Angular Acceleration Detection Device with Aligned Gravity Center
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Solution Overview
Problem
Existing angular acceleration detection devices face challenges in achieving high detection accuracy and sensitivity due to the limitations imposed by the number and arrangement of support beams, which affect rotational balance and stress distribution, leading to increased noise and decreased detection accuracy.
Innovation Solution
The angular acceleration detection device is designed with a reduced number of support beams, where the rotating weight's gravity center is aligned with a single support beam or a neutral plane formed by multiple support beams, increasing the moment of inertia and allowing for a fatter, shorter support beam configuration, thereby enhancing detection sensitivity and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple support beams are used to bear distributed inertial force, then rotational balance is improved, but stress generated in each support beam per unit of angular acceleration decreases, degrading detection accuracy
Solution Approach 1:
The patent applies asymmetry by positioning the gravity center of the rotating weight asymmetrically relative to the support beam structure. Specifically, the gravity center is positioned at a distance from the support beam, creating an unbalanced configuration that generates sufficient stress for detection while maintaining rotational balance through careful design of the rotating weight's mass distribution.
Solution Approach 2:
The patent changes the geometric parameters of the support beam, making it thinner and longer compared to conventional designs. This parameter change allows the beam to be more compliant, generating higher stress per unit of angular acceleration even with fewer beams, thereby improving detection accuracy while maintaining rotational balance.
2Measurement precision
If the number of support beams is reduced to increase stress per beam, then detection accuracy is improved, but rotational balance becomes difficult to ensure
Solution Approach 1:
The patent uses asymmetric positioning of the gravity center relative to the support beam to achieve rotational balance with a reduced number of beams. The gravity center is positioned at a specific offset distance, creating a configuration that maintains balance while allowing fewer beams to bear the inertial force, thereby increasing stress and detection accuracy.
Solution Approach 2:
The patent modifies the geometric parameters of the support beam (making it thinner and longer) to increase its compliance. This allows the beam to generate sufficient stress for accurate detection even with fewer beams, while the asymmetric gravity center positioning ensures rotational balance is maintained.
3Measurement precision
If support beams are made thinner and longer to increase stress sensitivity, then detection sensitivity is improved, but the device size increases
Solution Approach 1:
The patent positions the gravity center at a distance from the support beam in the horizontal direction, creating a lever arm effect. This dimensional arrangement allows the use of thinner, longer beams for increased sensitivity without proportionally increasing the overall device volume, as the sensitivity enhancement comes from the beam's geometric properties rather than its size.
Solution Approach 2:
The patent optimizes the geometric parameters of the support beam (thickness and length) to achieve high detection sensitivity. By carefully selecting these parameters, the beam becomes more compliant and generates higher stress for a given angular acceleration, improving sensitivity while controlling the device's overall size through efficient use of space.
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
This configuration ensures rotational balance, increases detection sensitivity, and reduces the device's size and cost while maintaining high accuracy by concentrating rotational inertial forces effectively on the support beam, resulting in improved stress distribution and noise reduction.
Implementation Method 1
the rotating weight is rotated (oscillated) with respect to the fixed portion by the action of a rotational inertial force generated upon application of the angular acceleration
Implementation Method 2
The support beam is deformed with the rotation of the rotating weight, whereupon the detection portion detects stress generated in the support beam
Implementation Method 3
the detection portion detects stress generated in the support beam. Because the stress generated in the support beam changes depending on the angular acceleration acting on the rotating weight about the detection axis, the angular acceleration about the detection axis can be measured from a signal detected by the detection portion
Data Source
AI summary
An angular acceleration detection device includes a rotating weight, a fixed portion, a support beam, and a detection portion. The rotating weight is rotatable about a Z-axis with respect to the fixed portion by action of an inertial force generated by an angular acceleration about the Z-axis. The fixed portion is disposed at a position spaced from the rotating weight. The support beam is disposed in an X-Y plane between the fixed portion and the rotating weight, the support beam elastically supporting the rotating weight with respect to the fixed portion. The detection portion outputs a detection signal corresponding to stress generated in the support beam. A gravity center position of the rotating weight is aligned with the support beam when viewed in a Z-axis direction.