A vibratory compactor is provided. The vibratory compactor may include a frame coupled to a compactor plate. The frame and compactor plate are configured to vibrate to compact soil. The vibratory compactor may also include a housing having an inner volume, the housing coupled to the frame by at least one isolator with the frame and the at least one load bearing member located within the inner volume. The housing may be coupled to an arm of an excavator. A gap may be formed between the housing and the frame, wherein the gap between the housing and the frame inhibits movement of the housing with respect to the frame through the housing contacting the frame when excess forces are applied to the housing in an up/down direction, a forward/backward direction, a side-to-side direction, or combinations thereof.

A pneumatic vibration device with a rotatable piston shaft comprises a piston body and a gas diverter. The piston body comprises a piston shaft, an input shaft and a piston cylinder body. The piston shaft comprises a hollow spindle with two ends connected to a first piston and a second piston through connection bearings respectively. The first piston and the second piston are connected through an inner sleeve. The spindle is connected to a rotary connection member. The input shaft stretches into the inner sleeve and is matched and connected with the rotary connection member. The gas diverter comprises a first gas diversion port and a second diversion port. The pneumatic vibration device is compact in structure and high in adaptability, and can realize rotation and vibration of drilling tools.

Disclosed are a control method for a road roller machine, and a road roller machine. The control method includes: turning up, in response to a request of starting vibration, a revolving speed of an engine until the revolving speed exceeds a preset revolving speed range and turning down a displacement of a driving pump; starting a vibration pump; judging whether a vibration assembly has completed a vibration start; turning down, after the vibration start is completed, the revolving speed of the engine to be within the preset revolving speed range, turning up the displacement of the driving pump, and turning up a displacement of the vibration pump. The road roller machine includes a main body, an engine, a driving assembly, a driving pump, a vibration pump, a vibration assembly and a controller.

A vibratory compactor is provided. The vibratory compactor may include a frame coupled to a compactor plate. The frame and compactor plate are configured to vibrate to compact soil. The vibratory compactor may also include a housing having an inner volume, the housing coupled to the frame by at least one isolator with the frame and the at least one load bearing member located within the inner volume. The housing may be coupled to an arm of an excavator. A gap may be formed between the housing and the frame, wherein the gap between the housing and the frame inhibits movement of the housing with respect to the frame through the housing contacting the frame when excess forces are applied to the housing in an up/down direction, a forward/backward direction, a side-to-side direction, or combinations thereof.

A hybrid shaker system comprises two subsystems: a hydraulic shaker that generates vibrational movement mainly in a low frequency range, and an electrodynamic (ED) shaker that generates vibrations mainly in a high frequency range, with both contributing within a transitional intermediate frequency range. The shaker subsystems are connected in series so that cylinder piston rods of the hydraulic system drive the ED shaker housing, which in turn vibrates a unit-under-test (UUT). A single integrated vibration controller controls both the servo system of the hydraulic system and the power amplifier of the ED shaker using comparison of a target vibration profile with sensor feedback from the ED shaker housing and UUT. Vibrational movement of the UUT over a complete frequency range up to a few thousand kilohertz can be covered, while providing very large displacements up to 25 centimeters during the same test.