185 results about "Mass balance" patented technology

A universal joint comprising a pair of circular waveguide ball-joints and a slip-joint allows for simultaneous 3-axis rotation and 3-dimensional translation between an antenna and a stationary source. As such, the universal joint does not have to be physically aligned with the azimuth, and elevation, rotation axis of the antenna and mounted on the gimbal support, greatly simplifying the antenna steering mechanism. The universal joint allows the antenna to be mass-balanced in relation to the azimuth and elevation axis without adding any additional counter weights, thus reducing the size and power requirements of the azimuth and elevation rotation drive systems. Additional ball-joints may be provided to increase the allowed range of motion of the antenna.

The present invention is a method for optimizing operating conditions for yield, purity, or selectivity of target species, and/or processing time for crossflow membrane filtration of target species in feed suspensions. This involves providing as input parameters: size distribution and concentration of particles and solutes in the suspension; suspension pH and temperature; physical and operating properties of membranes, and number and volume of reservoirs. The method also involves determining effective membrane pore size distribution; suspension viscosity, hydrodynamics, and electrostatics; pressure-independent permeation flux of the suspension and cake composition; pressure-independent permeation flux for each particle and overall observed sieving coefficient of each target species through cake deposit and pores; solving mass balance equations for all solutes; and iterating the mass balance equation for each solute at all possible permeation fluxes, thereby optimizing operating conditions. The invention also provides a computer readable medium for carrying out the method of the present invention.

A management system for improving operation of a plant. A server is coupled to the management system for communicating with the plant via a communication network. A computer system has a web-based platform for receiving and sending plant data related to the operation of the plant over the network. A display device interactively displays the plant data. An optimization unit is configured for optimizing at least a portion of a refining or petrochemical process of the plant by acquiring the plant data from the plant on a recurring basis, analyzing the plant data for completeness, correcting the plant data for an error. The optimization unit corrects the plant data for a measurement issue and an overall mass balance closure, and generates a set of reconciled plant data based on the corrected plant data.

The invention relates to a mass balancing device and method for a lower limb rehabilitation training patient. The balancing device comprises a reduced gravity generating mechanism, a bracket, an electric winch, a steel wire rope, a pulley wheel, a force sensor, a suspender, a running machine and a control system. When a reduced gravity walking training is carried out, the patient wears the suspender to stand on the running machine; the suspender is connected to the steel wire rope through the pulley wheel and two ends of the steel wire rope are respectively mounted on the reduced gravity generating mechanism and the electric winch; and the size of the actual reduced gravity detected by the force sensor is fed back to the control system to realize closed-ring control. Aiming to the patient of lower limb motor dysfunction caused by central nervous system diseases including spinal injuries, brain stroke and the like, a load to lower limbs of the patient which is caused by the self-gravity of the patient and the dynamic load in the walking process can be simultaneously relieved when the reduced gravity walking training is carried out, so as to realize constant-mass gravity reduction. According to the rehabilitation conditions of the patient or the training requirements, a weight reducing device provided by the invention can conveniently adjust a gravity reducing ratio. The suspender of the weight reducing device can be moved along the gravity center of the patient in real time and is good for the rehabilitation of normal physiological gaits of the patient.

The present invention provides a fluorescence-based modeling method that is capable of capturing the dynamic changes of different membrane foulant fractions that occur in fluid filtration operations. Principal component analysis is utilized to de-convolute spectral information captured within fluorescence EEMs into principal component scores that are related to different known foulant groups. The principal component scores are then used as states within a system of differential equations representing approximate mass balances of the main foulant groups to obtain a dynamic forecasting of membrane fouling. Based on the fouling dynamics forecasted by this modeling method, an optimization strategy can be developed for estimating the optimal membrane back-washing scenario for minimizing energy consumption while maximizing clean fluid production.

A method of determining a concentration of a component in a flow from a single source or layer contributing to a total flow is described using the steps of repeatedly changing the relative flows from the source; and for each of the changed relative flows determining the combined flow rate and a total concentration of the component of the total flow until sufficient data points are collected to solving a system of mass balance equations representing the flow of the component from each source at each of the changed flow rates.

A double-workpiece-table same-phase rotation exchange method and a device based on follow-up rotation-resisting mechanisms belong to technology of semiconductor manufacturing equipment. The device comprises two workpiece tables, a rotation transfer table and two follow-up rotation-resisting mechanisms, the rotation transfer table captures and clamps the two workpiece tables to rotate around a base station center in a rotation exchange process of the two workpiece tables, exchange of an exposure work position and a pretreatment work position is achieved, and the follow-up rotation-resisting mechanisms control autoroatation of the two workpiece tables so that same phase position of the two workpiece tables is guaranteed in a table exchange process. The double-workpiece-table same-phase rotation exchange method and the device solve the problem that the existing linear table exchange scheme has plenty of table exchange beat and large impact torque, the existing rotation table exchange scheme is reverse in phases of sensors and marking plates of two workpiece table and twining in cables, targets of a laser interferometer lose, and the like. The double-workpiece-table same-phase rotation exchange method and the device adopt a small mass balance system, are favorable to shortening balance time, simultaneously simplify a system, lower cost, reduce table exchange beat, shorten table exchange time, and effectively improve productivity of lithography machines.

The invention discloses a determination method of copperplate heat flux based on mass balance and heat balance continuous casting mould, which belongs to the field of numerical calculation and application in ferrous metallurgical continuous casting process. The method comprises the steps of (1) acquiring raw data, (2) acquiring the consumption rate of mould powders,(3) acquiring molten slag layer thickness (d1) and solid slag layer thickness (ds) by utilizing the equation models of mass balance and heat balance,(4) acquiring heat-flow density q, (5) constructing the physical model of crystallizers, calculating thermocouple temperature Tc and comparing the calculated value Tc with the measured value Td. The above method has the advantages of coupling the mass balance of mould powder consumption and the energy balance of molten steel heat transfer. According to the method of the invention, specific boundary condition equations are obtained by regression method after the temperature and heat flow value of specific locations being determined, without being heavily dependent on specific equations of heat transfer boundary.

A multi-scale finite volume method for simulating a fine-scale geological model of subsurface reservoir is disclosed. The method includes providing a fine-scale geological model of a subsurface reservoir associated with a fine-scale grid, a coarse-scale grid, and a dual coarse-scale grid. A coarse-scale operator is constructed based on internal cells, edge cells, and node cells on the fine-scale grid that are defined by the dual coarse-scale grid. Pressure in the dual coarse-scale cells is computed using the coarse-scale operator. Pressure in the primary coarse-scale cells is computed using the computed pressure in the dual coarse-scale cells. A display is produced using the computed pressure in the primary coarse-scale cells. An iterative scheme can be applied such that the computed pressure in the primary coarse-scale cells converges to the fine-scale pressure solution and mass balance is maintained on the coarse-scale.

A method, device and assistance system for detecting leaks in an area of a supply network, wherein leaks are detected by comparing real measured values supplied by sensors with measured values ascertained using a Monte Carlo simulation and, in particular, the method ascertains irregularities, which can be attributed to anomalies such as leaks, based on a hydraulic analysis so that existing leaks can be detected. Furthermore, the method can be applied to sensors that are temporarily installed in the network, giving the network operator additional freedom in the leak detection, and can be used for other supply networks and infrastructures.

An artificial gravity system and method for a spacecraft including a least one pair of rotatable stages wherein each stage is capable of rotating about at least one structural support in the spacecraft and wherein the rotatable stages in each pair of rotatable stages counter-rotate one another wherein each stage is capable of accommodating a plurality of occupants. The stages may be circular and deployable. The system may also include dynamic balance equipment in each stage consisting of a fluid redistribution design utilizing fluid pumping systems, storage- and reserve-volume tank pairs to redistribute fluid throughout each stage for optimal mass balance, stage- and spacecraft-mounted laser-tracking equipment for redundant speed measurement, drive assembly and a brake motor and wheel assembly, foldable structural support arms capable of reducing the radial space of each stage during takeoff, and an inertial measurement unit capable of detecting overall vehicle rotational rates.

The invention discloses a multifunctional link dynamic experiment platform, which comprises a platform base, a power and transmission mechanism, link mechanisms and a data acquisition mechanism, wherein through different link combinations, the following four kinds of link mechanisms are adopted in the invention: 1, a link mechanism which achieves complete balance by using mechanism balance; 2, a link mechanism which achieves complete balance by using mass balance; 3, a link mechanism which achieves partial balance by using mechanism balance; and 4, a link mechanism which achieves partial balance by using mass balance. The experiment platform disclosed by the invention is simple in structure, and can clearly demonstrate the kinematic principle and dynamic principle of each link mechanism; and besides rigid links, the links in the invention also can adopt elastic links which can be used for testing the elastic dynamic performances of the link mechanisms.

An air-fuel ratio control apparatus estimates, on the basis of an exhaust air-fuel ratio of exhaust gas flowing into an exhaust purifying catalyst unit disposed in an exhaust passage of an engine, an emission of at least one specific component contained in exhaust gas flowing out of the exhaust purifying catalyst unit. The air-fuel ratio control apparatus performs the estimation by use of a model, and controls the air-fuel ratio in such a manner that the estimation value reaches a target state. The model is previously determined in consideration of the mass balance of the specific component.

The invention relates to a soft sensing method for true temperature of pyrolysis mixed products at the outlet of an ethylene cracking furnace, comprising the following steps: firstly obtaining the furnace tube parameters of the cracking furnace; then obtaining the information of cracking raw material; then calculating the composition of pyrolysis products at the outlet of the cracking furnace; according to a cracking process model, including mass balance equation, momentum balance equation and energy balance equation, calculating the composition profiles of the pyrolysis products at the outlet of a radiant section; then calculating coking thickness in a cracking furnace tube; calculating coking thickness in a adiabatic segment furnace tube according to the contents of small molecule unsaturated hydrocarbon and aromatic hydrocarbon in the pyrolysis products and running time; and finally calculating the difference value of the temperature of a measurement and control point and the true temperature of pyrolysis mixed products so as to calculate the true temperature of pyrolysis mixed products at the outlet of the ethylene cracking furnace. Through the method, the true temperature of gas mixture of pyrolysis products at a particular moment of time can be dynamically calculated, and accurate model of the ethylene cracking furnace can be established, so that the method provides the basis for the simulation, optimization and control of cracking process.

To cope with requirements for strict accuracy of crankshafts while alleviating the task of controlling a forming process, a preliminary machining step (S117) is added before primary mass balance measurement (S118) prior to boring of center holes into opposite end surfaces of a crankshaft mold. In the preliminary machining step (S117), balance weight portions of the crankshaft mold are machined.

A method for modeling and simulating an air separation system of an integral gasification combined cycle power plant comprises the following steps: building up an accurate mathematical model of a rectifying tower according to mass balance, energy balance, gas-liquid phase balance, molecular normalization equation and physical property equations set of each tower tray; and carrying out simulation experiment for the air separation system, including the cold-state startup process of the rectifying tower and the operation under variable working conditions, so as to study the dynamic operating characteristics of the rectifying tower, as well as the dynamic, static and coupling relations among the input, the output and the disturbance variables of the system. The method is considerably helpful for further understanding the operating characteristics of the air separation system, setting a control strategy for the air separation system and optimizing the operation. Moreover, the method can bring out profound impacts on the further study of the cooperative control of the air separation oxygen-generating system and other parts of the integral gasification combined cycle power plant, and an integral optimization design for the entire power plant.

The invention belongs to the technical field of vehicle measurement and particularly relates to a two-axle vehicle centroid height static measurement method. According to the technical principle, firstly, when a vehicle axle load changes, a tire flattening radius and a suspension deform, sprung mass and unsprung mass centroid heights change, and respective variations are measured through the scoring method; secondly, the geometrical relationship between the variations is determined according to the relationships between different inclination angles and front and rear axle loads of a vehicle, the torque balancing principle and the mass balancing principle, torque extraction is conducted on contact points of front wheels of the vehicle and the ground, a torque balancing equation is built, and the whole vehicle centroid height and the sprung and unsprung mass centroid heights of the vehicle in the horizontal placement state are obtained. The suspension does not need to be fixed, people only need to measure multiple sizes to avoid tedious labor and safety accidents caused by suspension fixing, and the measurement method is simple, economical, precise and widely applicable to two-axle vehicles.

An improvement and method for improved structural dynamic stability for 20 and 30 Series Learjets are disclosed. The improvement includes a redistribution of the elevator mass balance to uncouple the elevator rotational motion from the stabilizer translation motion for the higher order horizontal frequencies having node lines in the proximity of the mass outboard counterbalance weights. The original tail section includes a rudder, and a horizontal stabilizer supporting an elevator mounted adjacent the rudder. The elevator includes a proximal end adjacent the rudder and a distal end that includes a counterbalance portion. The improvement includes replacement of an original mass counterbalance weight from within the counterbalance portion with a new mass counterbalance weight of less mass, and the inclusion of additional mass counterbalance weights disposed within the elevator and interposed between the proximal end and the counterbalance portion.