Erkan Kütük ◽

L. Canan Dülger

Keyword(s):

Genetic Algorithm ◽

Objective Function ◽

Design Optimization ◽

Hybrid System ◽

Degrees Of Freedom ◽

Dimensional Synthesis ◽

Design Variables ◽

Optimization Study ◽

Metal Stamping

An optimization study with kinetostatic analysis is performed on hybrid seven-bar press mechanism. This study is based on previous studies performed on planar hybrid seven-bar linkage. Dimensional synthesis is performed, and optimum link lengths for the mechanism are found. Optimization study is performed by using genetic algorithm (GA). Genetic Algorithm Toolbox is used with Optimization Toolbox in MATLAB®. The design variables and the constraints are used during design optimization. The objective function is determined and eight precision points are used. A seven-bar linkage system with two degrees of freedom is chosen as an example. Metal stamping operation with a dwell is taken as the case study. Having completed optimization, the kinetostatic analysis is performed. All forces on the links and the crank torques are calculated on the hybrid system with the optimized link lengths

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Topology Optimization of Hard-Coating Thin Plate for Maximizing Modal Loss Factors

Coatings ◽

10.3390/coatings11070774 ◽

2021 ◽

Vol 11 (7) ◽

pp. 774

Author(s):

Haitao Luo ◽

Rong Chen ◽

Siwei Guo ◽

Jia Fu

Keyword(s):

Topology Optimization ◽

Objective Function ◽

Composite Plates ◽

Optimization Method ◽

Hard Coating ◽

Design Variables ◽

Coating Composite ◽

Damping Materials ◽

Topology Optimization Method ◽

Loss Factors

At present, hard coating structures are widely studied as a new passive damping method. Generally, the hard coating material is completely covered on the surface of the thin-walled structure, but the local coverage cannot only achieve better vibration reduction effect, but also save the material and processing costs. In this paper, a topology optimization method for hard coated composite plates is proposed to maximize the modal loss factors. The finite element dynamic model of hard coating composite plate is established. The topology optimization model is established with the energy ratio of hard coating layer to base layer as the objective function and the amount of damping material as the constraint condition. The sensitivity expression of the objective function to the design variables is derived, and the iteration of the design variables is realized by the Method of Moving Asymptote (MMA). Several numerical examples are provided to demonstrate that this method can obtain the optimal layout of damping materials for hard coating composite plates. The results show that the damping materials are mainly distributed in the area where the stored modal strain energy is large, which is consistent with the traditional design method. Finally, based on the numerical results, the experimental study of local hard coating composites plate is carried out. The results show that the topology optimization method can significantly reduce the frequency response amplitude while reducing the amount of damping materials, which shows the feasibility and effectiveness of the method.

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Improvement of the Static and Dynamic Characteristics of Magnetic Head Sliders by Optimum Design

Journal of Tribology ◽

10.1115/1.555372 ◽

1999 ◽

Vol 122 (1) ◽

pp. 280-287 ◽

Cited By ~ 9

Author(s):

Hiromu Hashimoto ◽

Yasuhisa Hattori

Keyword(s):

Objective Function ◽

Optimum Design ◽

Amplitude Ratio ◽

Optimization Technique ◽

Hard Disk Drives ◽

Maximum Amplitude ◽

Disk Surface ◽

Operating Conditions ◽

Magnetic Head ◽

Design Variables

The aim of this paper is to develop a general methodology for the optimum design of magnetic head sliders in improving the spacing characteristics between a slider and disk surface under static and dynamic operating conditions of hard disk drives and to present an application of the methodology to the IBM 3380-type slider design. To generate the optimal design variables, the objective function is defined as the weighted sum of the minimum spacing, the maximum difference in the spacing due to variation of the radial location of the head, and the maximum amplitude ratio of the slider motion. Slider rail width, taper length, taper angle, suspension position, and preload are selected as the design variables. Before the optimization of the head, the effects of these five design variables on the objective function are examined by a parametric study, and then the optimum design variables are determined by applying the hybrid optimization technique, combining the direct search method and successive quadratic programming. From the obtained results, the effectiveness of optimum design on the spacing characteristics of magnetic heads is clarified. [S0742-4787(00)03701-2]

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Physics-Based Seated Posture Prediction for Pregnant Women and Validation Considering Ground and Seat Pan Contacts

Journal of Biomechanical Engineering ◽

10.1115/1.4007006 ◽

2012 ◽

Vol 134 (7) ◽

Cited By ~ 11

Author(s):

Bradley Howard ◽

Aimee Cloutier ◽

Jingzhou (James) Yang

Keyword(s):

Pregnant Women ◽

Objective Function ◽

Linear Regression Analysis ◽

Joint Torque ◽

Joint Torques ◽

Design Variables ◽

Optimization Formulation ◽

Posture Prediction ◽

Seated Posture ◽

End Effectors

An understanding of human seated posture is important across many fields of scientific research. Certain demographics, such as pregnant women, have special postural limitations that need to be considered. Physics-based posture prediction is a tool in which seated postures can be quickly and thoroughly analyzed, as long the predicted postures are realistic. This paper proposes and validates an optimization formulation to predict seated posture for pregnant women considering ground and seat pan contacts. For the optimization formulation, the design variables are joint angles (posture); the cost function is dependent on joint torques. Constraints include joint limits, joint torque limits, the distances from the end-effectors to target points, and self-collision avoidance constraints. Three different joint torque cost functions have been investigated to account for the special postural characteristics of pregnant women and consider the support reaction forces (SRFs) associated with seated posture. Postures are predicted for three different reaching tasks in common reaching directions using each of the objective function formulations. The predicted postures are validated against experimental postures obtained using motion capture. A linear regression analysis was used to evaluate the validity of the predicted postures and was the criteria for comparison between the different objective functions. A 56 degree of freedom model was used for the posture prediction. Use of the objective function minimizing the maximum normalized joint torque provided an R2 value of 0.828, proving superior to either of two alternative functions.

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Reduction of Forced Vibration Response by Optimum Balance of Linkage and Optimum Design of System

Volume 1A: 16th Biennial Conference on Mechanical Vibration and Noise ◽

10.1115/detc97/vib-4212 ◽

1997 ◽

Author(s):

She-min Zhang ◽

Nobuyoshi Morita ◽

Takao Torii

Keyword(s):

Objective Function ◽

Root Mean Square ◽

Forced Vibration ◽

Vibration Response ◽

New Method ◽

Mean Square ◽

Design Variables ◽

Calculation Results ◽

Angular Velocities ◽

Optimum Balance

Abstract This paper proposes a new method to reduce the forced vibration response of frame of linkage. It is that the root-mean-square (RMS) value of binary maximum (Bmax) of forced vibration response at a series of angular velocities is taken as the objective function, and the counterweight mass parameters of links and the stiffness factors are used as design variables. Then, it is found out that the responses are related not only to the Bmax value of shaking forces, but also to the shape of curve of shaking forces. The calculation results are compared with those of two other methods used in the reduction of forced vibration response by optimized balance of linkages, and it is shown that the new method can significantly reduce the responses of frame of linkage.

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Optimum Design of Magnetic Head Slider Under Static and Dynamic Operation Conditions of Hard Disk Drive

Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise ◽

10.1115/detc99/vib-8283 ◽

1999 ◽

Author(s):

Yasuhisa Hattori ◽

Hiromu Hashimoto ◽

Masayuki Ochiai

Keyword(s):

Objective Function ◽

Hard Disk Drive ◽

Optimum Design ◽

Hard Disk ◽

Disk Drive ◽

Magnetic Head ◽

Head Slider ◽

Dynamic Operation ◽

Operation Conditions ◽

Design Variables

Abstract The aim of this paper is to develop the general methodology for the optimum design of magnetic head slider for improving the spacing characteristics between head slider and disk surfaces under the static and dynamic operation conditions of hard disk drive and to present an application of the methodology to IBM 3380-type slider design. In the optimum design, the objective function is defined as the weighted sum of minimum spacing, maximum difference of spacing due to variation of radial location of head and maximum amplitude ratio of slider motion. Slider rail width, taper length, taper angle, suspension position and preload are selected as the design variables. Before the optimization of magnetic head slider, the effects of these five design variables on the objective function are examined by the parametric study, and then the optimum design variables are determined by applying the hybrid optimization technique combining the direct search method and the successive quadratic programming (SQP). From the results obtained, the effectiveness of optimum design on the spacing characteristics of magnetic head slider is clarified.

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