Osaka Sangyo University Repository / 大阪産業大学リポジトリ
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About the Sound of Stepping on Security Gravel
Full text link防犯対策として，庭に砂利を敷くことが多い。ホームセンターなどでは，一般の砂利のほかに防犯砂利と名付けられた砂利が販売されている。防犯砂利と一般砂利の違いは石の大きさや人が石を踏むと大きな音が発生することである。本報告では２種類の一般砂利と２種類の防犯砂利を踏みしめた時に発生する音の違いを中心に検討した。departmental bulletin pape
In Search at Lost Sound and Voices（ Part 2: About the Five Colors of Voice）
Full text link式亭三馬の浮世風呂に掲載されている「五色の声」と呼ばれる声のうち，「黄色い声」と「白声」だけを残して，他は使われなくなってしまった声をここで推測する。江戸時代は現在と異なり，各家庭で風呂を持つことが少なく，皆で銭湯に行くことが普通であり，しかも混浴であった。このような条件の下で浮世風呂の世界にどっぷりとつかりながら，「五色の声」とはどんな声だったのか取り組んだ。なお，「黄色い声」と「白声」以外の３つの声については現在まで伝わっていない。departmental bulletin pape
A Dynamic Analysis of Railway Vehicles Using the Roller Rig Model
Full text linkVibration and acceleration of a vehicle are mainly generated by wheels and bogies when
running on rails, and are transmitted to the vehicle body. In particular, when hunting
occurs during high-speed running, there is a danger of derailment, which adversely affects the comfort of the vehicle.
The main factors in examining the vibration that largely influences the riding comfort include the motion of motors and engines, the irregularity of rails, the impact when passing through turnouts, the aerodynamic vibration when running at high speed in tunnels, and earthquakes. In addition, the vibration environment includes wheels and rails, which cause the hunting as the response characteristics, the vibration and sway of the vehicle body,and the natural vibration. Vehicle motion analysis including all of these is a very important topic for safe running and improvement of riding comfort.
In this paper, the running of a railway vehicle is reproduced using a roller rig model that can run at very high speed, and the vehicle motion characteristics are verified focusing on the relationship between the hunting and the natural vibration. In particular, the relationship between the model test and the actual vehicle is verified by comparing with the running test results of the actual vehicle, and the suitability and effectiveness of the model rules that regulates the physical relationship between the roller rig model and the actual vehicle and the characteristics of the model are confirmed, and the vehicle motion is analyzed in more depth.departmental bulletin pape
