human response to vibration
its been a while...hmmm i have to go somewhere very soon but i want to leave something here at least when i get back to this post, it could help me what i originally want to write about...
Progress has been down for few days...excuse : "managing the household" ;)
well...i read a topic on human response to vibration prepared by J.B.Morrison. I think it must be lecture notes for the undergraduates. human body is described as a complex mechanical system which consist of visco-elastic elements (reminds me of elastigirl). So as any mechanical system, it will give dynamic response to an externally imposed vibratory force. The response is affected by these factors;1. nature of the forcing vibration (i.e. frequency, amplitude and point of application),2. mechanical constants of the mech. system (i.e. body composition e.g. weight, tissue distribution, mass of organs, elastic and viscous properties of connective tissue), 3. the configuration (i.e. standing, sitting posture) and 4. the point at which the response of the system is measured (e.g. pelvis, head, hand).
Each element (organ) has its own natural or resonant frequency of vibration).So at different forcing frequencies, different element may be more or less affected...i.e. more prone to damage, pain, impaired performance or discomfort. The effects can be whole body vibration or segmental. The latter category transmits vibrations throughout the body e.g. car seat. The second category does not transmit significant acceleration or displacement to body segments beyond the certain element affected e.g. chain saw affects only the hand-arm complex system. Effcets can be categorized into mechanical e.g. tissue damage, physiological e.g. stress, increased cardiac output or psychological e.g. annoyance and impaired concentration.
.................what???? my computer logged off on its own? i've almost finish...something on system with damping ratio or fraction of critical damping, apparent mass which is measurement of the apparent mass at the seat divided by the acceleration of gravity in response to vertical vibration.
Anyway its 2nd Ramadhan 1427...not too late to wish all muslim out there happy fasting and do helluva good deeds people!!!Ciao.
Progress has been down for few days...excuse : "managing the household" ;)
well...i read a topic on human response to vibration prepared by J.B.Morrison. I think it must be lecture notes for the undergraduates. human body is described as a complex mechanical system which consist of visco-elastic elements (reminds me of elastigirl). So as any mechanical system, it will give dynamic response to an externally imposed vibratory force. The response is affected by these factors;1. nature of the forcing vibration (i.e. frequency, amplitude and point of application),2. mechanical constants of the mech. system (i.e. body composition e.g. weight, tissue distribution, mass of organs, elastic and viscous properties of connective tissue), 3. the configuration (i.e. standing, sitting posture) and 4. the point at which the response of the system is measured (e.g. pelvis, head, hand).
Each element (organ) has its own natural or resonant frequency of vibration).So at different forcing frequencies, different element may be more or less affected...i.e. more prone to damage, pain, impaired performance or discomfort. The effects can be whole body vibration or segmental. The latter category transmits vibrations throughout the body e.g. car seat. The second category does not transmit significant acceleration or displacement to body segments beyond the certain element affected e.g. chain saw affects only the hand-arm complex system. Effcets can be categorized into mechanical e.g. tissue damage, physiological e.g. stress, increased cardiac output or psychological e.g. annoyance and impaired concentration.
.................what???? my computer logged off on its own? i've almost finish...something on system with damping ratio or fraction of critical damping, apparent mass which is measurement of the apparent mass at the seat divided by the acceleration of gravity in response to vertical vibration.
Anyway its 2nd Ramadhan 1427...not too late to wish all muslim out there happy fasting and do helluva good deeds people!!!Ciao.
Comments
been doing some blog-hopping. ni nak elak dari tertido bila baca all the technical articles. u r doing your phd? in what area? how did you settle on your phd topic? sounds really canggih manggih ..
currently in the mist or finding a research topic ... pennniiiinng ..
what u like most
who do you like to have as a supervisor
what his expertise
and maybe requirement from your faculty...
maybe you want to indulge in this book first (or you may have heard or read it...always good to refresh if you have) How to get a phD, a handbook for students and their supervisors by Phillips and Pugh.
PTSL have few copies and 1 is still with me. To purchase is VERY expensive.
You make it sound soo easy :) I guess my prob is finding what I like most ... something that I can stick with for the next 3-4 years.
well you tell me..even now i'm still walking in the dark. you will never be sure i guess...as a researcher it is not the end or the final but merely a beginning as a professional researcher.
haha .. your latest post is scaring me further... 400 papers to read?! wow...
well, guess no more .. I am with mmu and just finished invigilating and that is the boring-est job ever!