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    • 62. 发明申请
    • METHOD AND DEVICE FOR MULTIPLE-FREQUENCY TRACKING OF OSCILLATING SYSTEMS
    • 振荡系统多频跟踪的方法和装置
    • US20170030870A1
    • 2017-02-02
    • US15302824
    • 2015-03-30
    • ETH ZURICH
    • Jurg DUALTobias BRACKRobin VUJANIC
    • G01N29/28G01N29/04
    • G01N29/28G01N9/34G01N11/16G01N29/04G01N2009/006
    • A method to measure the vibrational characteristics of an oscillating system (1) uses a control system (6, 7a, 7b, 7c). The oscillating system comprises a resonator, at least one vibration exciter and at least one sensor. The resonator is excited by the vibration exciter, and the motion of the resonator is measured by the sensor. The control system uses the sensor to control the motion of the resonator by the vibration exciter. The motion of the resonator is a superposition of at least two harmonic motions, and the control system comprises at least two subcontrollers (7a, 7b, 7c). Each harmonic motion is controlled independently by one of the subcontrollers. The harmonic motions are controlled by the subcontrollers simultaneously. A corresponding device is also disclosed.
    • 用于测量振荡系统(1)的振动特性的方法使用控制系统(6,7a,7b,7c)。 振荡系统包括谐振器,至少一个振动激励器和至少一个传感器。 谐振器由振动激励器激励,谐振器的运动由传感器测量。 控制系统使用传感器通过振动激励器控制谐振器的运动。 谐振器的运动是至少两个谐波运动的叠加,并且控制系统包括至少两个子控制器(7a,7b,7c)。 每个谐波运动由一个子控制器独立控制。 谐波运动由子控制器同时控制。 还公开了相应的装置。
    • 69. 发明授权
    • Method for measuring density of Newtonian and non-Newtonian fluids
    • 测定牛顿流体和非牛顿流体密度的方法
    • US4852388A
    • 1989-08-01
    • US214299
    • 1988-07-01
    • Noh-Aeok ParkThomas F. Irvine, Jr.
    • Noh-Aeok ParkThomas F. Irvine, Jr.
    • G01N9/34G01N11/12
    • G01N9/34G01N11/12
    • The present invention relates to a method for determining the density of a liquid using a falling needle viscometer. The viscometer includes a vertical cylinder which is filled with the liquid the density of which is to be determined. Using a funnel at the top of the cylinder, a first needle having a known density is allowed to fall through the liquid in the cylinder. The time that the needle falls between two marks, or transducers, spaced on the cylinder a known distance is measured from which the velocity of the needle through the liquid is calculated. Then a second needle having the same dimensions as the first and a known density different from that of the first needle is allowed to fall through the liquid. The time that the second needle falls between the two marks on the cylinder or transducers is measured and the velocity of the second needle through the liquid is calculated. Using the densities of the two needles and the velocities of the needles through the Newtonian liquid the density of the liquid is calculated using disclosed equations. Using the densities three needles and the velocities of the needles through the non-Newtonian liquid, the density of the liquid is calculated using the disclosed equations.
    • 本发明涉及一种使用落针式粘度计测定液体密度的方法。 粘度计包括垂直圆柱体,其中填充有要确定密度的液体。 使用圆筒顶部的漏斗,允许具有已知密度的第一针通过圆柱体中的液体落下。 测量针在两个标记之间的时间,或在圆筒上间隔已知距离的换能器,计算针穿过液体的速度。 然后允许具有与第一针相同尺寸的第二针和与第一针不同的已知密度通过液体落下。 测量第二针落在气缸或换能器上的两个标记之间的时间,并计算通过液体的第二针的速度。 使用两针的密度和针通过牛顿液体的速度,使用公开的等式计算液体的密度。 使用密度三针和针通过非牛顿液体的速度,使用所公开的等式计算液体的密度。
    • 70. 发明授权
    • Method and apparatus for measuring fluid density
    • 用于测量流体密度的方法和装置
    • US4773253A
    • 1988-09-27
    • US110108
    • 1987-10-15
    • Edward E. Francisco, Jr.
    • Edward E. Francisco, Jr.
    • G01N9/34G01N9/32
    • G01N9/34
    • A freely rotatable turbine is placed in the path of flowing fluid to drive the turbine at an angular velocity that, at steady state, is dependent upon the linear velocity of the flowing fluid. A transient condition is created in the angular velocity of the turbine. The time constant of the transient condition is determined. The time constant is representative of the density of the flowing fluid--the shorter the time constant, the higher the density and vice versa. The transient condition is created by disturbing the free rotation of the turbine, namely, by imnpairing free rotation to reduce the angular velocity of the turbine to zero, and then permitting the turbine to return to free rotation.
    • 可自由旋转的涡轮机被放置在流动流体的路径中以以稳定状态取决于流动流体的线速度的角速度驱动涡轮机。 在涡轮机的角速度中产生瞬态条件。 确定瞬态条件的时间常数。 时间常数代表流动流体的密度 - 时间常数越短,密度越高,反之亦然。 通过干扰涡轮机的自由旋转,即通过对自由旋转进行自由旋转以将涡轮机的角速度降低到零,然后允许涡轮返回到自由旋转而产生瞬态。