巻号一覧
7 巻 (1971)
- 6 号 p. 499-
- 5 号 p. 393-
- 4 号 p. 295-
- 3 号 p. 197-
- 2 号 p. 99-
- 1 号 p. 1-
7 巻, 3 号
選択された号の論文の14件中1～14を表示しています
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渡部 慶二, 中津山 幹男1971 年 7 巻 3 号 p. 197-204
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーFrequency range of a pen-writing oscillograph is limited to be from DC to about 80Hz because of the response of the galvanometer. If the high frequency signal is known to be periodic, it can be sampled and its frequency can be converted to a low frequency preserving its waveform. Thus the input signal can be recorded by a pen-writing oscillograph. The input waveform is necessary to be continuously sampled for a long time in the pen-writing oscillograph. In a sampling oscilloscope, however, the sampling operation is not continuous, because each sampling pulse is taken at a time progressively delayed with respect to some reference point in the input waveform and the delay time is not infinite.
In this paper, a new sampling technique for a pen-writing oscillograph is discussed. In this technique, sampling pulses are periodically taken. The frequency of the output signal after sampling is equal to the difference between P·Fs and the frequency of the input signal. Fs is the sampling frequency and P is a positive integer. The input waveform can be continuously sampled for a long time. However, the frequency drift of the output signal increases as the frequency of the output becomes lower.
In this paper, this new sampling technique is applied to a chopper amplifier and a frequency control system is contrived in order to compensate the frequency drift.
By the pen-writing oscillograph with this chopper amplifier, it is possible to record from DC to periodic signals of high frequency.抄録全体を表示PDF形式でダウンロード (1031K) -
柏木 濶, 灘吉 一隆1971 年 7 巻 3 号 p. 205-210
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーWhen an M-sequence signal is used as an input to a system to be identified, the crosscorrelation of input and output gives approximately the system impulse response provided that the shift pulse period T of the M-sequence generator is sufficiently small. However, if T is not so small, the crosscorrelation function no longer gives the impulse response.
In this paper, the effect of T on the crosscorrelation function is calculated in the case where the system is of second order. And it is shown that, with only the gain correction, the crosscorrelation function can approximate the impulse response within the error of 3%, when ωnT≤0.6where ωn is the natural frequency of the system. On the basis of this fact, a simple and practical method for system identification is described. In this method, no delay elements are used and the delay time is changed by varying T and by using several logic multipliers.
The results of analog computer simulation agreed well with the theoretical considerations.抄録全体を表示PDF形式でダウンロード (672K) -
須藤 二全, 篠宮 栄1971 年 7 巻 3 号 p. 211-218
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーThe purpose of this paper is to report the effect of the rotating velocity on the angular acceleration characteristics of the 2-phase accelerometer driven with a fluctuating velocity caused by a superposition of a constant speed rotation and a stationary sinusoidal vibration.
By using an elementary machine model, the basic equation of the performance characteristics is derived theoretically and it is shown that, in comparison with the previous paper's equation, the constant rotating speed has influences only on the rotor impedance. Then, representing this impedance by the normalized parameters such as Qi and Q0, which are composed of the vibration frequency, the rotating velocity and the rotor time constant, a general discussion on the performance characteristics is given in detail with numerical examples.
As a practical application, the alternating torque of 2-phase servomotor under an unbalanced voltage supply was measured with the test accelerometer. The experimental results was in good agreement with the calculated results.抄録全体を表示PDF形式でダウンロード (1079K) -
伊藤 登, 池野 和夫, 五郎川 達, 高田 勝1971 年 7 巻 3 号 p. 219-225
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーThe high speed fail safe element is an urgent need of the day, especially in the field of traffic control such as that used on a railway or a highway. This is because the present magnetic relay control system widely used in the market may become unsatisfactory as the required control speed is drastically increasing. Few kinds of electronic fail safe elements have been reported, one is the fail safe threshold logical operational oscillator using resistors and semiconductors whose output voltages+V and -V (|V|>threshold voltage) correspond to the truth values 1 and 0 respectively, and the voltage less than the threshold voltage corresponds to the truth value 1/2. Another is the subharmonic oscillator called parametron whose 0 and π correspond to the truth values 0 and 1 respectively. The failure of an element and a circuit resulting in no voltage is covered by the following element whose constant signal is always monitored. The operational oscillator is excellent in the idea but the element is complicated and expensive, the subharmonic oscillator is simple but large in size and slow in speed because of the ferrite core.
Here aiming at accuracy, high speed, small size and low cost, we haved eveloped a thin permalloy film parametron to replace the ferrite parametron. The permalloy film is deposited onto a piece of phosphorous bronze wire 0.47mm in dia.. The film is 1μm thick and has a composition of 81 Ni-Fe with uniaxial anisotropy in circumference, and the anisotropy magnetic field is about 200AT/m. To investigate the quality, we built a fail safe control equipment using 325 thin film parametron elements and 28 magnetic control relays. As a result of this study, we find the fail safe element using thin film parametron is very accurate under a clock frequency of 50kHz and is cheap and small.抄録全体を表示PDF形式でダウンロード (1524K) -
有吉 久比古1971 年 7 巻 3 号 p. 226-231
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーThe proportional voltage method is to-day prevailingly used to measure the individual synchro error. The error measured by this method is called the electrical error. The synchro electrical error has two principal frequency components. One is the space harmonic component of the magnetic flux distribution such as the 6th harmonics or the 12th. The other is the 2nd component due to the unbalance of induced secondary voltages in the 3 phase windings.
The relation between the unbalance factors K, δ and the maximum value of electrical error can be derived from the equations of the proportional voltage method. The mutual relations between the unbalance factors based on the different reference phases are also calculated in this paper.
There is no precise rule to select the reference phase from among the terminals S1, S2, S3 of the synchro stator windings. It is proposed that the preferable domain is the 120° sector, the center line of which is the K-axis in K>1 on the Kδ diagram. A positive maximum value shall lie in the interval between 15° and 75° of the synchro error curves. Thus the suitable use of the 2nd harmonic characteristics of the synchro error results in minimizing the synchro system error.抄録全体を表示PDF形式でダウンロード (671K) -
米沢 勗, 仁木 栄次1971 年 7 巻 3 号 p. 232-238
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーIn a nondispersive infrared gas analyser employing the zero-method positive filter, the radiation screening of the null balance shutter is calculated as the function of the cell length l, the total pressure P and the partial pressure of absorber Pa. Primarily we used Elsasser model and supposed all the infrared absorption bands to be approximately separated.抄録全体を表示PDF形式でダウンロード (697K) -
森永 智昭, 山本 圭治郎, 倉石 達夫1971 年 7 巻 3 号 p. 239-246
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーVisualization of gas flow is a very important technique for the study of fluidic elements, but it is far more difficult than the visualization of liquid flow. Except some impractical optical methods, most methods for gas flow visualization utilize some tracer in the flow, and in most cases the tracer undesirably changes the flow characteristics. It is desirable, therefore, that the tracer and the operating gas possess the closest resemblance in their flow characteristics.
Ozone absorbs very strongly the ultraviolet radiation of 200 to 300 millimicron wavelength. Therefore, by illuminating a fluorescent plate with parallel ultraviolet radiation through the gas flow, the flow containing ozone can be visualized as a dark silhouette on the plate. The visualization technique based upon this principle was applied to the wall attachment fluidic elements, and it was revealed that the amount of ozone necessary to visualize the air flow is so small that it can hardly affect the flow characteristics. It is also possible to observe the transient state of the flow by adding ozone intermittently into the flow.抄録全体を表示PDF形式でダウンロード (3060K) -
1971 年 7 巻 3 号 p. 246
発行日: 1971年
公開日: 2009/03/27
ジャーナル フリーPDF形式でダウンロード (97K) -
守山 喜代松1971 年 7 巻 3 号 p. 247-253
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーThis paper describes a new astatic type automatic phase control (APC) system for a voltage-controlled crystal oscillator (VCXO). The control voltage is obtained by comparing the phase of the VCXO with that of a standard frequency oscillator operating at 40kHz. The signals from the two oscillators are supplied to a comparison circuit and the phase difference between them establishes the gate time. An auxiliary pulse generator feeds a signal to the gate circuit. The number of pulses passing through the gate is counted by a counting circuit and converted into an analog voltage which controls the VCXO.
The author has experimented with this APC system and has measured the frequency instability to be within 1.1X10-10/hour to the 40kHz frequency standard.抄録全体を表示PDF形式でダウンロード (812K) -
西部 邦彦, 正司 和彦, 藤井 克彦1971 年 7 巻 3 号 p. 254-262
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーThis paper deals with the boundedness of the solution of time-varying nonlinear feedback control systems with a piecewise continuous nonlinearity. It is shown in the theorems that, if both the input of the system and its first derivative are bounded, and if the system satisfies an extended asymptotic stability condition in the large, then the solution is also bounded. In addition, the upper bound of the solution is given by a function of the time, the maximum input amplitude, the system parameters, the initial conditions, etc.. Examples show that the presented theorems are applicable to a wider class of systems and that the theorems provide better results than those proposed in references.抄録全体を表示PDF形式でダウンロード (1069K) -
山本 有恒, 笹井 均1971 年 7 巻 3 号 p. 263-267
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーA computational algorithm is suggested in this paper to solve optimal control problems for linear lumped paramter systems with inequality constraints.
A penalty function is introduced, taking into account the inequality constraints and the system dynamics, so as to obtain the solutions of optimal control problems without explicitly solving the system dynamic equations.
Since the dynamic equations are regarded as equality constraints, the introduced penalty function is static and non-dynamic.
It is shown that this penalty function attains the minimum where the gradient is zero, and that the optimum of the original constrained problem is approached sequentially by solving unconstrained and non-dynamic new problems, each of which has a solution interior to the constraint set.抄録全体を表示PDF形式でダウンロード (538K) -
岩井 善太, 井上 昭1971 年 7 巻 3 号 p. 268-275
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーIn the design of feedback control systems, the values of all the state-variables are necessary at each time to form a feedback control law. Unfortunately, in many situations, all state-variables are not available by direct measurement. So, it is necessary to construct estimates of some state-variables from the outputs available by direct measurement. If the system is linear, its state vector can be approximately reconstructed by building an observer which is itself a linear system driven by the available outputs and inputs of the plant.
For time-invariant systems, such an observer is defined by D.G. Luenberger, and for time-variant systems by W.A. Wolovich as an exponential estimator. But this exponential estimator is not effective for some time-invariant systems.
In this paper, it is aimed to define an observer which is effective both for time-invariant systems and time-variant systems. At first is given the definition of compatibility of observers to plants, and next are discussed the necessary condition and the sufficient condition for compatibility. Especially, in the case of time-invariant systems, a necessary and sufficient condition exists. Finally is given the construction of observers for time-variant systems with one output.抄録全体を表示PDF形式でダウンロード (928K) -
青木 洋一1971 年 7 巻 3 号 p. 276-283
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーThis paper gives the way to determine the optimal control on a tracking problem for plants with known weighting functions. In the tracking problem, the input function of time u(t) (t0≤t≤tf), where t0, tf are the starting-up time and the final time of control respectively, is so chosen that the output of the plant should exactly ‘track’ the specified time function over the time interval [t1, tf], where t1 is a specified time in (t0, tf), and at the same time the total input energy is kept minimum. The equation expressing the constraint is transformed into a Volterra's integral equation of the second kind which facilitates the solution of the problem. Then the problem is formulated and solved in the framework of the function space approach.
Further, considering the fact that it is not easy to get optimal inputs in an analytic form in general, a computational algotithm which gives inputs sufficiently near to the optimal ones is presented. The proposed method gives approximate optimal inputs by matrix manipulations which are suited for digital computers. Several computed results are presented to illustrate the validity of the method.抄録全体を表示PDF形式でダウンロード (913K) -
熊丸 耕介1971 年 7 巻 3 号 p. 284-293
発行日: 1971/06/30
公開日: 2009/03/27
ジャーナル フリーIn this paper, an identification problem of unknown nonlinear discrete systems is considered from the standpoint of the local estimation of system dynamics and the global function learning.
In the local estimation process, the unknown nonlinear dynamics are expanded into the second order Taylor series about the estimated state and the expansion coefficients are estimated with the system state by using Second Order Filter on the assumption of a slow system variation. After the local estimation has been performed in the wide region of the states, these estimation results are used for the global learning of the unknown nonlinear functions which indicate the state transfer characteristics. In the function learning process, these unknown nonlinear functions in the system are approximated by the linear combination of the independent functions with unknown coefficients and the function learning can be reduced to the linear estimation of these unknown coefficients in which Kalman Filter is directly applicable.
It has been found that by using this method the computing time required for the identification can be remarkably reduced comparing with the usual method using the nonlinear parameter estimation.
Another identification method is also proposed here. In this method, the local estimation of the system dynamics and the global function learning are practiced in parallel, by driving the system to the optimal searching point at which the most effective information for the learning may be obtained.
As identification examples, four types of the nonlinear systems i.e. the saturation, periodic, exponential and polynominal types are considered by the digital computer simulations.抄録全体を表示PDF形式でダウンロード (1340K)
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