Abstract: The present invention discloses a testing system and a testing method for a structure which tests a structure made of a test piece structure and a numerical model virtually connected to the structure. A simulated structure including a frame, an actuator and a reaction force measuring device is mounted on a foundation on which a shaking table is also mounted. Only the test piece structure is mounted on the shaking table. The motion of the shaking table 5 which is generated at the time of shaking the test piece structure using the shaking table and the actuator is measured by a shaking table motion measuring device, while the reaction force generated by the test piece structure is measured by a reaction force measuring device. Using these measured values and the numerical model stored in a digital computer, the motion of the test piece structure after a predetermined period for the motion of the simulated structure is calculated.

Abstract: Provided is a vehicle testing apparatus which involves load variation and alignment variation, for analyzing a maneuverability of a vehicle on flat belts or rollers adapted to be rotated together with wheels of the vehicle, and in particular, maneuver variation. Load variation caused by an inertia force and a gravitational force which are produced during actual running of the vehicle, and tire alignment variation caused by suspension strokes, are forcibly reproduced by forces produced by actuators or a gravitational force, thereby it is possible to evaluate a maneuverability of the vehicle in a condition substantially the same as that during actual running of the vehicle.

Abstract: The present invention discloses a testing system and a testing method for a structure which tests a structure made of a test piece structure and a numerical model virtually connected to the structure. A simulated structure including a frame, an actuator and a reaction force measuring device is mounted on a foundation on which a shaking table is also mounted. Only the test piece structure is mounted on the shaking table. The motion of the shaking table 5 which is generated at the time of shaking the test piece structure using the shaking table and the actuator is measured by a shaking table motion measuring device, while the reaction force generated by the test piece structure is measured by a reaction force measuring device. Using these measured values and the numerical model stored in a digital computer, the motion of the test piece structure after a predetermined period for the motion of the simulated structure is calculated.

Abstract: A calculating device and method provided for a shaking test apparatus for carrying out a shaking test on a structure by using a partial structure and a numerical model which is virtually connected to the partial structure. The calculating device includes a calculation part which identifies a vibration model corresponding to the partial structure on the basis of displacement and reaction force detected in response to shaking and which combines the vibration model and the numerical model with each other to construct a model of the overall system corresponding to the structure and calculates the shaking response of the overall system model.

Abstract: Vibration excitation testing, e.g. a prototype or actual model, calculates a vibration response of a structure deforming in both of a translational direction and a rotational direction.

Abstract: A shaking response is estimated with high precision by performing a shaking test f or combining and estimating a shaking characteristic of a partial structure of an object under test obtained through a shaking test and a shaking response of the whole structure which is numerically modeled. In a shaking test apparatus and method, a structure under test comprises a partial structure and a numerical model which is virtually connected to the partial structure. First, a vibration model corresponding to the partial structure is assumed, the numerical model and the vibration model are combined to construct an overall-system model, and then the vibration response of the overall-system model is calculated. On the basis of the calculation result and the signal input from a waveform oscillator, the partial structure is shaken by using a shaker.

Abstract: Measured values obtained from a running test of an object to be tested and a module on a test bench such as a flat belt type chassis dynamo, and computation based upon numerical models of components other than the object to be tested and the module, are related to each other so as to reproduce a condition near to an actual running condition, for the object to be tested and the module so as to precisely analyze how the object to be tested and the module affects upon the motion of the overall vehicle during actual running of the vehicle. Thus it is possible to evaluate dynamic characteristics of respective vehicle components and a module which relate to the maneuvering performance of the vehicle, on a test bench in a condition in which a load variation and an alignment variation are taken into consideration.

Abstract: A simulation apparatus for simulating vehicle movement during actual running has a mock vehicle that is provided with a truck and a vibrator, and a numerical model that is virtually connected to the mock vehicle and stored in a digital computer. Wheels are joined to the bottom portion of the truck, and a driving machine for rotationally driving the wheels is provided under the wheels. The driving machine drives the wheels in such a manner as to simulate a running surface such as a road or rails. The rotation of the wheels causes the truck to generate reaction force. A reaction force measuring device measures this reaction force. Based on a resulting measurement value and the numerical model stored in the digital computer, the digital computer calculates a vehicle movement after a lapse of a preset time. A controller controls the vibrator so as to realize the calculated vehicle movement.

Abstract: A shaking table has a control unit for controlling the shaking table so that a target waveform signal is reproduced with at least an acceleration measuring signal as a feedback signal. The control unit is adapted for effecting control by employing the force applied to the shaking table from a specimen under test loaded on the shaking table as the feedback signal. As a control error deriving from the force is canceled, highly accurate acceleration reproducibility is attainable even in the case of a non-linear specimen under test whose dynamic characteristics fluctuate with time.

Abstract: A vehicle testing system for simulating a vehicular motion and vehicular vibration caused thereby is provided to test a front or rear wheel section of a four-wheel vehicle. The testing system comprises a vehicle suspension system, a wheel attached thereto, a first actuator for exciting the wheel based on data concerning road and other conditions, and a dummy vehicle body linked to the suspension system and having a frame, a reaction measuring device linked to the frame and a second actuator for exciting the frame. When the wheel is excited corresponding to the data on road and other conditions, the suspension system and the dummy body vibrate. The reaction force generated by the suspension system is measured by the reaction measuring device.

Abstract: A shaking test system for testing a structure including a shaking device for shaking the structure, measuring devices mounted on the shaking device for shaking the structure, external signal input device for inputting data indicative of external force for shaking the structure, as well as other calculating arrangements. The shaking test system permits the setting of a large time interval of a shaking test by converting natural modes of vibration expressed by a second-order differential equation, namely second-order lag system of a vibration differential equation into a first-order lag system or (O)th order lag system for short period mode.

Abstract: In place of a controlled object structure, a reaction force simulating actuator is connected to an actuator controlling the structure for recording a displacement at the connecting point. A reaction force at the connecting point after a given period of time is calculated by a digital computer on the basis of the measured value of the displacement and so forth and a known external force. The reaction force simulating actuator is actuated to realize the reaction force calculated value after the given period of time. Accordingly, since a load substantially corresponding to the reaction force from the controlled object structure is provided to a drive device, a test of the controlling drive device to be used in a condition difficult to realize can be performed under substantially similar conditions as in actual usage.

Abstract: A vibration testing system is economical and has high precision in realizing an equivalent test condition for testing for an entire structure, by employing a partial model by coupling testing of a partial structure and analysis of a numerical model with respect to a large structure or a structure having a portion that is difficult to establish the numerical model. In the vibration test using an actuator, a reaction of the member of the structure is detected to derive a vibration response after a given period of time at a boundary between the numerical model and the member. Excitation is performed so that the response of the actuator after the given period becomes consistent with a calculated value to make it possible to apply the response calculated with respect to the numerical model to the member by the actuator at the same timing to the actually occurring timing.