摘要:
A system for detecting a voltage and/or current of a single phase and/or polyphase alternating current includes a sample-hold circuit that detects and holds instantaneous values of a plurality of sampling points over a fixed time period of the alternating current as sampled values. A first calculation circuit calculates the real part and the imaginary part of the Fourier coefficient with respect to a fundamental wave and/or a component of the positive-phase sequence of the alternating current detected from the plurality of sampled values thus held and outputs respective calculated values thereof. A second calculation circuit performs a predetermined calculation to the calculated values of the real and imaginary parts and thereby calculates and outputs the amplitude of the fundamental wave and/or component of positive-phase sequence of the alternating current.
摘要:
An industrial expert system for use in designing a plant system or device thereof and in fault detection, includes a knowledge base having a rules-section for describing deductive inference rules. Also included is an expression-section for describing a calculation formula of equality with either a right side or left side being a simple term having a value and the other side being polynomial including known functions. Also included is an attributes-section for declaring the nature and value of each of the attributes cited in calculation and inference and for declaring parameters for controlling communication between a process of deductive inference and a calculation process according to calculation formulas. A deductive inference engine performs deductive inferencing on the basis of the rules, calculation formulae and the attributes stored in the knowledge base. This system uses a simple construction to efficiently perform detection of fault logic by using specific formula or calculation of parameters representing features of a fault which are to be performed during an inference.
摘要:
A gold alloy for black coloring comprising gold and at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti, a gold alloy for black coloring having the composition described above and further comprising at least one alloying element selected from the group consisting of Pt, Pd, Rh, Ir, Ru, Os, Ag, and Ni; a method for the production of a processed article of gold alloy possessing a black surface layer by the steps of shaping the gold alloy mentioned above, heat-treating the shaped gold alloy, and cooling; and processed article of gold alloy obtained by the method.
摘要:
A method for forming a ceramic coating on a substrate comprises immersing the substrate such as stainless steel in an aqueous solution containing a silicic acid compound such as sodium silicate and/or a metal salt of oxygen acid such as an aluminate, and irradiating the substrate with a laser beam. By this method, a dense and fine ceramic coating can be uniformly formed on the substrate without using an apparatus of large scale required in the gas phase method and without heating the system to a high temperature.
摘要:
Input data is divided into a plurality of blocks, and the blocks are corresponded to each address of the lookup table, and a block is divided into a plurality of sections according to the change of the output data, and at this time position information to indicates the boundary of the section, and output data in each section are stored in an address corresponding to each block, so that the memory capacity required for the lookup table can be decreased.
摘要:
Input data is divided into a plurality of blocks, and the blocks are corresponded to each address of the lookup table, and a block is divided into a plurality of sections according to the change of the output data, and at this time position information to indicates the boundary of the section, and output data in each section are stored in an address corresponding to each block, so that the memory capacity required for the lookup table can be decreased.
摘要:
A cyclic equation setting unit transforms and sets a Taylor series equation for calculating a sine function into a single cyclic equation common to terms of the Taylor series equation, the single cyclic equation having a new known number Q that is defined by multiplying a known number Q and the square of a variable X, shifting the result by a shift number Sand then adding a constant K thereto. An adjustment unit adjusts and prepares the shift number S such that within a variation range of the variable X the variable X has a maximum value 1 with the constant K being not greater than 1. A cyclic equation executing unit inputs and converts angle information i to the variable X, and executing the cyclic equation in sequence from higher order term to lower order term for the number of terms of the Taylor series equation to derive a sine function of the angle information i.
摘要:
A commutation compensation device for a DC machine of the type in which in addition to an interpole coil for the armature current flow, an interpole is provided with an auxiliary interpole coil and in response to a reference exciting current calculated based on the rate-of-change of the armature current, the exciting current for accomplishing the commutation compensation is caused to flow through a controlled DC power source to the auxiliary interpole coil. In order to further improve a degree of commutation compensation, when the commutation is degraded, the armature current adversely affecting the commutation, the rate-of-change of the armature current and so on are automatically calculated and evaluated by commutation degradation rate calculator, whereby a commutation compensating rate is automatically obtained and in response to the commutation compensating rate the corrected exciting current is delivered to the auxiliary interpole coil.
摘要:
A communication device includes a storage unit that stores a predetermined eye mask pattern indicating a receivable range, a receiving unit that receives data from the other communication device, a waveform comparing unit for comparing a waveform of the received data with the eye mask pattern to generate comparison result data and a transmission unit for transmitting the comparison result data to the other communication device.
摘要:
A cyclic equation setting unit transforms and sets a Taylor series equation for calculating a sine function into a single cyclic equation common to terms of the Taylor series equation, the single cyclic equation having a new known number Q that is defined by multiplying a known number Q and the square of a variable X, shifting the result by a shift number S and then adding a constant K thereto. An adjustment unit adjusts and prepares the shift number S such that within a variation range of the variable X the variable X has a maximum value 1 with the constant K being not greater than 1. A cyclic equation executing unit inputs and converts angle information i to the variable X, and executing the cyclic equation in sequence from higher order term to lower order term for the number of terms of the Taylor series equation to derive a sine function of the angle information i.