No abstract

Shallow seismic exploration is the unique approach to obtain first-hand data of engineering geology for municipal construction. In this work, a mechanical shocking source has been designed for facilitating exploration of constructive stratum datum of urban construction. Aiming at the existing issues of three commonly used artificial seismic sources, this device is expected to meet three requirements: (i) Sufficient impact force to guarantee the credibility of the received signal. In view of weak impact energy of sledge hammer, we regulated the compression spring number and elastic coefficient for favorable excitation energy. (ii) Convenience and efficiency. In view of complex structure and expensive price of vibroseis, we adopted a simple and reliable system design to ensure a convenient operation. (iii) Safety and pollution-free. Impact hammer impacts stressed plate under the spring force and its own gravity, so as to avoid unsafe explosion and environmental pollution caused by the sharp chemical reactions.

Abstract-Hydraulic maintenance vehicle for aviation is a critical ground device to ensure the flight safety and the provision of hydraulic oil. A novel multi-functional vehicle for aerial hydraulic maintenance is designed for proposing a maintenance approach for modern aircraft. Aiming at issues of existing ground maintenance devices, this work attempts to meet three design requirements as follows: (i) All purpose in one vehicle. This design offers a solution integrating fueling, pressure supplying and cleaning in one vehicle, so as to overcome single function issue of the existing devices. (ii) Active hydraulic oil purification. A high-speed centrifugal separation method has been employed to dealing with low efficiency and easy pollution of existing passive oil purification. (iii) Good motility. Aiming at two issues of large occupation and frequent operation transformation, the hydraulic system, power system, control system and auxiliary mechanism are installed on a drag-and-drop vehicle body to share a compact structure, flexible mobility, and convenient operation.