63 results about "Force equilibrium" patented technology

A counter-balance apparatus and method, including configurable weights, suspensions, and supports, upon which an external force can be exerted, and as a result, will react as a counter-balance to said external force as a means to provide force resistance and stability; wherein the construct may be encapsulated, varied in materials, size, and substance, enabling said counter-balance with a predictable and known effect to be produced at scale, readily installed, moved, or manipulated, to address a plethora of stabilization applications, and which further comprises fastener(s) and/or band(s) to secure it to immobile, mobile, or in-motion objects, and computational and communications capabilities to dynamically adjust to external factors.

Embodiments of the invention provide knee prostheses which more faithfully and closely replicate the function, anatomy and physiology of the normal human knee yielding a number of advantages. Among other things, such prostheses can provide an increased range of motion and function more normally particularly in extension, deep flexion and during normal gait. Knee prostheses according to various aspects of the invention recognize that during movement of the knee, particularly during flexion, the kinematics of the bones of the knee are a result of achieving equilibrium of the forces that cause motion of the knee. In addition, the shape of the articular surfaces acting in combination with forces imposed by various muscles, ligaments and tendons, determines the direction of the large contact forces.

The invention proposes a hoisting-cable drive for a mobile crane, which hoisting-cable drive uses a single bottom-hook block (15) instead of a known double bottom-hook block. However, to prevent this single bottom-hook block (15) from tilting in the two cable lines (9, 10), for example due to possible variations in the elongation of the two cable drives, the hoisting-cable drive according to the invention comprises a kinematic force equilibrium device (17, 21), which can equalize such differences. To this effect, another embodiment of the hoisting-cable drive according to the invention uses a hoisting-cable load pickup (21) within each cable line arrangement so that the rotary speed of the winches (7, 8) can be varied, taking into account any load differences in the individual hoisting-cable lines (9, 10). Furthermore, the invention also proposes that the rotary speed of the winches (7, 8) be adjusted, taking into account the geometric winch states and crane states.

A lens moving device is provided. The lens moving device includes: a bobbin; a first driving unit coupled to the bobbin; a second driving unit configured to move the first driving unit through an electromagnetic interaction with the first driving unit; a sensing magnet disposed on one side of the bobbin; a location detection sensor configured to sense a location of the sensing magnet; and a correction magnet disposed on an opposite side of the bobbin.

According to the present disclosure, static tilt and dynamic tilt of the bobbin, to which a lens module is to be coupled, may be enhanced by a sensing magnet and a correction magnet which establish magnetic force equilibrium with each other.

The invention discloses a prediction method for discrete pre-tightening force of a rotation angle method, and the prediction method is mainly used for design and assembling processes of main bolts of engines. The method is divided into two conditions of: in an elastic range, carrying out force balance on a bolt connection pair by utilizing a generalized Hooke's law: a combined computation of <Sigma> F=0 and deformation compatibility <Theta>=(<Delta>Lpull+<Delta>Lpush)*360/P, so as to obtain pre-tightening force distribution of the rotation angle method; and if plastic deformation occurs to the bolt connection pair, adopting a law of conservation of energy: obtaining a false stress greater than real stress and a false strain less than the real strain under elastic assumption, obtaining a real stress and a real strain by adopting the law of conservation of energy, and finally obtaining the pre-tightening force distribution of the rotation angle method through nonlinear iterative computations of force balance and deformation compatibility. The method disclosed by the invention has the advantages of being simple in computation and well-organized.

The invention relates to a dynamic compactor capable of realizing the amplitude-variable followup of an A-bracket with an arm support, which is characterized in that a followup A-bracket is mounted on a dynamic compactor rotating platform, an amplitude-variable draw rod is arranged between an inner diagonal rod and an arm support, a swing arm mechanism is arranged at the lower parts of the amplitude-variable draw rod and the inner diagonal rod, the swing arm mechanism is composed of a swing arm rack and a telescopic oil cylinder, and the followup A-bracket forms linkage with the amplitude-variable draw rod by the swing arm mechanism. Wire ropes of a hoisting mechanism are connected with a dynamic compactor weight through a pulley at the top end of the followup A-bracket and a pulley at the top end of the arm support, so that the quantity of front wire ropes at the top end of the arm support is the same with that of back wire ropes at the top end of the arm support. When the amplitude-variable draw rod drives the arm support to realize an amplitude-variable process, the swing arm mechanism connected with the followup A-bracket synchronously drives the followup A-bracket to swing. The amplitude-variable followup of the followup A-bracket with the arm support is realized, so that the stress on the arm support of the dynamic compactor is more reasonable, the stress balancing of the arm support can be realized to the greatest extent, the structural stress of the arm support can be improved, the self-weight of the arm support can be reduced, and the dynamic compaction operating performance of the arm support and the complete machine can be improved.

A method and apparatus for fastening two parts together. An initial interference fit may be created between a fastener and at least a portion of a hole extending through the two parts while maintaining a force equilibrium. A final interference fit may be created between the fastener and the hole, while maintaining a new force equilibrium.

The invention discloses a bacillus subtilis strain for producing high-purity chiral meso-2,3-butanediol as well as a construction method and application of the strain. The construction method comprises the steps of knocking out an acoA gene of a direct substrate of 2,3-butanediol, acetoin in a degradation pathway, from bacillus subtilis, knocking out an acetoin reductase coding gene bdhA, knocking out a pta gene in a byproduct acetic acid formation path and knocking out a 1dh gene in a byproduct lactic acid formation path, over-expressing a synthesis branch a1sSD promoter through a P43 strong promoter, over-expressing meso-2,3-butanediol dehydrogenase coding gene budC through a P43 strong promoter, and over-expressing a transhydrogenase coding gene udhA in a reducing force equilibrium process through a P43 strong promoter. The constructed bacillus subtilis engineering strain is safe and harmless, and can produce meso-2,3-butanediol with chiral purity greater than 99% by taking glucose as a substrate.

The invention discloses a dynamic load information calculation method for an exoskeleton robot. The dynamic load information calculation method comprises the steps that 1, a six-dimensional force/moment sensor is arranged between an elbow joint and an end effector, and the force and moment information of the load is measured; angle sensors are arranged at the joints of the upper limb exoskeleton;2, the force and torque data of the load and the angle data of each joint are collected; 3, the driving torque of each joint is calculated according to the angle data of each joint and the inertia tensor matrix, and then the driving torque and the force and moment date of the load are utilized to construct a force and moment balance equation of the position at which the six-dimensional force/moment sensor is located through a d'alembert's principle; 4, the equilibrium equation of two force with the largest change and the equilibrium equation of two moments with the largest change under no-loadcondition are selected; and 5, the four equations obtained in step 4 are solved, and the load weight m and the position information x<m>, y<m> and z<m> of the load center of gravity relative to the six-dimensional force/moment sensor are obtained. The dynamic load information calculation method can quickly and effectively calculate the dynamic load information of the exoskeleton robot.

The invention discloses a rotary blade-box rub-impact force determining method and belongs to the technical field of machinery dynamics. The method includes the following steps of establishing a function equation Ue+Uc=W between a blade and a box at a certain moment according to the conservation law of mechanical energy; establishing the force equilibrium relation between the blade and the box and obtaining the expression of the radial force Fn in the position of a blade tip; decomposing the blade tip radial force Fn according to the normal direction and the tangential direction of the blade tip according to the bending deformation of the blade, wherein -FL=-Fncos[v'(L,t)], and -FT=Fnsin[v'(L,t)]; and finally, composing the stress on the blade tip.

The invention relates to the technical field of actuating mechanisms, and provides an electric actuating mechanism for dynamic force equilibrium positioning. The electric actuating mechanism can realize dynamic force equilibrium output. The electric actuating mechanism for dynamic force equilibrium positioning comprises a power supply, a motor, an output shaft and a speed reducer, wherein a handwheel sensor and a position sensor are arranged on the speed reducer; and a torque sensor is arranged on the output shaft. The electric actuating mechanism also comprises a digital signal processor (DSP) processing system and a variable frequency drive module, wherein a signal input end of the DSP processing system is electrically connected with signal output ends of the handwheel sensor, the position sensor and the torque sensor to acquire the output torque and the speed of the electric actuating mechanism and feed the output torque and the speed back to the variable frequency drive module so as to adjust the running of the motor in real time.

The present invention relates to the technical field of engineering machinery, and discloses a screw pump, which comprises a rotor and a stator, wherein the stator is wrapped on the outer side of the rotor, the stator and the rotor form a screw pair, the inner wall of the stator and the outer wall of the rotor are connected in a sealed manner, a plurality of sealed cavities are formed between the inner side of the stator and the outer side of the rotor, the screw pump further comprises a pre-tightening force adjustment device, the pre-tightening force adjustment device comprises a plurality of clamping mechanisms wrapped on the outer side of the stator and aligned along the axial center line direction of the stator, and each clamping mechanism can be separately adjusted, ie., the action forces of each clamping mechanism on the stator can be controlled separately. With the technical scheme of the present invention, the action forces of each clamping mechanism on the stator can be adjusted so as to improve the pre-tightening force equilibrium between the stator and the rotor in the screw pair of the screw pump, such that the wear is generated between the stator and the rotor so as to prolong the service lives of the rotor and the stator.

The invention discloses a different-step-size efficient dynamic analysis method for a train-rail-structure coupling system. The method comprises a train structure model module, a rail structure model module, a lower structure model module, a wheeltrack dynamic contact model module between wheels and a rail steel rail, a rail unsmooth module and a dynamic mutual action model module between the rail and a lower structure, wherein the train structure model and the rail structure model are coupled into a train-rail subsystem through a wheeltrack contact relationship, and the lower structure is a lower structure subsystem; the train-rail subsystem and the lower structure subsystem are coupled through a mutual action force equilibrium condition between the rail and the lower structure; and the train-rail subsystem and the lower structure subsystem adopt different time integral step sizes, the train-rail subsystem adopts a sub step size of the small time integral step size, and the integral step size of the lower structure subsystem adopts a main step size of the large time integral step size, wherein the main step size is the integer multiple or non-integer multiple of the sub step size.

The invention discloses a simple tire pressure monitoring alarm device. The simple tire pressure monitoring alarm device in the invention comprises a mechanical pressure switch, a cell and a buzzer; the mechanical pressure switch comprises a pressure sensing element and a microswitch which is cascaded in a connection loop of the cell and the buzzer. Preferably, the mechanical pressure switch is a force equilibrium type mechanical pressure switch. The invention also discloses a small electric car which comprises tires, and the tire is provided with the simple tire pressure monitoring alarm device provided in the invention; the pressure sensing element of the mechanical pressure switch is installed in the tire, the buzzer is fixed at the exterior of the tire. The simple tire pressure monitoring alarm device provided in the invention has the advantages of simple construction and low cost, and is especially applicable to transportation vehicles such as small electric cars and motorcycles.

The invention relates to a hydrostatic valve arrangement for flushing a pressure medium from a working line of a hydraulic circuit includes a flushing valve with a first flushing connection for connecting to a first working line and an output connection for connecting to a pressure medium sink. The arrangement also includes a pressure valve arranged in a pressure medium flow path of the arrangement from the output connection in the direction of the pressure medium sink. The pressure valve has a valve body on which a force equilibrium is formed. The force equilibrium includes a pressure equivalent that acts on the valve body in a direction that blocks the pressure medium flow path and an opening pressure that acts in a direction that opens the pressure medium flow path and is dependent on the pressure at the output connection. The arrangement further includes an adjusting device for shifting the force equilibrium.