Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

492
Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
492
Group Design02:01

Group Design

10.6K
The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
10.6K
Optimal Foraging00:48

Optimal Foraging

13.9K
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
13.9K
Factorial Design02:01

Factorial Design

14.0K
Factorial Analysis is an experimental design that applies Analysis of Variance (ANOVA) statistical procedures to examine a change in a dependent variable due to more than one independent variable, also known as factors. Changes in worker productivity can be reasoned, for example, to be influenced by salary and other conditions, such as skill level. One way to test this hypothesis is by categorizing salary into three levels (low, moderate, and high) and skills sets into two levels (entry level...
14.0K
Vapor Pressure02:34

Vapor Pressure

40.9K
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
40.9K
Optimization Problems01:26

Optimization Problems

77
Optimization problems often involve identifying maximum or minimum values under specific constraints. A well-known example is determining the longest horizontal pipe that can be moved around a right-angled corner, where a 3-meter-wide hallway meets a 2-meter-wide hallway. This scenario, common in architectural design and industrial transport, can be understood conceptually through geometric and trigonometric reasoning.To visualize the problem, consider the pipe as a straight line that touches...
77

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

An Open-Label Randomized Controlled Non-Inferiority Trial of Arginine Glutamate Injection for the Treatment of Mild Hepatic Encephalopathy.

Journal of digestive diseases·2025
Same author

[Relationship of AM fungi with non-mycorrhizal plants.]

Ying yong sheng tai xue bao = The journal of applied ecology·2018
Same author

LC-MS/MS determination and urinary excretion study of seven alkaloids in healthy Chinese volunteers after oral administration of Shuanghua Baihe tablets.

Journal of pharmaceutical and biomedical analysis·2015
Same author

Treatment of murine lupus with PD-LIg.

Clinical immunology (Orlando, Fla.)·2015
Same author

[Preventive effects of lutein on liver toxicity in mice induced by arsenic].

Wei sheng yan jiu = Journal of hygiene research·2015
Same author

The Dynamic Genome and Transcriptome of the Human Fungal Pathogen Blastomyces and Close Relative Emmonsia.

PLoS genetics·2015

Related Experiment Video

Updated: Feb 7, 2026

Modified Drop Tower Impact Tests for American Football Helmets
07:08

Modified Drop Tower Impact Tests for American Football Helmets

Published on: February 19, 2017

11.5K

Optimal pressure comfort design for pilot helmets.

Ying Xu1, Lian Yun Chen2, Hai Bo Zhang2

  • 1a School of Biological Science and Medical Engineering , Beihang University , Beijing , China.

Computer Methods in Biomechanics and Biomedical Engineering
|July 17, 2018
PubMed
Summary

Pilot helmet design is optimized for high-G environments. New material combinations ensure eye position stability and comfortable pressure distribution, crucial for advanced helmet-mounted displays (HMDs).

Keywords:
Helmetfinite element analysisoptimal designpressure comfort

More Related Videos

Design and Optimization Strategies of a High-Performance Vented Box
14:23

Design and Optimization Strategies of a High-Performance Vented Box

Published on: June 9, 2023

1.6K
Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches
10:58

Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches

Published on: July 22, 2025

669

Related Experiment Videos

Last Updated: Feb 7, 2026

Modified Drop Tower Impact Tests for American Football Helmets
07:08

Modified Drop Tower Impact Tests for American Football Helmets

Published on: February 19, 2017

11.5K
Design and Optimization Strategies of a High-Performance Vented Box
14:23

Design and Optimization Strategies of a High-Performance Vented Box

Published on: June 9, 2023

1.6K
Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches
10:58

Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches

Published on: July 22, 2025

669

Area of Science:

  • Aerospace Engineering
  • Biomechanics
  • Materials Science

Background:

  • Pilot helmets are evolving with high-performance aircraft.
  • Helmet-mounted displays (HMDs) are a key future technology.
  • Balancing eye position control and comfort under high G-forces is challenging.

Purpose of the Study:

  • To optimize pilot helmet design for high-G conditions.
  • To address the conflict between eye position maintenance and pressure comfort.
  • To develop a head-helmet finite element model for design optimization.

Main Methods:

  • A head-helmet finite element model was constructed.
  • Material combinations were tested for 46 different configurations.
  • Performance was evaluated based on deformation limits (≤2mm at 10G) and pressure distribution (2:2:1:3 front:top:side:back).

Main Results:

  • Optimal material selection ensures helmet soft liner deformation does not exceed 2mm under 10G.
  • A specific combination of linear elastic materials (1000 Pa, 55000 Pa, 65000 Pa) and nonlinear hyperfoam meets comfort pressure requirements.
  • The optimized design satisfies both eye position stability and comfortable head pressure distribution.

Conclusions:

  • The study successfully optimized pilot helmet design for demanding flight conditions.
  • Specific material properties and placement are critical for achieving dual performance objectives.
  • This research contributes to the development of advanced, comfortable, and functional pilot helmets with integrated HMDs.