7 results about "Normal force" patented technology

The present application belongs to the field of geotechnical engineering in-situ testing technology, and discloses a kind of in-situ shear test device and test method in field drilling, including ground driving system, drill rod, centralizer and shear probe, ground driving system includes shear loading assembly, tangential pressure assembly and normal pressure assembly, tangential pressure assembly is connected with shear loading assembly by hydraulic line, for driving shear loading assembly to output tangential force;Drill rod bottom end is connected with shear probe, normal pressure assembly is connected with shear probe by hydraulic line, drives shear probe to output normal force;Shear probe is equipped with centralizer, and centralizer is used to contact with the inner wall of borehole;Tangential pressure assembly and normal pressure assembly are all servo motor driven hydraulic equipment, and are controlled by industrial computer;The accurate constant pressure control of normal stress is realized by ground driving system, test is more accurate, and is suitable for soft soil to hard rock extensive stratum, and centralizer can prevent eccentric force from affecting test accuracy.

This invention discloses a method, system, and medium for measuring stress and earth pressure behind retaining walls / piles under localized overload. Addressing the shortcomings of existing technologies in simultaneously considering stress or earth pressure measurement under localized overload and rotational displacement of retaining walls / piles, this invention first solves the problem of measuring additional vertical stress behind retaining walls / piles under localized overload. The calculation model is constructed by combining theoretical derivation of the mechanical response of a semi-infinite elastic body surface subjected to a concentrated normal force with experimental test data analysis. Secondly, the invention solves the problem of measuring earth pressure behind retaining walls / piles under localized overload. The optimized scheme provides identification schemes for eight measurement conditions under five types of rotational displacement modes of retaining walls / piles, as well as non-limit active earth pressure measurement schemes under each measurement condition. The measurement method of this invention has a clear calculation model, easily obtainable parameters, and high engineering applicability. This invention also provides a force measurement system based on the measurement method and a medium for carrying the measurement method.

This invention discloses a finite element simulation method and system for a suspension bridge tower top saddle. The method includes: collecting multiple types of parameters; iteratively solving for tangential and normal forces based on an initial tangential stiffness matrix; calculating the actual contact friction coefficient based on the coupling relationship between temperature and contact normal pressure; calculating a tangential correction coefficient based on the actual contact friction coefficient, the ratio of tangential to normal forces, and the linkage relationship between the saddle geometric parameters; dynamically adjusting the tangential stiffness matrix based on the correction coefficient, the saddle pre-offset, and the synergistic relationship between cable stress; constructing a finite element model and simulating it; and iteratively optimizing until convergence. The system corresponds to the modules described above. This invention optimizes simulation accuracy through multi-factor coupling and linkage, adapting to complex working conditions and providing reliable support for the design and construction of suspension bridges.

The application discloses a bolted joint normal contact stiffness driven assembly preload and fractal parameter optimization method, and belongs to the field of dynamic characteristic analysis of numerical control machine tools. The method comprises the following steps: a mapping relationship model of the normal contact stiffness of the bolted joint, the normal force, the fractal dimension of the joint surface and the surface roughness parameter is established; the normal contact stiffness under the steady state is taken as the target, and the inflection point is defined as the optimization result of the normal force, the fractal dimension of the joint surface and the surface roughness parameter; a normal force and assembly preload relationship model is established, and an assembly preload optimization method considering the safety factor is proposed; a cutting parameter and joint surface fractal dimension and surface roughness parameter relationship model based on a neural network is constructed, and the cutting parameter is optimized reversely. The application not only optimizes the assembly preload and the surface characteristic parameter from the assembly dimension, but also controls the surface characteristic parameter from the manufacturing angle, and has important engineering value for improving the normal contact stiffness of the bolted joint and the dynamic characteristics of the whole machine.

The invention relates to a method of determining a mechanical action torque component at a guide point of a cutting blade (L) for a cutting machine, the cutting blade being guided into a presser foot (P) of a cutting head of the cutting machine. The method comprises positioning a five-component force transducer on the presser foot, wherein the five-component force transducer comprises a plurality of sensors capable of determining a normal force, a lateral force, a roll torque, a pitch torque, and a yaw torque of the cutting blade; establishing a calibration matrix of the force transducer; determining forces experienced by the cutting blade in three dimensions based on measurements obtained from the sensors and the calibration matrix.

A bearing assembly comprising a first part, a second part and a constraint device. The first part comprises a first bearing member defining a first bearing surface. The second part comprises a second bearing member. The second part is configured to rotate relative to the first part about an axis of rotation, such that the second bearing member rolls along the first bearing surface and exerts a normal force which can be represented by a point force acting on the first bearing surface at a contact point. The constraint device is configured to constrain a relationship between a position of the contact point along the first bearing surface in at least one direction radial to the axis of rotation and an orientation of the second part about the axis of rotation over at least a portion of a range of rotation of the second part.

This application relates to the field of tunnel boring equipment technology, and discloses a method and system for predicting the normal force of a cutter roller that takes into account rotational asymmetry. The method includes: obtaining parameters such as rock mass strength, penetration depth, and cutter geometry; calculating and superimposing the areas of the inner and inner compression zones of the cutter roller, and spreading them out to the circumference of the rotation trajectory to determine the cutting groove width; calculating the contact arc using the penetration depth and cutter radius, and deriving the total contact area in conjunction with the cutting groove width; calculating the contact pressure and integrating it along the total contact area to obtain the single cutter rock-breaking resultant force; setting the point of application of the resultant force to pass through the cutter axis and bisect the contact angle corresponding to the contact arc, and decomposing the resultant force to obtain the single cutter rock-breaking normal force. This invention transforms the spatial rock-breaking destruction zone into a planar equivalent integration domain, eliminating the theoretical errors caused by the traditional straight-line cutting assumption and improving the accuracy of the cutter normal force calculation.