Hydraulic Tandem Hinge Position Optimization for Lightweight Design
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Solution Overview
Problem
Conventional methods for optimizing the joint hinge point position of hydraulically driven tandem mechanisms fail to guarantee the lightest overall weight, relying on trial-and-error adjustments that lack clear optimization targets and result in non-optimal positions.
Innovation Solution
A method and system that utilize dynamics simulation software to determine end load characteristics, structural parameters, and rotational load characteristics, establishing a fixed coordinate system to calculate linear load characteristics, hydraulic cylinder parameters, and hydraulic oil source flow rates, then use a lightweight index as a fitness function to optimize hinge point positions using an optimization algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trial-and-error adjustment method is used to select hinge points, then end load requirements can be met, but the overall weight of the tandem mechanism cannot be minimized
Solution Approach 1:
The patent applies parameter changes by systematically varying the hinge point position parameters and using an optimization algorithm to find the configuration that minimizes the overall weight while satisfying end load requirements. The method transforms the trial-and-error approach into a systematic parameter optimization process where the hinge point coordinates are adjusted based on calculated criteria rather than random guessing.
Solution Approach 2:
The patent implements feedback by using dynamics simulation software to calculate the actual performance of the tandem mechanism for each proposed hinge point configuration, then using this feedback information to guide the optimization algorithm toward the optimal solution. The end load requirements serve as feedback criteria to validate whether a given configuration is acceptable.
2Weight of moving object
If hinge point position is changed to reduce mechanism weight, then overall weight decreases, but hydraulic cylinder stroke, piston diameter, and control valve size are affected
Solution Approach 1:
The patent systematically changes hinge point position parameters and calculates the corresponding changes in hydraulic system parameters (cylinder stroke, piston diameter, valve size) as part of the optimization process. By using an optimization algorithm, the method finds the hinge point position that minimizes mechanism weight while accounting for the resulting changes in hydraulic system parameters, rather than treating these as separate design concerns.
Solution Approach 2:
The patent performs preliminary calculations of all hydraulic system parameters (cylinder stroke, piston diameter, rod diameter, control valve size) for each proposed hinge point configuration before finalizing the design. This preliminary action allows the designer to understand the full impact of hinge point position changes on the entire hydraulic system before committing to a specific configuration.
3Ease of manufacture
If conventional optimization methods are used, then design process is simple, but clear optimization target is lacking and non-optimal positions are obtained
Solution Approach 1:
The patent replaces the conventional mechanical trial-and-error design process with a computational optimization system. Instead of physically building and testing multiple hinge point configurations, the method uses dynamics simulation software and an optimization algorithm to computationally determine the optimal hinge point position, achieving both design simplicity and optimization accuracy.
Solution Approach 2:
The patent creates a virtual copy or model of the tandem mechanism using dynamics simulation software, allowing the optimization process to be performed in the virtual domain rather than requiring physical prototypes. This virtual modeling approach maintains design simplicity while enabling precise optimization that would be difficult to achieve through physical experimentation alone.
Data Source
AI summary
The present invention relates to a method and system for optimizing the joint hinge point position of a hydraulic tandem mechanism based on lightweight. The method comprises: determining rotational load characteristics of each joint in the hydraulic tandem mechanism using dynamics simulation software based on said end load characteristics and said structural parameters of the tandem mechanism; establishing a fixed coordinate system between two adjacent rods in each joint and a joint global coordinate system, and determining the relationship between hinge point coordinates, joint rotation angle and joint drive force arm of each joint; calculating linear load characteristics of each joint according to said rotational load characteristics and said joint drive force arm to calculate hydraulic cylinder structural parameters and hydraulic oil source flow rate for each joint; determining a lightweight index for the joint hinge point position of the hydraulic tandem mechanism according to said hydraulic cylinder structural parameters and said hydraulic oil source flow rate; solving the coordinates of each joint hinge point of the tandem mechanism corresponding to the minimum of said lightweight index, using said lightweight index as a fitness function, so that the overall weight of the tandem mechanism is minimized.


