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Shake-the Box 高空间分辨体视粒子跟踪测速
核心参数
测量效果： 立体（3D3C）
产地类别： 进口
测量频率： 高频（100 HZ以上）
测速范围： 0-1000m/s
测定准确度： 1%
测量区域大小： 1000mm*1000mm*1000mm
FlowMaster 4D-PTV / Shake-the-Box
Shake-the-Box is the most advanced 3D Lagrangian Particle Tracking Velocimetry (PTV) method for densely seeded flows at highest spatial resolution. Compared to the voxel-based Tomo-PIV approach Shake-the-Box is a purely particle-based technique using an Iterative Particle Reconstruction (IPR) technique in combination with an advanced 4D-PTV algorithm using the time-information for track reconstruction. Shake-the-Box achieves a higher reconstruction accuracy at much faster processing speed compared with its TR-Tomo-PIV counterpart.
Beside different DaVis software packages FlowMaster systems for TR-Tomo-PIV and Shake-the-Box are using the same hardware.
time-resolved PTV for 4D flow analysis at high seeding densities
award-winning particle reconstruction and tracking algorithm:
4th International PIV Challengeunsurpassed precision for velocity and acceleration of particle tracks
very fast processing speed
hardware compatible with FlowMaster TR-Tomo-PIV setups
MiniShaker: compact 3D camera for volumetric flow measurements
The MiniShaker is an aligned multi-sensor system in a compact housing for quick and easy volumetric flow measurements. Integrated into LaVision’s DaVis software, Shake-the-Box (4D-PTV) as well as Tomographic PIV flow fields are readily obtained. The power supply and data transfer of the system both use USB-3 interfaces largely simplifying installation and operation.
The MiniShaker is available in three models and with adaptable lenses for diverse measurement tasks. In combination with LaVision’s cost-effective LED-Flashlight it is ideal for measurements of water applications. Mounted to a robotic arm and combined with Helium-filled Soap Bubble seeding, the flexible system is most appropriate for large-scale flow analysis of low- to mid-speed wind tunnel and convective air flow applications.
courtesy DLR Goettingen
Large Scale PIV/PTV in air
Air seeding with μm-particles is not suitable for large scale PIV/PTV experiments due to their limited scattering power. Neutrally buoyant Helium-filled Soap Bubbles (HFSB) with a diameter of 0.3 mm and a response time less than 15 μs scatter 10000x more light than μm-particles and, therefore, are suitable for large scale PIV/PTV experiments in the lower subsonic regime.
LaVision’s HFSB Seeding Generator can deliver 0.3 mm mono-sized bubbles at a production rate of 40000 bubbles per second and per nozzle and can operate simultaneously up to 60 nozzles in parallel. The typical life time of the Helium-filled soap bubbles is a few minutes. Furthermore, the increased scattering intensity allows to switch from laser to LED illumination, greatly reducing the cost of the light source.
Time-Resolved 3D Flow Field Imaging in a Wind Tunnel for Full Scale Automotive Testing
Time-resolved 3D flow fields have been successfully measured behind a serial car in a large wind tunnel at Volkswagen. The field-of-view was 2 m x 1.6 m with a light sheet thickness of 0.2 m. The air flow was seeded with 0.3 mm in diameter Helium-filled soap bubbles applying seeding rates of more than 2 million bubbles per second operating 60 seeding nozzles.
Four high-speed cameras recorded the 3D wake flow at wind speeds of 60 km/h and 120 km/h, respectively. A high-speed laser was used for illumination. LaVision’s Shake-the-Box time-resolved 3D-PTV technique was applied to calculate the time-resolved 3D flow fields.
Product Information
3D Particle Tracking
Time-Resolved 3D-PTV: ?Shake-the-Box“
MiniShaker 3D cameras
Helium-filled Soap Bubble Seeder LaVision GmbH粒子图像测速FlowMaster 4D-PTV的工作原理介绍
粒子图像测速FlowMaster 4D-PTV的使用方法?
LaVision GmbHFlowMaster 4D-PTV多少钱一台?
粒子图像测速FlowMaster 4D-PTV可以检测什么？
粒子图像测速FlowMaster 4D-PTV使用的注意事项？
LaVision GmbHFlowMaster 4D-PTV的说明书有吗？
LaVision GmbH粒子图像测速FlowMaster 4D-PTV的操作规程有吗？
LaVision GmbH粒子图像测速FlowMaster 4D-PTV报价含票含运吗？
LaVision GmbHFlowMaster 4D-PTV有现货吗？
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3D拉格朗日粒子追踪测速
在过去几十年中，已经发展出了多种基于粒子图像的体积流场测量技术，这些技术已经在流体力学的各种实验应用中展示了它们量化评估非定常流动性质的潜力。在这篇综述中，我们专注于3D基于粒子的测量的物理特性和环境，以及可以用于提高重建精度、空间和时间分辨率以及完整性的知识。我们关注的自然候选者是3D拉格朗日粒子跟踪（LPT），它允许在所研究的体积中确定位置、速度和加速度以及大量单个粒子轨迹。过去十年中，密集的3D LPT技术“Shake-The-Box”的出现开辟了更多的可能性，通过提供用于使用Navier-Stokes约束的强大数据同化技术的输入数据来表征非定常流动。因此，可以获得高分辨率的拉格朗日和欧拉数据，包括嵌入时间分辨的3D速度和压力场中的长粒子轨迹。
航空航天
2023/04/10
拉格朗日粒子跟踪测速技术研究水下振荡重球摆的漩涡屏障拓扑结构
使用时间分辨三维颗粒轨迹测速术(tr-3-D-PTV)研究在密度流体中振荡的重质量摆的涡 shedding 拓扑结构。实验系列涉及八个不同的固体到流体质量比 m∗ 在[1.14,14.95]范围内，并对应雷诺数高达Re∼O(104)。摆的振荡周期严重依赖于m∗。幅度衰减和振荡频率之间的关系是非单调的，在m∗≈2.50时有最佳阻尼效果。此外，实现了一种使用涡量幅值等值面的数字物体跟踪(DOT)方法来分析涡旋结构。对于各种质量比 m∗，观察到类似的涡 shedding 拓扑结构。我们的观察结果表明，首先，在摆的尾迹中形成了一个涡环。不久之后，初始涡环分解成两个明显可区分的大小相似的结构。其中一个涡旋留在摆的圆形路径上，而另一个涡旋则分离、向下传播，并最终消散。第一个涡旋的 shedding 时间和其初始传播速度取决于 m∗ 和球形重物赋予的动量。研究结果还表明，在 Strouhal 数基础上的理论涡 shedding 时间尺度与实验确定的涡 shedding 频率有很好的一致性。
航空航天
2023/04/10
企业名称
北京欧兰科技发展有限公司
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信用代码
110108003886158
成立日期
2002-06-14
注册资本
50000
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