112 results about "Elastic systems" patented technology

The invention discloses a method for utilizing a laser ultrasonic wave to precisely measure a third order elastic constant of metal. The method comprises the following steps: respectively measuring wave velocities of a longitudinal wave, a transverse wave and a surface wave excited by a laser under stress-free state and stress state; utilizing the wave velocities of the longitudinal wave, the transverse wave and the surface wave measured under stress-free state to calculate a second order elastic constant and a density of metal according to a sonic elasticity theory and a Rayleigh equation; utilizing the ultrasonic wave velocities of the longitudinal wave, the transverse wave and the surface wave measured under stress state to introduce an equivalent second order elastic constant and an independently measured linear coefficient of thermal expansion; and lastly, calculating the third order elastic constant according to the sonic elasticity theory. According to the method, a pulse laser source is utilized to excite a sound surface wave, non-contact exciting is performed under a thermal elastic system and an overheated phenomenon of materials is avoided, so as to realize nondestructive measurement. A large amount of sound surface wave data spread for different distances is collected and a correlation function is utilized to calculate a wave velocity of the sound surface wave and a spread distance of sound wave, thereby greatly reducing error of arriving time value of the sound surface wave and promoting the measuring precision of a sound wave velocity.

The invention relates to an absorbent product having a longitudinal direction and a transverse direction and comprising a front and a rear end portion (8, 10), an intermediate crotch portion (12), edges extending in the longitudinal direction and in the transverse direction, an upper, liquid-permeable surface layer (2), a lower, liquid-impermeable surface layer (4), an absorbent body (6) arranged between the surface layers (2, 4) and comprising edges in the longitudinal direction and in the transverse direction, liquid barriers (5) extending in the longitudinal direction arranged essentially parallel to those edges of the product running in the longitudinal direction, the liquid barriers (5) each having a free edge (7), side flaps (3) extending in the longitudinal direction outside the liquid barriers (5) and comprising parts of at least one of the surface layers (2, 4), and elastic elements (11; 14; 30) extending in the longitudinal direction and fastened to the liquid barriers (5) or to the side flaps (3), the liquid-permeable surface layer (2) extending in the longitudinal direction of the product at least between the liquid barriers (5). The liquid barriers (5) are, at least in the crotch portion (12) of the product, in the region between their attachment (9) to the absorbent product and their free edge (7), fixed to the adjacent side flap (3) outside the edges of the absorbent body (6), as a result of which the product has double raised leakage barriers arranged along the edges extending in the longitudinal direction.

A method for preparing the carbon nano-tube / cement self-reinforcing amortization composite material and testing the damping ratio, relates to a method for preparing the cement self-reinforcing amortization composite material and testing the damping ratio. The invention settles the problems of nonuniform dispersion of carbon nano-tube, bad binding capability to the substrate interface, low damping ratio and expensive device for testing the damping ratio, complicated test or big data error in the carbon nano-tube / cement self-reinforcing amortization composite material prepared currently. The preparing method comprises the following steps: adding the cement mixing material, deionized water, superplasticiser, and the latex mixture of cement and polymer in sequence into the carbon nano-tube disperse phase miscible liquid for mixing to uniform and eliminating the bubble, afterwards encasing into the specimen mold for molding by casting; removing the mold and standard maintaining to the prescribed lifetime, then the carbon nano-tube / cement self-reinforcing amortization composite material is obtained. The testing method comprises the following procedures: constructing an elastic system, connecting the acceleration gauge and the strength hammer to the data acquisition system, vertically flipping the test piece with the strength hammer and testing the damping ratio.

A valve includes a housing and a valve seat and a structure fixedly disposed remote from the valve seat, a valve head to open and close the valve seat, fluid being permitted to flow when the valve seat is open and an elastic system anchored on the structure and coupled to the valve head, the elastic system including a biasing element and an elastic element formed of memory metal alloy disposed to contact fluid permitted to flow, the biasing element and the elastic element being configured to cooperatively move the valve head toward a valve seat open position when a fluid temperature is below a lower limit, and the biasing element and the elastic element being further configured to cooperatively move the valve head toward a valve seat closed position in opposition to the biasing element when the fluid temperature is above an upper limit.

The invention relates to the field of kinetic energy power generation of electric automobiles, in particular to a method. According to the method, when a spring upper automobile body with a vertical elastic system vibrates in the running process of an electric automobile, a spur rack vertically fixed in the spring upper automobile body is meshed with a gear which is arranged on another elastic vibrating body and in which a unidirectional bearing is sleeved, the elastic vibrating body is unidirectionally and synchronously driven to be subjected to forced frequency resonance or effective vibration to generate kinetic energy, and a kinetic energy power generation device arranged on the elastic vibrating body generates power by using the generated kinetic energy.

The invention relates to an expansion joint and provides a modular expansion device. The modular expansion device comprises two edge beams, wherein the two edge beams are located on two sides of the expansion joint and are opposite to each other. The modular expansion device is characterized by further comprising at least one middle beam and a support beam; the middle beams are successively arranged between the two edge beams along the same direction of the edge beams; the support beam crosses over the expansion joint and is located under the middle beams; the edge beams and the middle beams are supported and mounted on the support beam; two ends of the support beam are respectively fixed on two sides of the expansion joint via a fixed steel ball support seat and a movable pressure-bearing support seat; each middle beam is connected with the edge beam which directly faces the middle beam or the other middle beam via a waterproof adhesive tape. The invention also provides a bridge comprising the expansion device. According to the expansion device, a displacement control system of the expansion device adopts an elastic system, so that the expansion device has certain adaptability to level angle; meanwhile, one end of the support beam is supported by the movable pressure-bearing support seat while the other end of the support beam is supported by the fixed steel ball support seat, so that the support beam can be adapted to the expansion change of the expansion joint and the multidirectional displacement of the expansion device caused by running of automobile wheels.

The invention discloses a two-level policy decision-based access control method and a two-level policy decision-based access control system, and belongs to the field of access control in information safety. In the method, a local policy decision point (PDP) is deployed at a policy enforcement point (PEP) end, and the local PDP makes a decision for an access request according to a local policy cache, and if the local PDP cannot determine that the decision is a deterministic decision, a central PDP finally finishes the decision according to a system policy library. The system comprises a policydecision server, an attribute publishing point and a plurality of resource servers, wherein a policy enforcement point (PEP) and a local policy decision point (PDP) are deployed on each resource server; and a central policy decision point (PDP) is deployed on the policy decision server. The invention has a good dynamically adjusted elastic system framework, fully utilizes the computing resources of the PEP end, lightens the burden of the central PDP, reduces the network transmission overhead and effectively improves the access control efficiency at extremely low policy update cost.

A torso pushup assistance device for assisting a user in performing pushups is disclosed. The torso pushup assistance device is comprised of a base component, a torso support component rotationally attached to the base component, and an elastic system that connects the base component to the torso support component in one or more optional configurations. In a first embodiment, the elastic system is comprised of a set of one or more pairs of matched elastic bands that removably connect the rear end of the torso support component to the rear end of the base component. The user lies on the torso support component with his or her feet on the floor, and does pushups in the usual way. Depending on the configuration of the matched elastic bands installed on the torso pushup assistance device, the user's effort varies from a small percentage to a large percentage of the force required to do an unassisted pushup.

The invention relates to the field of kinetic energy generation of electric automobiles, in particular to a method for realizing kinetic energy generation of an electric automobile by using vibration. When the electric automobile drives, kinetic energy is generated by using the vibration of a sprung automobile body with a vertical elastic system and enabling a hollow support plate heavy article box which is arranged above the sprung automobile body and is provided with the same vertical elastic system to generate frequency resonance or effective vibration. Furthermore, compared with a kinetic energy recycling mode of the electric automobile during braking, a method of a kinetic energy generating device fixedly arranged on the hollow support plate for generating by using the kinetic energy generated by vibration has the advantage that the utilization efficiency of the kinetic energy is greatly increased.

The invention provides a system and a method of eliciting milk from all mammals that possess teats, including but not limited to dairy animals and humans. A system may be comprised of an elastic system and a vacuum supply. A method may include a milk elicitation system comprised of an elastic system and a vacuum supply. Through the application of vacuum, the elastic system forms, differentiates, seals and adapts to a teat, from the area it ends until up to where the udder ends and it begins, without coming in contact with the teat-end sphincter / lactiferous duct(s). The elastic system interacts proportionately according to the tendencies expressed by teat physiology and dynamics according to the milk pressure change, blood flow, and the effects of applied vacuum, throughout the milk elicitation process, resulting in continuous and complete milk elicitation and supporting the physiological teat return, after the process.

The invention discloses a combined multi-phase vibration-reduction device. The combined multi-phase vibration-reduction device comprises a container, particle systems, viscosity liquid, elastic systems and a screen. The particle systems are formed by spherical particles, bearing rods, fixing rods and built-in transverse cylinders in a two-way arrangement mode, the viscosity liquid is formed by mixing one or more kinds of liquid and located inside the container, and the spherical particles are located inside the viscosity liquid or float or settle at the bottom of the liquid. The viscosity liquid can vibrate inside the container, and the spherical particle systems collide with each other and rub each other inside the screen to consume energy. The viscosity liquid and the particle systems collide with each other and rub each other to consume energy, and the particles and the screen collide with each other and rub each other to consume energy. Advantages of a tuned liquid damper, a viscous damper, a tuned mass damper and a particle damper are combined, energy consumption is performed through the combination of a liquid phase and a solid phase, the vibration-reduction effect is good, and the combined multi-phase vibration-reduction device is widely applied to the fields of constructional engineering earthquake resistance and wind resistance.

The invention discloses a rotational inertia optical measuring method and system. The method includes first calculating a transformation matrix between a visual coordinate system and a body axis system with an identification point on an aircraft model as a medium, then utilizing a trinocular vision system to measure the angle change of the model in the body axis system before and after weight loading, calculating the stiffness of an elastic system according to the torque of the weight relative to the center of rotation, exciting the elastic system to perform free vibration after a loading device is removed, measuring an angular displacement curve of the aircraft model during the vibration process in real time to obtain the vibration circular frequency, and repeating the steps for multipletimes to obtain the rotational inertia of the model by using the least square method. By means of the method, measuring efficiency and accuracy of the rotational inertia of the aircraft model in the control response wind tunnel test can be improved.

The invention relates to the field of electromobile kinetic energy power generation, in particular to an implementation method of frequency resonance applied to the electromobile kinetic energy power generation. When an electromobile is in driving, a vibration sensor arranged on a spring upper electromobile body is used for collecting vibration signals through a main elastic system, an electronic controller is used for adjusting spring rigidity of a sub elastic system hollow supporting plate weight box driven by vibration of the spring upper electromobile body, so that the inherent vibration frequency of the hollow supporting plate weight box is kept to be the same or close to the vibration frequency of the spring upper electromobile body when the electromobile is in driving, the aim of resonance or effective vibration of the sub elastic system hollow supporting plate weight box is realized, and kinetic energy and effective amplitude needed by electromobile kinetic energy power generation are provided.

The variable rigidity elastic system simulator is used in marine engineering field. The present invention includes rigid casing, spring, spring limiting device, spring pre-tensing device, cable and cable guiding hole in the connection relation of connecting the spring inside the rigid casing between the tail of the rigid casing and the cable, penetrating the cable through the cable guiding hole outside the rigid casing to bear the outside tension, and setting the spring limiting device and the spring pre-tensing device onto the spring. The present invention controls the setting of the limiting device and the pre-tensing device to make them begin to exert at the rigid altering point, so as to meet the requirement of simulating variable rigidity elastic system. The system with complicated rigidity variation or high simulation requirement may be also simulated vian increasing the number of the limiters or increasing the number of the rigidity varying points.

The invention provides a frequency-adjustable vibration screen. The frequency-adjustable vibration screen comprises a bearing trough arranged on an elastic system. One side of the bearing trough serves as an open end, and a vibration exciter is arranged on the other side, opposite to the open end, of the bearing trough. The frequency-adjustable vibration screen is characterized in that the vibration exciter comprises a drive motor, the drive motor is connected with a needle rod through a reducer, and the needle rod is connected with a connecting rod through a pin shaft; and the connecting rod is connected with a beating hammer, a sleeve is arranged on the beating hammer, and the sleeve penetrates a fixed guide rod. The frequency-adjustable vibration screen is simple in structure, more convenient to operate and maintain and low in equipment cost.

The invention provides a storage framework of an embedded system. The framework comprises a master control chip which comprises a data memory; a central processing unit connected with the data memory; an ROM (read only memory) program memory connected with the central processing unit, wherein an operating program of the storage framework of the embedded system is stored; and an RAM (random access memory) configurable memory connected with the central processing unit for being configured to another data memory or another program memory according to demand. The framework provided by the invention mixes advantages of the ROM and RAM program memories, and configures code storage plans freely according to demand, and considers the cost and the expandability of function. Meanwhile, the framework provided by the invention has the advantages of low cost, expandable program space and convenience in maintenance and upgrade. Almost applications can be met by an elastic system framework.

A vibration absorbing mechanism for converting complex vibration into triaxial reciprocating vibration comprises an upper panel, an upper frame, a lower frame, a lower panel, an elastic system and a damping system, wherein the elastic system comprises a transverse spring leaf set, a longitudinal spring leaf set, a spring and a vertical spring leaf set; the damping system comprises a vertical damping rod, a transverse damping rod and a longitudinal damping rod; the lower panel, the lower frame, the upper frame and the upper panel are distributed as four-staggered steps from bottom to top; the transverse spring leaf set, the longitudinal spring leaf set, the spring and the vertical spring leaf set which are used as elastic elements are mounted and connected among the steps to form the elastic system of the vibration absorbing mechanism; the vertical damping rod, the transverse damping rod and the longitudinal damping rod which are used as damping elements are mounted and connected among the steps to form the damping system of the vibration absorbing mechanism. According to the mechanism, the complex vibration at the bottom part is decomposed into reciprocating vibration in three directions, and the vibration energy in the three directions can be absorbed and consumed through the damping system, so that the irregular complex vibration can be converted into triaxial reciprocating vibration which can be averaged and reduced through an inertial navigation system mathematical algorithm, and as a result, a good vibration absorbing effect can be achieved.

The invention relates to an elastic system and a method for adjusting the height of a vehicle body, the system comprising eight integral hydro-pneumatic separating hydro-pneumatic springs for mountingon eight support points of a vehicle body, each hydro-pneumatic spring being connected with a driving device for performing a vehicle body lifting and lowering action under the drive of the driving device; The driving device comprises an electric motor oil pump group, two speed regulating valves, two synchronous valves, eight hydraulic one-way valves, eight two-position four-way solenoid valves and one two-position three-way solenoid valve. The four-way solenoid valve and the three-way solenoid valve are connected with a control device, and the control device is connected with a control panel; Explosion-proof valve is installed in the oil inlet and outlet of each oil-gas spring; The oil inlet and outlet of each hydro-pneumatic spring are connected with a hydraulic control check valve through a stop valve; Each hydro-pneumatic spring is provided with an angle sensor; A pressure sensor for detecting the pressure in each cylinder block is mounted on the cylinder block of each hydro-pneumatic spring. The invention can realize the height adjustment of a vehicle body, and has the functions of buffering and absorbing vibration energy of a suspension system.

The invention relates to the field of kinetic energy generation of electric automobiles, in particular to a method for applying a pre-tightening force of a tension spring to kinetic energy generation of an electric automobile. Elastic system vibration bodies in which kinetic energy generation devices are arranged are positioned on the upper surface and the lower surface at static balance positions and are respectively connected with the top and the bottom of an axle support framework of the electric automobile in a mode of the pre-tightening force of the tension spring; the magnitudes of the formed upper and low pre-tightening forces of the tension spring, which are opposite in direction, approach or are equal to tension forces by which a start torque corresponding to critical work of the kinetic energy generation device is a force arm position at the tooth meshed part, so that the vibrating action force is overlapped with one tension force of the tension spring in the same direction, the balance of the pre-tightening forces of the tension spring in two opposite directions can be broken through and the aim of driving the kinetic energy generation devices to generate power is achieved.

The invention discloses a centering device for a drill rod in a hole of an engineering driller. The centering device comprises a central spindle, ribs and an outer shell. The hollow central spindle is located at the center, wherein the two ends of the central spindle are provided with a conical internal thread and a conical external thread respectively. The number of the ribs is two or more, and the ribs are evenly arranged on the outer surface of the central spindle to be firmly connected with the central spindle. A gap is reserved between every two adjacent ribs to form a through groove. The two ends of the outer shell are respectively provided with a rolling bearing, wherein the inner side of the rolling bearing is arranged on the outer surface each rib in a supporting mode, the outer side of the rolling bearing is in close fit with the inner surface of the outer shell, and the ribs and the outer shell rotate relative to each other through the rolling bearing. The centering device can keep the thin and long drill rod running stably, make the axis of a drill bit be close to the center line of the drilled hole as much as possible, effectively prevent the hole from inclining, mitigate violent vibration of a drill rod elastic system in the hole in the radial direction and in the axial direction, and reduce deflecting friction between the drill rod and the drill bit; besides, the drill rod does not make direct contact with the wall of the hole so that damage to the wall of the hole can be reduced effectively, and torque required for drilling is reduced.

The invention provides a detection technology capable of evaluating surface contact under different contact conditions, and specifically relates to a detection method and a detection device for obtaining surface contact stiffness based on the second-order characteristic frequency of the system; two single-degree-of-freedom unit subsystem coupling components are designed Two-degree-of-freedom vibration system, test separately and obtain the stiffness k of two single-degree-of-freedom unit subsystems 1 , ω 01 and k 2 , ω 02 , the contact stiffness value k can be obtained according to the natural modal frequency ω of the two-degree-of-freedom vibration system, which belongs to the non-destructive detection technology method; the adjustable device is designed, the contact pressure of the contact sample can be adjusted, and the parameters of the elastic system can be adjusted. Combine samples with different surfaces for contact stiffness detection; the test device is easy to adjust, easy to locate, and easy to replace, effectively ensuring the repeatability of the experiment.

The invention relates to a vibrating bumping pan. The vibrating bumping pan comprises a pan, a support and an electromagnetic vibrating apparatus, wherein the pan comprises a pan body, a front edge, a rear edge and an armature; the front edge is a semicircular edge formed by forwarding protruding the pan body, the rear edge is a semicircular edge formed by backward protruding the pan body, and the rear edge is provided with the armature; and the support comprises a handle, an elastic system, a circular ring and a support column, the circular ring is connected with the handle, the support column is connected with the circular ring, the pan is arranged on the support, the pan is connected with the support by virtue of the elastic system, the electromagnetic vibrating apparatus comprises an electromagnet, an armature and a diode, the electromagnet is arranged on the handle, and the diode is connected with the electromagnet. After a power supply switch is turned on, AC power rectified by the diode passes through the electromagnet, the electromagnet alternately has the process of generating a magnetic force to attract the armature and removing the magnetic force to release the armature, so that the pan is bumped back and forth towards the direction of the electromagnet.

The invention discloses an NLARI heart rate module-based heart and an autonomic nerve function assessment method. Heart rate variation is modeled via a non-linearity autoregression integration model describing a random elastic system; and heart rate feature indexes and assessment reference range can be derived via parameter-quantization of relative functions of the heart and the autonomic nerve via the model. An assessment system formed by the heart rate feature indexes can be derived in internal-external environment of a cardiovascular system; cardiovascular system and autonomic nerve function assessment can be provided including myocardial metabolism and function, autonomic nerve system and humoral balancing adjusting functions, metabolism level and changes; and cardiogenic stroke death risk indexes can be also improved. Approximate algorithm or chip elements for frequency-domain analysis can be unnecessary, so the method is convenient and high-efficient; and the method integrates biological signal analysis technology and communication network technology, so the whole people health industry development can be promoted.

A method for applying frequency resonance to electric power generation implemented by using the kinetic energy of a vehicle includes, a sprung vehicle body, through a free vibration at an inherent frequency thereof, exciting a hollow heavy-object supporting plate to have frequency resonance or effective vibration, in which the sprung vehicle body is provided with a vertical elastic system, the hollow heavy-object supporting plate is supported by the sprung vehicle body, also provided with a vertical elastic system, and equipped with a kinetic energy generator, and the inherent frequency of the hollow heavy-object supporting plate is same as or similar to that of the sprung vehicle body; the sprung vehicle body transfers the kinetic energy of vibration to the hollow heavy-object supporting plate and the hollow heavy-object supporting plate resonated by being excited drives the kinetic energy generator arranged on the hollow heavy-object supporting plate to generate electric power.

The invention discloses an ascending type movable formwork box beam concrete pouring construction method. A symmetrical balance pouring principle is adopted to pour concrete to elastic beam sections at the same time in a transverse manner and a longitudinal bridge direction manner; and the symmetrical balance pouring principle is adopted to pour concrete to non-elastic beam sections at the same time in a transverse manner and a longitudinal bridge direction manner. By the adoption of the ascending type movable formwork box beam concrete pouring construction method, a box beam structure is kept in an elastic system state, finally a unified whole is formed, the quality problems that box beams near a middle cross beam are not coordinative, and deformation and cracks are generated are effectively solved, deformation structure cracks and cold seams are effectively prevented from being generated in the pouring process, and the box beam construction quality is effectively guaranteed. The box beams are poured according to the symmetrical balance principle, it is guaranteed that a movable formwork is loaded in a balanced manner, and safety and reliability are achieved. Construction resources are configured reasonably, the pouring process is not intercepted, the construction speed is high, the mechanical use rate is high, and the construction efficiency is high.

The invention provides a method for calculating transient and stable state response of an elastic system under non-stable signal effects. The method includes decomposing non-stable signal into j-layer wavelet packets to obtain 2j wavelet packet components of different frequencies, fitting the wavelet packet components into simple harmonic waves through linear amplitude modulation to obtain fitted simple harmonic waves corresponding to the wavelet packet components, deriving analytic solution of structural response of the elastic system under different fitted simple harmonic wave effect, carrying out a reverse process for linear amplitude modulation of the structural response under the fitted simple harmonic waves effects and calculating transient response and stable state response of the wavelet packet components, superposing the obtained transient response and stable state response of the wavelet packet components, and calculating transient and stable state response and complete response solution of the elastic system under non-stable signal effects. The method effectively calculates transient and stable state response and complete response solution of the elastic system under non-stable signal effects, and lays foundation for further researching transient response.

The invention relates to a calibration device for a fiber Bragg grating vibration sensor and an uncertainty analysis method of the calibration device and belongs to the technical field of calibrationof vibration sensors. According to the method, a calibrated fiber Bragg grating vibration sensor and a standard fiber Bragg grating vibration sensor are fixed at the center of a vibration table back to back; a signal generator emits a sinusoidal vibration signal, signal amplification is carried out on the sinusoidal vibration signal and the vibration table vibrates at a certain frequency through the sinusoidal vibration signal; the two fiber Bragg grating vibration sensors bear the same vibration signal, but output different output quantities; the sensitivity of the calibrated fiber Bragg grating vibration sensor is calculated by using the linear variation relation between acceleration and wavelength changes of fiber Bragg gratings in an elastic system through comparing and analyzing two groups of output quantities, thereby achieving calibration of the fiber Bragg grating vibration sensor; and type A uncertainty and type B uncertainty are analyzed and synthesized, thereby achieving uncertainty analysis of the fiber Bragg grating vibration sensor.