Boots – shoes – and leggings
Patent
1995-01-13
1998-06-23
Cosimano, Edward R.
Boots, shoes, and leggings
73865, 364550, G01G 900, G06F 1900
Patent
active
057711771
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for a dynamic load measurement suitable for time-varying forces under dynamic states excited by shaking, oscillating and/or vibrating conditions, such as measuring a load when that load is varying during measuring by fluid flowing, and measuring a load for moving objects such as live fish, and for a time-varying place or base such as sailing vessels, flying airplanes, conveyers and so on, and for running vehicles and so on.
BACKGROUND OF THE INVENTION
Up to now, many ideas have been proposed about a load measurement of a time-varying force under dynamic states excited by shaking, oscillating and/or vibrating conditions. However, conventional load measurement methods and equipment measure a static force or a quasi-dynamic force at measuring state conditions, with a long range period on the order of 1 second, and with a small acceleration which must be less than one G. Such conventional dynamic load measurements are within a range of a static load measurement.
The present inventors proposed a dynamic load sensing method, a dynamic load analyzing sensor and a dynamic load measurement equipment beyond a range of a static load and/or a quasi-dynamic load measurement in PCT/JP91/01168 (WO93/05374) and PCT/JP92/01094 (WO93/05371).
SUMMARY OF THE INVENTION
The present invention is a method and an apparatus for measuring a dynamic load which is not affected by shaking, oscillating and/or vibrating conditions excited by the apparatus itself and the external environment, using by much more improved on the above dynamic load sensing method, the above dynamic load analyzing sensor, and the above dynamic load measurement equipment.
The method for measuring a dynamic load concerned in the present invention involves the use of an arrangement in which one end part of a component structure including a spring mass system or fixed to the based composed of a non-spring mass system. The other end part of the component structure is free, working a load at the free end part of said component structure composed by the spring mass system. In the method, the base is made to periodically and continuously move, vibrate and/or undergo resultant motion together with said component structure composed by the spring mass system. Here and elsewhere herein it will be understood that `moving` or `vibrating` is defined as a time-varying motion including moving and vibrating motions and their resultant motions), measuring continuously a displacement y.sub.1 of said base and a displacement y.sub.2 of said free end part of said component structure, obtaining the first-order derivatives y.sub.1 and y.sub.2 and the second-order derivatives y.sub.1 and y.sub.2 with respect to time from said displacements y.sub.1 and y.sub.2, and calculating a mass m of said load using the following equation: +y.sub.2)+f.sub.1 (my.sub.1,my.sub.2)! measurement matrix, g being the gravitational acceleration, kf.sub.2 (y-y.sub.1 +y.sub.2) being the material term of the component structure of the spring mass system; k being a spring constant, f.sub.3 (y-y.sub.1 +y.sub.2) being the damping term such as viscous friction, coulomb, hysteresis, fluid drag or fluid virtual mass drag damping; and f.sub.1 (my.sub.1, my.sub.2) being the resultant time-varying forces term acting on the object having mass m).
The apparatus for measuring a dynamic load of the present invention comprises a base that includes a non-spring mass system; a frame body which includes a spring mass system having one end part fixed to base, and having an other end part that is free; a first displacement sensor for measuring a displacement y.sub.1 of the base as excited by vibrations and oscillations at a fixed end part of the frame body; a second displacement sensor for measuring a displacement y.sub.2 of the free end part of the frame body; an analyzing unit by which a mass of a load acting on the free end part is calculated using the displacements y.sub.1 and y.sub.2 ; and a vibrating means which makes the base periodi
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patent: 4240289 (1980-12-01), Saner
patent: 4881172 (1989-11-01), Miller
patent: 5442960 (1995-08-01), Solberg, Jr.
patent: 5526697 (1996-06-01), Tada et al.
Tada Eiichi
Watanabe Kazuo
Cosimano Edward R.
Kyoei Automatic Control Technology Co., Ltd.
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