将一个活塞-气尺寸数据集转换为机械压力发生器的有效面积
Patrick F Egan1, Eric S Stanfield1, John R Stoup1
1National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, United States of America.
概括
在NIST的先进计量技术精确地测量了活塞-圆柱体组件 (PCA). 这使得通过将精确的直径测量转换为有效面积,准确地确定压力,从而验证PCA模型.
科学领域:
- 计量学 计量学 计量学
- 机械工程 机械工程
- 压力计量学 压力计量
背景情况:
- 活塞-气组件 (PCA) 对于压力产生至关重要.
- 准确地描述PCA尺寸对于精确的压力测定至关重要.
- 以前的方法缺乏高级PCA应用所需的精度.
研究的目的:
- 详细说明使用高精度维度数据确定特定PCA (PCA2062) 所产生的压力的过程.
- 为了验证尺寸测量和由此产生的有效面积计算.
- 评估PCA模型的线性,可重现性和不确定性.
主要方法:
- 在NIST利用先进的直径计量技术,获得外径和内径的高精度测量.
- 将维度数据 (直径,直度,圆度) 转换为有效面积和扭曲系数.
- 与实验观测相比,计算的落下率和旋转衰变与实验观测相比.
- 进行了与激光气压计进行比较的测试.
主要成果:
- 获得了12nm (外径) 和14nm (内径) 的标准不确定性.
- 对PCA2062的有效面积测量在0.2 × 10−6 A0.0内重复.
- 计算的间隙宽度在 (36 ± 42) nm内验证,不确定性受流量理论的影响.
- PCA2062在0.2微帕Pa−1.1的范围内证明了线性和可重复性.
结论:
- 高精度的维度计量技术使PCA的有效面积能够精确地确定.
- 经过验证的PCA模型与实验数据保持一致.
- 直径测量是有效面积不确定性的主要贡献者.
- 需要对流量模型进行进一步的研究,以便在更高的压力下准确评估扭曲系数.
更多相关视频
09:04A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
Published on: June 1, 2022
3.0K
06:45Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
Published on: October 28, 2022
1.6K
相关概念视频
Application of Pascal's Law
8.1K
Pascal's experimentally proven observations—that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid and to the walls of its container—provide the foundations for hydraulics, one of the most important developments in modern mechanical technology.
Hydraulic systems are used to operate automotive brakes, hydraulic jacks, and numerous other mechanical systems. We can derive a relationship between the forces in a simple hydraulic system...
Hydraulic systems are used to operate automotive brakes, hydraulic jacks, and numerous other mechanical systems. We can derive a relationship between the forces in a simple hydraulic system...
8.1K
Fluid Pressure over Flat Plate of Variable Width
1.4K
When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
1.4K
Fluid Pressure
583
In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...
583
Work Done in an Adiabatic Process
3.1K
Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 x 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that, in the actual operation of an automobile engine, the compression is not...
3.1K
Path Between Thermodynamics States
3.1K
Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
3.1K
Concept of Pressure at a Point
215
The concept of pressure at a point in a fluid establishes that pressure within a fluid is uniform in all directions at a specific location. This uniformity occurs because fluid molecules exert force evenly across any point due to their random motion and continuous collisions within the fluid. Pressure at a point is determined by the surrounding fluid molecules and is influenced by factors like depth and density, rather than by shape or orientation.
In a fluid at rest, pressure acts equally in...
In a fluid at rest, pressure acts equally in...
215
