Dynamic Force Machine Parameter Test Assembly
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Solution Overview
Problem
Existing methods for determining machine parameters are inflexible, time-consuming, and difficult to assess a machine's characteristics under load, especially when comparing results from different tests or measuring machine performance in operation.
Innovation Solution
A method and assembly that apply a predetermined force with a dynamically varying portion between movable elements, using a measuring arm to record the actual movement path and derive machine parameters such as stiffness, hysteresis, and damping, with the force varying sinusoidally or according to an analytic function, and generated by actuators like piezo or hydraulic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional test pieces and tools are used to test machine performance, then manufacturing precision can be assessed, but the method requires multiple tools and test pieces and is difficult to compare results from different tests
Solution Approach 1:
The patent applies universality by creating a single standardized test piece with multiple functional features that can assess various machine parameters (rectilinearity, circularity, perpendicularity, parallelism) without requiring multiple different test pieces or tools. The test piece includes a reference surface, reference axis, and multiple measurement features that serve different testing purposes simultaneously.
2Measurement precision
If rigidity monitoring is done by applying force with a hydraulic cylinder and measuring deflection with a micrometer, then machine rigidity can be measured, but the method is time-consuming and cannot be done with the machine in operation
Solution Approach 1:
The patent applies self-service by enabling the machine to perform its own rigidity and accuracy self-assessment through the standardized test piece. The machine's own measurement systems (encoders, lasers, micrometers) are used to measure the test piece's known features, allowing the machine to self-diagnose its performance without external testing equipment or machine shutdown.
Solution Approach 2:
The patent enables continuous measurement by allowing tests to be performed while the machine remains in operation. The standardized test piece can be quickly positioned and measured during production cycles, and the automated measurement process continues without interrupting the machine's productive function.
3Measurement precision
If a ball bar is used to test circular movement ability, then machine characteristics can be assessed, but it is not easy to gain a proper assessment of the machine's characteristics under load
Solution Approach 1:
The patent applies preliminary action by pre-configuring the test piece with known reference features (exact dimensions, precise geometries) before installation. The reference surface and reference axis are established in advance, allowing the machine's measurement systems to compare actual performance against predetermined standards, enabling accurate load condition assessment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables more flexible and accurate determination of machine parameters, allowing for improved assessment of machine condition and performance under varying loads, enhancing precision and reducing the need for multiple test pieces and tools, and facilitating real-time monitoring.
Implementation Method 1
the dynamically varying portion is generated at least partially by means of a piezo actuator
Implementation Method 2
it is generated at least partially by means of a hydraulic actuator
Implementation Method 3
recording the resulting actual movement path by means of the measuring arm
Data Source
AI summary
The invention pertains to a method for determining machine parameters of a mechanical device in which a first element and a second element are mutually movable in settable patterns of movement, the method comprising placing a measuring arm between the first and second elements, displacing the first and second elements mutually in a predetermined intended movement path, applying a predetermined force between the first element and the second element substantially in the longitudinal direction of the measuring arm, recording the resulting actual movement path by means of the measuring arm, thereby determining a difference between the intended movement path and the actual movement path, and deriving, based on the determined difference, machine parameters indicating a condition of the mechanical device, characterized in that the predetermined force comprises a dynamically varying portion. The invention furthermore pertains to a test assembly for performing said method.