描述混合III和NOCSAE头型的自然频率
Kristin J Dingelstedt1, Steve Rowson2
1Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA, 24060, USA. kdingelstedt@vt.edu.
Annals of biomedical engineering
|April 1, 2024
概括
与混合III不同,NOCSAE头型表现出较低的自然频率 (812 Hz),更接近人类头部反应. 这对于准确评估短期冲击中头部损伤风险至关重要.
科学领域:
- 生物力学 生物力学
- 伤害生物力学 伤害生物力学
- 实验力学 实验力学 实验力学
背景情况:
- 混合III和NOCSAE头型的振动特性尚未得到充分了解.
- 结构上的差异可能导致不同负载环境中的不同频率响应.
- 短期影响激发的频率范围比长期影响更广.
研究的目的:
- 为了确定混合III和NOCSAE头型的自然频率.
- 为了将这些头形的振动响应与人类头部数据进行比较.
- 评估头形状振动特征对头部损伤风险评估的相关性.
主要方法:
- 使用了实验性模式分析技术.
- 一个冲动子被用来激发两个头形类型的各种位置.
- 分析频率响应函数以确定第一个自然频率.
主要成果:
- NOCSAE头形的平均第一个自然频率为812 Hz.
- 混合型III头形显示没有自然频率低于1000赫兹.
- NOCSAE头型的振动响应与人类头部数据更加一致.
结论:
- NOCSAE头形的较低的自然频率更能代表人类的头部.
- 这一发现对头部损伤风险评估具有重要意义,特别是在短期影响方面.
- 短时间冲击中的共振频率可以影响动力学测量和伤害结果.
相关概念视频
Resonance and Hybrid Structures
16.9K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
16.9K
Resonance
54.2K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
54.2K
Concept of Resonance and its Characteristics
5.0K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
5.0K
Sound Waves: Resonance
2.6K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.6K
Modes of Standing Waves - I
2.9K
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
2.9K
Design Example: Underdamped Parallel RLC Circuit
288
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
Starting with a fixed...
288


