Gravity center measurement instrument based on moment balance principle

Abstract

Disclosed is a gravity center measurement instrument based on the moment balance principle. The instrument is composed of a supporting plate, six pressure sensors distributed on the periphery of the supporting plate, a mechanical transmission structure, a zooming circuit and a single-chip microcomputer. An intersection point of the gravity vertical of an object to be measured and the supporting plate and the face of the supporting plate is worked out based on the moment balance principle; component force of the G[total] of the supporting plate and the object at each coordinate of a space rectangular coordinate system established on the plate is worked out, and therefore direction vectors of the G[total] are acquired; equations about gravity action lines of the object are worked out based on the space geometry principle; when more equations about the gravity action lines are acquired after the object and the supporting plate rotate to a certain position, the G[total] (x[total], y[total] and z[total]) of the object and the supporting plate is worked out based on the fact that the gravity center passes through all the gravity action lines, and the gravity center G[object] (x[object], y[object] and z[object]) of the object to be measured can be worked out with combination of M[object] and M[plate] based on the fact that G[object], G[plate] and G[total] are located in the same line. In this way, the production of an automatic and computerized instrument which is simple in structure and convenient to operate is achieved on the premise that measurement accuracy in solving the gravity center of the object is guaranteed.

Description

technical field [0001] A center-of-gravity measuring instrument based on the principle of space moment balance, mainly used for various industrial production components (such as flywheels, shafts, machine tools), products (such as engines), product models (aircraft, ships, car models) Or the measurement of the center of gravity of entities such as common items that require the measurement of the center of gravity belongs to the field of center of gravity measurement. technical background [0002] The center of gravity is the point at which the algebraic sum of the product of the gravitational force on each particle on the object and the product of the horizontal distance between the particle and this point is zero. Therefore, to require the coordinates of the center of gravity of an entity, the internal and external shape of the entire object and the density of each particle must be obtained. data. The position of the center of gravity of a product or structure has an impor...

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Problems solved by technology

Wireless sensor network technology, industrial CT scanning method and nuclear magnetic resonance method: use wireless sensor technology, CT scanning and nuclear magnetic resonance to effectively measure the internal and external shapes of three-dimensional entities, and then use the center of gravity property coordinate equation to solve the problem, but this method is technically difficult Large, high technical cost, and can not measure the center of gravity of the three-dimensional entity with internal cavity and uneven density; the suspension method is to hang the three-dimensional entity with a flexible rope, and the center of gravity of the object will be located on the space line where the rope is located. Convert the spatial position and measure the space line where the other center of gravity is located again, then the center of gravity is recorded above the intersection point of the two space lines. This method needs to effectively collect and solve the data of the space line equation where the center of gravity is located, but due to the non-rigid constraints of the three-dimensional entity in the flexible rope The degree of freedom is large and unstable, so there is no effective method for data collection at present, so this method cannot realize the automation of the center of gravity determination, and the application prospect is poor; the weighing method uses the principle of spatial torque balance to solve The coordinates of the center of gravity of a three-dimensional entity, this method is widely used, but at present, the method of measuring the center of gravity of an object at home and abroad needs to comprehensively use the measurement data of the force sensor and the angle sensor, and then solve the spatial coordinates of the three-dimensional entity; the angle sensor The application makes the measurement device complicated, and the measurement procedure is not simple enough; the buoyancy method uses a precision motion platform to control the step length of the object to be immersed in the liquid, so as to realize the virtual layering of the measured object; the variable arm length measurement method is proposed, through the measurement Obtain the cross-sectional area and barycenter coordinate information of the virtual fault by changing the buoyancy: this method has a complicated measurement process and has the disadvantage that it is only applicable to three-dimensional entities with uniform density.

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