A method determines a wrapping configuration of a film wrapped around products to form a palletized load to be moved along a path. The method includes using a defined wrapping configuration, measuring physical quantities acting on the load as a result of movements and/or stresses when the load is moved along different test paths, obtaining a path as a suitable composition of base elementary path stretches, obtaining physical quantities acting on the load along the path as physical quantities associated to the base elementary path stretches, positioning the load on a motion platform, operating the motion platform based on the physical quantities to simulate movements and/or stresses acting on the load moved along the path, checking if the load has remained stable and/or compact, modifying the wrapping configuration if the load did not remain stable and/or compact, and repeating the steps.

A method determines a wrapping configuration of a film wrapped around products to form a palletized load to be moved along a path. The method includes using a defined wrapping configuration, measuring physical quantities acting on the load as a result of movements and/or stresses when the load is moved along different test paths, obtaining a path as a suitable composition of base elementary path stretches, obtaining physical quantities acting on the load along the path as physical quantities associated to the base elementary path stretches, positioning the load on a motion platform, operating the motion platform based on the physical quantities to simulate movements and/or stresses acting on the load moved along the path, checking if the load has remained stable and/or compact, modifying the wrapping configuration if the load did not remain stable and/or compact, and repeating the steps.

Provided is a method and an arrangement of fatigue testing of a wind turbine rotor blade, the method including: operating an actuator attached to the rotor blade, thereby moving a mass connected to the actuator in a reciprocating manner. The mass may be a hanging mass, for example, hanging down from the actuator.

An elastic material vibration test apparatus includes a lower support plate having an upper surface on which an elastic material to be tested is placed, an upper support plate disposed above the lower support plate to be spaced apart from the lower support plate, a pillar connecting the lower support plate and the upper support plate, a pressing rod configured to pass through the upper support plate and ascend and descend in a vertical direction, an air bearing installed on the upper support plate and supporting an outer surface of the pressing rod in a non-contact state, a pressing plate coupled to a lower end of the pressing rod to press an upper surface of the elastic material, and one or more weights coupled to the pressing rod above the air bearing.

An elastic material vibration test apparatus includes a lower support plate having an upper surface on which an elastic material to be tested is placed, an upper support plate disposed above the lower support plate to be spaced apart from the lower support plate, a pillar connecting the lower support plate and the upper support plate, a pressing rod configured to pass through the upper support plate and ascend and descend in a vertical direction, an air bearing installed on the upper support plate and supporting an outer surface of the pressing rod in a non-contact state, a pressing plate coupled to a lower end of the pressing rod to press an upper surface of the elastic material, and one or more weights coupled to the pressing rod above the air bearing.

A site effect simulator, including a site effect simulator base plate, where counter-force pillars are vertically arranged at diagonals of the site effect simulator base plate, the counter-force walls are connected to counter-force pillars along two sides of the site effect simulator base plate, a plurality of single-layer soil boxes are arranged at the inner side of the site effect simulator base plate, wave-absorbing materials are arranged inside single-layer soil boxes, and sliding panels are arranged at an upper side and a lower side of each single-layer soil box. The present disclosure does not need to rely on other counter-force frames, has the characteristics of flexible use, and can be randomly placed, and the height can be adjusted randomly. With a servo hydraulic actuator with three directions and six degrees of freedom, seismic simulation tests can be realized independently.

A site effect simulator, including a site effect simulator base plate, where counter-force pillars are vertically arranged at diagonals of the site effect simulator base plate, the counter-force walls are connected to counter-force pillars along two sides of the site effect simulator base plate, a plurality of single-layer soil boxes are arranged at the inner side of the site effect simulator base plate, wave-absorbing materials are arranged inside single-layer soil boxes, and sliding panels are arranged at an upper side and a lower side of each single-layer soil box. The present disclosure does not need to rely on other counter-force frames, has the characteristics of flexible use, and can be randomly placed, and the height can be adjusted randomly. With a servo hydraulic actuator with three directions and six degrees of freedom, seismic simulation tests can be realized independently.

A linear actuator, comprising: a base; a fixed part support mechanism attached to the base; a fixed part elastically supported by the fixed part support mechanism; and a movable part driven to reciprocate in a predetermined drive direction with respect to the fixed part, wherein the fixed part support mechanism comprises: a movable block attached to the fixed part; a linear guide that couples the movable block with the base to be slidable in the predetermined drive direction; and an elastic member that is disposed between the base and the movable block and prevents transmission of a high frequency component of vibration in the predetermined drive direction.

A linear actuator, comprising: a base; a fixed part support mechanism attached to the base; a fixed part elastically supported by the fixed part support mechanism; and a movable part driven to reciprocate in a predetermined drive direction with respect to the fixed part, wherein the fixed part support mechanism comprises: a movable block attached to the fixed part; a linear guide that couples the movable block with the base to be slidable in the predetermined drive direction; and an elastic member that is disposed between the base and the movable block and prevents transmission of a high frequency component of vibration in the predetermined drive direction.

A device for moving an object comprises a base and a platform able to receive the object; six supports each having an upper end connected to the platform and a lower end connected to the base and an actuation device connected to at least three of the supports. The upper end and lower end of each support in combination have at least five degrees of freedom. The actuation device is suited for giving predefined periodic movements to said at least three of the six supports, these three supports being called controlled supports, thus giving a periodic movement to the platform relative to the base with at least three degrees of freedom.