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公开(公告)号：US5307688A
公开(公告)日：1994-05-03
申请号：US632872
申请日：1990-12-24
申请人： Paul J. Lefebvre
发明人： Paul J. Lefebvre
IPC分类号： G01F1/60
CPC分类号： G01F1/60
摘要： An electromagnetic flowmeter and a method for measurement of the rate of flow of a fluid under unsteady conditions are described. It uses fluid steady-state flowmeter technology and a new algorithm to measure transient rate of flow of a fluid such as water. The algorithm teaches (a) measuring the e.m.f. generated due to the rate of flow of the fluid under test moving through a tube placed in an area with uniform magnetic flux, and (b) comparing it to a simultaneously generated reference signal which is measure of the magnetic flux density generated when an electromagnetic flowmeter is energized due to the fluid flow rate at the instant of taking the flow rate data of the fluid.
摘要翻译： 描述了电磁流量计和用于在不稳定条件下测量流体流量的方法。 它使用流体稳态流量计技术和一种新的算法来测量流体如水的瞬态流量。 该算法教导（a）测量e.m.f. 由于被测流体的流动通过放置在具有均匀磁通量的区域中的管道而产生，并且（b）将其与同时产生的参考信号进行比较，该参考信号是当电磁流量计 由于在获取流体的流量数据的瞬间的流体流量而被激活。
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公开(公告)号：US5205162A
公开(公告)日：1993-04-27
申请号：US956326
申请日：1992-10-05
申请人： Paul J. Lefebvre , John A. Schwemin
发明人： Paul J. Lefebvre , John A. Schwemin
摘要： A facility for permitting launch performance tests to be conducted on an erwater vehicle, such as a torpedo, includes a housing having an opening therethrough defining a tubular chamber for receiving a vehicle therein. A piston is also positioned within the tubular chamber. A link disposed between the piston and the vehicle has a pair of opposing end portions connected with the piston and the vehicle, respectively. A channel is positioned adjacent to the housing and has water flowing therein at a predetermined velocity. The water within the channel communicates with the tubular chamber to allow water flowing within the channel to enter the tubular chamber and surround the vehicle with the vehicle at its rest position. A drive device is operable to move the piston through the tubular chamber a preselected distance sufficient to move the vehicle and the water surrounding the vehicle out of the tubular chamber and into the channel. The link is connected with the piston and the vehicle to permit the vehicle to move both laterally and in rotational fashion within the tubular chamber with the vehicle at its rest position and as the vehicle moves through the tubular chamber in response to hydrodynamic forces acting on the vehicle generated by the flowing channel water and also to stop the advancement of the vehicle after the piston has moved its preselected distance.
摘要翻译： 用于允许在诸如鱼雷的水下航行器上进行发射性能测试的设施包括具有开口的壳体，其中限定了用于在其中接收车辆的管状室。 活塞也位于管状室内。 设置在活塞和车辆之间的连杆分别具有与活塞和车辆连接的一对相对端部。 通道邻近壳体定位，并且具有以预定速度流过其中的水。 通道内的水与管状室连通，以允许水流在通道内进入管状室，并且在车辆处于静止位置时围绕车辆。 驱动装置可操作以将活塞通过管状室移动到足以使车辆和车辆周围的水从管状腔室移出并进入通道的预选距离。 该连杆与活塞和车辆连接，以允许车辆在管状室内以横向和旋转的方式移动，同时车辆处于其静止位置，并且当车辆响应于作用在该腔室上的流体动力而移动通过管状腔室时 通过流动通道水产生的车辆，并且还在活塞已经移动其预选距离之后停止车辆的前进。
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公开(公告)号：US5231883A
公开(公告)日：1993-08-03
申请号：US632707
申请日：1990-12-24
CPC分类号： G01F1/72 , G01F1/007 , G01F1/58 , G01F25/0038
摘要： An apparatus for defining the free surface of a moving column of a fluid in vertical pipe to enhance the accuracy of measurements of transient rate of flow of the fluid using electromagnetic flowmeter is described. It provides a neutrally buoyant plug which stays in contact with the free surface of the column of the fluid at all times and thus defines the free surface of the fluid moving in the vertical pipe accurately and reduces the oscillations of the free surface of the fluid.
摘要翻译： 描述了一种用于限定垂直管中的流体的移动柱的自由表面的装置，以使用电磁流量计提高流体的瞬时流速的测量精度。 它提供了一种中性浮力塞，其始终与流体柱的自由表面接触，并因此限定了在垂直管中移动的流体的自由表面，并且减少了流体的自由表面的振荡。
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公开(公告)号：US4380935A
公开(公告)日：1983-04-26
申请号：US236416
申请日：1981-02-20
CPC分类号： G01P5/01
摘要： A vortex-sensing fluid flowmeter has a freely rotatable vortex-shedding body suspended in a section of conduit through which a fluid stream passes, the body being oriented generally transverse to the direction of fluid flow. The body has an integrally formed upstream-facing portion adapted to shed a series of vortices within the fluid, which vortices alternately influence opposite lateral faces of the body, tending to produce a periodic rotation of the body about a firmly attached rotational shaft. The shaft is rotatably mounted to the conduit and passes at one end through the wall of the conduit to the exterior thereof. A sleeve-like tube surrounds the shaft and is fastened tightly at its bottom end to the shaft and at its top end to the conduit wall to provide a fluid-tight seal around the shaft. The tube is sufficiently flexible and pliable to exert negligible restraining force against the rotation of the shaft. A sensing device located outside of the fluid stream and coupled to the externally protruding portion of the shaft exerts a predetermined restraint on the shaft. This restraint limits the maximum rotation of the shaft at high flow rates, for minimizing the fatiguing stress exerted on the sealing tube, yet does not impede rotation at low flow rates. The sensing device responds to the restrained rotations of the shaft, and electronic circuitry associated with the sensing device converts the response to a signal output indicative of the flow rate of the fluid.
摘要翻译： 涡流感测流体流量计具有悬挂在流体流通过的管道部分中的可自由旋转的涡流脱落体，主体通常横向于流体流动的方向定向。 主体具有整体形成的上游侧部分，其适于在流体内流出一系列涡流，涡流交替地影响身体的相对侧面，倾向于产生身体围绕牢固附着的旋转轴的周期性旋转。 轴可旋转地安装到导管，并且一端通过导管的壁到达其外部。 套筒状的管围绕轴并且紧密地紧固在其底端处于轴并且在其顶端紧固到导管壁以提供围绕轴的流体密封的密封。 该管具有足够的柔性和柔韧性，以抵抗轴的旋转施加可忽略的约束力。 位于流体流外部并耦合到轴的外部突出部分的感测装置在轴上施加预定的约束。 这种约束限制了轴在高流速下的最大旋转，以最小化施加在密封管上的疲劳应力，但不会妨碍在低流速下的旋转。 感测装置响应于轴的受限制的旋转，并且与感测装置相关联的电子电路将响应转换成指示流体的流速的信号输出。
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公开(公告)号：USH1326H
公开(公告)日：1994-07-05
申请号：US632708
申请日：1990-12-24
申请人： Paul J. Lefebvre
发明人： Paul J. Lefebvre
CPC分类号： G01M10/00
摘要： A system is described for providing means by which the flow in a fluid suchs water in a fluid flow loop can be accurately controlled to undergo user defined transients. Besides, the system allows for velocity variations over a wide range of velocities.
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公开(公告)号：US5078009A
公开(公告)日：1992-01-07
申请号：US632709
申请日：1990-12-24
申请人： Paul J. Lefebvre
发明人： Paul J. Lefebvre
IPC分类号： G01M10/00
CPC分类号： G01M10/00
摘要： A system is described for testing a pump or a turbine impeller under transient operating conditions in a fluid flow. The system provides simultaneously, as a function of time, user defined impeller speeds, fluid flow rate and rise in fluid pressure so as to simulate real conditions. This information can be used to analyze the performance of existing impellers or for designating new impellers.
摘要翻译： 描述了一种用于在流体流动下的瞬态操作条件下测试泵或涡轮叶轮的系统。 该系统同时提供用户定义的叶轮速度，流体流速和流体压力的上升作为时间的函数，以模拟实际条件。 该信息可用于分析现有叶轮的性能或指定新的叶轮。
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公开(公告)号：US5513526A
公开(公告)日：1996-05-07
申请号：US279037
申请日：1994-07-20
摘要： The present invention relates to measuring device for measuring a componentf a force acting on a test body, such as a hydrofoil, positioned within a testing apparatus. The measuring device has a test body formed by a foil shaped center section and two adjacent end sections. Each end section is joined to the center section by a flexure member having sufficient stiffness so that there is negligible relative motion between the center section and the end sections as a fluid medium flows past the center section. At least one strain gauge is mounted to at least one flexure member to measure the forces acting on the center section. A method for measuring the load on a test body is also described.
摘要翻译： 本发明涉及用于测量作用于位于测试装置内的诸如水翼的测试体的力的分量的测量装置。 测量装置具有由箔形中心部分和两个相邻端部部分形成的测试体。 每个端部通过具有足够刚度的挠曲构件连接到中心部分，使得当流体介质流过中心部分时，在中心部分和端部部分之间存在可忽略的相对运动。 至少一个应变计安装到至少一个挠曲构件以测量作用在中心部分上的力。 还描述了一种用于测量测试体上的负载的方法。
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