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Consider a man with a mass of 70 kg seated in a chair connected to a pin support through a member BC. If the man maintains an upright position, the task is to determine the horizontal and vertical reactions of the chair on the man when the member makes a 45° angle with the horizontal. At this moment, the man has a speed of 5 m/s, increasing at a rate of 1 m/s².
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Design Example: Application of Archimedes' Principle01:11

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Archimedes' principle is fundamental in analyzing the buoyant force and stability of floating bodies. In this example, a wooden block with a rectangular section floats in seawater. Based on the block's dimensions, its specific gravity and the specific weight of seawater are used to find the volume of water displaced and the center of buoyancy.
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Design Consideration01:22

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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Design Example: Designing Water Slide01:18

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When designing a water slide, controlling the speed of water flow is crucial for rider safety while maintaining an exciting experience. As water flows down the slide, gravity causes it to accelerate, with its speed at the bottom depending on the height from which it starts. The higher the slide, the more potential energy the water has at the top, which is converted into kinetic energy as it descends, increasing its speed.
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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Design Example: Dimensioning of Concrete Masonry Construction01:13

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Related Experiment Video

Updated: Aug 9, 2025

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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Chair Size Design Based on User Height.

Maciej Sydor1, Miloš Hitka2

  • 1Department of Woodworking and Fundamentals of Machine Design, Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland.

Biomimetics (Basel, Switzerland)
|February 22, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a new method for designing chairs using only user height ranges, overcoming outdated anthropometric data limitations. This approach ensures comfortable seating for a wider population by linking chair dimensions to human height.

Keywords:
anthropometrychairsfurniture designlumbar supportseat depthseat heightseat width

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Area of Science:

  • Ergonomics and Human Factors
  • Anthropometry
  • Product Design

Background:

  • Current anthropometric data for chair design is often outdated or incomplete.
  • Existing chair designs may not accommodate diverse user populations effectively.
  • Adjustable chairs, while common, are unsuitable for universal public spaces.

Purpose of the Study:

  • To develop a novel method for determining optimal chair dimensions.
  • To base chair design parameters solely on user height range.
  • To address the limitations of existing anthropometric data in furniture design.

Main Methods:

  • Assigning key chair dimensions to relevant anthropometric measurements.
  • Utilizing literature data to establish relationships between body size and chair features.
  • Developing seven equations linking chair dimensions to human height or height ranges.

Main Results:

  • A method for designing chairs based on user height range was established.
  • The method overcomes issues of outdated and incomplete anthropometric data.
  • Calculated average body proportions for adults were used to link design to height.

Conclusions:

  • The proposed method enables the design of functional chairs tailored to specific user height ranges.
  • This approach simplifies the design process by relying on a single, accessible anthropometric parameter: human height.
  • The method is applicable to standard adult body proportions, excluding children, adolescents, seniors, and individuals with a BMI over 30.