104 results about "Mass spring" patented technology

The invention relates to an object deformation real-time simulation graphic processing technique, particularly a soft tissue deformation simulation method based on coupling of mesh-free Galerkin and mass spring, which comprises the following steps: in the pretreatment process, establishing a linear viscoelasticity biomechanical model for soft tissues; in the deformation computation process, dynamically partitioning a mesh-free region and a mass spring region according to the load carried by the soft tissues, establishing a transitional unit of the connection region between the mesh-free region and mass spring region, and constructing a transitional unit approximation displacement function, thereby implementing self-adapting coupling of a mesh-free Galerkin method and a mass spring method;and in the after-treatment process, outputting the state of the mass or node of each time step in the deformation process onto a screen, carrying out illumination rendering, and finally displaying the real-time deformation process of the soft tissue organ under stressed conditions on the screen, thereby implementing visualization effect of dynamic deformation. By utilizing the advantage of high efficiency in the mass spring method and the advantages of high precision and no need of mesh reconstruction in the mesh-free Galerkin method, the invention overcomes the defect that the Galerkin method is not suitable for solving a large-scale problem, thereby effectively lowering the complexity of computation in the soft tissue deformation simulation and enhancing the operation efficiency.

Apparatus and methods for acoustically isolating logging tool receiver and transmitter sections. One or more modular isolators is arranged between the receiver and transmitter sections. The modular isolators comprise a high tensile strength while also providing for a high wave attenuation level. The modular isolators are mechanical mass-spring systems capable of absorbing acoustic waves propagating along the logging tool. The mass is a swinging sleeve, and the spring includes a Belleville spring stack. The use of the strong modular isolators provides acoustic isolation between the transmitters and receivers for the complete sonic frequency band at multiple modes.

The invention relates to a diamond nitrogen-vacancy (NV) center-based acceleration sensor. Through high-NV center concentration diamond as a magnetic field sensing element, Rabi-flopping frequency of an NV center ensemble electronic two-level energy system produced by laser pulse is measured by an optical detection magnetic resonance (ODMR) so that under the action of extraneous acceleration, high-precision measurement of a variable magnetic field produced by change of relative displacement of a magnetostatic field and high-NV center concentration diamond is realized and thus acceleration information measurement is realized. Through combination of a traditional acceleration sensor mass-spring structure, a micro-nano light-machine-electricity technology and a diamond NV center quantum manipulation principle and use of the diamond NV center in the ultrahigh precision magnetic field measurement, the acceleration sensor member with a small volume, an ultrahigh precision, high sensitivity and a large measurement scope is obtained. The acceleration sensor has an important value in an accelerometer and a gravimeter.

MEMS mass-spring-damper systems (including MEMS gyroscopes and accelerometers) using an out-of-plane (or vertical) suspension scheme, wherein the suspensions are normal to the proof mass, are disclosed. Such out-of-plane suspension scheme helps such MEMS mass-spring-damper systems achieve inertial grade performance. Methods of fabricating out-of-plane suspensions in MEMS mass-spring-damper systems (including MEMS gyroscopes and accelerometers) are also disclosed.

A supporting device for supporting in a lithographic projection apparatus a supported part relative to a supporting part, is presented. The supporting device includes a first part that engages the supporting part of the lithographic projection apparatus; a second part that engages the supported part of the lithographic projection apparatus; a supporting spring system disposed between the first part and the second part; and a position control system configured to control a position of the supported part. The position control system comprises at least one reference object that is movable relative to the supporting part; a reference support device that supports the reference object relative to the first part, wherein the reference object and the reference support device form a reference mass-spring system; at least one position sensor that detects at least one attribute of the position of the second part relative to at least one of the reference objects, the position sensor including a sensor output for outputting a position signal representing at least one of the attributes; and an actuator, communicatively coupled to the position sensor, that is configured to adjust the position of the second part relative to the first part, in response to the position signal.

The invention relates to a damping arrangement for dissipating oscillation energy of an element in a system, more particularly in a microlithographic projection exposure apparatus, comprising an absorber mass, which is mounted via a stable mounting with respect to the element, wherein the absorber mass is arranged in a cavity present within the element and is at least partly surrounded by a fluid situated in the cavity, wherein a mass-spring system is formed by the absorber mass, the system damping a translational movement component of an oscillation of the element that exists at the linking point of the absorber mass, and wherein the stable mounting is formed by a rheological fluid that is electrically controllable or controllable via electric or magnetic fields.

A formation logging tool having a substantially continuous central mandrel with regularly spaced mass blocks disposed thereon, at least some of the mass blocks carrying sensors such as receivers. By adopting this structure, the tool can be made to behave as a mass-spring structure and its flexural and extensional behaviour controlled such that its dispersion curve does not extend into the dispersion curve of the formation to be logged. The structure can be applied to the whole of the logging tool or just to the receiver section and/or any spacer section between the receiver and the transmitter section.

A method of forming a micromechanical resonator includes forming a resonator body anchored to a substrate by at least a first anchor. This resonator body may include a semiconductor or other first material having a negative temperature coefficient of elasticity (TCE). A two-dimensional array of spaced-apart trenches are provided in the resonator body. These trenches may be filled with an electrically insulating or other second material having a positive TCE. The array of trenches may extend uniformly across the resonator body, including regions in the body that have relatively high and low mechanical stress during resonance. This two-dimensional array (or network) of trenches can be modeled as a network of mass-spring systems with springs in parallel and/or in series with respect to a direction of a traveling acoustic wave within the resonator body during resonance.

The invention discloses a plate or bridge structure of a local resonance acoustic black hole (ABH). The local resonance acoustic black hole structure comprises an acoustic black hole region (a region which is gradually thinned), a local vibrator (such as a mass spring unit) and an acoustic black hole extension part. According to the local resonance acoustic black hole structure disclosed by the invention, the local vibrator is constituted by units having the properties of a spring vibrator, so that an effective action frequency range of an acoustic black hole effect is reduced, and subsequently, a vibration control effect of the acoustic black hole structure is effectively improved. The local resonance acoustic black hole structure disclosed by the invention has a broad application prospect in vibration absorption and noise reduction of structures.

A vibration damper for a semiconductor wafer handling arm includes a spring and a mass coupled to the spring to form a mass spring system that is tuned to vibrate at a structural resonant frequency of the vibrating wafer handling arm. The spring has temperature insensitive spring characteristics and the mass and spring are constructed of materials that do not outgas or produce contaminants in a semiconductor processing environment. The mass spring system is preferably a cantilever beam spring connected to a high response point on the vibrating arm and oriented to vibrate in a plane perpendicular to the plane of the wafer. The mass is preferably slidably adjustable along the length of the cantilever beam spring to adjust the resonant frequency of the vibration damper. Vibration damping of the wafer handling arm is accomplished by the transfer of kinetic energy from the vibrating wafer handling arm to the mass spring system.

A method for generating electrical power from an acceleration of an object is provided. The method including: vibrating a mass-spring unit upon an acceleration of an object; transmitting a force resulting from the acceleration from the mass-spring unit to the one or more piezoelectric elements; converting the vibration of the mass-spring unit to an electrical energy; and calculating at least one of the force and acceleration based on an output of the one or more piezoelectric elements.

A sound attenuating trim part, including at least one insulating area with an acoustic mass-spring characteristics having at least a mass layer and a decoupling layer adjacent to the mass layer, whereby the mass layer consists of a porous fibrous layer and a barrier layer, with the barrier layer being located between the porous fibrous layer and the decoupling layer and all layers are laminated together, and whereby the porous fibrous layer at least in the insulating area has adjusted dynamic Young's modulus (Pa) such that the radiation frequency of is at least 3000 (Hz).

The invention relates to a rotation acceleration meter for earthquake. The meter comprises a shell and a bottom plate. A spoke type mass spring device, two groups of symmetrically and reversely installed swinging type differential capacitive transducers, two groups of moveable coil dampers and a circuit board are arranged in the shell. The spoke type mass spring device is located between the two groups of swinging type differential capacitive transducers which respectively comprise an outer moveable polar plate, an inner moveable polar plate and a fixed polar plate. The circuit board comprises two capacitor voltage converting circuits, two conditioning circuits, a synthetic circuit and two damp adjusting circuits. The rotation acceleration meter for earthquake provided by the invention is compact in structure, reasonable in design, high in monitoring precision, good in reliability and wide in application range.

The invention provides a hybrid modeling method of a virtual flexible cable, and belongs to the technical field of flexible object modeling. The cable is divided into N sections, sub-cables which require high static attitude fidelity are modeled by an energy optimization method, the sub-cables which require high dynamic real-time attitude fidelity are modeled by a mass spring method, a constraint that two sub-cable segments connected on a connection point pass the same fixed point, and a constraint that the two connected sub-cable segments on the connection point have the consistent tangent direction are set, and finally, a hybrid model of the flexible cable is determined. The cable constraints including an endpoint constraint and a hoop constraintare processed according to practical situations. By means of the hybrid modeling method, the instantaneity requirement of virtual environment on a cable moving posture can be met, the physical properties of the cable can be considered as much as possible in a cable model, the authenticity of the flexible cable model is improved and a support for subsequent virtual cable layout, assembling, final assembly troubleshooting and maintenance simulation is provided.

A soundproofing assembly includes stacked layers in the form of a first set of layers (36) having good resistance to the passage of air, and a second set of layers (24) with mass-spring function including a layer (28) having a heavy viscoelastic mass and a spring type layer (26); the first set of layers includes a layer (36) of a foam with open cells of high porosity, high tortuosity and good resistance to the passage of air, the layer (36) having, owing to its high tortuosity, excellent sonic absorption properties at medium and high frequencies. The invention is useful for soundproofing motor car passenger compartments.

The invention discloses the design and a structure for a self-lock type rail bottom dynamic vibration absorber. An elastic element (3) is paved under a steel rail (1); the middle part of the elastic element is buried with one or more resonant mass blocks (4, 5) in an adhesion mode or an non-adhesion mode; the mass and the distribution positions of the resonant mass blocks are optimized according to the maximum vibration-absorbing amplitude; the elastic element and the resonant mass blocks form a multi-mode dynamic resonant mass-spring unit; and a self-lock type magazine clip (2) passes through the elastic element along the vertical direction of the steel rail and then is clamped at side edges of both ends of a rail root of the steel rail to firmly lock the elastic element on the bottom of the steel rail; when the steel rail vibrates, the dynamic resonant mass-spring unit produces the resonance, thereby realizing the suppression to the vibration of the steel rail and the transfer and absorption to vibration energy, attenuating the amplitude of the steel rail, and reducing the noise radiation of the steel rail caused by the vibration; at the same time, the design can also inhibit the generation and increase of the waviness corresponding to resonant frequency bands of the wave of the steel rail, thereby controlling the excitation of the waviness of the steel rail to a wheel rail and the produced vibration and noise, reducing the action force of the wheel rail, and increasing the riding comfortableness .

The present invention aims to achieve accurate measurement and evaluation of mechanical properties of an object to be measured 1 without use of a force sensor. A weight 3 is attached to the object to be measured 1 to form a mass-spring system in which the object to be measured 1 serves as a spring element. Then vibration is applied to the mass-spring system to measure the inertial force acting on the weight 3 and the displacement of the weight 3 so that the mechanical properties of the object to be measured 1 will be evaluated based on the inertial force and displacement. A light wave interferometer 6 measures the displacement velocity of the weight 3 to calculate the inertial force from the acceleration determined by differentiating measured values of the displacement velocity of the weight 3 and calculate the displacement of the weight 3 by integrating the measured values of the displacement velocity of the weight 3.

The invention discloses a method for calculating a sound absorption coefficient of a porous material, comprising the following five steps: Step 1: the sound absorption model of the single hole is equivalent, including obtaining the stiffness k of the single hole sound absorption equivalent model based on the analogy equivalent theory of the acoustic force line, and obtaining the damping loss factor eta through the sound absorption simulation calculation of the single hole; Step 2: creating a random distribution function, generating a 3D Voronoi diagram in Matlab software, and getting the coordinates of the point; Step 3: performing modeling with the Java language combined with Matlab and finite element analysis software; Step 4: establishing a spatial random array mass-spring-damping system equivalent model of the porous material; Step 5: performing simulation analysis to obtain the energy loss curve, that is, the sound absorption coefficient curve. The invention can establish an acoustic equivalent model of the porous material which is simple and applicable, and simplifies the complicated calculation of the sound absorption performance of the porous material; the method reduces the design and experiment cost, and accelerate the development speed of the product.