相关实验视频

Updated: Jul 9, 2025

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
07:30

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact

Published on: September 21, 2017

9.0K

球形帽杆:一种新的速度阻塞替代方案,可以通过有效的减速减速来减少不适

Nainesh Advani1, Het Danak1, Manish Dutta1

  • 1Department of Civil Engineering, Nirma University, Ahmedabad, India.

Traffic injury prevention
|December 6, 2023
PubMed
概括

球形帽 (SCS) 有效地降低了两轮车的速度,类似于传统的减速. 然而,SCS通过减少12.8%的振动剂量值和45.57%的静态压力压力来显著降低骑手的不适.

关键词:
球形的帽子钉是球形的.这是一种不适的感觉,不适的感觉.伤害伤害伤害伤害伤害伤害伤害伤害伤害速度减速器的速度减速器速度冲撞撞撞撞撞撞撞撞撞撞撞撞撞撞撞超速驾驶员可能会超速.脊椎损伤的原因是什么?静态的压力压力应力.交通平静,使交通更加平静.振动剂量值的振动剂量值是什么

更多相关视频

Modified Drop Tower Impact Tests for American Football Helmets07:08

Modified Drop Tower Impact Tests for American Football Helmets

Published on: February 19, 2017

11.0K
Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes06:34

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes

Published on: January 6, 2023

1.6K

相关概念视频

Dynamics Of Circular Motion: Applications01:17

Dynamics Of Circular Motion: Applications

Suppose a car moves on flat ground and turns to the left. The centripetal force causing the car to turn in a circular path is due to friction between the tires and the road. For this, a minimum coefficient of friction is needed, or the car will move in a larger-radius curve and leave the roadway. Let's now consider banked curves, where the slope of the road helps in negotiating the curve. The greater the angle of the curve, the faster one can take the curve. It is common for race tracks for...
7.8K
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
180
Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
1.2K
Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
120
Screw: Problem Solving01:21

Screw: Problem Solving

In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
419
Bearings: Problem Solving01:24

Bearings: Problem Solving

Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...
285