Dual-Accelerometer Pendulum Sensor for Tilt and Acceleration Separation
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Solution Overview
Problem
Existing motion sensors cannot accurately measure tilt and horizontal acceleration simultaneously due to interference between the two signals in dynamic environments, such as moving vehicles, where acceleration can mimic tilt and vice versa.
Innovation Solution
A motion-sensing device comprising two accelerometers and a pendulum system, where one accelerometer measures mixed signals and the other isolates linear horizontal acceleration, allowing for separation of tilt and acceleration components in a dynamic environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single accelerometer or tilt sensor is used, then the device structure is simple, but it cannot distinguish between tilt and acceleration signals in dynamic environments
Solution Approach 1:
The patent divides the measurement function into two separate sensors: a tilt sensor for measuring inclination angles and an accelerometer for measuring horizontal acceleration. This segmentation allows each sensor to specialize in one type of measurement, eliminating cross-interference and enabling accurate separate measurement of tilt and acceleration signals in dynamic environments.
Solution Approach 2:
The patent introduces a signal processing system as an intermediary that receives outputs from both the tilt sensor and accelerometer, applies correction algorithms, and separates the mixed signals. This intermediary processing layer reconciles the measurements from both sensors and produces accurate separate tilt and acceleration values.
2Adaptability or versatility
If traditional tilt sensors or accelerometers are used in moving vehicles, then they can measure either tilt or acceleration, but they cannot measure both concurrently due to signal interference
Solution Approach 1:
The patent combines a tilt sensor and an accelerometer into a single motion sensing device that measures both tilt and acceleration concurrently. By merging these two sensors and coordinating their measurements through signal processing, the system achieves versatile concurrent measurement capability while maintaining precision through corrective algorithms.
Solution Approach 2:
The patent changes the measurement parameters by using a tilt sensor that measures gravitational component for tilt angle while simultaneously using an accelerometer to measure horizontal acceleration component. By separating the measurement parameters into orthogonal components (vertical gravitational vs. horizontal inertial), the system enables concurrent measurement without cross-interference.
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 precise measurement of both tilt and acceleration separately even when occurring concurrently, improving accuracy in dynamic environments and enabling calculation of additional parameters like linear speed and distance.
Implementation Method 1
The pendulum is hung on the substrate vertically and can rotate freely in a single geometric plane, preferably in critically damping fluid in a gravitational field. As a result of being in free rotation, the arm of the pendulum is always parallel with the gravitational direction when the substrate is tilted either if there is an additional linear acceleration or no additional linear acceleration.
Implementation Method 2
The pendulum is hung on the substrate vertically and can rotate freely in a single geometric plane, preferably in critically damping fluid in a gravitational field.
Implementation Method 3
The first accelerometer senses the mixed signals generated by both tilt and linear horizontal acceleration without distinguishing the two components. The second accelerometer is able to only measure the linear horizontal acceleration without the interference from tilt.
Data Source
AI summary
A motion-sensing device for sensing tilt and acceleration when either tilt, horizontal acceleration, or tilt and horizontal acceleration acting concurrently, influence the device, including: a substrate having a vertical surface, a first accelerometer fixed to the vertical surface of the substrate; a pendulum flexibly coupled to the substrate proximate to the first accelerometer; and a second accelerometer fixed to the pendulum. The first and/or second accelerometers are preferably an accelerometer; a spring-mass system; and/or any tilt or accelerometer sensitive elements. The first accelerometer includes an accelerometer that measures tilt and linear acceleration in a first geometric plane, the pendulum is constrained to move in the first geometric plane, and the second accelerometer is operable to measure linear acceleration in the first geometric plane. The motion-sensing device or devices coupled to a machine, vehicle, and/or a control system. The pendulum is critically damped using a damping fluid.