8 research outputs found
Mechanism Design Optimization through CAD-Based Bayesian Optimization and Quantified Constraints
This research delves into optimizing mechanism design, with an emphasis on
the energy efficiency and the expansive design possibilities of reciprocating
mechanisms. It investigates how to efficiently integrate Computer-Aided Design
(CAD) simulations with Bayesian Optimization (BO) and a constrained design
space, aiming to enhance the design optimization process beyond the confines of
traditional kinematic and dynamic analysis. The study sets out to create a
novel optimization framework that merges CAD simulations with a BO strategy.
Initially, the feasibility of a mechanism design is assessed through CAD-motion
simulations, which gauge its practicality. Upon deeming a design feasible, an
evaluation via CAD-motion simulations is conducted to ascertain the objective
value. This research proposes utilizing non-parametric Gaussian processes for
crafting a surrogate model of the objective function, considering the design
space's static and dynamic constraints. The findings reveal that the introduced
CAD-based Bayesian Optimization framework adeptly identifies optimal design
parameters that minimize root mean square (RMS) torque while complying with
predetermined constraints. This method markedly diminishes the complexity seen
in analytical approaches, rendering it adaptable to intricate mechanisms and
practicable for machine builders. The framework evidences the utility of
integrating constraints in the optimization process, showing promise for
attaining globally optimal designs efficiently. A case study on an emergency
ventilator, with three design parameters, demonstrates a 71% RMS torque
reduction after 255 CAD-based evaluations, underscoring the approach's
effectiveness and its potential for refining mechanism design optimization.Comment: 13 pages, 13 figure
CAD-Based Design Optimization of Four-Bar Mechanisms: An Emergency Ventilator Case Study
The design optimization of mechanisms is promising as it results in more energy-efficient machines without compromising performance. However, machine builders do not apply state-of-the-art methods, as these algorithms require case-specific theoretical analysis. Moreover, the design synthesis approaches in the literature predominantly utilize heuristic optimizers, leading to suboptimal local minima. This paper introduces a widely applicable workflow, guaranteeing the global optimum. The constraints describing the feasible region of the possible designs are essential to find the global optimum. Therefore, kinematic analysis of the point-to-point planar four-bar mechanism is discussed. Within the feasible design space, objective value samples were generated through the CAD multi-body software. These motion simulations determine the required torque to fulfill the movement for a combination of design parameters. This replaces the cumbersome analytic derivation of the torque. This paper introduces sparse interpolation techniques to avoid brute force sampling of the design space. The advantage of this approach is that it is easily scalable to more design parameters, as the interpolation method minimizes the number of necessary samples. This paper explains the mathematical background of our developed interpolation approach. However, a step-by-step procedure is introduced to allow the employment of the interpolation technique by machine designers without the necessity to understand the underlying mathematics. Finally, the mathematical expression, obtained from the interpolation, enables applying global optimizers. In a case study of an emergency ventilator mechanism with three design parameters, 1870 CAD motion simulations allowed reducing the RMS torque of the mechanism by 67
CAD-Based Design Optimization of Four-Bar Mechanisms: An Emergency Ventilator Case Study
The design optimization of mechanisms is promising as it results in more energy-efficient machines without compromising performance. However, machine builders do not apply state-of-the-art methods, as these algorithms require case-specific theoretical analysis. Moreover, the design synthesis approaches in the literature predominantly utilize heuristic optimizers, leading to suboptimal local minima. This paper introduces a widely applicable workflow, guaranteeing the global optimum. The constraints describing the feasible region of the possible designs are essential to find the global optimum. Therefore, kinematic analysis of the point-to-point planar four-bar mechanism is discussed. Within the feasible design space, objective value samples were generated through the CAD multi-body software. These motion simulations determine the required torque to fulfill the movement for a combination of design parameters. This replaces the cumbersome analytic derivation of the torque. This paper introduces sparse interpolation techniques to avoid brute force sampling of the design space. The advantage of this approach is that it is easily scalable to more design parameters, as the interpolation method minimizes the number of necessary samples. This paper explains the mathematical background of our developed interpolation approach. However, a step-by-step procedure is introduced to allow the employment of the interpolation technique by machine designers without the necessity to understand the underlying mathematics. Finally, the mathematical expression, obtained from the interpolation, enables applying global optimizers. In a case study of an emergency ventilator mechanism with three design parameters, 1870 CAD motion simulations allowed reducing the RMS torque of the mechanism by 67
CAD-Based Design Optimization of Four-Bar Mechanisms: An Emergency Ventilator Case Study
The design optimization of mechanisms is promising as it results in more energy-efficient machines without compromising performance. However, machine builders do not apply state-of-the-art methods, as these algorithms require case-specific theoretical analysis. Moreover, the design synthesis approaches in the literature predominantly utilize heuristic optimizers, leading to suboptimal local minima. This paper introduces a widely applicable workflow, guaranteeing the global optimum. The constraints describing the feasible region of the possible designs are essential to find the global optimum. Therefore, kinematic analysis of the point-to-point planar four-bar mechanism is discussed. Within the feasible design space, objective value samples were generated through the CAD multi-body software. These motion simulations determine the required torque to fulfill the movement for a combination of design parameters. This replaces the cumbersome analytic derivation of the torque. This paper introduces sparse interpolation techniques to avoid brute force sampling of the design space. The advantage of this approach is that it is easily scalable to more design parameters, as the interpolation method minimizes the number of necessary samples. This paper explains the mathematical background of our developed interpolation approach. However, a step-by-step procedure is introduced to allow the employment of the interpolation technique by machine designers without the necessity to understand the underlying mathematics. Finally, the mathematical expression, obtained from the interpolation, enables applying global optimizers. In a case study of an emergency ventilator mechanism with three design parameters, 1870 CAD motion simulations allowed reducing the RMS torque of the mechanism by 67%
Bode-based speed proportional integral and notch filter tuning of a permanent magnet synchronous machine driven flexible system
A resonance and an antiresonance peak characterize many industrial mechanisms
dynamics driven by a Permanent Magnet Synchronous Motor (PMSM). The presence of
the resonance peak can lead to vibrations and instability of the system. On
that account, advanced methods exist to tune the speed Proportional Integral
(PI) controller based on adaptive or fuzzy theory. However, those methods
require expertise in control theory and are not available in commercial drives.
For that, this paper proposes a Bode-based method for PI parameters selection
in combination with a notch filter that can be easily set in any industrial
drive. The proposed method is compared with conventional tuning methods in a
physical setup
CAD-based design optimization of four-bar mechanisms : an emergency ventilator case study
The design optimization of mechanisms is promising as it results in more energy-efficient machines without compromising performance. However, machine builders do not apply state-of-the-art methods, as these algorithms require case-specific theoretical analysis. Moreover, the design synthesis approaches in the literature predominantly utilize heuristic optimizers, leading to suboptimal local minima. This paper introduces a widely applicable workflow, guaranteeing the global optimum. The constraints describing the feasible region of the possible designs are essential to find the global optimum. Therefore, kinematic analysis of the point-to-point planar four-bar mechanism is discussed. Within the feasible design space, objective value samples were generated through the CAD multi-body software. These motion simulations determine the required torque to fulfill the movement for a combination of design parameters. This replaces the cumbersome analytic derivation of the torque. This paper introduces sparse interpolation techniques to avoid brute force sampling of the design space. The advantage of this approach is that it is easily scalable to more design parameters, as the interpolation method minimizes the number of necessary samples. This paper explains the mathematical background of our developed interpolation approach. However, a step-by-step procedure is introduced to allow the employment of the interpolation technique by machine designers without the necessity to understand the underlying mathematics. Finally, the mathematical expression, obtained from the interpolation, enables applying global optimizers. In a case study of an emergency ventilator mechanism with three design parameters, 1870 CAD motion simulations allowed reducing the RMS torque of the mechanism by 67