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Related Concept Videos

Adjusting a Traverse01:12

Adjusting a Traverse

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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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Angle of Twist: Problem Solving01:13

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Design Example: Traverse Angle Computations01:25

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Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
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Camber Angle Inspection for Vehicle Wheel Alignments.

Jieh-Shian Young1, Hong-Yi Hsu2, Chih-Yuan Chuang3

  • 1Institute of Vehicle Engineering, National Changhua University of Education, Changhua County 50007, Taiwan. jsyoung@cc.ncue.edu.tw.

Sensors (Basel, Switzerland)
|February 7, 2017
PubMed
Summary

This study presents a new micro-control-unit (MCU)-based system using a 3-axis accelerometer for precise vehicle camber angle measurement. The approach offers high accuracy (±0.015°) and flexible data transmission, simplifying wheel alignment inspections.

Keywords:
accelerometercamber anglecoordinate transformationwheel alignment

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Area of Science:

  • Automotive Engineering
  • Metrology
  • Sensor Technology

Background:

  • Current vehicle wheel alignment systems often rely on complex computer vision techniques for camber angle measurement.
  • Existing methods can be susceptible to environmental factors and require precise alignment of measurement tools.
  • There is a need for a more robust, accurate, and user-friendly system for camber angle inspection.

Purpose of the Study:

  • To introduce an alternative, MCU-based approach for camber angle measurement in vehicle wheel alignment.
  • To develop and validate a system utilizing a 3-axis accelerometer for precise camber inspection.
  • To address and calibrate potential axis misalignments inherent in accelerometer-based systems.

Main Methods:

  • Development of a micro-control-unit (MCU) based inspection system incorporating a 3-axis accelerometer.
  • Analysis of system precision considering accelerometer axis misalignments.
  • Proposal and implementation of calibration methods to correct for axis misalignments during fabrication.
  • Conducting authentic camber angle measurements without requiring perfect alignment of system and wheel axes.

Main Results:

  • The proposed MCU-based system achieves a high precision of ±0.015° for camber angle measurements.
  • Calibration techniques effectively amend axis misalignments between the accelerometer and the inspection system.
  • The system demonstrated applicability in real-world camber angle measurements.
  • Measured camber angle data can be transmitted wirelessly (Bluetooth, Wi-Fi) or via serial communication (RS232).

Conclusions:

  • The developed MCU-based 3-axis accelerometer system provides a precise and applicable alternative for vehicle camber angle measurement.
  • The proposed calibration methods enhance the system's robustness against fabrication imperfections.
  • This approach simplifies the camber measurement process without compromising accuracy and allows for versatile data transmission.