93 results about "Mechanical equilibrium" patented technology

The invention discloses a load simulation method for a cataplane landing gear, and belongs to the field of strength design of the cataplane landing gear. The load simulation method mainly comprises the following steps: analyzing stress on the whole cataplane, a nose gear and a main landing gear of a cataplane, so as to establish a corresponding mechanic equilibrium equation; establishing a nose gear simulation analysis model, a main landing gear simulation analysis model and a whole cataplane dynamic simulation analysis model according to the nose gear mechanic equilibrium equation; finally, correcting the whole cataplane dynamic simulation analysis model according to testing gravity center data and a front main landing gear load curve during practical catapult launching of the cataplane. The corrected model is the model capable of being used for catapult launching load simulation of the cataplane, problems in load design and analysis of the landing gear during catapult launching of the cataplane are solved, and the flight test verification of a carrier-based aircraft in an aircraft carrier platform and a land-based training ground is guaranteed.

The invention belongs to the technical field of micro thrust measurement, and especially relates to a micro thrust measuring method. The invention further provides a pendulum micro thrust measuring device and a three-wire torsion pendulum micro thrust measuring device. Under the condition that the gravity direction and the micro thrust direction are perpendicular to each other, a micro thrust physical variable is converted into a displacement physical variable based on the principle of mechanical equilibrium. The problem in the prior art that measurement is of low precision and large error due to the fact that the thrust and the gravity are in the same direction, the sensitivity to the mass change of a thruster or other factors is solved. The method and the devices have the beneficial technical effects of no influence of gravity, small friction, and good damping effect.

The invention discloses a three-dimensional static modeling method of a rope-driven continuous mechanical arm. The method comprises the following steps: (S1) three-dimensional force balance equationsof each equivalent torsion spring are built according to a three-joint false rigid body model to obtain deflection angles of each torsion spring when the rope-driven continuous mechanical arm is suffered from preset rope tension, external force and gravity; (S2) resultant force and resultant torque expressions of the rope tension, external force and gravity to each branch section terminal are built according to the deflection angles of each torsion spring; and (S3) the resultant force and resultant torque expressions of the rope tension, external force and gravity to each branch section terminal are substituted into the three-dimensional force balance equations of each torsion spring to obtain three-dimensional static balance equations of the rope-driven continuous mechanical arm. A two-dimensional plane false rigid body equivalent method is developed into three-dimensional space; and the operation efficiency is greatly improved.

The invention discloses a method for concrete pipe segment tunnel lining structure capable of adapting to surrounding rock deformation. The method comprises the following step of converting a sealed pipe segment lining structure into a combined opened structure of the pipe segment lining and an anchor rod, namely, the stress of an anchor rod is gradually increased along with the increase of the surrounding rock deformation so that the surrounding rock deformation is restrained, the mechanical equilibrium of the combined structure and a surrounding rock is realized, extrusion stress of a stratum is further released, the pipe segment lining structure greatly adopt to the stratum extrusion deformation, and the pipe segment lining structure is effectively protected.

The invention discloses a method for establishing a static model of an extra-large double-row four-point contact ball bearing, and the method comprises the following steps of: under a precondition of setting a structure parameter, a material parameter and a load parameter, establishing a geometric model; taking an influence of an bearing running clearance into consideration of the geometric model; depending on a phenomenon that an inner ring is under a balance state under an action of an external load and loads of all rolling bodies, determining a mechanics equilibrium equation of the inner ring; introducing the structure parameter, the material parameter and a load situation of the known bearing into the mechanics equilibrium equation, and calculating displacements sigma a, sigma r and theta of a bearing inner ring, thereby obtaining total elastic contact deformation of a steel ball and a raceway as well as a normal contact load of a contact pair i on a position angle, to obtain contact load distribution of the bearing on various position angles; changing a bearing running clearance value, and drawing a contact load distribution chart of the bearing in various running clearances. Through a scheme design, the double-row four-point contact ball bearing is more precise; moreover, design accuracy of a service life of the bearing is greatly improved.

The invention relates to a synchronizing system of a hydraulic floating type ship lift and a discrimination method for lateral overturning stability of the synchronizing system. The synchronizing system of the hydraulic floating type ship lift is such structured that a boat bearing compartment is arranged in a boat compartment, a boat is floating on the water surface of the boat bearing compartment, two sides of the boat bearing compartment are connected with a plurality of steel wire ropes, each steel wire rope winds around and passes through a reel and is then connected with a floating drum in a shaft well, and reels located at a same side of the boat bearing compartment are connected through a synchronizing shaft. The stability discrimination method comprises the following steps: constructing a hydraulic ship lift system; acquiring data; establishing a mechanical equilibrium equation of the hydraulic ship lift system; and establishing conditions for discrimination of lateral overturning stability of the hydraulic floating type ship lift. The invention theoretically provides a quantifiable method for discrimination of the stability of the hydraulic ship lift; and the method is used for quantitative discrimination of the stability of the hydraulic ship lift, provides bases for reasonable setting of parameters of the synchronizing system of the ship lift and enables reliability and feasibility of the hydraulic ship lift to be improved.

The invention discloses a stabilization platform movement ring eccentric torque measuring method. According to the method, at one side of a movement ring rotation shaft, a forcemeter is adopted to apply a pull force along a vertical upward direction and slowly increase the pull force, and the reading of the forcemeter is recorded when the movement ring rotation shaft rotates; at the other side of the movement ring rotation shaft, the forcemeter is adopted to apply a pull force along a vertical upward direction and slowly increase the pull force, and the reading of the forcemeter is recorded when the movement ring rotation shaft rotates; and mechanical equilibrium equations of the two times of rotation of the ring rotation shaft are listed according to torque balance principles, and the mechanical equilibrium equation set is solved, so that eccentric torque can be obtained. According to the method of the invention, the torque balance principles are adopted, and a strain gauge and a processing circuit are not required. The method has the advantages of convenient operation and simple calculation process.

The invention provides a load applying method under the condition of large deformation of a long-strut landing gear. The load applying method under the condition of large deformation of the long-strutlanding gear comprises the following steps: step 1, calculating vertical and course theoretical displacements delta x and delta y of each loading stage; step 2, presetting vertical and heading mounting positions of the loading device; step 3, establishing an undercarriage load application mechanical simplification model, and calculating an included angle between an ith loading stage load application direction and a theoretical load direction; step 4, establishing a course mechanical balance equation and a vertical mechanical balance equation; step 5, calculating to obtain an ith-stage test vertical load and a course load; step 6, calculating the test applied loads of all the loading stages; and step 7, carrying out a test pre-test according to the calculated load, and obtaining a corrected final load and a preset position result. According to the load applying method under the condition of large deformation of the long-strut landing gear, accurate processing of the landing gear test load can be conveniently achieved, and universality is high.

The invention discloses a method for calculating destabilization of rockfill of a small-watershed ditch and belongs to the technical field of geological hazard control engineering. The method is characterized by comprising the following steps: a. carrying out force analysis on unit-width rockfill of the small-watershed ditch; b. calculating flow velocity VC of debris flow, inferring a distinguishing calculation expression for the rockfill of the small-watershed ditch according to theory of mechanics; c. destabilizing the rockfill according to a mechanical equilibrium condition when a motive force stressed by the rockfill is greater than a resisting force stressed by the rockfill, so as to obtain a distinguishing calculation expression for destabilization of the rockfill in the ditch. According to the method, a destabilization value of the rockfill of the small-watershed ditch can be reasonably determined on the basis of strict theoretical derivation, and thus, a basis is provided for controlling and warning debris-flow disasters of small watersheds; the calculated result is high in accuracy, so that the method meets actual engineering demands.

The invention discloses a satellite-borne planar SAR antenna extensible support structure rod precise adjusting and installing method. The method comprises the following steps that geometrical parameters and locking hinge stiffness parameters of the extensible support structure are determined; a deformation compatibility equation of an extensible support structure is built, wherein the deformationcompatibility equation comprises a rod length compatibility equation, a rod piece intersection mechanical equilibrium equation and an internal and external antenna panel moment balance equation; SARantenna total deformation energy serves as a target object function, the three equations in step S2 serve as constraint conditions, and an extensible support structure rod optimized adjusting and installing basic mathematical model is built; the rod length adjustment amount is calculated through the basic mathematical model in step S3, and precise installation and adjusting are completed. According to the method, by means of a satellite-borne planar SAR antenna extensible support structure rod precise, quantitative, digital and optimized adjusting and installing technology which takes the minimum structural strain energy as the object function and takes the deformation compatibility equation and assembly precision as the constraint conditions, rod pieces are installed and adjusted quantitatively and digitally in the ground assembly process.

The seven-layer coextruded antiswarp composite film with nonsymmetric crystalline characteristics possesses the following structure expression formula: A/B/C/A/B/C, where A is crystalline resin layer, B is adhesive resin layer and C is amorphous resin layer. According to the principle of mechanical equilibrium said invention utilizes the identical charateristics of same kind or same type of materials of design the above-mentioned second layer, third layer and fourth layer into balance bridge structure, and uses said balance bridge structure to counteract the stress imbalance resulted from different crystalline temp. between other layers so as to effectively overcome warp.

The invention discloses an analysis and calculation method for the internal resistance and the power consumption of a crawler travelling mechanism, wherein the specific analysis contents are as follows: (1) theoretical analysis for external characteristics, comprising analysis for a grounding specific pressure, analysis for a subsidence depth, analysis for a ground traction force, and analysis for a running resistance; (2) theoretical deduction analysis for internal frictional resistances, comprising analysis for the frictional resistance generated by the relative rotation of a crawler pin and a pin sleeve, analysis for a frictional resistance between a crawler frame and a crawler, analysis for a frictional resistance at a drive wheel bearing, analysis for a frictional resistance at a guide wheel bearing, and analysis for the engaged frictional resistance of drive wheel teeth and a crawler plate; and (3) determination for a drive torque and a power, comprising determination for a mechanical equilibrium theory and the drive torque, and determination for a power equilibrium theory and the drive power. According to the invention, the internal resistance and the power consumption of the crawler travelling mechanism are systematically analysed and calculated based on strong theoretical research, thus providing a good reference for design for the crawler travelling mechanism; and the calculation pre-processing and post-processing of the method disclosed by the invention are convenient and fast.

The invention relates to an analysis and calculation method of internal resistance and power consumption of a crawler attachment. The specific analysis content comprises: (1) external characteristic theory analysis comprising the analysis of unit pressure of ground, sinking depth, ground traction and driving resistance; (2) internal frictional resistance theoretical derivation analysis comprising the analysis of frictional resistance generated by the relative rotation of a track pin and a pin bush, frictional resistance between a truck frame and a caterpillar band, frictional resistance at the position of a driving wheel bearing, frictional resistance at the position of a guide pulley wheel bearing and meshing frictional resistance of a driving bearing and a track shoe; and (3) the determination of driving torque and power comprising the determination of mechanical equilibrium theory and driving torque, and the determination of power balance theory and driving power. On the basis of solid theoretical research, the invention analyzes and calculates the internal resistance and power consumption of the crawler attachment and provides favourable reference for crawler attachment design; and the software of the invention has convenient and quick pretreatment and posttreatment.

The invention discloses an optimization method for ball injection temporary plugging steering fracturing of a shale gas horizontal well, and belongs to the technical field of hydraulic fracturing of oil and gas fields. The method comprises the following steps: (1) analyzing the stress of the temporary plugging ball when the temporary plugging ball moves in a shaft; (2) establishing a migration speed formula of the temporary plugging ball in the wellbore according to a mechanical equilibrium principle; (3) defining a setting factor of the temporary plugging ball as a ratio of drag force to inertia force; and (4) calculating a temporary plugging ball setting factor according to the field construction data, and researching the feasibility of pitching temporary plugging steering construction under the field condition. And when the setting factor of the temporary plugging ball calculated in the step (4) is far greater than 1, the method further comprises the step (5) of calculating the number of the temporary plugging balls, namely optimizing the construction parameters of the temporary plugging balls according to the calculated number of the temporary plugging balls. The step (5). Themethod can be used for optimization design of the ball throwing temporary plugging steering fracturing construction parameters of the shale gas horizontal well, researching factors influencing the plugging effect of the temporary plugging balls, calculating the using number of the temporary plugging balls under different construction conditions, and providing theoretical guidance for on-site construction decisions.

Systems and methods for modeling drillstring trajectories by calculating forces in the drillstring using a traditional torque-drag model and comparing the results with the results of the same forces calculated in the drillstring using a block tri-diagonal matrix, which determines whether the new drillstring trajectory is acceptable and represents mechanical equilibrium of drillstring forces and moments.

Means for detecting a break in mechanical equilibrium comprise measurement means that deliver a signal corresponding to the measurement of the torque applied to the fastener element, electronic processing means for electronically processing the signal, and computation processing means for computationally processing data output from the electronic processing of said signal. Application to a hand dynamometer tool.

A method considering influence of multiple factors for predicting fatigue life of a large span power transmission wire is disclosed; first, considering the influence of wind speed, ambient temperatureand current carrying capacity on the temperature of the wire, and calculating the actual temperature of the wire; then establishing a mechanical equilibrium equation of the power transmission wire, considering the influence of the temperature on the stress of the wire, and calculating the stress of a steel core aluminum strand of the wire under tension and temperature effects; using an energy method to establish an energy balance equation of the power transmission wire, and calculating the dynamic stress amplitude of the power transmission wire; calculating the equivalent alternating stress of the power transmission wire, and calculating the number of times of vibration resistance of the power transmission wire; calculating the annual vibration cycle number of the power transmission wireunder different frequencies according to the probability distribution of wind speeds and wind directions at each level; and finally, improving a traditional Miner method, considering the influence ofthe interaction between stresses of each level of the wire on the fatigue of the wire, and calculating and evaluating the fatigue life of the wire. The method for calculating the fatigue life of the large span power transmission wire is high in precision and high in speed, and is more in line with the engineering practice of the power transmission wire.

The invention discloses a temporary device for maintaining mechanical equilibrium under a first-arch and second-girder bridge construction process. The temporary device comprises two temporary tie bars and four temporary support bases, wherein each temporary tie bar is arranged between a pair of arch feet of a single arch rib; the four support bases are arranged between the bottom surfaces of onepair of arch feet of the two arch ribs and the top surfaces of two main piers in a one-to-one correspondence mode; each temporary tie bar comprises two tie bar anchor boxes, two groups of anchorage devise and four steel strands; the two tie bar anchor boxes are symmetrically welded on the outer side surfaces of one pair of arch feet in the one-to-one correspondence mode; each tie bar anchor box comprises a top box body, an upper box body, a lower box body and a bottom box body; the two anchorage devices are mounted on the two tie bar anchor boxes in the one-to-one correspondence mode; the foursteel strands are connected between two groups of anchorage devices in the one-to-one correspondence mode; and each temporary support base comprises a pier top section and a beam bottom section. Thetemporary device disclosed by the invention achieves key effect on construction safety and quality guarantee of the whole arch rib and a girder, further can simplify construction processes, and guarantees smooth construction.

Disclosed is an electrical energy copy increment technology. An autorotation unit serves as a generator unit. The autorotation unit is a motor group formed by a group of electric component/electric group and a group of power generating component/generator. The autorotation unit comprises a self-loop operating circuit. According to a balance theory, the output power of the power generating component/generator is necessarily higher than the input power of the electric group/motor, so that the electrical energy required by the autorotation unit for the self-loop operating can be guaranteed, and redundant effective power can still be reserved for outwards transmitting the electrical energy. The technical scheme for solving the problem of effective power includes that the stator core inner diameter of the electric group/motor is necessarily larger than that of the power generating component/generator, and the physical quantity of skill energy of a lever is converted to electrical energy by the numerical value of a radial ratio between the stator core inner diameter of the electric group/motor and the stator core inner diameter of the power generating component/generator, a mechanical equilibrium theory of a weigh beam and the lever and a mechanical skill of the lever.

The invention discloses a force measuring device based on accurate friction coefficient measurement and a support calibration method, and the method comprises the following steps of: applying a horizontal or lateral force to two wedge-shaped load converters on the force measuring device, promoting the height of the force measuring device to change, and recording a horizontal or lateral force value of a sensing device when the height is changed or the change is paused; precisely adjusting the gap between the two load converters to promote tight attachment of the sensing device and the load converters; releasing a power device, and recording a horizontal or lateral force value measured by the sensing device between the two load converters at the moment; according to the mechanical equilibrium relationship of the stress of the load converters, acquiring a relational expression between the friction coefficient and the inclination angle and the horizontal or lateral force of the load converters, and solving the friction coefficient; the friction coefficient can be accurately calculated in a service state of the force measuring device, and the vertical force can be accurately calibrated.