A support apparatus for a modal test and a using method thereof. The support apparatus includes: a suspension structure (1) configured to suspend a test unit (2); and a support structure disposed under the suspension structure (1) and configured to support the test unit (2). The suspension structure (1) and the support structure are matched to cause a stiffness of the support apparatus for a modal test to be zero. The support structure includes an anti-stiffness rhombus-shaped frame (4), a scalable sleeve, a horizontal elastic component (49), and a base (6). The scalable sleeve is connected to the anti-stiffness rhombus-shaped frame (4) and the base (6) respectively, and the horizontal elastic component (49) connects two diagonal points of the anti-stiffness rhombus-shaped frame (4).

A test apparatus includes a vibratory body that shakes a device under testing (DUT), a pedestal dedicated to support the DUT and disposed on the vibratory body, and a clamping mechanism operative to selectively clamp the pedestal to the vibratory body and release the pedestal from the vibratory body. The vibratory body and the pedestal define a cavity in which the clamping mechanism is disposed. The clamping mechanism includes a clamp ring and at least one locking element carried by the clamp ring so as to be displaceable in a radial direction relative to the clamp ring, at least one tang facing the at least one locking element in the radial direction, and a piston slidable in an axial direction relative to the clamp ring between a first position at which the pedestal is free from vibratory body and a second position at which the locking element is compressed between the piston and the tang.

An electrodynamic vibration testing system for shaking a specimen comprises a fixed section, a movable section which can reciprocate in a predetermined direction with respect to the fixed section, a voice coil motor for driving the movable section, a table attached to the movable section for fixing the specimen, an air spring which supports the movable section to the fixed section from below, and a reaction plate attached to the fixed section for sandwiching the specimen between the table, and the reaction plate.

An apparatus for inspecting filled containers for foreign bodies that may be contained therein, where the filled container is mechanically excited by vibration or rotation so as to cause the possibly existing foreign bodies to rotate. The acoustic signals produced by the foreign bodies impacting on the inner wall of the container are detected and analyzed. Any signal detection is separated from mechanical excitation, and mechanical excitation is separated from container transport in that the signal-detecting sensor is applied to the container only after the end of the mechanical excitation. The mechanical excitation is executed by an excitation element that is brought into contact with the container independently of the holding elements used for the purpose of transport.

An apparatus for inspecting filled containers for foreign bodies that may be contained therein, where the filled container is mechanically excited by vibration or rotation so as to cause the possibly existing foreign bodies to rotate. The acoustic signals produced by the foreign bodies impacting on the inner wall of the container are detected and analyzed. Any signal detection is separated from mechanical excitation, and mechanical excitation is separated from container transport in that the signal-detecting sensor is applied to the container only after the end of the mechanical excitation. The mechanical excitation is executed by an excitation element that is brought into contact with the container independently of the holding elements used for the purpose of transport.

A device for applying vibrations to passenger cars has a platform with a roller on which a front or rear pair of wheels of the passenger car can be positioned. The roller has for each wheel positioned thereon at least two tracks with a different relief. In a first position the passenger car is located with the wheels on a first pair of the tracks and in a second position is located with the wheels on another pair of the tracks so that by rotating the rollers under the wheels vibrations are applied to the passenger car by the relief of the roller. Each track has a width greater than a greatest of the different wheel widths. There is a distance between each of the first and second pair of the tracks which is substantially equal to a greatest of the different track widths.

A method of diagnosing a valve is described, which has an electrodynamic actuator, which includes a coil, a movable magnet arrangement for generating a magnetic field, and a movable control element which is coupled to the movably arranged magnet arrangement. At least one electrical variable of the electrodynamic actuator is measured. The electrical variable is evaluated with respect to a reference variable to determine at least one induction-dependent valve variable which is assigned to the motion profile of the electrodynamic actuator. A diagnosis module and a valve are furthermore described.

A method of diagnosing a valve is described, which has an electrodynamic actuator, which includes a coil, a movable magnet arrangement for generating a magnetic field, and a movable control element which is coupled to the movably arranged magnet arrangement. At least one electrical variable of the electrodynamic actuator is measured. The electrical variable is evaluated with respect to a reference variable to determine at least one induction-dependent valve variable which is assigned to the motion profile of the electrodynamic actuator. A diagnosis module and a valve are furthermore described.

A vibration exciter with load compensation for the dynamic excitation of test specimens includes a base, an actuator, an armature which can be moved by the actuator in an excitation direction relative to the base and guided by a linear guiding element parallel to the excitation direction, and a pneumatic load compensator which compensates for the gravity force of at least the armature and the test specimen being excited. A high-quality low-perturbation exciter signal is generated by minimizing friction and other nonlinearities occurring during the load compensation. The linear guiding element of the vibration exciter with load compensation includes an air bearing, and the load compensator includes the linear guiding element.

The invention relates to a mechanical testing device with at least one load frame, which has a frame part and a clamping device held therein, in which a beam-shaped test specimen, in particular a rotor blade or rotor blade segment, can be clamped projecting through the load frame, the load frame being mounted in a first pivot bearing arrangement on a carrier frame or a support frame so as to be rotatable about a first transverse axis of the test specimen which extends perpendicularly to its longitudinal axis projecting through the clamping device, wherein the frame part has a four-fold rotational symmetry, in particular a square shape, or an annular shape. The design of the load frame(s) results in easy rotatability/adjustability of the test specimen. In a method for carrying out the test, the system natural frequencies in different loading directions can be suitably matched.